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

• 3V to 35V Operation

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