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high-voltage, high-current operational amplifier description the OPA547 is a low-cost, high-voltage/high-current opera- tional amplifier ideal for driving a wide variety of loads. a laser-trimmed monolithic integrated circuit provides excellent low-level signal accuracy and high output voltage and cur- rent. the OPA547 operates from either single or dual supplies for design flexibility. in single-supply operation, the input com- mon-mode range extends below ground. the OPA547 is internally protected against over-temperature conditions and current overloads. in addition, the OPA547 was designed to provide an accurate, user-selected current limit. unlike other designs which use a power resistor in series with the output current path, the OPA547 senses the load indirectly. this allows the current limit to be adjusted from 0ma to 750ma with a 0 to 150 a control signal. this is easily done with a resistor/potentiometer or controlled digi- tally with a voltage-out or current-out dac. the enable/status (e/s) pin provides two functions. an input on the pin not only disables the output stage to effectively disconnect the load, but also reduces the quiescent current to conserve power. the e/s pin output can be monitored to determine if the OPA547 is in thermal shutdown. the OPA547 is available in an industry-standard 7-lead staggered and straight lead to-220 package, and a 7-lead ddpak surface-mount plastic power package. the copper tab allows easy mounting to a heat sink or circuit board for excellent thermal performance. it is specified for operation over the extended industrial temperature range, C40 c to +85 c. features wide supply range single supply: +8v to +60v dual supply: 4v to 30v high output current: 500ma continuous wide output voltage swing fully protected: thermal shutdown adjustable current limit output disable control thermal shutdown indicator high slew rate: 6v/ s low quiescent current packages: 7-lead to-220, zip and straight leads 7-lead ddpak surface-mount applications valve, actuator drivers synchro, servo drivers power supplies test equipment transducer excitation audio amplifiers OPA547 v in C v in + v+ e/s r cl r cl sets the current limit value from 0 to 750ma. (0.25w signal resistor) i lim v o v C OPA547 sbos056c C january 2002 C july 2003 www.ti.com production data information is current as of publication date. products conform to specifications per the terms of texas instruments standard warranty. production processing does not necessarily include testing of all parameters. copyright ? 2002-2003, texas instruments incorporated please be aware that an important notice concerning availability, standard warranty, and use in critical applications of texas instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. o p a 5 4 7 o p a 5 4 7 o p a 5 4 7
OPA547 2 sbos056b www.ti.com absolute maximum ratings (1) output current ................................................................. see soa curve supply voltage, v+ to v C ................................................................... 60v input voltage .................................................. (v C ) C 0.5v to (v+) + 0.5v input shutdown voltage ........................................................................ v+ operating temperature .................................................. C 40 c to +125 c storage temperature ..................................................... C 55 c to +125 c junction temperature ...................................................................... 150 c lead temperature (soldering 10s) (2) .............................................. 