EPR-00015 Datasheet, PDF (3/24 Pages) Power Integrations, Inc. – 3W, Universal Input, Single Output, Isolated Converter with TNY254 (EP-15)

Engineering Prototype Report
1.0 Introduction
This document presents the specification, schematic & BOM, transformer design, test data, wave forms and
EMI scan for a low cost, isolated converter (EP15) for low current battery charging applications (long
charging time, NiCd). A typical application is illustrated in Figure 1.1.
The unit has low input voltage detection circuit, programmable for 110 or 220Vac operation.
When the line voltage drops below the threshold, the battery energizes the inverter and the lamp turns on.
When the line voltage exceeds the threshold, the battery is disconnected from the inverter, the lamp turns off
and the battery is recharged.
The EP15 output voltage can be reduced, while maintaining the same charging current (reduced power).
The EP15 is designed to meet the industry’s safety and EMI standards.
Current setting resistor
L
Relay(NC)
Power Supply EP15
Battery
N
Figure 1.1. Battery charger block diagram.
Inverter
NEON LAMP
2.0 Power Supply Requirements Specification
Description
Input
Operating Input Voltage
No load input power
Output
Output Voltage**
Output Ripple Voltage
Output Current ***
Power Output
Continuous Output Power
Power supply efficiency
Environmental
Temperature
Safety
Surge (differential, 2 ohm)
Surge (common mode, 12 ohm)
EMI-Conducted
Symbol
Vin
Vout
Vout ripple
Iout
Pout
h
Tamb
Line-Line
Line-Earth
Min Typ
85*
12
0.25
3
75
0 25
1
2
Max
265
250
200
50
Units Comment
Vac 50/60Hz
mW @ 230Vac
Green LED indicator
Vdc +/-6% Total
mV Peak to Peak
A
W
@ Full Load
%
@ Full Load
°C
IEC950/UL1950
kV IEC/UL 1000-4-5 Class 3
kV IEC/UL 1000-4-5 Class 3
CISPR22B
*Under voltage lockout threshold set/programmable with a voltage divider
(100Vac for universal input, 175Vac for single voltage input 230Vac).
**Can be adjusted by changing the output Zener diode VR1.
***The maximum short circuit current is 0.94A
EPR-00015
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