UC3524AN .

The UC3524AN is an Advanced Regulating Pulse Width Modulator designed to retain the same highly versatile architecture of the industry standard UC3524 (SG3524) while offering substantial improvements to many of its limitations. The UC3524A is pin compatible with "non-A" models and in most existing applications can be directly interchanged with no effect on power supply performance. It includes a precise 5V reference trimmed to ±1% accuracy, eliminating the need for potentiometer adjustments, an error amplifier with an input range which includes 5V, eliminating the need for a reference divider, a current sense amplifier useful in either the ground or power supply output lines and a pair of 60V, 200mA uncommitted transistor switches which greatly enhance output versatility. An additional feature of the UC3524A is an under-voltage lockout circuit which disables all the internal circuitry, except the reference, until the input voltage has risen to 8V.

• Precision reference internally trimmed to ±1%
• High-performance current limit function
• Under-voltage lockout with hysteretic turn-on
• Start-up supply current less than 4mA
• Wide common-mode input range for both error and current limit amplifier
• PWM latch insures single pulse per period
• Double pulse suppression logic
• 200ns Shutdown through PWM latch
• Guaranteed frequency accuracy
• Thermal shutdown protection
• Green product and no Sb/Br

Applications

Power Management