UNITRODE UC3176, UC3177 Technical data

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Full Bridge Power Amplifier
FEATURES DESCRIPTION
Dual Power Operational Amplifiers
•±2A Output Current Guaranteed
Precision Current Sense Amplifier
Two Supply Monitoring Inputs
Parking Function and Under-Voltage
Lockout
Safe Operating Area Protect ion
The UC3176/7 family of full bridge power amplifiers is rated for a continu­ous output current of 2A. Intended for use in dem anding servo applications such as disk head positioning, the onboard current sense amplifier can be used to obtain precision control of load current, or where voltage mode drive is required, a standard voltage feedback scheme can be used. Out­put stage protection includes foldback current l imiting and thermal shut­down, resulting in a very rugged device.
Auxiliary functions on this device i nclude a dual in put under-voltage com­parator that can be programmed to respond to low voltage conditions on two independent supplies. In response to an under-voltage condition the power Op-Amps are inhibited and a high current, 100mA, open collector drive output is activated. A separate Park/Inhibit command input.
The devices a re operational over a 3V to 35V supply range. Internal un­der-voltage lockout p rovides predictable power-up and power-down char­acteristics.
UC3176 UC3177
BLOCK DIAGRAM
10/94
ABSOLUTE MAXIMUM RATINGS (Note 1)
*Pin 9: UC3176, B+ Input
UC3177, Supply OK
Input Supply voltage, (+VIN). . . . . . . . . . . . . . . . . . . . . . . 40V
Park/Inhibit, UV1 and UV2 inputs (ze ner clamp ed)
Maximum forced voltage . . . . . . . . . . . . . . . . -0.3V to 10V
Maximum forced curr ent. . . . . . . . . . . . . . . . . . . . . ±10mA
Ot h er Inpu t Vo l tages. . . . . . . . . . . . . . . . . . . . . -0.3V t o +V
AlSINK and BlSINK Voltages. . . . . . . . . . . . . . . . . . -0.3V to 6V
Open Collector Out put Voltages. . . . . . . . . . . . . . . . . . . . 40V
A and B Output Curren ts (Continuo us)
Source . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited
Sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5A
Total Supply Cu rr ent (Continuous). . . . . . . . . . . . . . . . . . . 4 A
Parking Drive Outp ut Curr ent (Continu ous). . . . . . . . 200mA
Supply OK Output Current, UC3177 (Cont inuous ) . . . 30mA
Operating Jun ctio n Tem per atur e. . . . . . . . -55°C to +150°C
Power Dissipation at TC = +75°C
QP package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4W
Storage Tem pe ratur e. . . . . . . . . . . . . . . . . -65°C to +150°C
Note 1: Unless otherwise indica te d, volta ges are re feren ce t o ground and curre nt s are posit ive in to, negat ive out of , the specified terminals.
THERMAL DATA
QP package: Thermal Resistance Junct ion to Lea ds, θ Thermal Resistance Junct ion to Am bient , θ
JL . . . . . . 15°C/W
JA . . . . 50°C/W
CONNECTION DIAG RAM
PLCC-28 (Top View) QP Package
IN
UC3176 UC3177
PACKAGE PIN FUNCTION
FUNCTION PIN
+VIN 1 B Output 2
SINK (S ense) 3
BI BI
SINK 4
N/C 5-7 B- Input 8 * 9 Park/Inhibit 10 Parking Drive 11 Gnd ( Heat Fl o w Pins) 12-18 UV1 19 UV2 20 Current Feedback 21 A+ Input 22 A- Input 23 N/C 24
SINK 25
AI
SINK (Sense) 26
AI A Output 27 Gnd 28
ELECTRICAL CHARACTERIST ICS :
Unless otherwise stated, specifications hold for TA = 0 to 70° C, +VIN = 12V, TA = TJ
PARAMETER TEST CONDITION S MIN. TYP. MAX. UNITS
Input S u p pl y
Supply Curren t +V
IN = 12V
+VIN = 35V
UVOL Threshold +VIN low to high
Threshold Hyst er esis
Power, Amplifier, A and B
Input Offset Voltage V
CM = 6V, VOUT = 6V
Input Bias Current VCM = 6V, Ex cept A+ Input Input Bias Cu rrent at A+/Refe rence Input (A+/Ref - BISINK)/36kohms; T J = 25°C Input Offset Cur ren t B Amp (UC3176 O nly) V CM = 6V CMRR VCM = 1 to 33V, +VIN =35V, VOUT = 6V PSRR +VIN = 5 to 35V, VCM = 2.5V Large Signal Volta ge G ai n VOUT = 3V, w/IOUT = 1A to VOUT = 9V, w/ IOUT = -1A Thermal Fe edback +VIN = 20V, Pd = 20W at opp osit e output Saturation Voltage IOUT = -2A, High Side, TJ = 2 5°
CIOUT = 2A, Low Side, TJ = 25°C
Total VSAT at 2A, TJ = 25°C Unity Gain Bandwidth Slew Rate Dif fere ntial I
Sense Error Current IOUT(A) = -IOUT(B), / IOUT/- /AISINK - BISINK/
OUT
in Bridge Configur at io n IOUT 20 0mA
IOUT ≤ 2A High Side Current Limiting =VIN - VOUT < 12V
.
