參數(shù)資料
型號(hào)： L6668TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING CONTROLLER, 105 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, SOP-16
文件頁(yè)數(shù)： 10/23頁(yè)
文件大?。?/td> 720K
代理商： L6668TR
L6668
18/23
Figure 43 shows a timing diagram where the PFC_STOP function operation is illustrated under different
operating conditions.
Figure 42. How the L6668 can switch off a PFC controller at light load
Figure 43. Operation of PFC_STOP function
Figure 44. Operation after DIS pin activation: timing diagram
L6668
PFC_STOP
14
16
Vcc
10 k
BC557
2.2 k
PFC
controller
Vcc
8.2 V
L6668
PFC_STOP
14
16
Vcc
10 k
BC557
2.2 k
PFC
controller
Vcc
8.2 V
Vcc
PFC_STOP
OUT
VccON
VccOFF
t
PFC
Gate
Drive
t
COMP
2.2V
2.7V
Start-up
Full-load
Light-load
Full-load
Vcc
OUT
Vin
VccON
VccON -0.5
t
2.2V
VccOFF
DIS
Vccrest
VHVstart
HV generator is turned on
Disable latch is reset here
HV generator is disabled here
Input source is removed here
Vcc
OUT
Vin
VccON
VccON -0.5
t
2.2V
VccOFF
DIS
Vccrest
VHVstart
HV generator is turned on
Disable latch is reset here
HV generator is disabled here
Input source is removed here
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