23-April-2001
EPR-000008 – 1.2 W Universal Input Non-Isolated TNY254
1 Introduction
There are three specific requirements for this power supply:
1. To provide power for driving a trial requires that the output power be referenced to the
input line (L), with no series impedance, therefore only ½ wave rectification is allowed
and the switch must be in the return side of the primary switching circuit. EMI filtering, if
necessary, has to be implemented at the system level.
2. The unit has to operate at 85 LC ambient.
3. The unit has to withstand 2 kV (configuration “1”, page 4) and 6 kV (configuration ”2”,
page 5) input surge voltage as defined by IEC 1000-4-5 (1.2/50 ꢀs). The surge protection
added to satisfy these requirements reduces the converter efficiency. It would be more
beneficial (lower cost, improved efficiency) if the surge protection were implemented at
the system (appliance) level.
2 Power Supply Specification
The specification below is for the worst case (6 kV configuration ”2”)
Description
Symbol
Min
Typ
Max
Units
Comment
Input
50/60 Hz
Input Voltage
Input frequency
Output
VAC
85
47
265
63
VAC
Hz
fLINE
Output Voltage
Output Ripple Voltage
Output Current
Load Regulation
Line Regulation
Power Output
VOUT
VRIPPLE
IOUT
10.8
0
12
80
13.2
120
100
V
12 V+/-10%*
MV
MA
of VOUT @ full load
~200 mA short
0-100% load
85-265 VAC, full load
Continuous Output power POUT
0
1.2
85
W
0-85 LC internal
ambient**
Power supply efficiency
50
0
%
C
@low line, full load
ꢀ
Environmental
Temperature
TAMB
6” x 6” x 4” enclosure
Designed to meet
CISPRR 22B (FCCB)
Designed to meet IEC950
IEC1000-4-5
EMI – conducted
Safety
Input Surge Voltage
Input Surge Voltage
Config. ”1”
Config. ”2”
2
6
kV
kV
IEC1000-4-5
* +/-5% with 2% Zener.
**The unit was placed in a 6” x 6” x 4” enclosure inside the temperature chamber.
Power Integrations, Inc.
Page 3 of 20
Tel: +1 408 414 9200 Fax: +1 408 414 9201
www.powerint.com
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