Regulating Pulse Width Modulators

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

The LT1525A and LT1527A are improved general purpose switching regulator control circuits. Included on the chip are a trimmed 1% voltage subsurface zener reference, oscillator, comparator and high current class B totem pole output drivers. Included in the design of the LT1525A are easy synchronization to an external clock, soft-start and adjustable deadtime control. A shutdown pin allows instantaneous shutdown.

The LT1525A and LT1527A differ only in their output logic phasing. The LT1525A has a low output during the "off" state, while the LT1527A has a high output during the "off" state. Both devices have undervoltage lockout with about 0.5V hysteresis, giving reliable operation even with slowly varying supplies.

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

Applications

* Switching Power Supplies

* Motor Speed Control

* Power Converters

* Undervoltage Lockout with Hysteresis

* Guaranteed 1% 5.1V Reference

* Guaranteed 10mV/1000 Hr Long Term Stability

* Latching PWM