EPR-00010 Datasheet, PDF (3/24 Pages) Power Integrations, Inc. – 15W, Universal Input, Single Output, Isolated Converter with TOP233Y

Engineering Prototype Report
1.0 Introduction
This document presents the specification, schematic & BOM, transformer calculation, test data, wave forms
and EMI scan for a low cost, isolated converter for a battery charger application. The converter is designed
with TOP233Y(TOPSwitch-FX family) which brings the following benefits at no extra cost:
-low component stress (soft start)
-overload protection (auto-restart)
-remote ON/OFF(computer interface; not used in the current design)
-undervoltage and overvoltage protection (lockout -UVLO/OVLO)
-over-temperature protection (hysteretic thermal shutdown)
-energy saving (cycle skipping at low load)
-EMI standard met with a low cost transformer, without shield winding and flux band (frequency jitter).
-small size magnetics (132kHz switching frequency)
-high efficiency (73% max. duty cycle and reduced-programmable current limit; not used in the current design)
2.0 Power Supply Requirements Specification
Description
Input
Normal Operating Input Voltage
Abnormal Input Voltage*
No load input power
Output
Output Voltage**
Output Ripple Voltage
Output Current Limit***
Power Output
Continuous Output Power****
Power supply efficiency
Environmental
Temperature
Safety
Surge (differential, 2 ohm)
Surge (common mode, 12 ohm)
EMI-Conducted *****
Symbol
Vin
Vin
Vout
Vout ripple
Iout
Pout
h
Tamb
Line-Line
Line-Earth
Min Typ Max Units Comment
85
14
0.02
265 Vac
300 Vac
390 mW
Vdc
200 mV
1.2 A
50/60Hz
50/60Hz
Vin=265Vac, 60Hz
Green LED indicator
+/-5% Total
Peak to Peak
15
W
@ Full Load
75
%
@ Full Load
0
50 °C
IEC950/UL1950
1
kV IEC/UL 1000-4-5 Class 3
2
kV IEC/UL 1000-4-5 Class 3
CISPR22B
*Under voltage lockout: Power supply ON@ >70Vac, OFF@ <50Vac & loss of regulation (load dependent).
Over voltage lockout: Power supply OFF @ >307Vac and back ON @ <290Vac.
**Can be adjusted by changing the U3-1voltage (TL431).
Battery charging voltage temperature compensation input available for external thermistor, NTC.
(Floating/trickle charge: -3.9mV/degC; -20mV/degC and –30mV/degC are also common).
***Current limit set/programmable with a sense resistor.
****Power output derated if no heat sink is used at Tamb >40degC.
***** Output load not grounded
EPR-00010
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