TND307 ONSEMI [ON Semiconductor], TND307 Datasheet - Page 6

• Manufacturer Part Number: TND307
• Description: Graphical Data Test Circuits for the NCP1650
• Manufacturer: ONSEMI [ON Semiconductor]

Measure on time, and period at pin 16 using an
oscilloscope. Vary capacitor value from 2000 pF to 100 pF
for frequency range of 25 kHz to 300 kHz.
Figure 19. Minimum Duty Cycle versus Frequency
Apply power to 14 V supply and then to 1.5 V supply.
1.5 V
3.3 k
Re: NCP1650/D data sheet, Figure 25
3
4
5
6
7
8
9
GND
AC Comp
Ref Filter
AC Input
FB/SD
Loop Comp
P
P
comp
max
1
V
15
in
C
14
T
C
T
Output
I
2
13
V
avg fltr
Ramp
Comp
ref
I
I
avg
0.1 mF
S–
47 k
16
12
10
11
1 mF
14 V
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TND307
6