1FEATURES

• QML-V Qualified, SMD 5962-89957

• Rad Tolerant: 30 kRad(Si) TID (1)

– TID Dose Rate = 10 mRad/sec

• Single or Dual Supply Operation

• ±2.5-V to ±20-V Input Supply Range

• ±5% Initial Oscillator Accuracy; ±10% Over

Temperature

• Pulse-by-Pulse Current Limiting

• Under-Voltage Lockout

• Shutdown Input with Temperature

Compensated 2.5-V Threshold

• Uncommitted PWM Comparators for Design

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 ±100-mA

output stages as standard features. Protection circuitry includes under-voltage lockout, pulse-by-pulse current

limiting, and a shutdown port with a 2.5-V temperature compensated threshold.

The UC1637 is characterized for operation over the full space temperature range of –55°C to 125°C.