AN2744 datasheet(42/56 Pages) STMICROELECTRONICS

42 / 56 page

Board description

AN2744

42/56

5.7

Power supply

The ST7538Q dual channel reference design includes a specifically designed switching

mode power supply circuit, based on ST’s VIPer12AS-E device.

VIPer12AS-E is a smart power device with current mode PWM controller, startup circuit and

protections integrated in a monolithic chip using VIPower M0 technology. It includes a 27

Mosfet with 730 V breakdown voltage and a 400 mA peak drain current limitation. The

switching frequency is internally fixed to 60 kHz, in order to provide a good compromise

between EMI performances and magnetic parts dimensioning.

The internal control circuit offers the following benefits:

- large input voltage range on VDD pin accommodates changes in supply voltage

- automatic burst mode in low load condition

- overload and short circuit protection in hiccup mode

The power supply is designed in isolated flyback configuration with secondary regulation by

means of an optocoupler and a Zener diode, considering the requested output tolerance for

the specified application.

The main specifications are listed in Table 10

In the input stage, an EMI filter is implemented (C2, L2, C10, L3, C5) for both differential and

common mode noise, in order to fit the requested standard.

Table 8.

50-pin connector control signals

Pin n°

Signal name

Description

Generated by

B_ID_PLM_1

Board ID for PLM Applications (MSB)

PLC Board

B_ID_PLM_0

Board ID for PLM Applications (LSB)

PLC Board

VDDF_FORCE

Force µC digital level to VDDF

PLC Board

Table 9.

50-pin connector power connections

Pin n°

Signal name

Description

Generated by

PLM_10V

10V power supply

PLC Board

VDD

3.3V/5V power supply

ST7538Q

VDDF

Digital power supply

ST7538Q

22,34

GND

Ground

Table 10.

SMPS specifications

Parameter

Value

Input voltage range, VIN

85-265 VAC

Output voltage, VOUT

10V±10%

Peak output current, IOUT(MAX)

600 mA

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