UC2526

Regulating Pulse Width Modulator UC1526 UC2526 UC3526 FEATURES 8 To 35V Operation 5V Reference Trimmed To ±1% 1Hz To 400kHz Oscillator Range Dual 100mA Source/Sink Outputs Digital Current Limiting Double Pulse Suppression Programmable Deadtime Under-Voltage Lockout Single Pulse Metering Programmable Soft-Start Wide Current Limit Common Mode Range TTL/CMOS Compatible 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 compensated 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 compatible. 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 milita...