Texas Instruments UC3176QPTR, UC3176QP Datasheet

10/94

• 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

Full Bridge Power Amplifier

UC3176
UC3177

FEATURES DESCRIPTION

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 curren t, 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 are o perational over a 3V to 35V supply range. Internal un­der-voltage lockout p rovides predictable power-up and power-down char­acteristics.

BLOCK DIAGRAM

Input Supply voltage, (+V IN). . . . . . . . . . . . . . . . . . . . . . . 40V

Park/Inhibit, UV1 and UV2 inputs (ze ner clamp ed)

Maximum forced voltage . . . . . . . . . . . . . . . . -0.3V to 10V

Maximum forced curr ent. . . . . . . . . . . . . . . . . . . . . ±10mA

Other I nput Volta ges . . . . . . . . . . . . . . . . . . . . . -0.3V to + V

IN

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 Output 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 Temperature. . . . . . . . . . . . . . . . . -65°C to +150°C

Note 1: Unless otherwise indica te d, volta ges are re feren ce to
ground and curre nt s are posit ive in to, negat ive out of , the
specified terminals.

PARAMETER TEST CONDITION S MIN. TYP. MAX. UNITS

Input S u p pl y

Supply Curren t +V

IN = 12V

18 25 mA

+VIN = 35V

21 30 mA

UVOL Threshold +VIN low to high

2.8 3.0 V

Threshold Hyst er esis

220 300 mV

Power, Amplifier, A and B

Input Offset Voltage V

CM = 6V, VOUT = 6V

8mV

Input Bias Current VCM = 6V, Ex cept A+ Input

-500 -100 nA

Input Bias Cu rrent at A+/Refe rence Input (A+/Ref - BISINK)/36kohms; T J = 25°C

23 28 35 µA/V

Input Offset Cur ren t B Amp (UC3176 O nly) V CM = 6 V

200 nA

CMRR VCM = 1 to 33V, +VIN =35V, VOUT = 6V

70 100 dB

PSRR +VIN = 5 to 35V, VCM = 2.5V

70 100 dB

Large Signal Volta ge G ai n VOUT = 3V, w/IOUT = 1A to VOUT = 9V, w/ IOUT = -1A

1.5 4 V/m V

Thermal Fe edback +VIN = 20V, Pd = 20W at opp osit e output

25 200 µV/W

Saturation Voltage IOUT = -2A, High Side, TJ = 2 5°

1.9 V

CIOUT = 2A, Low Side, TJ = 25°C

1.6 V

Total VSAT at 2A, TJ = 25°C

3.5 3.7 V

Unity Gain Bandwidth

1MHz

Slew Rate

1V/µs

Dif fere ntial I

OUT

Sense Error Current IOUT(A) = -IOUT(B), / IOUT/- /AISINK - BISINK/

in Bridge Configur at ion IOUT ≤20 0mA

3.0 6.0 mA

IOUT ≤ 2A

5.0 10 mA

High Side Current Limiting =VIN - VOUT < 12V

-2.7 -2.0 A

UC3176
UC3177

ABSOLUTE MAXIMUM RATINGS (Note 1)

QP package:
Thermal Resistance Junct ion to Lea ds, θ

JL . . . . . . 15°C/W

Thermal Resistance Junct ion to Am bient , θ

JA . . . . 50°C/W

THERMAL DATA

PACKAGE PIN FUNCTION

FUNCTION PIN

+VIN 1
B Output 2
BI

SINK (S ense) 3

BI

SINK 4

N/C 5-7
B- Input 8
* 9
Park/Inhibit 10
Parking Drive 11
Gnd ( Heat Flow Pins) 12-18
UV1 19
UV2 20
Current Feedback 21
A+ Input 22
A- Input 23
N/C 24
AI

SINK 25

AI

SINK (Sense) 26

A Output 27
Gnd 28

*Pin 9: UC3176, B+ Input
UC3177, Supply OK

PLCC-28 (Top View)
QP Package

CONNECTION DIAG RAM

ELECTRICAL CHARACTERIST ICS :

Unless otherwise stated, specifications hold for TA = 0 to 70° C, +VIN = 12V, TA = TJ

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