ncp1239f ON Semiconductor, ncp1239f Datasheet - Page 23

• Manufacturer Part Number: ncp1239f
• Description: Lowstandby High Performance Pwm Controller
• Manufacturer: ON Semiconductor

Drv
V
CC
Drv
V
CC
The 100 ms delay could be shortened or lengthened by changing the Pin 6 capacitor.
Bunch length given by timer
The 100 ms delay could be shortened or lengthened by changing the Pin 6 capacitor.
When V
The burst period is ensured by the V
100ms
CC
drops faster than the timer, it prematurely interrupts the pulses flow.
100ms
t1
t2
http://onsemi.com
C
C
Figure 41.
Figure 42.
Latch−off phase level
Logic reset level
NCP1239
pin6
pin6
=390 nF
23
= 390 nF
Bunch length given by VccOFF
CC
capacitor charge/discharge cycle
t3
t’1
< 100ms
V
V
CCOFF
CCON
100ms
V
V
CCOFF
CCON
t’2