描述 Description

PWM IC specially designed for small and medium power supply solutions for power saving, can be used for Charger; Adaptor; DVD; Monitor.DVB below 24W

iPhone iPad. Multimedia Speaker etc.

Can effectively improve the output efficiency of general switching power supply circuits; reduce size; reduce parts; and meet the requirements of Energy Star EUP5.0 EPS2.0

Grid.LY952X adopts a number of power-saving technologies, and is designed with the lowest start-up current of 5uA, providing designers with the most ample space for design. Built-in complete protection circuits are integrated into one

Body: OCP; OLP; OVP; OTP; ESD.. and other technologies, and the built-in MOSFET simplifies the application design, makes the combined circuit more flexible, and achieves the most economical

With the most versatile control IC.

In the application note, the 12V/2A 24W single-output adapter will be taken as an example to illustrate how to achieve flexible changes in design and use.

The focus of the results. As shown in Figure 1-1, the 24W adapter circuit diagram designed by STGL semiconductor, we will discuss how to design and each

special applications on the market.

In discussing the design, we start with the circuit around the PIN pin of LY952X.

PIN 1 : GND is the ground pin of IC,

PIN 2: VDD-G is the driving power of the switching MOS tube

PIN 3 : VDD is IC power input pin.

PIN 4 : FB is the voltage feedback input pin, this pin is normally DC voltage, it is used to determine the current output status of PWM.

PIN 5 : SENSE is the current feedback input pin, built-in LEB(270nS) circuit,

PIN 6 7 8 : Drain is the drain terminal of the switching MOS tube