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HV9921N8 参数 Datasheet PDF下载

HV9921N8图片预览
型号: HV9921N8
PDF下载: 下载PDF文件 查看货源
内容描述: 3引脚开关模式LED灯驱动器IC [3-Pin Switch-Mode LED Lamp Driver IC]
分类和应用: 驱动器开关
文件页数/大小: 10 页 / 498 K
品牌: SUPERTEX [ Supertex, Inc ]
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HV9921/22
Initial Release
3-Pin Switch-Mode LED Lamp Driver IC
Features
Constant Output Current:
o
HV9921 – 20mA
o
HV9922 – 50mA
Universal 85-264VAC Operation
Fixed OFF-Time Buck Converter
Internal 500V Power MOSFET
General Description
The HV9921/22 are pulse width modulated (PWM)
high-efficiency LED driver control ICs. They allow
efficient operation of LED strings from voltage
sources ranging up to 400VDC. The HV9921/22
include an internal high-voltage switching MOSFET
controlled with fixed off-time T
OFF
of approximately
10µs. The LED string is driven at constant current,
thus providing constant light output and enhanced
reliability. The output current is internally fixed at
20mA for HV9921 and 50mA for HV9922. The peak
current control scheme provides good regulation of
the output current throughout the universal AC line
voltage range of 85 to 264VAC or DC input voltage
of 20 to 400V.
Applications
Decorative Lighting
Low Power Lighting Fixtures
Typical Application Circuit
~
AC
~
C
IN
LED
1
BR1
C
0
-
LED
N
D1
L1
3
V
DD
DRAIN
1
U1
C
DD
HV9921/22
GND
2
NR042205
NR030805