Primary side feedback dimmable single-stage active PFC LED constant current control chip
QH7938
PFC LED
QH7938、 LED ,, 85Vac-265Vac QH7938 LED 。 , 。 , MOS , ,。
QH7938 ,
...
Description
QH7938
PFC LED
QH7938、 LED ,, 85Vac-265Vac QH7938 LED 。 , 。 , MOS , ,。
QH7938 ,
、, PF , THD , ± 3% LED (28uA) FB , LED / / SOP-8
,, ,, 。
QH7938 ,
。 。 , LED 、 LED 、 、 、。 。, QH7938 ,, 。 QH7938 。
GU10/E27 LED 、 LED PAR30、PAR38 LED LED
NP
NS
AC NA
QH7938
2 VCC 3 FB 1 COMP 6 GND
RTH 8 DIM 7 GATE 5 CS 4
1 QH7938
1
QH7938
PFC LED
QQqH7938
SOP8
-40 ℃ 105 ℃
QH7938
2,500 /
XYY
COMP VCC FB CS RTH
QH7938
2
DIM GND GATE
XXXXXY: lot code X: Year YY:Week
1 2 3 4 5 6 7 8 COMP VCC FB CS GATE GND DIM RTH , MOS , ,,
2
PFC LED ( 1)
VCC ICC_MAX COMP FB CS DIM RTH GATE PDMAX θ
JA
VCC MOS ( 2) PN ESD ( 3)
-0.3~25 5 -0.3~6 -0.3~6 -0.3~6 -0.3~6 -0.3~6 -0.3~25 0.45 145 -40 to 150 -55 to 150 2
V mA V V V V V V W ℃/W ℃ ℃ KV
TJ TSTG
1:,。,,
。 。,,。
2:, TJMAX, θ JA, TA 。 PDMAX = (TJMAX - TA)/
θ
JA
。
3:,100pF 1.5KΩ 。
VCC 8.5 ~ 17 V
3
PFC LED ( 4,
VCC_ON VCC_UVLO VCC_OVP VCC_CLAMP ICC_UVLO ICC FB VFB_FALL VFB_HYS VFB_OVP TON_MAX TOFF_MIN TOFF_MAX VCS_LIMIT TLEB_CS TDELAY VREF VCOMP_LO VCOMP VCOMP_OVP COMP COMP COMP 1.5 3.6 0.194 0.200 1.5 3.5 0.206 V V V V CS 1.0 350 200 V ns ns FB FB FB FB FB 0.1 0.08 1.6 25 4.5 100 V V V us us us VCC VCC VCC VCC VCC VCC VCC , VCC= VCC_ON - 1V FOP=10kHz, Load=100pF VCC VCC 16.7 7.5 19 23 33 1 50 2 V V V V uA mA 5) (,VCC =15 V, TA =25 ℃)
_
4
PFC LED
VDIM_ON VDIM_HYS VDIM_MIN ...
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