NCP1239FDR2 datasheet(23/38 Pages) ONSEMI

Part #	NCP1239FDR2

Description	Low?뭆tandby High Performance PWM Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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23 / 38 page

NCP1239

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23

Figure 41.

Drv

100ms

< 100ms

Bunch length given by timer

Bunch length given by VccOFF

Cpin6 = 390 nF

When VCC drops faster than the timer, it prematurely interrupts the pulses flow.

The 100 ms delay could be shortened or lengthened by changing the Pin 6 capacitor.

VCCOFF

VCC

VCCON

Figure 42.

Drv

100ms

t1

t2

t3

t’1

t’2

Latch−off phase level

Logic reset level

The burst period is ensured by the VCC capacitor charge/discharge cycle

The 100 ms delay could be shortened or lengthened by changing the Pin 6 capacitor.

Cpin6=390 nF

VCCOFF

VCC

VCCON

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