PWM

SG3525 Datasheet – SG3525AN, PWM Controller – Motorola

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Part Number: SG3525, SG3525AN, SG3525ADW

Function : Pulse Width Modulator Control Circuit

Package:  N (DIP 16), DW (SMD 16) Type

Manufacturer: Motorola Inc

Image
sg3525-pwm-controller

Description

The SG3525A, SG3527A, SG3527AN pulse width modulator control circuits offer improved performance and lower external parts count when implemented for controlling all types of switching power supplies. The on–chip +5.1 V reference is trimmed to ±1% and the error amplifier has an input common–mode voltage range that includes the reference voltage, thus eliminating the need for external divider resistors.

 

Pinout

sg3525-datasheet-pinout

 

Features

1. 8.0 V to 35 V Operation

2. 5.1 V ± 1.0% Trimmed Reference

3. 100 Hz to 400 kHz Oscillator Range

4. Separate Oscillator Sync Pin

5. Adjustable Deadtime Control

6. Input Undervoltage Lockout

7. Latching PWM to Prevent Multiple Pulses

8. Pulse–by–Pulse Shutdown

9. Dual Source/Sink Outputs: ±400 mA Peak

 

sg3525-maximum-ratings

 

Reference Site: http://www.st.com/en/power-management/sg3525.html

 

SG3525 Datasheet


 

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JT3028 Datasheet – PWM Switching Power Supply Controller

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Part Number: JT3028, JT3028ON

Manufacturer: JINTEK

Package: SOP 8Pin, DIP 8 Pin

Function: High Performance Current Mode PWM Switching Power Supply Controller

Image:

JT3028 image

Description

JT3028ON is a highly integrated, high-performance the current-mode PWM controller chip. For electric
Source adapter and other small power switching power supply equipment.
In order to reduce standby power consumption, meet higher green Environmental standards, the chip provides a pulse mode (Burst Mode) function. That in light load or no load conditions Next, JT3028ON chip can reduce the linear opening Switching frequency, thus reducing loss of the switch, to obtain lower Standby power consumption, improve the conversion efficiency of the power system. By optimizing the design, JT3028ON with very low Starting current and operating current, not only conducive to start Circuit design, and start-up circuit can be used in a large resistance Value startup resistor to reduce standby power consumption, increase transfer Conversion efficiency.

JT3028  Datasheet

JT3028 Datasheet pinout