18 25 mA 21 30 mA
2.8 3.0 V
220 300 mV
8mV
-500 -100 nA 23 28 35 µA/V
200 nA 70 100 dB 70 100 dB
1.5 4 V/m V 25 200 µV/W
1.9 V
1.6 V
3.5 3.7 V 1MHz 1V/µs
3.0 6.0 mA
5.0 10 mA
-2.7 -2.0 A
2
UC3176 UC3177
ELECTRICAL CHARACTERIST ICS :
Crossover Current Error
Characteristic
Unless otherwise stated, specifications hold for TA = 0 to 70° C, +VIN = 12V, TA = TJ
PARAMETER TEST CONDITION S MIN. TYP. MAX. UNIT S
Current Sense Amplifier
Input Offset Voltage V
CM = 0V, A+/Ref at 6V
Ref = 2V to 20V, +VIN = 35, change with Ref input voltage
Thermal Gr adient Sensitivity +VIN = 20V, Ref = 10V Pd = 20W @ A or B
outp ut PSRR Ref = 2.5V, +VIN = 5 to 35V Gain /AISINK - BISINK/ ≤ 0.5V Slew Rate 3dB Bandwidth Max Output Current ISOURCE = +VIN - VOUT = 0.5V Output Saturation Voltage ISOURCE = 1.5mA, High Side
ISINK = 5mA, Low Side
Under-Vol t age Co m pa rat or
Threshold Voltage Low to High, other input at 5V
Threshold Hyst er esis Input Current Input = 2V, other input at 5V Supply OK V
(UC3177 Only) IOUT = 5mA
SAT
Supply OK Leakage ( UC3177 Only) VOUT = 35V
Park/Inhibit
Park/Inhibit Thl’d Park/Inhibit In put Current At thres hold Parking Drive Satur at ion Volta ge I Parking Drive Leakage V
= 100mA
OUT
OUT
= 35V
Therma l Shu tdo wn
Shutdown Te mp era tu re
.
3mV
600 µV/V
5.0 75 µV/W
70 100 dB
7.8 8 8.1 V/V 2V/µS 1MHz
2.5 3.5 mA
0.15 0.30 V
1.4 1.7 V
1.44 1.50 1.56 V 50 70 80 mV
-2 -.05 µA
0.45 V 5 µA
1.1 1.3 1.7 V 60 100 µA
0.3 0.7 V 15 µA
165 °C
Output Saturatio n Voltage
vs Current
Maximum Source Current
vs +V
IN - VOUT
3
APPLICATION AND OPERATION INFORMATION
UC3176 UC3177
WAVEFORMS FOR ABOV E APPLI CATION
UNITRODE INTEGRATED CIRCUITS 7 CONTINENTAL BLVD. MERRIMACK, NH 03054 TEL. (603) 424-2410 FAX (603) 424-3460
DESIGN EQUATI ONS
I
L
R
Transconduc tance (GO) =
with: R
Parking Current (IP) =
SA = RSB and RF3 = RF4
V
IN
R
V
1.5
P
+
F2
=
S
R
F1
R
L
where: RL = load resistance Under-Volt age Thres h olds, at Supplies
High to Low Threshold, (V
LH) = 1.425 (RA + RB)/RB
Low to High Threshold, (VHL) = 1.5 (RA + RB)/RB
×
1
R
S
8
4
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