EPR-000014 Datasheet, PDF (11/28 Pages) Power Integrations, Inc. – Engineering Prototype Report - 3 W Universal Input TinySwitch-II TNY264 Power Supply

22-Feb-2002
EPR-000014 – 9 V, 0.33 A, 3 W TNY264 Adapter
8.2 Efficiency
Efficiency data was collected at full load while varying the AC input, 50 Hz line
frequency. Thermal stabilization was verified. Data represents worst-case efficiency in
high frequency operating mode. Due to capacitive switching losses, high voltage
efficiency is reduced in high frequency mode (132 kHz).
Efficiency
78.0%
76.0%
74.0%
72.0%
70.0%
68.0%
85
135
185
235
Input Voltage (VAC)
Figure 5. Supply Efficiency vs Line Voltage
8.3 Standby Power Consumption
Standby power was measured with output load disconnected utilizing a high resolution
AC wattmeter after the supply had thermally stabilized
Standby Power Loss
0.25
0.2
0.15
0.1
0.05
0
75
95
115
135
155
175
195
215
235
255
275
Input VAC
Figure 6. Supply Standby Power vs Line Voltage
Page 11 of 28
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