TND307 データシートの表示（PDF） - ON Semiconductor

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TND307

Graphical Data Test Circuits for the NCP1650

ON Semiconductor 

TND307

1.5 V

3.3 k

1

2 0.1 mF

3

Vin

AC Comp

4 Ref Filter

5 AC Input

6 FB/SD

7 Loop Comp

8 Pcomp

9 Pmax

Vref

Output 16

IS– 12

Iavg

10

11

Iavg fltr

Ramp

GND

CT Comp

15 14

CT

13

47 k

14 V

1 mF

Figure 19. Minimum Duty Cycle versus Frequency

Re: NCP1650/D data sheet, Figure 25

Apply power to 14 V supply and then to 1.5 V supply.

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.

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