Unitrode UC1637
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 bidirectional drive circuits. When used to replace conventional drivers, this circuit can increase efficiency and reduce component costs for many applications. This monolithic device contains a sawtooth oscillator, error amplifier, and two PWM comparators with ±100mA output stages as standard features.| Part No. | UC1637 |
|---|---|
| Datasheet | UC1637 Download |
| Manufacturer |  Unitrode |
| Description | DC Motor Controller |
| Buy | Stock & Price |
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
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. 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) . . . . . . . . . . . . . . . . . . . .
