UC1526 Datasheet | Unitrode

FEATURES - 8 To 35V Operation - 5V Reference Trimmed To ±1% - 1Hz To 400k Hz Oscillator Range - Dual 100m A Source/Sink Outputs - Digital Current Limiting - Double Pulse Suppression - Programmable Deadtime - Under-Voltage Lockout - Single Pulse Metering - Programmable Soft-Start - Wide Current Limit mon Mode Range - TTL/CMOS patible Logic Ports - Symmetry Correction Capability - Guaranteed 6 Unit Synchronization DESCRIPTION The UC1526 is a high performance monolithic pulse width modulator circuit designed for fixed-frequency switching regulators and other power control applications. Included in an 18-pin dual-in-line package are a temperature pensated voltage reference, sawtooth oscillator, error amplifier, pulse width modulator, pulse metering and setting logic, and two low impedance power drivers. Also included are protective features such as soft-start and under-voltage lockout, digital current limiting, double pulse inhibit, a data latch for single pulse metering, adjustable deadtime, and provision for symmetry correction inputs. For ease of interface, all digital control ports are TTL and B-series CMOS patible. Active LOW logic design allows wired-OR connections for maximum flexibility. This versatile device can be used to implement single-ended or push-pull switching regulators of either polarity, both transformerless and transformer coupled. The UC1526 is characterized for operation over the full military temperature range of -55°C to +125°C. The UC2526 is characterized for operation from -25°C to +85°C, and the UC3526 is characterized for operation from 0° to +70°C. BLOCK DIAGRAM 6/93 ABSOLUTE MAXIMUM RATINGS (Note 1, 2) Input Voltage (+VIN) - - - - - - +40V Collector Supply Voltage (+VC) - - - - . +40V Logic Inputs - - - - - . . . . -0.3V to +5.5V Analog Inputs - - - - - . . . . -0.3V to +VIN...