EPR-91 Datasheet, PDF (21/36 Pages) Power Integrations, Inc. – Engineering Prototype Report for EP-91 - 12 W Power Supply using

7-Feb-2006
EP-91 12 V, 1 A, Universal Input Supply
9.5 Available Standby Output Power
The chart below shows the available output power versus line voltage at input power
consumption levels of 1, 2 and 3 watts (respectively). Again, this performance illustrates
the value of ON/OFF control, as it automatically maintains a high efficiency, even during
very light loading. This simplifies complying with standby requirements that specify that a
fair amount of power be available to the load at low input power consumption levels. The
TinySwitch-III ON/OFF control scheme maximizes the amount of output power available
to the load in standby operation when the allowable input power is fixed at a low value.
This simplifies the design of products such as printers, set-top boxes, DVD players, etc.
that must meet stringent standby power consumption requirements.
3
Pin=1 W
Pin=2 W
2.5
2.2 W for 3 W input at 230 VAC
Pin=3 W
2
1.4 W for 2 W input at 230 VAC
1.5
1
0.65 W for 1 W input at 230 VAC
0.5
0
85
105
125
145
165
185
205
225
245
265
285
Input Voltage (VAC)
Figure 9 – Available Output Power for 1, 2 and 3 Watts of Input Power.
Page 21 of 36
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