XC9516 Datasheet, PDF (8/26 Pages) Torex Semiconductor – Triple Output Power Supply for TFT-LCD

XC9516 Series
■TEST CIRCUITS (Continued)
< Circuit12 FB/FB1/FB2 Voltage Test>
< Circuit13 Maximum Duty Cycle>
FB Voltage Measurement: V_FB=1.1V→0.9V, V_FB is measured when L_X oscillation started.
FB1 Voltage Measurement: V_FB1=0.9V→1.1V, V_FB1 is measured when DRV1 oscillation started.
FB2 Voltage Measurement: V_FB2=1.1V→0.9V, V_FB2 is measured when DRV2 oscillation started.
Duty cycle of L_X oscillation is measured.
< Circuit14 FB/FB1/FB2 H/L Input Current>
< Circuit15 FB/FB1/FB2 Short Circuit Protection>
FB Input Current Measurement: Input Current is measured when FB Voltage is 5.5V/0V.
FB1 Input Current Measurement: Input Current is measured when FB1 Voltage is 5.5V/0V.
FB2 Input Current Measurement: Input Current is measured when FB2 Voltage is 5.5V/0V.
FB Short Protection Measurement: V_FB=0.9V→0.4V, V_FB is measured when V_FB oscillation stopped.
FB1 Short Protection Measurement: V_FB1=1.2V→2.8V, V_FB1 is measured when DRV1 oscillation stopped.
FB2 Short Protection Measurement: V_FB2=0.9V→0.4V, V_FB2 is measured when DRV2 oscillation stopped.
< Circuit16 Output Impedance 1/2>
< Circuit17 V_OUT Over Voltage Limit Measurement>
Output Impedance1: A load current of 20mA is applied to DRV1,
DRV1 voltage is measured when a load is applied or not applied R=V/0.02.
Output Impedance2: A load current of 20mA is applied to DRV2,
DRV2 voltage is measured when a load is applied or not applied R=V/0.02.
V_OUT=18V→22V, V_OUT is measured when L_x oscillation stopped.
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