UC3177 Datasheet PDF - Unitrode


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UC3177
Unitrode

Part Number UC3177
Description Full Bridge Power Amplifier
Page 4 Pages

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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 continu-
ous output current of 2A. Intended for use in demanding servo applica-
tions 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 com-
parator 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 char-
acteristics.
BLOCK DIAGRAM
SLUS285A - OCTOBER 1994 - REVISED JANUARY 2005



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UC3176
UC3177
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
THERMAL DATA
QP package:
Thermal Resistance Junction to Leads, θJL . . . . . . . 15°C/W
Thermal Resistance Junction to Ambient, θJA . . . . . 50°C/W
Thermal Resistance Junction to COSC, θJC . . . . . . . 30°C/W
CONNECTION DIAGRAM
PLCC-28 (Top View)
QP Package
*Pin 9: UC3176, B+ Input
UC3177, Supply OK
PACKAGE PIN FUNCTION
FUNCTION
PIN
+VIN
1
B Output
2
BISINK (Sense)
BISINK
N/C
3
4
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
AISINK (Sense)
A Output
25
26
27
Gnd 28
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
Input Bias Current at A+/Reference Input (A+/REF - BISINK) /36k; TJ = 25°C
–500 –100
nA
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
Thermal Feedback
VOUT = 3V, w/IOUT = 1A to VOUT = 9V,
w/IOUT = –1A
+VIN = 20V, Pd = 20W at opposite output
1.5 4
V/mV
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 in
Bridge Configuration
IOUT(A) = –IOUT(B), /IOUT / – /AISINK - BISINK /
IOUT 200mA
IOUT 2A
3.0 6.0 mA
5.0 10 mA
High Side Current Limiting
=VIN - VOUT < 12V
–2.7 –2.0 A
2



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UC3176
UC3177
ELECTRICAL CHARACTERISTICS:Unless otherwise stated, specifications hold for TA = 0 to 70°C, +VIN = 12V, TA = TJ.
PARAMETER
Current Sense Amplifier
Input Offset Voltage
Thermal Gradient Sensitivity
PSRR
Gain
Slew Rate
3dB Bandwidth
MAX Output Current
Output Saturation Voltage
Under-Voltage Comparator
Threshold Voltage
Input Current
Supply OK VSAT (UC3177 Only)
Supply OK Leakage (UC3177 Only)
Park/Inhibit
Park/Inhibit Thl’d
Park/Inhibit Input Current
Parking Drive Saturation Voltage
Parking Drive Leakage
Thermal Shutdown
Shutdown Temperature
TEST CONDITIONS
MIN. TYP. MAX. UNITS
VCM = 0V, A+ / REF at 6V
REF = 2V to 20V, +VIN = 35, change with REF
Input voltage
3 mV
600 µV/V
+VIN = 20V, REF = 10V Pd = 20W @ A or B
Output
5.0 75.0 µV/W
REF = 2.5V, +VIN = 5 to 35V
/AISINK-BISINK / 0.5V
70 100
dB
7.8 8.0 8.1 V/V
2 V/µS
1 MHz
ISOURCE = +VIN - VOUT = 0.5V
ISOURCE = 1.5mA, High Side
ISINK = 5mA, Low Side
2.5 3.5
mA
0.15 0.30 V
1.4 1.85 V
Low to High, other input at 5V
Threshold Hysteresis
Input = 2V, other input at 5V
IOUT = 5mA
VOUT = 35V
1.44
50
–2.00
1.50
70
–.05
1.56
80
0.45
5
V
mV
µA
V
µA
At threshold
IOUT = 100mA
VOUT = 35V
1.1 1.3 1.7 V
60 100 µA
0.3 0.7 V
15 µA
165 °C
Output saturation voltage vs. current. Maximum source current vs. + VIN – Crossover current error
VOUT.
characteristic.
3



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APPLICATION AND OPERATION INFORMATION
UC3176
UC3177
WAVEFORMS FOR ABOVE APPLICATION
DESIGN EQUATIONS
Transconductance
(GO)
=
IL
VS
=
R
R
F2
F1
×

1
8RS

with: RSA = RSB and RF3 = RF4
Parking
Current
(IP)
=
VIN
RP
1.5
+RL
where: RL = load resistance
Under-Voltage Thresholds, at Supplies
High to Low Threshold, (VLH) = 1.425 (RA + RB)/RB
Low to High Threshold, (VHL) = 1.5 (RA + RB)/RB
4




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