Regulating Pulse Width Modulator

OBSOLETE: For Information Purposes Only. Contact Analog Devices for Potential Replacement.

The LT1526 is an improved general purpose switching regulator control circuit. Included on the chip are a 1% voltage reference, oscillator, error amplifier, pulse width modulator and low impedance output drivers. Also included are protective features such as a current limit comparator, undervoltage lockout, soft-start circuitry, and adjustable deadtime. This versatile device can be used to implement single-ended or push-pull switching regulators of either polarity, both transformerless and transformer-coupled.

Although pin-for-pin and functionally compatible with industry standard 1526 and 3526 devices, we have incorporated several improvements in the design of the LT1526. A subsurface zener has been used to provide excellent reference voltage stability and the reference offers improved line regulation and load regulation. The current limit comparator sense voltage initial accuracy and temperature stability have been greatly improved.

The combination of improved features and advanced linear processing for high reliability make our switching regulators a superior choice.

Applications

* Switching Power Supplies

* Motor Speed Control

* Power Converters

* 8V to 35V Operation

* Guaranteed ±1% 5V Reference

* Guaranteed 10mV/1000 Hrs. Long Term Stability