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POWER BOOSTER AMPLIFIER
PB50
MICROTECHNOLOGY
HTTP://WWW.APEXMICROTECH.COM
(800) 546-APEX
(800) 546-2739
FEATURES
* * * * * * * WIDE SUPPLY RANGE -- 30V to 100V HIGH OUTPUT CURRENT -- Up to 2A Continuous VOLTAGE AND CURRENT GAIN HIGH SLEW RATE -- 50V/s Minimum PROGRAMMABLE OUTPUT CURRENT LIMIT HIGH POWER BANDWIDTH -- 160 kHz Minimum LOW QUIESCENT CURRENT -- 12mA Typical
APPLICATIONS
* HIGH VOLTAGE INSTRUMENTATION * Electrostatic TRANSDUCERS & DEFLECTION * Programmable Power Supplies Up to 180V p-p
EQUIVALENT SCHEMATIC
3 +Vs Q2 Q1 Q3 IN 4 GAIN 6.2K 7 50K COM 5 COMP 8 Q9 Q10 3.1K Q7 Q4 Q6 Q5 OUT 1 2 CL
DESCRIPTION
The PB50 is a high voltage, high current amplifier designed to provide voltage and current gain for a small signal, general purpose op amp. Including the power booster within the feedback loop of the driver amplifier results in a composite amplifier with the accuracy of the driver and the extended output voltage range and current capability of the booster. The PB50 can also be used without a driver in some applications, requiring only an external current limit resistor to function properly. The output stage utilizes complementary MOSFETs, providing symmetrical output impedance and eliminating secondary breakdown limitations imposed by Bipolar Junction Transistors. Internal feedback and gainset resistors are provided for a pin-strappable gain of 3. Additional gain can be achieved with a single external resistor. Compensation is not required for most driver/gain configurations, but can be accomplished with a single external capacitor. Although the booster can be configured quite simply, enormous flexibility is provided through the choice of driver amplifier, current limit, supply voltage, voltage gain, and compensation. This hybrid circuit utilizes a beryllia (BeO) substrate, thick film resistors, ceramic capacitors and semiconductor chips to maximize reliability, minimize size and give top performance. Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3 package is electrically isolated and hermetically sealed using one-shot resistance welding. The use of compressible isolation washers voids the warranty.
Q8
-Vs 6
EXTERNAL CONNECTIONS
R CL +Vs CL
3
2
OUT
IN
4
TOP VIEW
1
TYPICAL APPLICATION
CF RF +Vs IN COM -15V PB50 -Vs
Figure 1. Inverting composite amplifier.
COM
5
-Vs 6
COMP
8 7
GAIN RG
CC
VIN
RI
+15V OP AMP
R CL
OUT CC RG
RL
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PB50
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to -VS OUTPUT CURRENT, within SOA POWER DISSIPATION, internal at TC = 25C1 INPUT VOLTAGE, referred to common TEMPERATURE, pin solder--10 sec max TEMPERATURE, junction1 TEMPERATURE, storage OPERATING TEMPERATURE RANGE, case
ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS
200V 2A 35W 15V 300C 150C -65 to +150C -55 to +125C
SPECIFICATIONS
PARAMETER INPUT OFFSET VOLTAGE, initial OFFSET VOLTAGE, vs. temperature INPUT IMPEDANCE, DC INPUT CAPACITANCE CLOSED LOOP GAIN RANGE GAIN ACCURACY, internal Rg, Rf GAIN ACCURACY, external Rf PHASE SHIFT OUTPUT VOLTAGE SWING VOLTAGE SWING VOLTAGE SWING CURRENT, continuous SLEW RATE CAPACITIVE LOAD SETTLING TIME to .1% POWER BANDWIDTH SMALL SIGNAL BANDWIDTH SMALL SIGNAL BANDWIDTH POWER SUPPLY VOLTAGE, VS3 CURRENT, quiescent Full temperature range VS = 30 VS = 60 VS = 100 305 60 9 12 17 100 12 18 25 V mA mA mA Io = 2A Io = 1A Io = .1A Full temperature range Full temperature range RL = 100, 2V step VC = 100Vpp CC = 22pF, AV = 25, Vcc = 100 CC = 22pF, AV = 3, Vcc = 30 VS-11 VS-10 VS-8 2 50 160 VS -9 VS -7 VS -5 100 2200 2 320 100 1 V V V A V/s pF s kHz kHz MHz Full temperature range 25 3 AV = 3 AV = 10 F = 10kHz, AVCL = 10, CC = 22pF F = 200kHz, AVCL = 10, CC = 22pF .75 -4.5 50 3 10 10 15 10 60 1.75 -7 25 15 25 V mV/C k pF V/V % % TEST CONDITIONS2 MIN TYP MAX UNITS
THERMAL RESISTANCE, AC junction to case4 RESISTANCE, DC junction to case RESISTANCE, junction to air TEMPERATURE RANGE, case Full temp. range, F > 60Hz Full temp. range, F < 60Hz Full temperature range Meets full range specifications 1.8 3.2 30 25 2.0 3.5 85 C/W C/W C/W C
-25
NOTES: 1. 2. 3. 4. 5.
Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF (Mean Time to Failure). The power supply voltage specified under typical (TYP) applies, TC = 25C unless otherwise noted. +VS and -VS denote the positive and negative supply rail respectively. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. +VS must be at least 15V above COM, -VS must be at least 30V below COM. The PB50 is constructed from MOSFET transistors. ESD handling procedures must be observed. The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or subject to temperatures in excess of 850C to avoid generating toxic fumes.
CAUTION
APEX MICROTECHNOLOGY CORPORATION * 5980 NORTH SHANNON ROAD * TUCSON, ARIZONA 85741 * USA * APPLICATIONS HOTLINE: 1 (800) 546-2739
TYPICAL PERFORMANCE GRAPHS
PB50
CURRENT LIMIT
2
CURRENT LIMIT, I LIM (A) VOLTAGE DROP FROM SUPPLY, VS -- VO (V)
INTERNAL POWER DISSIPATION, P(W)
POWER DERATING
40
OUTPUT VOLTAGE SWING
10
RC
L
= .33
30
1.5 R CL = .27 1
RC = L .68
8
20
6
VO -
10
.5
R CL = 1.5
4 VO + 2 .1 .2 1 .01 .02 OUTPUT CURRENT, I O (A) 2
0 -25
0 25 50 75 100 125 CASE TEMPERATURE, TC (C) 0
CLOSED LOOP GAIN, A (dB) OPEN LOOP PHASE, ()
0 -25
0 50 75 100 125 25 CASE TEMPERATURE, TC (C)
SMALL SIGNAL RESPONSE
80
OPEN LOOP GAIN, A (dB)
30
SMALL SIGNAL RESPONSE
0
CLOSED LOOP PHASE, ()
SMALL SIGNAL RESPONSE
AV CL = 3 -45 AV CL = 10 AV CL = 25 -90
AV CL = 25 20 AV CL = 10 10 AV CL = 3 0 C C = 22pF 100K 1M 10K FREQUENCY, F (Hz) 10M
60
-45
40
-90
20
-135
-135 CC = 22pF -180 1K 100K 1M 10K FREQUENCY, F (Hz) 10M
0 100
1K 10K 100K 1M FREQUENCY, F (Hz)
-180 10M
-10 1K
QUIESCENT CURRENT
Vs = 100V 15 Vs = 60V Vs = 30V
INPUT OFFSET VOLTAGE, VOS (V)
INPUT OFFSET VOLTAGE
.5
SLEW RATE, SR (V/ s)
20
QUIESCENT CURRENT, I O (mA)
400
SLEW RATE VS. TEMP.
0 TEMP.
300 +SLEW 200 -SLEW
10
-.5
5
-1
SUPPLY
100
0 -25 75 100 125 0 25 50 CASE TEMPERATURE, T C (C)
-1.5 -25 0 25 50 75 100 125 CASE TEMPERATURE, TC (C) OR VS (V)
0 -25 0 25 50 75 100 125 CASE TEMPERATURE, T C (C)
360
POWER RESPONSE
1
DISTORTION, THD (%)
HARMONIC DISTORTION
.1
DISTORTION, THD (%)
HARMONIC DISTORTION
DRIVER = TL070 VS = 60V R L = 25 V O = 95VPP
180
VQ (V), p-p
.3
NO DRIVER VS = 60V V O = 80VPP R L = 25
.03
90 45 22 11 1K
.1
.01
.03
R L = 1K
.003 R L = 1K .001 300 1K 3K 10K FREQUENCY, F (Hz) 30K
3K
10K 30K 100K 300K 1M FREQUENCY, F (Hz)
.01 300
1K 3K 10K FREQUENCY, F (Hz)
30K
APEX MICROTECHNOLOGY CORPORATION * TELEPHONE (520) 690-8600 * FAX (520) 888-3329 * ORDERS (520) 690-8601 * EMAIL prodlit@apexmicrotech.com
PB50
GENERAL
Please read the "General Operating Considerations" section, which covers stability, supplies, heatsinking, mounting, current limit, SOA interpretation, and specification interpretation. Additional information can be found in the application notes. For information on the package outline, heatsinks, and mounting hardware, consult the "Accessory and Package Mechanical Data" section of the handbook.
