Product description
Regulating Pulse Width Modulator
The UC3526 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.
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
The UC3526 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.
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