UC3524A - 高级稳压脉宽调制器

UC3524A是TI德州仪器公司的一款PWM与谐振控制器产品，UC3524A是高级稳压脉宽调制器，本站介绍了UC3524A的封装应用图解、特点和优点、功能等，并给出了与UC3524A相关的TI元器件型号供参考。

UC3524A - 高级稳压脉宽调制器 - PWM与谐振控制器 - 离线隔离型DC/DC控制器和转换器 - 德州仪器

产品描述

The UC1524A family of regulating PWM ICs has been designed to retain the same highly versatile architecture of the industry standard UC1524 (SG1524) while offering substantial improvements to many of its limitations. The UC1524A is pin compatible with "non-A" models and in most existing applications can be directly interchanged with no effect on power supply performance. Using the UC1524A, however, frees the designer from many concerns which typically had required additional circuitry to solve.

The UC1524A 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 UC1524A is an under-voltage lockout circuit which disables all the internal circuitry, except the reference, until the input voltage has risen to 8V. This holds standby current low until turn-on, greatly simplifying the design of low power, off-line supplies. The turn-on circuit has approximately 600mV of hysteresis for jitter-free activation.

Other product enhancements included in the UC1524A’s design include a PWM latch which insures freedom from multiple pulsing within a period, even in noisy environments, logic to eliminate double pulsing on a single output, a 200ns external shutdown capability, and automatic thermal protection from excessive chip temperature. The oscillator circuit of the UC1524A is usable beyond 500kHz and is now easier to synchronize with an external clock pulse.

The UC1524A is packaged in a hermetic 16-pin DIP and is rated for operation from -55°C to +125°C. The UC2524A and 3524A are available in either ceramic or plastic packages and are rated for operation from -25°C to +85°C and 0°C to 70°C, respectively. Surface mount devices are also available.

产品特性

Fully Interchangeable with Standard UC1524 Family
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
Output Current to 200mA
60V Output Capability
Wide Common-Mode Input Range for both Error and Current Limit Amplifiers
PWM Latch Insures Single Pulse per Period
Double Pulse Suppression Logic
200ns Shutdown through PWM Latch
Guaranteed Frequency Accuracy
Thermal Shutdown Protection

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