300 c top front view pin configurations notes: (1) stresses above these ratings may cause permanent damage. (2) vapor-phase or ir reflow techniques are recommended for soldering the OPA547f surface-mount package. wave soldering is not recommended due to excessive thermal shock and shadowing of nearby devices. specified package temperature package ordering transport product package-lead designator (1) range marking number media, quantity OPA547t to-220-7 kvt C 40 c to +85 c OPA547t OPA547t tubes, 49 OPA547t-1 " kc "" OPA547t-1 tubes, 49 OPA547f ddpak-7 ktw C 40 c to +85 c OPA547f OPA547f tubes, 49 " """ OPA547f OPA547f/500 tape and reel, 500 note: (1) for the most current specifications and package information, refer to our web site at www.ti.com. package/ordering information electrostatic discharge sensitivity this integrated circuit can be damaged by esd. texas instru- ments recommends that all integrated circuits be handled with appropriate precautions. failure to observe proper handling and installation procedures can cause damage. esd damage can range from subtle performance degradation to complete device failure. precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. 7-lead straight-formed to-220 (t-1) note: tabs are electrically connected to the v C supply. i lim v C v o v+ v in C v in+ 1234 5 6 e/s 7 7-lead ddpak (fa) surface-mount i lim v C v o v+ v in C v in+ 1234 5 6 e/s 7 7-lead stagger-formed to-220 (t) i lim v C v o v+ v in C v in+ 1234 5 6 e/s 7
OPA547 3 sbos056b www.ti.com electrical characteristics at t case = +25 c, v s = 30v and e/s pin open, unless otherwise noted. OPA547t, f parameter condition min typ max units offset voltage input offset voltage v cm = 0, i o = 0 1 5mv vs temperature t a = C 40 c to +85 c 25 v/ c vs power supply v s = 4v to 30v 10 100 v/v input bias current (1) input bias current (2) v cm = 0v C 100 C 500 na vs temperature 0.5 na/ c input offset current v cm = 0v 5 50 na noise input voltage noise density, f = 1khz 90 nv/ hz current noise density, f = 1khz 200 fa/ hz input voltage range common-mode voltage range: positive linear operation (v+) C 3 (v+) C 2.3 v negative linear operation (v C ) C 0.1 (v C ) C 0.2 v common-mode rejection v cm = (v C ) C 0.1v to (v+) C 3v 80 95 db input impedance differential 10 7 || 6 ? || pf common-mode 10 9 || 4 ? || pf open-loop gain open-loop voltage gain, f = 10hz v o = 25v, r l = 1k ? 100 115 db v o = 25v, r l = 50 ? 110 db frequency response gain-bandwidth product r l = 50 ? 1 mhz slew rate g = 1, 50vp-p, r l = 50 ? 6v/ s full-power bandwidth see typical curve khz settling time: 0.1% g = C 10, 50v step 18 s total harmonic distortion + noise, f = 1khz r l = 50 ? , g = +3v, 1w power 0.004 (3) % output voltage output, positive i o = 0.5a (v+) C 2.2 (v+) C 1.9 v negative i o = C 0.5a (v C ) +1.6 (v C ) +1.3 v positive i o = 0.1a (v+) C 1.8 (v+) C 1.5 v negative i o = C 0.1a (v C ) +1.2 (v C ) +0.8 v maximum continuous current output: dc 500 ma ac 500 marms leakage current, output disabled, dc see typical curve output current limit current limit range 0 to 750 ma current limit equation i lim = (5000)(4.75)/(31600 ? + r cl )a current limit tolerance (1) r cl = 31.6k ? (i lim = 375ma), 10 30 ma r l = 50 ? capacitive load drive see typical curve (4) output enable /status (e/s) pin shutdown input mode v e/s high (output enabled) e/s pin open or forced high (v C ) +2.4 v v e/s low (output disabled) e/s pin forced low (v C ) +0.8 v i e/s high (output enabled) e/s pin high C 60 a i e/s low (output disabled) e/s pin low C 65 a output disable time 1 s output enable time 3ms thermal shutdown status output normal operation sourcing 20 a(v C ) +2.4 (v C ) +3.5 v thermally shutdown sinking 5 a, t j > 160 c(v C ) +0.35 (v C ) +0.8 v junction temperature, shutdown +160 c reset from shutdown +140 c power supply specified voltage 30 v operating voltage range 4 30 v quiescent current i lim connected to v C , i o = 0 10 15 ma quiescent current, shutdown mode i lim connected to v C 4ma temperature range specified range C 40 +85 c operating range C 40 +125 c storage range C 55 +125 c thermal resistance, jc 7-lead ddpak, 7-lead to-220 f > 50hz 2 c/w 7-lead ddpak, 7-lead to-220 dc 3 c/w thermal resistance, ja 7-lead ddpak, 7-lead to-220 no heat sink 65 c/w notes: (1) high-speed test at t j = +25 c. (2) positive conventional current flows into the input terminals. (3) see total harmonic distortion+noise in the typical characteristics section for additional power levels. (4) see small-signal overshoot vs load capacitance in the typical characteristics section.
