EPR-9 Datasheet, PDF (3/32 Pages) Power Integrations, Inc. – Engineering Prototype Report 5 W, Universal Input, Dual Output, Isolated, TNY266 (EP9)

03-April-2001
5 W Universal Input Dual Output Isolated TNY266
1 Introduction
This document presents the specification, schematic & BOM, transformer design, test data, waveforms and
EMI scan for a low cost, dual output (5 V_DC, 12 V_DC), isolated converter for a home appliance application.
The unit has to operate up to 85 °C ambient and to ride through input voltage surges up to 2 kV (config. ”1”)
or to 6 kV (config. ”2”).
The unit is also designed to meet the industry safety and EMI standards. The EMI standard is met with a
low cost transformer (without shield winding and flux band) and low cost input filter (no common mode
choke).
There are different input voltage surge withstand requirements depending upon the geographical area the
white goods are built for. The power supply designer has to choose the level of protection, the voltage level
and the number of surges the unit must survive.
For applications with elevated ambient temperature requiring full power, the heat sink (included in the kit)
has to be soldered to the board in the slot next to U1.
The board is accompanied by a kit that includes a copper heat sink (Fig. 5.2) and the input voltage surge
protection components (R7, R8, RV1) for 6 kV (config. ”2”) protection.
For applications requiring 5 V_DC and 24 V_DC, a schematic, BOM and transformer spreadsheet is included in
Appendix A.
2 Power Supply Requirements Specification
Description
Input
Input Voltage
Output
Output 1 Voltage
Output 1 Ripple Voltage
Output 1 Current
Output 2 Voltage
Output 2 Ripple Voltage
Output 2 Current
Power Output
Continuous Output Power
Power supply efficiency
Environmental
Temperature
Input Surge Voltage Withstand
Safety
EMI-Conducted
Symbol Min Typ
V_AC
85
V_{DC OUT}
V_{OUT RIPPLE}
I_OUT
V_{DC OUT}
V_{OUT RIPPLE}
I_OUT
10.2
20
4.75
20
12
100
5
40
P_OUT
0.3
0.3
η
55
T_AMB
0
config.”1” ±2
config.”2” ±6
Max
265
13.8
150
200
5.25
50
500
2.8
5.0
85**
Units
Comment
V_AC
50/60 Hz
V
(12 V±15%)
mV
@ full load
mA
V
(-5 V±5%)
mV
@ full load
mA
W 85° C ambient* inside box
W 50° C ambient* inside box
%
@ low line, full load
°C 6”x6”x4” sealed enclosure
kV IEC1000-4-5 (1.2/50 µs)
kV IEC1000-4-5 (1.2/50 µs)
IEC950
CISPR22B ***
*The unit was placed in a 6” x 6” x 4” sealed box inside the temperature chamber.
**See Paragraph 4.0.
*** FCC accepts CISPR22B @ 115 V_AC in place of FCC limit.
Page 3 of 32
Power Integrations, Inc.
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www.powerint.com