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
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UC3176 |
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UC3177 |
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CONNECTION DIAGRAM |
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PLCC-28 (Top View) |
PACKAGE PIN FUNCTION |
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FUNCTION |
PIN |
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QP Package |
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+VIN |
1 |
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B Output |
2 |
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BISINK(Sense) |
3 |
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BISINK |
4 |
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N/C |
5-7 |
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B- Input |
8 |
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* |
9 |
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Park/Inhibit |
10 |
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Parking Drive |
11 |
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Gnd (Heat Flow Pins) |
12-18 |
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UV1 |
19 |
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UV2 |
20 |
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Current Feedback |
21 |
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A+ Input |
22 |
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A- Input |
23 |
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N/C |
24 |
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AISINK |
25 |
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AISINK(Sense) |
26 |
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A Output |
27 |
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Gnd |
28 |
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*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 |
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Supply Current |
+VIN = 12V |
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18 |
25 |
mA |
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+VIN = 35V |
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21 |
30 |
mA |
UVOL Threshold |
+VIN low to high |
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2.8 |
3.0 |
V |
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Threshold Hysteresis |
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220 |
300 |
mV |
Power, Amplifier, A and B |
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Input Offset Voltage |
VCM = 6V, VOUT = 6V |
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8 |
mV |
Input Bias Current |
VCM = 6V, Except A+ Input |
-500 |
-100 |
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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 |
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200 |
nA |
CMRR |
VCM = 1 to 33V, +VIN =35V, VOUT = 6V |
70 |
100 |
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dB |
PSRR |
+VIN = 5 to 35V, VCM = 2.5V |
70 |
100 |
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dB |
Large Signal Voltage Gain |
VOUT = 3V, w/IOUT = 1A to VOUT = 9V, w/IOUT = -1A |
1.5 |
4 |
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V/mV |
Thermal Feedback |
+VIN = 20V, Pd = 20W at opposite output |
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25 |
200 |
μV/W |
Saturation Voltage |
IOUT = -2A, High Side, TJ = 25° |
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1.9 |
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V |
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CIOUT = 2A, Low Side, TJ = 25°C |
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1.6 |
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V |
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Total VSAT at 2A, TJ = 25°C |
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3.5 |
3.7 |
V |
Unity Gain Bandwidth |
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1 |
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MHz |
Slew Rate |
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1 |
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V/μs |
Differential IOUT Sense Error Current |
IOUT(A) = -IOUT(B), /IOUT/- /AISINK - BISINK/ |
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in Bridge Configuration |
IOUT ≤200mA |
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3.0 |
6.0 |
mA |
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IOUT ≤ 2A |
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5.0 |
10 |
mA |
High Side Current Limiting |
=VIN - VOUT < 12V |
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-2.7 |
-2.0 |
A |
2
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