ON Semiconductor NCP102 Reference guide

NCP102 Demonstration Board Test Procedure
Figure 1 Test Setup
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NCP102 Demonstration Board Test Procedure
Required Equipment:
1. 3 DC Power Supplies:
a. “Vin supply” possessing a minimum voltage rating of 5 VDC
and minimum current rating of 4 ADC; for example, HP
6282A.
b. “Vcc supply” possessing a minimum voltage rating of 15
VDC and minimum current rating of 1 ADC; for example, ½
Agilent e3649A dual supply.
c. “N_Enable supply” possessing a minimum voltage rating of
5.5 VDC and minimum current rating of 0.1 ADC; for
example, ½ Agilent e3649A dual supply.
2. 3 Auto-ranging Digital Multimeters (DMMs): each
possessing a minimum voltage rating of 20 VDC and
minimum current rating of 2ADC; for example, Keithley 175.
3. 1 Electronic Load: possessing a current display and
minimum current capability of 4 ADC; for example, Kikusui
PLZ303W.
Test Procedure:
Establish Setup
1. Connect the NCP102 Demonstration Board as shown in
Figure 1.
2. Adjust the N_Enable supply to 4.5VDC while observing the
indicator on the supply.
Note: for measurement accuracy, the DMMs must be connected
to the Demonstration Board terminals and not the DC supply or
load terminals. This is particularly true for DMM 2 and DMM 3.
3. Connect DMM 1 to Vcc and configure as a voltmeter. Set
DMM 1for auto-range.
4. Connect DMM 2 to Vin and configure as a voltmeter. Set
DMM 2 for auto-range.
5. Connect DMM 3 to Vout and configure as a voltmeter. Set
DMM 3 for auto-range.
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NCP102 Demonstration Board Test Procedure
6. Adjust the Vcc supply to 5.0VDC while observing DMM 1
(not the indicator on the DC supply).
7. Adjust the Vin supply to 1.800VDC while observing DMM 2
(not the indicator on the DC supply).
8. Disable the electronic load so that it is neither sinking nor
sourcing current.
No-Load Regulation and Enable Function
1. Verify that Vout (DMM 3) equals zero VDC.
2. Temporarily disconnect the banana cable connected to
“N_Enable”, or reduce the “N_Enable” supply to zero Volts.
3. Verify that Vin (DMM 2) equals 1.800VDC, +/- 2%
(1.764VDC to 1.836VDC).
4. Readjust the Vin supply if necessary.
5. Verify that Vout (DMM 3) equals 1.200VDC, +/- 2%
(1.176VDC to 1.224VDC).
6. Reconnect the banana cable to “N_Enable”, or adjust the
“N_Enable” supply output to 4.5VDC.
7. If Vcc= 12.0VDC (DMM 1), go to Full-Load Regulation and
Enable Function, below.
8. Adjust the Vcc supply to 12.0VDC, as indicated on DMM 1.
9. Repeat steps 1 through 7 of this section.
Full-Load Regulation and Enable Function
1. While observing the front panel indicator on the electronic
load, adjust it to sink 3.5ADC from the demonstration board
Vout terminal.
2. Enable the electronic load.
3. Verify that Vout (DMM 3) equals zero VDC.
4. Temporarily disconnect the banana cable connected to
“N_Enable”, or reduce the “N_Enable” supply to zero Volts.
5. Verify that Vin (DMM 2) equals 1.800VDC, +/- 2%
(1.764VDC to 1.836VDC).
6. Readjust the Vin supply if necessary.
7. Verify that Vout (DMM 3) equals 1.200VDC, +/- 2%
(1.176VDC to 1.224VDC).
8. Reconnect the banana cable to “N_Enable”, or adjust the
“N_Enable” supply output to 4.5VDC.
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NCP102 Demonstration Board Test Procedure
9. If Vcc= 5.0VDC (DMM 1), go to Step 12.
10. Adjust the Vcc supply to 5.0VDC, as indicated on DMM 1.
11. Repeat steps 1 through 9 of this section.
12. Verify that Vout (DMM 3) equals zero VDC.
13. Test complete.
Revision History
Revision Release Date Changes Responsible
1 Original Release Mike Stimbert
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