LNK501
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Design Idea DI-60 LinkSwitch Cost
Regulated Charger/Adapter
Application Charger/Adapter Device LNK501 Power Output Input Voltage 85-265 Output Voltage Topology Flyback
Design Highlights
Replaces linear transformer based power supply same lower cost, with better output regulation No-load input power consumption input: meets worldwide energy conservation guidelines Extremely simple circuit requires only components! Output voltage (CV) tolerance: ±10% peak power point Output current (CC) tolerance: ±25% when ±10% Features short-circuit, open loop thermal protection Typically about efficient! Meets EN550022 without Safety capacitor Ultra-low leakage current: input
bias/feedback winding (T1, pins 3-4) provides with CONTROL current. mode, that current controlled U2-phototransistor. start-up mode, when OFF, provides current path. Diode return winding, making shield core from primary winding. bias winding primary-tosecondary shield winding (T1, both reduce EMI. Resistor reduce EMI. CONTROL capacitor stores energy supplies back start-up, determines "restart attempt rate" auto-restart mode, shunts high frequency switching noise around provides with instantaneous MOSFET gate-drive current requires. combined voltages VR1, U2-LED determine output voltage. Resistor provides bias current VR1. output voltage fine-tuned adjusting values LinkSwitch solutions must only operate discontinuous conduction mode. I2f, where Output Power, transformer primary inductance, LinkSwitch peak current, Switching frequency Efficiency. accurately controlled LinkSwitch; therefore, proportional
Operation
Fusible resistor gives short-circuit fault protection limits start-up inrush current. Inductors capacitors form low-cost filter that attenuates conducted EMI. Transformer (T1) winding phasing orientation secondary winding current flow when U1-MOSFET primary winding current stores energy core When U1-MOSFET turns OFF, energy stored drives current secondary winding, forward biasing charging developing/maintaining output voltage across network clamps flyback voltage across primary winding, U1-MOSFET turns OFF.
D1-D4 1N4005
EE13 2.36
11DQ06
0.45
114T 1N4007G PC817A
PC817A
LinkSwitch LNK501
Ferrite Bead
BAV20
PI-3695-103103
Figure LinkSwitch Based Charger/Adapter.
DI-60
www.powerint.com
December 2004
DI-60
Typical applications chargers cell phones, PDAs, portable audio devices shavers power sources embedded within home appliances consumer electronics, such standby bias supplies.
Input Power (mW)
Design Points
within being optimum) Transformer primary inductance tolerance must ±10%, maintain limit tolerances (±25/20%) allow more time reaching regulation startup into fully resistive load), increase battery voltage less than then LinkSwitch will come auto-restart mode lower ripple voltage into non-battery loads, filter must added onto output
Input Voltage (VAC)
Figure Load Input Power Consumption.
PI-3696-091003
TRANSFORMER PARAMETERS
Core Material Bobbin PC40 EE13, nH/T2 EE13 Horizontal Bias: 39T, Primary: 114T, Shield: 13.5T, Secondary: 12T, (TIW) Bias (4-3), tape, Primary (2-1), tape, Shield (1-open), tape, Secondary (6-5), tape 2.36 ±10% (minimum)
Output Voltage
Limit High Limit
Winding Details
Winding Order (pin numbers)
Primary Inductance Primary Resonant Frequency
Output Current
Figure Load Regulation-CV/CC Characteristics.
Table Transformer Construction Information.
latest updates, visit www.powerint.com Power Integrations make changes products time. Power Integrations liability arising from your information, device circuit described herein does convey license under patent rights rights others. POWER INTEGRATIONS MAKES WARRANTIES HEREIN SPECIFICALLY DISCLAIMS WARRANTIES INCLUDING, WITHOUT LIMITATION, IMPLIED WARRANTIES MERCHANTABILITY, FITNESS PARTICULAR PURPOSE, NON-INFRINGEMENT THIRD PARTY RIGHTS. products applications illustrated herein (including circuits external products transformer construction) covered more U.S. foreign patents potentially pending U.S. foreign patent applications assigned Power Integrations. complete list Power Integrations' patents found www.powerint.com. logo, TOPSwitch, TinySwitch, LinkSwitch, DPA-Switch EcoSmart registered trademarks Power Integrations. Expert FACTS trademarks Power Integrations. Copyright 2004, Power Integrations
Power Integrations
MAIN PHONE NUMBER 408-414-9200
12/04
5245 Hellyer Avenue
APPLICATIONS 408-414-9760
Jose, California 95138
complete listing worldwide sales offices, please visit www.powerint.com
APPLICATIONS HOTLINE 408-414-9660
www.powerint.com
PI-3697-091003
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