VIPER53

As shown in the figure, a 12V/4A switching power supply with original side feedback designed by VIPer53 is applied, and its input voltage range is

165~265Vac, power supply operating frequency is 100kHz. The output voltage precision of this scheme is not very high, and the cost is low

The application of water.

FIG. 2 switching power supply of 12V/4A primary side feedback control composed of VIPer53

R1, C3 and D1, which are connected in parallel on the transformer's original side, are used as buffer circuits to eliminate the leakage sensation when the transformer's original side is turned off

The resulting peak voltage, D3, R4 and C4 constitute VIPer53 auxiliary power supply circuit, R2 and C5 constitute VIPer53

Oscillating network, stmicroelectronics provides a very convenient parameter configuration diagram, see figure 3. R3 and C6 make up a ratio

An integral compensation network is used to control the transient response speed of the system. When the output loop load changes, it flows through the fet

(MOSFET) current and internal reference to control the output duty cycle range change, so that the output voltage remains unchanged,

To stabilize the pressure.