OPA547 4 sbos056b www.ti.com typical characteristics at t case = +25 c, v s = 30v, and e/s pin open, unless otherwise noted. 1 10 100 1k 10k 100k 1m 10m 120 100 80 60 40 20 0 C 20 gain (db) 0 C 45 C 90 C 135 C 180 phase ( ) frequency (hz) open-loop gain and phase vs frequency r l = 50 ? g C 75 C 50 C 25 0 25 50 75 100 125 150 C 160 C 140 C 120 C 100 C 80 C 60 C 40 C 20 0 input bias current (na) temperature ( c) input bias current vs temperature i b v s = 5v v s = 30v C 75 C 50 C 25 0 25 50 75 100 125 150 600 500 400 300 200 100 current limit (ma) temperature ( c) current limit vs temperature r cl = 31.6k ? r cl = 63.4k ? r cl = 15.9k ? 0 5 10 15 20 25 30 600 550 500 450 +400 350 300 250 200 current limit (ma) supply voltage (v) current limit vs supply voltage r cl = 15.9k ? r cl = 31.6k ? r cl = 63.4k ? +i lim C i lim 1 10 100 1k 10k 100k 1m 400 300 200 100 0 voltage noise (nv/ hz) frequency (hz) voltage noise density vs frequency C 75 C 50 C 25 0 25 50 75 100 125 150 12 10 8 6 4 2 quiescent current (ma) temperature ( c) quiescent current vs temperature i q i q shutdown v s = 30v v s = 5v v s = 30v v s = 5v
OPA547 5 sbos056b www.ti.com typical characteristics (cont.) at t case = +25 c, v s = 30v, and e/s pin open, unless otherwise noted. 10 100 1k 10k 100k 1m 100 90 80 70 60 50 40 30 20 cmr (db) frequency (hz) common-mode rejection vs frequency 1 10 100 1k 10k 100k 1m 120 100 80 60 40 20 0 psr (db) frequency (hz) power supply rejection vs frequency +psrr C psrr 0 2k 4k 6k 8k 10k 12k 14k 16k 18k 20k 50 40 3 20 10 0 overshoot (%) load capacitance (pf) small-signal overshoot vs load capacitance g = C 1 g = +1 C 75 C 50 C 25 0 a ol 25 50 75 100 125 150 105 100 95 90 85 cmrr (db) 120 115 100 95 90 psrr, a ol (db) temperature ( c) open-loop gain, common-mode rejection, and power supply rejection vs temperature cmrr psrr C 75 C 50 C 25 0 25 50 75 100 125 150 1.25 1 0.75 0.5 0.25 0 7.5 7 6.5 6 5.5 5 gain-bandwidth product (mhz) slew rate (v/ s) temperature ( c) gain-bandwidth product and slew rate vs temperature sr+ sr C gbw 20 100 1k 10k 20k 0.1 0.01 0.001 0.0001 thd+n (%) frequency (hz) total harmonic distortion+noise vs frequency r l = 50 ? g = +3 0.1w 1w 6.25w
OPA547 6 sbos056b www.ti.com typical characteristics (cont.) at t case = +25 c, v s = 30v, and e/s pin open, unless otherwise noted. 0 100 200 300 400 500 600 3 2.5 2 1.5 1 0.5 0 ? ? C ? ? (v) output current (ma) output voltage swing vs output current (v+) C v o ? (v C ) C v o ? C 75 C 50 C 25 0 25 50 75 100 125 150 2.5 2 1.5 1 0.5 0 ? ? C ? ? (v) temperature ( c) output voltage swing vs temperature i o = +500ma i o = +100ma i o = C 500ma i o = C 100ma 1k 10k 100k 1m 30 25 20 15 10 5 0 output voltage (vp) frequency (hz) maximum output voltage swing vs frequency maximum output voltage without slew rate induced distortion C 40 C 30 C 20 C 10 0 10 20 30 1 0.5 0 C 0.5 C 1 leakage current (ma) output voltage (v) output leakage current vs applied output voltage r cl = 31.6k ? r cl = r cl = 0 r l = 10 ? v s = 30v output disabled v e/s < (v C ) + 0.8v offset voltage production distribution percent of amplifiers (%) offset voltage (mv) 20 18 16 14 12 10 8 6 4 2 0 typical production distribution of packaged units. C 5 C 4 C 2 C 3 C 1012345 offset voltage drift production distribution percent of amplifiers (%) offset voltage drift ( v/ c) 25 20 15 10 5 0 typical production distribution of packaged units. 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
OPA547 7 sbos056b www.ti.com 5 s/div large signal step response g = 3, c l = 100pf, r l = 50 ? small signal step response g = 3, c l = 1000pf typical characteristics (cont.) at t case = +25 c, v s = 35v, and e/s pin open, unless otherwise noted. 50mv/div 2 s/div 50mv/div 2 s/div 10v/div small signal step response g = 1, c l = 1000pf
