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NCP1562−100WGEVB
4. Configure Multimeter 2 (MM2) for measuring
voltage. Connect MM2 voltage measurement
terminal to evaluation board (Vout+) terminal.
Connect MM2 ground terminal to evaluation
board (Vout−) terminal.
5. Verify MM2 terminals are connected to evaluation
board terminals.
6. Connect electronic load (EL) to evaluation board
output. Connect EL (+) terminal to evaluation
board (Vout+) terminal. Connect EL (-) terminal to
evaluation board (Vout−) terminal. Set load current
(Iout) to 0 A.
7. Configure Multimeter 3 (MM3) for measuring
voltage. Connect MM3 voltage measurement
terminal to evaluation board (Vout+) terminal.
Connect MM3 ground terminal to evaluation
board (Vout−) terminal.
8. Verify MM3 terminals are connected to the
evaluation board terminals and not electronic load
terminals. Otherwise, the voltage drop on the EL
terminals will affect your measurements.
9. The complete test setup should be similar to
Figure 38.
10. Slowly ramp the input voltage (Vin) to 10 V. If
input current exceeds 30 mA, verify the setup. If
connection is correct, stop testing. Board needs to
be repaired.
11. Increase the input voltage to 25 V. The NCP1562
start-up circuit should be operating. Probe terminal
16 of U1. The waveform should look similar to
Figure 39. If not, stop testing. Board needs to be
repaired.
12. Increase the input voltage to 36 V. The evaluation
board output should be between 3.135 V and
3.465 V. If not, stop testing. Board needs to be
repaired.
13. Measure and collect input current (Iin) and voltage,
as well as output current and voltage (Vout).
Increase load current in steps of 10 A.
Figure 39. Start-up Circuit Waveform
14. Calculate efficiency (h), load (REGload) and line
regulation (REGline) using Equations 45, 46 and
47.
h+
REG load +
REG line +
V out
V in
I out
I in
100
V out(@noload) * V out(@loaded)
Ť
V out(@noload)
Ť
V out(@Vin1) * V out(@Vin2)
V in1 * V in2
(eq. 45)
100
100
(eq. 46)
(eq. 47)
15. Set load current to 0 A.
16. Repeat steps 13, 14 and 15 for input voltages of
48 V and 76 V.
17. Minimum Efficiency should not drop below 90%
under all load and line conditions.
18. Load Regulation should not exceed 1% under all
load and line conditions.
19. Line Regulation should not exceed 0.1% under all
load and line conditions.
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