Controller. UC2637 Datasheet

UC2637 Datasheet PDF


Part

UC2637

Description

Switched Mode Controller

Manufacture

Unitrode

Page 18 Pages
Datasheet
Download UC2637 Datasheet


UC2637 Datasheet
Switched Mode Controller for DC Motor Drive
UC1637
UC2637
UC3637
FEATURES
Single or Dual Supply
Operation
• ±2.5V to ±20V Input Supply
Range
• ±5% Initial Oscillator
Accuracy; ± 10% Over
Temperature
Pulse-by-Pulse Current
Limiting
Under-Voltage Lockout
Shutdown Input with
Temperature Compensated
2.5V Threshold
Uncommitted PWM
Comparators for Design
Flexibility
Dual 100mA, Source/Sink
Output Drivers
BLOCK DIAGRAM
DESCRIPTION
The UC1637 is a pulse width modulator circuit intended to be used for a variety of
PWM motor drive and amplifier applications requiring either uni-directional or bi-
directional drive circuits. When used to replace conventional drivers, this circuit
can increase efficiency and reduce component costs for many applications. All
necessary circuitry is included to generate an analog error signal and modulate
two bi-directional pulse train outputs in proportion to the error signal magnitude
and polarity.
This monolithic device contains a sawtooth oscillator, error amplifier, and two
PWM comparators with ±100mA output stages as standard features. Protection
circuitry includes under-voltage lockout, pulse-by-pulse current limiting, and a
shutdown port with a 2.5V temperature compensated threshold.
The UC1637 is characterized for operation over the full military temperature range
of -55°C to +125°C, while the UC2637 and UC3637 are characterized for -25°C to
+85°C and 0°C to +70°C, respectively.
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (±Vs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20V
Output Current, Source/Sink (Pins 4, 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA
Analog Inputs (Pins 1, 2, 3, 8, 9, 10, 11 12, 13, 14, 15, 16) . . . . . . . . . . . . . . . . . . . . . . . ±Vs
Error Amplifier Output Current (Pin 17) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±20mA
Oscillator Charging Current (Pin 18). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2mA
Power Dissipation at TA = 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
Power Dissipation at TC = 25°C (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000mW
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Note 1: Currents are positive into, negative out of the specified terminal.
Note 2: Consult Packaging Section of Databook for thermal limitations and considerations
of package.
6/97

UC2637 Datasheet
CONNECTION DIAGRAM
DIL-18 (TOP VIEW)
J or N Package
SOIC-20 (TOP VIEW)
DW Package
PLCC-20, LCC-20
(TOP VIEW)
Q, L Packages
UC1637
UC2637
UC3637
PACKAGE PIN
FUNCTION
FUNCTION PIN
+VTH
1
CT 2
-VTH
3
AOUT
4
-VS 5
N/C 6
+VS 7
BOUT
8
+BIN
9
-BIN 10
-AIN 11
+AIN
12
+C/L
13
-C/L 14
SHUTDOWN 15
N/C 16
+E/A
17
-E/A 18
E/A OUTPUT 19
ISET
20
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the
UC1637; -25°C to +85°C for the UC2637; and 0°C to +70°C for the UC3637; +VS =
+15V, -VS = - 15V, +VTH = 5V, -VTH = -5V, RT = 16.7k, CT = 1500pF, TA=TJ.
PARAMETER
TEST CONDITIONS
Oscillator
Initial Accuracy
Voltage Stability
Temperature Stability
+VTH Input Bias Current
-VTH Input Bias Current
+VTH, -VTH Input Range
Error Amplifier
Input Offset Voltage
Input Bias Current
Input Offset Current
Common Mode Range
Open Loop Voltage Gain
Slew Rate
Unity Gain Bandwidth
CMRR
PSRR
TJ = 25°C (Note 6)
VS = ±5V to ±20V, VPIN 1 = 3V,
VPIN 3 = -3V
Over Operating Range (Note 3)
VPIN 2 = 6V
VPIN 2 = 0V
VCM = 0V
VCM = 0V
VCM = 0V
VS = ±2.5 to 20V
RL = 10k
Over Common Mode Range
VS = ±2.5 to ±20V
UC1637/UC2637
UC3637
UNITS
MIN TYP MAX MIN TYP MAX
9.4 10 10.6 9
57
10 11 kHz
5 7%
0.5 2
0.5 2
-10 0.1 10 -10 0.1 10
-10 -0.5
-10 -0.5
+VS-2
-VS+2 +VS-2
-VS+2
%
µA
µA
V
1.5 5
1.5 10 mV
0.5 5
0.5 5 µA
0.1 1
0.1 1 µA
-VS+2
+VS -VS+2
+VS V
75 100
80 100
dB
15 15 V/µS
2 2 MHz
75 100
75 100
dB
75 110
75 110
dB
2


Features Datasheet pdf Switched Mode Controller for DC Motor Dr ive UC1637 UC2637 UC3637 FEATURES • Single or Dual Supply Operation • ± 2.5V to ±20V Input Supply Range • ± 5% Initial Oscillator Accuracy; ± 10% Over Temperature • Pulse-by-Pulse Cur rent Limiting • Under-Voltage Lockout • Shutdown Input with Temperature Co mpensated 2.5V Threshold • Uncommitte d PWM Comparators for Design Flexibilit y • Dual 100mA, Source/Sink Output Dr ivers BLOCK DIAGRAM DESCRIPTION The UC 1637 is a pulse width modulator circuit intended to be used for a variety of P WM motor drive and amplifier applicatio ns requiring either uni-directional or bidirectional drive circuits. When used to replace conventional drivers, this circuit can increase efficiency and red uce component costs for many applicatio ns. All necessary circuitry is included to generate an analog error signal and modulate two bi-directional pulse trai n outputs in proportion to the error si gnal magnitude and polarity. This monolithic device contains a sawtooth oscillator,.
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