OPA547 8 sbos056b www.ti.com applications information figure 1 shows the OPA547 connected as a basic noninverting amplifier. the OPA547 can be used in virtually any op amp configuration. power-supply terminals should be bypassed with low series impedance capacitors. the technique shown, using a ce- ramic and tantalum type in parallel is recommended. power- supply wiring should have low series impedance. g = 1+ r 2 r 1 z l e/s 3 7 5 4 2 1 6 r 2 i lim (1) r 1 0.1 f (2) 10 f OPA547 v C v+ + + v in 10 f 0.1 f (2) v o notes: (1) i lim connected to v C gives the maximum current limit, 750ma (peak). (2) connect 0.1 f capacitors directly to package power-supply pins. with the OPA547, the simplest method for adjusting the current limit uses a resistor or potentiometer connected between the i lim pin and v C according to the equation 1: r i k cl lim = ()(.) C . 5000 4 75 31 6 ? the low-level control signal (0 a to 150 a) also allows the current limit to be digitally controlled with a current-out or voltage-out dac reference to v C according to the equations given in figure 3. figure 3 shows a simplified schematic of the internal circuitry used to set the current limit. leaving the i lim pin open programs the output current to zero, while connecting i lim directly to v C programs the maximum output current limit, typically 750ma. safe operating area stress on the output transistors is determined both by the output current and by the output voltage across the conduct- ing output transistor, v s C v o . the power dissipated by the output transistor is equal to the product of the output current and the voltage across the conducting transistor, v s C v o . the safe operating area (soa curve, figure 2) shows the permissible range of voltage and current. figure 1. basic circuit connections. power supplies the OPA547 operates from single (+8v to +60v) or dual ( 4v to 30v) supplies with excellent performance. most behavior remains unchanged throughout the full operating voltage range. parameters which vary significantly with oper- ating voltage are shown in the typical characteristic curves. some applications do not require equal positive and negative output voltage swing. power-supply voltages do not need to be equal. the OPA547 can operate with as little as 8v between the supplies and with up to 60v between the supplies. for example, the positive supply could be set to 55v with the negative supply at C 5v, or vice-versa. adjustable current limit the OPA547 features an accurate, user-selected current limit. current limit is set from 0ma to 750ma by controlling the input to the i lim pin. unlike other designs which use a power resistor in series with the output current path, the OPA547 senses the load indirectly. this allows the current limit to be set with a 0 a to 150 a control signal. in contrast, other designs require a limiting resistor to handle the full output current (750ma in this case). 12 510 ? v s C v o ? (v) 20 50 100 safe operating area 1k 100 output current (ma) 10 current-limited t c = 25 c t c = 125 c t c = 85 c output current may be limited to less than 500ma see text. pulse operation only (<50% duty-cycle) figure 2. safe operating area. the safe output current decreases as v s C v o increases. output short-circuits are a very demanding case for soa. a short-circuit to ground forces the full power-supply voltage (v+ or v C ) across the conducting transistor. with t c = 25 c the maximum output current of 500ma can be achieved under most conditions. increasing the case temperature reduces the safe output current that can be tolerated without activating the thermal shutdown circuit of the OPA547. for further insight on soa, consult application bulletin sboa022. power dissipation power dissipation depends on power supply, signal, and load conditions. for dc signals, power dissipation is equal to the product of output current times the voltage across the con- (1)
