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.
3 ABSOLUTE MAXIMUM RATINGS
SupplyVoltage(±Vs)
...................................................±20V
OutputCurrent,Source/Sink(Pins4,7)...................................
500mA
Analog Inputs (Pins 1, 2, 3, 8, 9, 10, 11 12, 13, 14, 15, 16) . . .
. . . . . . . . . . . . . . . . . . . . ±Vs
ErrorAmplifierOutputCurrent(Pin17)
................................... ±20mA
OscillatorChargingCurrent(Pin18).......................................
-2mA
PowerDissipationatTA =25°C(Note2) ................................
1000mW
PowerDissipationatTC=25°C(Note2)................................
2000mW
StorageTemperatureRange ...................................
-65°Cto+150°C
Lead Temperature (Soldering, 10 Seconds). . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . +300°C
