HV9906DB3
Off-Line PFC Current Source Controller
Introduction
The Supertex HV9906DB3 demo board is a power
factor corrected (PFC) LED driver using the HV9906
IC. A power converter of the demo board consists of
an input buck-boost stage and an output buck stage.
The output voltage polarity is negative. Due to its
unique quadratic input-to-output DC voltage transfer
ratio, the converter can operate directly off AC line to
produce low-voltage output without need for
electrolytic capacitors. The HV9906 is designed for
optimally controlling this type of a power converter or
other types of two-stage multi-converters.
HV9906DB3 demo board features passive power
factor correction to PF>0.95. The board is optimized
for driving a 500mA (700mA max.) LED array.
(Forced cooling or encapsulation is required to
achieve an output current higher than 500mA.)
Features
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Off-Line Transformerless Power Conversion
Power Factor Correction to PF>0.95
Soft Start
Low Inrush Current on Start
Specification
Input Voltage
Output Current
Output Voltage
Power Factor
Total AC Line Harmonic Distortion (THD)
Efficiency
80 to 135VAC, 47-63 Hz
or 100 to 200VDC
500mA
鹵10%
(700mA max.)
10V max.
>0.95
<15%
60%
(Vo=10V, Io=0.5A, Vin=100VAC)
Board Layout and Connections
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WARNING!!!
Do not connect to scope ground or to the ground of other earth-grounded instruments. Doing so will short the AC line,
resulting in damage to the circuit and/or instruments. Either use an isolation transformer on the AC line, use a
differential probe, or use a floating, battery-powered instrument to make measurements.
WARNING!!!
No galvanic isolation. Dangerous voltages are present when connected to the AC mains.
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09/05/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
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