OPA547 9 sbos056b www.ti.com ducting output transistor. power dissipation can be mini- mized by using the lowest possible power-supply voltage necessary to assure the required output voltage swing. for resistive loads, the maximum power dissipation occurs at a dc output voltage of one-half the power-supply voltage. dissipation with ac signals is lower. application bulletin sboa022 explains how to calculate or measure power dissipation with unusual signals and loads. heat sinking most applications require a heat sink to assure that the maximum junction temperature (150 c) is not exceeded. the heat sink required depends on the power dissipated and on ambient conditions. consult application bulletin sboa021 for information on determining heat sink requirements. the inter- nal protection circuitry was designed to protect against over- load conditions. it does not activate until the junction tempera- ture reaches approximately 160 c and was not intended to replace proper heat sinking. continuously running the OPA547 into thermal shutdown will degrade reliability. the tab of the ddpak surface-mount version should be soldered to a circuit board copper area for good heat dissi- pation. figure 4 shows typical thermal resistance from junc- tion to ambient as a function of the copper area. figure 4. thermal resistance versus circuit board copper area. thermal resistance vs circuit board copper area 50 40 30 20 10 0 thermal resistance, ja ( c/w) 012345 copper area (inches 2 ) OPA547f surface-mount package 1oz copper circuit board copper area OPA547 surface-mount package figure 3. adjustable current limit. 31.6k ? r cl 0.01 f (optional, for noisy environments) 3 4 3 4 4.75v g = 5000 r cl = C 31.6k ? OPA547 current limit: 0ma to 750ma note: (1) resistors are nearest standard 1% values. desired current limit 0ma 100ma 375ma 500ma 750ma resistor (1) (r cl ) i lim open 205k ? 31.6k ? 15.8k ? i lim shorted to v C current dac (i dac ) 0 a 20 a 75 a 100 a 150 a voltage dac (v dac ) (v C ) + 4.75v (v C ) + 4.12v (v C ) + 2.38v (v C ) + 1.59v (v C ) + 0.01v resistor method 5000 (4.75v) i lim v C v o 31.6k ? 4.75v g = 5000 i dac = i lim /5000 v dac = (v C ) + 4.75v C (31.6k ? ) (i lim )/5000 dac method (current or voltage) v C v o d/a
OPA547 10 sbos056b www.ti.com thermal protection the OPA547 has thermal shutdown that protects the ampli- fier from damage. activation of the thermal shutdown circuit during normal operation is an indication of excessive power dissipation or an inadequate heat sink. depending on load and signal conditions, the thermal protection circuit may cycle on and off. this limits the dissipation of the amplifier but may have an undesirable effect on the load. the thermal protection activates at a junction temperature of approximately 160 c. however, for reliable operation, junc- tion temperature should be limited to 150 c. to estimate the margin of safety in a complete design (including heat sink), increase the ambient temperature until the thermal protection is activated. use worst-case load and signal conditions. for good reliability, the thermal protection should trigger more than 35 c above the maximum expected ambient condition of the application. this produces a junction temperature of 125 c at the maximum expected ambient condition. enable/status (e/s) pin the enable/status pin provides two functions: forcing this pin low disables the output stage, or e/s can be monitored to determine if the OPA547 is in thermal shutdown. one or both of these functions can be utilized on the same device using single or dual supplies. for normal operation (output en- abled), the e/s pin can be left open or pulled high (at least +2.4v above the negative rail). output disable a unique feature of the OPA547 is its output disable capabil- ity. this function not only conserves power during idle peri- ods (quiescent current drops to approximately 4ma), but also allows multiplexing in low frequency (f<10khz), multichannel applications. signals that are greater than 10khz may cause leakage current to increase in devices that are shutdown. figure 15 shows the two OPA547s in a switched amplifier configuration. the on/off state of the two amplifiers is con- trolled by the voltage on the e/s pin. to disable the output, the e/s pin is pulled low, no greater than 0.8v above the negative rail. typically the output is shutdown in 1 s. figure 5 provides an example of how to implement this function