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HT7L4091 数据表(PDF) 21 Page - Holtek Semiconductor Inc

部件名 HT7L4091
功能描述  Universal Step-Down PWM Control For High Brightness LED Lighting Control
PDF  26 Pages
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制造商  HOLTEK [Holtek Semiconductor Inc]
网页  http://www.holtek.com
标志 HOLTEK - Holtek Semiconductor Inc

HT7L4091 数据表(HTML) 21 Page - Holtek Semiconductor Inc

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Rev. 1.00
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Rev. 1.00
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HT7L4091
Universal Step-Down PWM Control
For High Brightness LED Lighting Control
BJT Power Supply Application Circuit
The application circuit uses a BJT to supply the device power to obtain better efficiency.
Zin
CIN
RIN
BJT
Cfi�te�
GDR
CS
VIN
GND
RT
LD
VDD
PDM
C7
�C
EMI
Lc
Lc
Ca1
Ca�
C1
0.1uF
400V
1uF
50V
0.1uF
L
D1
VLED
Co
MOSFET
Rcs
CC
Rc
RT
CT
5�F
��uF
400V
If frequency jittering is considered to reduce EMI an optional 5pF CT may be used to stabilise the
effect.
For more details refer to the application note.



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