ST ISA014V1 User Manual

VIPer12A travel adaptor 3.6W output
Features
Switch mode general purpose power supply
Output: 6V @ 600mA
Output power : 3.6W
Switching frequency 60kHz
Current mode control
65% efficiency
9V to 40V wide range VDD voltage
Auxiliary undervoltage lockout with hysteresis
High voltage start up current source
Overtemperature, overcurrent and overvoltage
protection.
Reference design genaral description
STEVAL-ISA014V1
Data Brief
STEVAL-ISA014V1
ST Components
VIPer12AS
SMBY01-200
The travel adaptor design presented here has been made with the aim of minimizing overall cost for a secondary voltage and current regulated adapter topology widely used in cellular phone adapters. Thanks to the VIPer12A low power consumption, it is possible to achieve 100mW standby power in a wide range of operations, as recommended by the "European Comm ission of Energy".
March 2006 Rev 1 1/5
For further information contact your local STMicroelectronics sales office
www.st.com
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General circuit description STEVAL-ISA014V1

1 General circuit desc ript ion

The circuit is a standard fly-back converter with secondary current and voltage regulation driving the VIPer12A feedback pin through an optocoupler.
The power losses are distributed at 6V / 600mA output power as follows:
400mW in the output diode
700mW in the VIPer12A
300mW in the transformer
380mW in the shunt resistor
Overall efficiency is 67%. If the losses in the shunt resistor are considered as available power, the converter efficiency
becomes 74%. This is possible by using a secondary controller like ST's TSM101. In standby, the demo board consumes less than 100mW at 100Vdc and 120mW at 380Vdc. The major contribution to the standby consumption is the VIPer12A own consumption and is
independent from input voltage.
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STEVAL-ISA014V1 Board schematic

2 Board schematic

Figure 1. Schem e
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Revision histo ry STEVAL-ISA014V1

3 Revision history

Table 1. Revision history
Date Revision Changes
23-Mar-2006 1 Initial release.
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