using a single supply. figure 6 gives a circuit for dual- supply applications. to return the output to an enabled state, the e/s pin should be disconnected (open) or pulled to at least (v C ) + 2.4v. it should be noted that pulling the e/s pin high (output enabled) does not disable internal thermal shutdown. OPA547 v+ e/s v C note: (1) optional may be required to limit leakage current of optocoupler at high temperatures. (1) 6 1 1 4n38 optocoupler 5 4 hct or ttl in 5v figure 6. output disable with dual supplies. thermal shutdown status internal thermal shutdown circuitry shuts down the output when the die temperature reaches approximately 160 c, resetting when the die has cooled to 140 c. the e/s pin can be monitored to determine if shutdown has occurred. during normal operation the voltage on the e/s pin is typically 3.5v above the negative rail. once shutdown has occurred this voltage drops to approximately 350mv above the negative rail. figure 7 gives an example of monitoring shutdown in a single-supply application. figure 8 provides a circuit for dual supplies. external logic circuitry or an led could be used to indicate if the output has been thermally shutdown, see figure 13. figure 7. thermal shutdown status with a single supply. figure 8. thermal shutdown status with dual supplies. figure 5. output disable with a single supply. OPA547 v+ e/s hct or ttl 2.49k ? zetex zvn3310 5v v C OPA547 v+ e/s v C 1k ? 5v 22k ? 470 ? 2n3906 zetex zvn3310 OPA547 v+ e/s v C cmos or ttl
OPA547 11 sbos056b www.ti.com output disable and thermal shutdown status as mentioned earlier, the OPA547 s output can be disabled and the disable status can be monitored simultaneously. figures 9 and 10 provide examples using a single supply and dual supplies, respectively. OPA547 v+ e/s open drain (output disable) hct (thermal status shutdown) v C figure 9. output disable and thermal shutdown status with a single supply. output protection reactive and emf-generating loads can return load cur- rent to the amplifier, causing the output voltage to exceed the power-supply voltage. this damaging condition can be avoided with clamp diodes from the output terminal to the power supplies, as shown in figure 11. schottkey rectifier diodes with a 1a or greater continuous rating are recom- mended. figure 10. output disable and thermal shutdown status with dual supplies. figure 11. motor drive circuit. g = C = C 4 r 2 r 1 3 ? (carbon) 0.01 f r 2 20k ? r 1 5k ? OPA547 v C v+ v in motor d 1 d 2 d 1 , d 2 : international rectifier 11dq06. OPA547 v+ e/s note: (1) optional may be required to limit leakage current of optocoupler at high temperatures. v C (1) 6 1 2 4n38 optocoupler 5 4 hct or ttl in 5v 6 2 1 4n38 optocoupler 5 4 zetex zvn3310 ttl out 7.5k ? 1w 5v output stage compensation the complex load impedances common in power op amp applications can cause output stage instability. for normal operation output compensation circuitry is not typically re- quired. however, if the OPA547 is intended to be driven into current limit, a r/c network may be required. figure 11 shows an output series r/c compensation (snubber) net- work (3 ? in series with 0.01 f) which generally provides excellent stability. some variations in circuit values may be required with certain loads.
OPA547 12 sbos056b www.ti.com voltage source application figure 12 illustrates how to use the OPA547 to provide an accurate voltage source with only three external resistors. first, the current limit resistor, r cl , is chosen according to the desired output current. the resulting voltage at the i lim pin is constant and stable over temperature. this voltage, v cl , is connected to the noninverting input of the op amp and used as a voltage reference, thus eliminating the need for an external reference. the feedback resistors are selected to gain v cl to the desired output voltage level. figure 13. resistor-controlled programmable power supply. figure 12. voltage source. 