UC1526
UC2526
UC3526 Regulating Pulse Width Modulator
FEATURES DESCRIPTION 8 To 35V Operation 5V Reference Trimmed To В±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 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 military
temperature range of -55В°C to +125В°C. The UC2526 is characterized
for operation from -25В°C to +85В°C, and the UC3526 is characterized
for operation from 0В° to +70В°C. Symmetry Correction Capability Guaranteed 6 Unit Synchronization BLOCK DIAGRAM 6/93 UC1526
UC2526
UC3526
ABSOLUTE MAXIMUM RATINGS (Note 1, 2) RECOMMENDED OPERATING CONDITIONS (Note 3) Input Voltage (+VIN) +40V
Collector Supply Voltage (+VC) . +40V
Logic Inputs . -0.3V to +5.5V
Analog Inputs . -0.3V to +VIN
Source/Sink Load Current (each output) . 200mA …
