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TND308
Graphical Data Test Circuits for the NCP1651
Prepared by Alan Ball ON Semiconductor Applications Engineering
The following circuits are the test configurations that were used to obtain the data for the graphical section of the NCP1651/D data sheet. Each graph has a schematic associated with it and in some cases a description of the procedure.
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APPLICATION NOTE
NCP1651 NCP1651
1.5 V
13
16
VCC Startup
11 AC Comp 8 FB/SD
10 Ref Fltr 9 AC Input
12 0.1 mF Vref Output 1 IS+ 5
Iavg
7 6
Iavg fltr
14 V 1 mF
+ 0–1 V
0.5 nF
Ramp
GND 2
CT Comp 34
4.7 k
470 pF
47 k
Figure 1. Current Sense Amplifier Gain Re: NCP1651/D data sheet, Figure 4
Energize all three power sources, beginning with the 14 volt supply.