phase locked frequency controller uc1634 uc2634 uc3634 features precision phase locked frequency control system communication logic for 2-phase motors disable input for motor inhibit crystal oscillator programmable reference frequency dividers phase detector with absolute frequency steering digital lock indicator two high current op-amps 5v reference output description the uc1634 series of devices is optimized to provide precision phase locked frequency control for two phase dc brushless mo - tors. these devices include most of the features of the general purpose uc1633 phase locked control family and also provide the out-of-phase commutation signals required for driving two phase brushless motors. only an external power booster stage is required for a complete drive and control system. the two commutation outputs are open collector devices that can sink in excess of 16ma. a disable input allows the user to simul - taneously force both of these outputs to an active low state. double edge logic, following the sense amplifier, doubles the ref - erence frequency at the phase detector by responding to both edges of the input signal at pin 7. block diagram 6/93
connection diagrams uc1634 uc2634 uc3634 package pin function function pin n/c 1 div 2/4/8 2 lock indicator output 3 phase detector output 4 disable input 5 n/c 6 driver a output 7 driver b output 8 sense amp output 9 5v ref output 10 loop amp inv input 11 loop amp output 12 buffer amp input 13 buffer amp output 14 +v in 15 n/c 16 osc output 17 osc input 18 ground 19 div 4/5 input 20 dil-16, soic-16 (top view) j or n package, dw package input supply voltage (+vin). . . . . . . . . . . . . . . . . . . . . . . . +20v reference output current . . . . . . . . . . . . . . . . . . . . . . . -30ma op-amp output currents . . . . . . . . . . . . . . . . . . . . . . . . 30ma op-amp input voltages . . . . . . . . . . . . . . . . . . . . . -.3v to +20v phase detector output current . . . . . . . . . . . . . . . . . . . 10ma lock indicator output current . . . . . . . . . . . . . . . . . . . . +15ma lock indicator output voltage . . . . . . . . . . . . . . . . . . . . . . +20v divide select input voltage . . . . . . . . . . . . . . . . . . -.3v to +10v disable input voltage . . . . . . . . . . . . . . . . . . . . . . . -.3v to +10v oscillator input voltage . . . . . . . . . . . . . . . . . . . . . . -.3v to +5v sense amplifier input voltage . . . . . . . . . . . . . . . . -.3v to +20v driver output currents . . . . . . . . . . . . . . . . . . . . . . . . . . +30ma driver output voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20v power dissipation at t a = 25c(note 2) . . . . . . . . . . . 1000mw power dissipation at t c = 25c (note 2) . . . . . . . . . . . 2000mw operating junction temperature . . . . . . . . . . . -55c to +150c storage temperature . . . . . . . . . . . . . . . . . . . . -65c to +150c lead temperature (soldering, 10 seconds) . . . . . . . . . . 300c plcc-20 (top view) q package note 1: voltages are referenced to ground, (pin 16, dil pack- age). currents are positive into, negative out of, the specified terminals. note 2: consult packaging section of databook for thermal limitations and considerations of package. absolute maximum ratings (note 1, 2) parameters test conditions min typ max units supply current +v in = 15v 20 29 ma reference output voltage (v ref ) 4.75 5.0 5.25 v load regulation i out = 0ma to 7ma 5.0 20 mv line regulation +v in = 8v to 15v 2.0 20 mv short circuit current v out = 0v 12 30 ma oscillator dc voltage gain oscillator in to oscillator out 12 16 20 db input dc level (v ib ) oscillator in pin open, t j = 25c 1.15 1.3 1.45 v input impedance (note 3) v in = v ib 0.5v, t j = 25c 1.3 1.6 1.9 k w output dc level oscillator in pin open, t j = 25c 1.2 1.4 1.6 v maximum operating frequency 10 mhz dividers maximum input frequency input = 1v pp at oscillator in 10 mhz div. 4/5 input current input = 5v (div. by 4) 150 500 m a (q package only, note 4) input = 0v (div. by 5) -5.0 0.0 5.0 m a unless otherwise stated, these specifications apply for t a = 0c to +70c for the uc3634, -25c to + 85c for the uc2634 and -55c to +125c for the uc1634, +v in = 12v. t a =t j. electrical characteristics: 2
parameters test conditions min typ max units dividers (cont.) div. 4/5 input threshold (q package only, note 4) 0.5 1.6 2.2 v div. 2/4/8 input current input = 5v (div. by 8) 150 500 m a input = 0v (div. by 2) -500 -150 m a div. 2/4/8 open current voltage input current = 0 m a (div. by 4) 1.5 2.5 3.5 v div. by 2 threshold 0.20 0.8 v div. by 4 threshold 1.5 3.5 v div. by 8 threshold volts below v ref 0.20 0.8 v sense amplifier threshold voltage percent of v ref 27 30 33 % threshold hysteresis 10 mv input bias current input = 1.5v -1.0 -0.2 m a two phase drive outputs, a and b saturation voltage i out = 16ma 0.3 0.6 v leakage current v out = 15v 0.1 5.0 m a disable input input current input = 5v (disabled, a and b outputs active low) 150 500 m a input = 0v (enabled) -5.0 0.0 5.0 m a threshold voltage 0.5 1.6 2.2 v phase detector high output level positive phase / freq. error, volts below v ref 0.2 0.5 v low output level negative phase / freq. error 0.2 0.5 v mid output level zero phase / freq. error, percent of v ref 47 50 53 % high level maximum source current v out = 4.3v 2.0 8.0 ma low level maximum sink current v out = 0.7v 2.0 5.0 ma mid level output impedance (note 3) i out = -200 to +200 m a, t j = 25c 4.5 6.0 7.5 k w lock indicator output saturation voltage freq. error, i out = 5ma 0.3 0.45 v leakage current zero freq. error, v out = 15v 0.1 1.0 m a loop amplifier n inv. reference voltage percent of v ref 47 50 53 % input bias current input = 2.5v -0.8 -0.2 m a avol 60 75 db psrr +v in = 8v to 15v 70 100 db short circuit current source, v out = 0v 16 35 ma sink, v out = 5v 16 30 ma buffer op-amp input offset voltage v cm = 2.5v 8 mv input bias current v cm = 2.5v -0.8 -0.2 m a psrr +v in = 8 to 15v 70 100 db cmrr v cm = 0 to 10v 70 100 db short circuit current source, v out = 0v 16 35 ma sink, v out = 5v 16 30 ma note 3: these impedance levels will vary with t j at about 1700ppm/c. note 4: this part is also available in a 20 pin plastic leadless chip carrier, q designator, where a divide by 4/5 select pin is available. consult factory for details. uc1634 uc2634 uc3634 unless otherwise stated, these specifications apply for t a = 0c to +70c for the uc3634, -25c to + 85c for the uc2634 and -55c to +125c for the uc1634, +v in = 12v. t a =t j electrical characteristics: 3
uc1634 uc2634 uc3634 application and operation information (for additional information see uc1633 data sheet) design example: precision phased locked frequency control of a 2-phase motor at 3600 rpm. using the commutation logic on the uc3634, a simple discrete drive scheme is possible. unitrode integrated circuits 7 continental bl vd. merrimack, nh 03054 tel. (603) 424-2410 fax (603) 424-3460 4
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