31.6k ? r cl i lim 0.01 f (optional, for noisy environments) 4.75v i o = 5000 (4.75v) 31.6k ? + r cl v o = v cl (1 + r 2 /r 1 ) v C v+ v cl v cl = = 2.375v desired v o = 19v, r 1 = 1k ? and r 2 = 7k ? g = = 8 19 2.375 for example: 31.6k ? ? 4.75v (31.6k ? + 31.6k ? ) if i lim = 375ma, r cl = 31.6k ? r 2 r 1 uses voltage developed at i lim pin as a moderately accurate reference voltage. programmable power supply a programmable power supply can easily be built using the OPA547. both the output voltage and output current are user-controlled. figure 13 shows a circuit using potentiom- eters to adjust the output voltage and current while figure 14 uses dacs. an led tied to the e/s pin through a logic gate indicates if the OPA547 is in thermal shutdown. g = 1 + = 10 9k ? 1k ? 9k ? 1k ? OPA547 +30v +5v +5v 0.8v to 2.5v 0v to 4.75v output adjust v+ 5 6 thermal shutdown status notes: (1) for v o = 0v, v C = C 1v. (2) optional: improves noise immunity. (led) 74hct04 r 250 ? e/s v o = 0.8v to 25v (1) 7 4 3 1 2 v C i lim 14.7k ? 4.7k ? current limit adjust 1k ? 20k ? 0.01 f (2)
OPA547 13 sbos056b www.ti.com dac b 1/2 dac7800/1/2 (3) 1/2 dac7800/1/2 (3) 10pf i out b r fb b agnd b 0.01 f (2) i lim thermal shutdown status (led) 74hct04 r 250 ? 9k ? 1k ? v o = 0.8 to 25v (1) i o = 0 to 750ma g = 10 v C e/s dac a +5v +5v v ref b dgnd 10pf i out a r fb a output adjust OPA547 current limit adjust agnd a +30v v ref a notes: (1) for v o = 0v, v C = C 1v. (2) optional, improves noise immunity. (3) chose dac780x based on digital interface: dac7800 12-bit interface, dac7801 8-bit interface + 4 bits, dac7802 serial interface. (4) can use opa2237, i o = 100ma to 750ma. 1/2 opa2336 1/2 opa2336 v ref +10v figure 14. digitally-controlled programmable power supply. figure 16. multiple current limit values. OPA547 r c2 r c1 close for high current (could be open drain output of a logic gate). i lim v C ( ) e/s r 2 r 1 v in1 amp1 v o e/s r 4 r 3 v e/s > (v C ) +2.4v: amp 1 is on, amp 2 if off v o = C v in1 r 2 r 1 v e/s v in2 amp2 ( ) v e/s < (v C ) +2.4v: amp 2 is on, amp 1 if off v o = C v in2 r 4 r 3 figure 15. swap amplifier.
mechanical data mpsf015 ? august 2001 1 post office box 655303 ? dallas, texas 75265 ktw (r-psfm-g7) plastic flange-mount 0.010 (0,25) a m 4201284/a 08/01 0.385 (9,78) 0.410 (10,41) m m b c ?a? 0.006 ?b? 0.170 (4,32) 0.183 (4,65) 0.000 (0,00) 0.012 (0,305) 0.104 (2,64) 0.096 (2,44) 0.034 (0,86) 0.022 (0,57) 0.050 (1,27) 0.055 (1,40) 0.045 (1,14) 0.014 (0,36) 0.026 (0,66) 0.330 (8,38) 0.370 (9,40) 0.297 (7,54) 0.303 (7,70) 0.0585 (1,485) 0.0625 (1,587) 0.595 (15,11) 0.605 (15,37) 0.019 (0,48) 0.017 (0,43) 0 ~3 0.179 (4,55) 0.187 (4,75) 0.056 (1,42) 0.064 (1,63) 0.296 (7,52) 0.304 (7,72) 0.300 (7,62) 0.252 (6,40) f c c h h h c a notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. lead width and height dimensions apply to the plated lead. d. leads are not allowed above the datum b. e. stand?off height is measured from lead tip with reference to datum b. f. lead width dimension does not include dambar protrusion. allowable dambar protrusion shall not cause the lead width to exceed the maximum dimension by more than 0.003?. g. cross?hatch indicates exposed metal surface. h. falls within jedec mo?169 with the exception of the dimensions indicated.
mechanical data msot010 october 1994 1 post office box 655303 ? dallas, texas 75265 kc (r-psfm-t7) plastic flange-mount package 4040251 / b 01/95 0.420 (10,67) 0.055 (1,40) 0.335 (8,51) 0.030 (0,76) 0.026 (0,66) 0.380 (9,65) 0.325 (8,25) 0.045 (1,14) 0.113 (2,87) 0.103 (2,62) 0.146 (3,71) 0.156 (3,96) 0.122 (3,10) 0.102 (2,59) dia (see note c) 0.125 (3,18) 0.137 (3,48) 0.147 (3,73) 1.020 (25,91) 1.000 (25,40) 0.175 (4,46) 0.185 (4,70) 17 0.050 (1,27) 0.300 (7,62) 0.025 (0,64) 0.012 (0,30) m 0.010 (0,25) notes: a. all linear dimensions are in inches (millimeters). b. this drawing is subject to change without notice. c. lead dimensions are not controlled within this area. d. all lead dimensions apply before solder dip. e. the center lead is in electrical contact with the mounting tab.

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