Introduction present board prototype wide-range input off-line single

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Introduction present board prototype wide-range input off-line single

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OFF-LINE SMPS USING VIPer100
Introduction present board prototype wide-range input off-line single switch Flyback, working kHz. based off-line smart switcher VIPer100. Figure Standard Demoboard ORDER CODE: VIPERKITBD
VIPer100 current mode with 620V power switch, able withstand avalanche current during normal operation. start circuit done with internal high voltage current source, which switched during steady state. also includes regulation function designed minimize count, while maintaining design flexibility. Figure presents internal block diagram this monolithic device. Such device easily used off-line Flyback SMPS, with power capability single input voltage range, with wide input range. This stand-alone off-line Smart Switcher concept provides cost effective solution SMPS many applications like VCR, sets, satellite receivers decoders. benefits customer simpler design phase reduced overall components count optimization product configuration.
AN1094/1198
VIPer100 major features Adjustable Switching Frequency kHz; Optimized Current Mode Control Topology; Inherent Feedforward Compensation; Soft -Start Enable Function; Overcurrent Protection; Overtemperature protection; Overvoltage Protection; Undervoltage Lock-out With Hysteresis; stand-by current; Integrated Start-up supply; Automatic Burst Mode Operation stand-by condition; Internally trimmed BANDGAP reference. Figure Block Diagram
DRAIN
ON/OFF OSCILLATOR SECURITY LATCH
LATCH
UVLO LOGIC
OVERTEMP. DETECTOR 0.5V
ERROR AMPLIFIER
DELAY
BLANKING
CURRENT AMPLIFIER
COMP
SOURCE
FC00231
VIPer100 description This level supply device. start delivers charging current. also connected inverted input error amplifier. connected external network switching frequency. Comp control device. voltage sets peak current power switch, output error amplifier. this amplifier transconductance one, compensation network that simply grounded. Drain Source power pins device. source also ground reference device compensation oscillation networks. Board Features Input Voltage Maximum output power output voltage Load Vout Operating frequency Par. gives complete schematics this line flyback converter. Feedback loop This demoboard allows user choose between primary secondary regulation. Primary regulation done through primary auxiliary winding which delivers level supply voltage device. This voltage represents also secondary output voltage, correctly filtered order avoid spikes beginning each phase. This mode running achieved putting strap position. Secondary regulation made with optocoupler directly from secondary output voltage. acts "COMP" pin, auxiliary winding delivering level supply voltage lower value than when primary regulation configuration, thanks internal error amplifier consequently saturated high state, sourcing constant current about "COMP" pin. address this configuration, just straps position. case, strap position must always present. Special operations limitation been VIPer device. This limitation implemented "COMP" with zener multiplier, whatever else able clamp voltage this about this specific case clamping demoboard able deliver 130W power, continuous running. This operation must last more than seconds. Nevertheless, demoboard fully protected against short circuits. This type condition leads burst operation, with peak current output. burst duty cycle, rather low, risk exists this situation experienced indefinitely. board withstands load condition. attention that primary regulation, output voltage will rise about Secondary regulation provide better behavior maintaining output voltage about also lowest consumption main lines less than watt input voltage.
Schematics board layout Figure Printed Board Copper side (Scale 1:1)
Figure Printed Board Components side (Scale 1:1)
INDUCTOR 3.9k
1.6A
600V, INDUCTOR 100nF 400V DIODE BZX55C11V 3.9k
CON2
100nF 400V
B82731-R2801-A30 SIEMENS
Figure Demoboard Schematics
100uF 400V 10543330-P1 OREGA BYW81P150
DIODE ZENER
POT1 1000uF CON2
1000uF
DRAIN JUMPER
1N4448 VIPer100 COMP 4.7n 5.1k 4.7nF 100nF SOURCE 22uF
3.9k
ISO1 4N25
Component List
DEVICE ISO1 POT1 PITCH (mm) TYPE 0,1µF 400V 100µF 400V 0,1µF 400V 1000µF 1000µF 400V 22µF 4,7nF 4.7nF 100nF 1A/600V BYT11-400 BYW81/100 BZW50-180 BZX55C10 GREEN 1N4448 FUSE 4N25 2contacts screw connector 2contacts screw connector 100uH inductor B82731-R2801-A30 100uH inductor OREGA 10543330-PI DESCRIPTION Film Electrolitic,high voltage,high temp Film Electrolitic, Electrolitic, Ceramic high voltage ClassY Electrolitic Film,WYMA Ceramic Ceramic diodes bridge
Zener
rated (**) rated turn,horizontal,miniature 0,25 0,25 0,25 0,25 0,25 0,25 0,25
specifically developed from OREGA (THOMSON TELEVISION COMPONENT FRANCE) this demoboard. (**) SIEMENS MATSUSHITA component.
Information furnished believed accurate reliable. However, STMicroelectronics assumes responsibility consequences such information infringement patents other rights third parties which results from use. license granted implication otherwise under patent patent rights STMicroelectronics. Specifications mentioned this publication subject change without notice. This publication supersedes replaces information previously supplied. STMicroelectronics products authorized critical components life support devices systems without express written approval STMicroelectronics. logo registered trademark STMicroelectronics 1998 STMicroelectronics Printed ITALY- Rights Reserved. STMicroelectronics GROUP COMPANIES Australia Brazil Canada China France Germany Italy Japan Korea Malaysia Malta Mexico Morocco Netherlands Singapore Spain Sweden Switzerland Taiwan Thailand United Kingdom U.S.A. http://www.st.com

Introduction present board prototype wide-range input off-line single

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