OPERATING CONSIDERATIONS
STABILITY
Stability can be maximized by observing the following guidelines: 1. Operate the booster in the lowest practical gain. 2. Operate the driver amplifier in the highest practical effective gain. 3. Keep gain-bandwidth product of the driver lower than the closed loop bandwidth of the booster. 4. Minimize phase shift within the loop. A good compromise for (1) and (2) is to set booster gain from 3 to 10 with total (composite) gain at least a factor of 3 times booster gain. Guideline (3) implies compensating the driver as required in low composite gain configurations. Phase shift within the loop (4) is minimized through use of booster and loop compensation capacitors Cc and Cf when required. Typical values are 5pF to 33pF. Stability is the most difficult to achieve in a configuration where driver effective gain is unity (ie; total gain = booster gain). For this situation, Table 1 gives compensation values for optimum square wave response with the op amp drivers listed. DRIVER OP07 741 LF155 LF156 TL070 CCH 22p CF 22p 18p 4.7p 4.7p 15p CC 22p 10p 10p 10p 10p FPBW 4kHz 20kHz 60kHz 80kHz 80kHz SR 1.5 7 >60 >60 >60
CURRENT LIMIT
For proper operation, the current limit resistor (RCL) must be connected as shown in the external connection diagram. The minimum value is 0.27 with a maximum practical value of 47. For optimum reliability the resistor value should be set as high as possible. The value is calculated as follows: +IL= .65/ RCL + .010, -IL = .65/RCL.
SAFE OPERATING AREA (SOA)
3 2
OUTPUT CURRENT FROM +V SOR -VS (A)
t=
1
ST
ST
ST
EA
EA
EA
DY
ST
t=
t=
50
DY
ST
20
10
AT
T
0m s s
0m
ms
E
DY
AT
T
=
E
C
=2
ST
C
5
AT
E
85
C
T
C
12 5 C .1 10 20 30 40 50 100 200 300 SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE VS -- VO (V)
C
=
For: RF = 33K, RI = 3.3K, RG = 22K
Table 1: Typical values for case where op amp effective gain = 1.
CF RF +Vs IN COM -15V -Vs PB50 OUT
COMP
NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery diodes should be used.
COMPOSITE AMPLIFIER CONSIDERATIONS
Cascading two amplifiers within a feedback loop has many advantages, but also requires careful consideration of several amplifier and system parameters. The most important of these are gain, stability, slew rate, and output swing of the driver. Operating the booster amplifier in higher gains results in a higher slew rate and lower output swing requirement for the driver, but makes stability more difficult to achieve.
RI VIN
+15V C CH OP AMP
R CL
CC
GAIN R G
RL
GAIN SET
RG = [ (Av-1) * 3.1K] - 6.2K Av = RG + 6.2K 3.1K The booster's closed-loop gain is given by the equation above. The composite amplifier's closed loop gain is determined by the feedback network, that is: -Rf/Ri (inverting) or 1+Rf/Ri (non-inverting). The driver amplifier's "effective gain" is equal to the composite gain divided by the booster gain. Example: Inverting configuration (figure 1) with R i = 2K, R f = 60K, R g = 0 : Av (booster) = (6.2K/3.1K) + 1 = 3 Av (composite) = 60K/2K = - 30 Av (driver) = - 30/3 = -10 +1
Figure 2. Non-inverting composite amplifier.
SLEW RATE
The slew rate of the composite amplifier is equal to the slew rate of the driver times the booster gain, with a maximum value equal to the booster slew rate.
OUTPUT SWING
The maximum output voltage swing required from the driver op amp is equal to the maximum output swing from the booster divided by the booster gain. The Vos of the booster must also be supplied by the driver, and should be subtracted from the available swing range of the driver. Note also that effects of Vos drift and booster gain accuracy should be considered when calculating maximum available driver swing.
This data sheet has been carefully CORPORATION * to be NORTH SHANNON ROAD * assumed for possible inaccuracies or omissions. All specifications HOTLINE: change without notice. APEX MICROTECHNOLOGY checked and is believed 5980reliable, however, no responsibility isTUCSON, ARIZONA 85741 * USA * APPLICATIONS are subject to 1 (800) 546-2739 PB50U REV. G DECEMBER 1997 (c) 1997 Apex Microtechnology Corp.

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