The UC1638 family of integrated circuits are advanced pulse width modulators intended for a variety of PWM motor drive and amplifier applications requiring either uni-directional or bi-directional drive circuits. The key features of the UC1638 include a programmable high speed triangle oscillator, a 5X differential current sensing amplifier, high slew rate error amplifier, high speed PWM comparators, and two 50mA open collector as well as two ±500mA totem pole output stages. This controller is specified for higher performance applications, yet maintains flexibility.
The UNITRODE UC1638 family of integrated circuits are advanced pulse width modulators intended for PWM motor drive and amplifier applications requiring either uni-directional or bi-directional drive circuits. Similar in architecture to the UC1637, 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.
Key features include a programmable high speed triangle oscillator, a 5X differential current sensing amplifier, a high slew rate error amplifier, high speed PWM comparators, and two 50mA open collector as well as two +500mA totem pole output stages. The individual circuit blocks are designed to provide practical operation to switching frequencies of 500kHz.
| Supply Voltage VCC (referenced to VEE) | 40V |
|---|---|
| Output Drivers (AOUT2, BOUT2) Currents (continuous) | +0.25A |
| Output Drivers (AOUT2, BOUT2) Currents (peak) | +500mA |
| Output Voltage (AQUT1, BOUT1) | 60V |
| Storage temperature | -65°C to +150°C |
| Junction Temperature | -55°C to +150°C |
| Overall Supply Current, Operating | 15 23 mA |
| Voltage Amplifier Open Loop Gain | 75 100 dB |
| Oscillator Initial Accuracy | 86 98 110 kHz |
| 5V Reference Output Voltage | 4.925 5 5.075 Vv |
The UC1638 operates from -55°C to +125°C, the UC2638 from -25°C to +85°C, and the UC3638 from 0°C to +70°C.
The individual circuit blocks are designed to provide practical operation to switching frequencies of 500kHz.