UNITRODE UC3176, UC3177 Technical data

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UNITRODE UC3176, UC3177 Technical data

UC3176QP

UC3176

UC3177

Full Bridge Power Amplifier

FEATURES

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 Protection

3V to 35V Operation

DESCRIPTION

The UC3176/7 family of full bridge power amplifiers is rated for a continuous output current of 2A. Intended for use in demanding 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 limiting and thermal shutdown, resulting in a very rugged device.

Auxiliary functions on this device include a dual input 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 operational over a 3V to 35V supply range. Internal un- der-voltage lockout provides predictable power-up and power-down characteristics.

BLOCK DIAGRAM

10/94

ABSOLUTE MAXIMUM RATINGS (Note 1)

Input Supply voltage, (+VIN) . . . . . . . . . . . . . . . . . . . . . . . 40V Park/Inhibit, UV1 and UV2 inputs (zener clamped)

Maximum forced voltage . . . . . . . . . . . . . . . . -0.3V to 10V Maximum forced current. . . . . . . . . . . . . . . . . . . . . ±10mA Other Input Voltages. . . . . . . . . . . . . . . . . . . . . -0.3V to +VIN AlSINK and BlSINK Voltages . . . . . . . . . . . . . . . . . . -0.3V to 6V Open Collector Output Voltages. . . . . . . . . . . . . . . . . . . . 40V

A and B Output Currents (Continuous)

Source . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited Sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5A Total Supply Current (Continuous). . . . . . . . . . . . . . . . . . . 4A Parking Drive Output Current (Continuous) . . . . . . . . 200mA Supply OK Output Current, UC3177 (Continuous) . . . 30mA Operating Junction Temperature . . . . . . . . -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 indicated, voltages are reference to ground and currents are positive into, negative out of, the specified terminals.

THERMAL DATA

QP package:

Thermal Resistance Junction to Leads, θJL . . . . . . 15°C/W Thermal Resistance Junction to Ambient, θJA . . . . 50°C/W

 

 

UC3176

 

 

UC3177

CONNECTION DIAGRAM

 

 

PLCC-28 (Top View)

PACKAGE PIN FUNCTION

FUNCTION

PIN

QP Package

+VIN

1

 

 

B Output

2

 

BISINK(Sense)

3

 

BISINK

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

 

AISINK

25

 

AISINK(Sense)

26

 

A Output

27

 

Gnd

28

*Pin 9: UC3176, B+ Input

UC3177, Supply OK

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

PARAMETER

TEST CONDITIONS

MIN.

TYP.

MAX.

UNITS

Input Supply

 

 

 

 

 

Supply Current

+VIN = 12V

 

18

25

mA

 

+VIN = 35V

 

21

30

mA

UVOL Threshold

+VIN low to high

 

2.8

3.0

V

 

Threshold Hysteresis

 

220

300

mV

Power, Amplifier, A and B

 

 

 

 

 

Input Offset Voltage

VCM = 6V, VOUT = 6V

 

 

8

mV

Input Bias Current

VCM = 6V, Except A+ Input

-500

-100

 

nA

Input Bias Current at A+/Reference Input

(A+/Ref - BISINK)/36kohms; TJ = 25°C

23

28

35

μA/V

Input Offset Current B Amp (UC3176 Only)

VCM = 6V

 

 

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 Voltage Gain

VOUT = 3V, w/IOUT = 1A to VOUT = 9V, w/IOUT = -1A

1.5

4

 

V/mV

Thermal Feedback

+VIN = 20V, Pd = 20W at opposite output

 

25

200

μV/W

Saturation Voltage

IOUT = -2A, High Side, TJ = 25°

 

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

 

 

1

 

MHz

Slew Rate

 

 

1

 

V/μs

Differential IOUT Sense Error Current

IOUT(A) = -IOUT(B), /IOUT/- /AISINK - BISINK/

 

 

 

 

in Bridge Configuration

IOUT 200mA

 

3.0

6.0

mA

 

IOUT 2A

 

5.0

10

mA

High Side Current Limiting

=VIN - VOUT < 12V

 

-2.7

-2.0

A

2

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