1

00:00:00,400 --> 00:00:01,300

Hello, everyone

2

00:00:01,300 --> 00:00:05,600

Today let's learn the switching power supply mode composed of power supply chips

3

00:00:11,033 --> 00:00:13,466

It uses a small power chip to convert,

4

00:00:13,466 --> 00:00:17,033

which is different from the switching power supply mode of MOS tube

5

00:00:22,566 --> 00:00:29,200

This type of power supply has limited current effect and most output currents do not exceed 3A

6

00:00:29,833 --> 00:00:31,400

Take the following diagram

7

00:00:31,800 --> 00:00:43,300

The chip U8030, PP3V3_S5, which converts the 3.3V of S5 state into the 3.3V of S0 state

8

00:00:45,400 --> 00:00:50,166

This VIN is the input pin, and VOUT is the output pin

9

00:00:50,733 --> 00:00:53,433

Its output current is about 1A

10

00:00:54,533 --> 00:00:56,033

Compared with MOS tube,

11

00:00:56,466 --> 00:01:01,100

this power supply mode does not need to meet the conduction conditions of G pole

12

00:01:03,700 --> 00:01:05,133

It has no G-pole

13

00:01:05,433 --> 00:01:08,233

It needs to meet the high level of enable signal

14

00:01:10,133 --> 00:01:14,300

The so-called high level does not specify how many volts it must have

15

00:01:15,300 --> 00:01:17,566

This depends on its chip data book

16

00:01:18,533 --> 00:01:25,833

For example, there is a PP3V3S0_EN on signal, valid at high level

17

00:01:26,366 --> 00:01:33,633

1V is also high, 2V is high, 3.3V is high, and 5V is also high

18

00:01:34,733 --> 00:01:39,833

Unlike the MOS tube, it must be limited to 4.5V or below

19

00:01:41,633 --> 00:01:46,666

As long as it is high level, it can convert VIN to VOUT

20

00:01:54,366 --> 00:01:59,200

Okay, so this is the switching power supply mode composed of power supply chips