STEVAL-ISA006V1 [STMICROELECTRONICS]

6W Non-isolated fly-back topology power supply with VIPer12AS; 6W非隔离带VIPer12AS回扫拓扑结构电源


型号：	STEVAL-ISA006V1
厂家：	ST
描述：	6W Non-isolated fly-back topology power supply with VIPer12AS 6W非隔离带VIPer12AS回扫拓扑结构电源
文件：	总5页 (文件大小：122K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

STEVAL-ISA006V1

6W Non-isolated fly-back topology power supply

with VIPer12AS

Data Brief

Features

■ Switch mode general purpose power supply

■ Input: 90 to 264Vac @ 50/60Hz

■ Main Output (regulated): 5V, 500mA @ 50/

60Hz

■ Second output: 15V, 200mA

■ Output power (pick): 5.5W

Reference design genaral

description

STEVAL-ISA006V1

This reference design is an auxiliary power supply

based on the VIPer12AS monolithic device and

can be used to produce multiple non isolated

positive or negative voltage outputs.

ST Components

■ VIPer12AS off-line SMPS primary

This solution is based on an offline discontinuous

current mode fly-back converter without isolation

between input and output. The fly-back topology

allows the exploitation of the VIPer12AS current

capability when compared with the buck converter

based power supply. To ensure power supply low

cost, the isolation between input and output is not

provided. This greatly simplifies the transformer

design and production. The VIPer12AS

■ STPR120A diode, fast recovery trr =25ns 200V

1A SMA

■ STPS1L40A diode, schottky, 40V 1A,

■ TS2431ILT programmable shunt voltage

reference

incorporates the PWM controller with a 60kHz

internal oscillator and the vertical Power MOSFET

switch in a SO-8 package. The presented power

supply has four variants. All the variants have

been incorporated in the presented reference

board through different assembly options.

March 2006

Rev 1

1/5

For further information contact your local STMicroelectronics sales office

www.st.com

General circuit description

STEVAL-ISA006V1

General circuit description

The output of the converter is not isolated from the input. For this reason the reference ground

is common for an input and output connection terminal. The input capacitor C1 is charged from

the mains by single rectification consisting of diodes D1 and D2. Two diodes in series are used

for EMI reasons to sustain burst pulses of 2kV. Capacitor C1 together with capacitor C2 and

inductor L1 form an EMI filter. The DC voltage at C2 is then applied to the transformer primary

winding through the internal Power MOSFET switch of VIPer12 during the switching period ON

time. The snubber circuit consisting of resistor R3 and capacitor C6 reduces the voltage spike

across the transformer primary winding due to the parasitic leakage inductance. Through

rectifiers D4 and D5 and through smoothing capacitors C3 and C4, the power supply provides

two outputs from two transformer windings. The VIPer12AS is supplied by a 15V output voltage

through transistor Q2 and diode D7. The voltage feedback loop senses the 5V output through

resistor divider R5, R7. The control IC U2 compares the resistor divider output voltage to the

internal reference voltage of 2.5V and changes the cathode voltage accordingly to keep 5V

output stable. The FB pin current will decrease the peak primary current to reduce the power

delivered to the outputs.

2/5

STEVAL-ISA006V1

Board Schematic

Figure 1. Scheme

3/5

Revision history

STEVAL-ISA006V1

Revision history

Table 1.

Date

Revision history

Revision

Changes

23-Mar-2006

Initial release.

4/5

STEVAL-ISA006V1

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5/5

STEVAL-ISA006V1 [STMICROELECTRONICS]

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