HV9925DB1 Supertex, HV9925DB1 Datasheet

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HV9925DB1

Manufacturer Part Number
HV9925DB1
Description
Power Management IC Development Tools PROGRAMMABLE-CURRENT LED LAMP DRIVER W/PWM DIMMING DEMOBOARD
Manufacturer
Supertex
Datasheet
1.HV9925DB1.pdf (3 pages)

Specifications of HV9925DB1

Product
Power Management Development Tools
Tool Is For Evaluation Of
HV9925
Description/function
LED Driver Demo Board
Factory Pack Quantity
1
Introduction
The Supertex HV9925DB1 demo board is a complete LED
power driver to supply a string of LEDs using the HV9925,
an integrated, high-voltage, buck regulator IC featuring
programmable output current and PWM dimming. The
HV9925 includes a 500V switching MOSFET and can operate
directly from rectified AC line voltages of 80 to 135VAC.
The current in the LED string is externally programmed
to 50mA ±10% by a single resistor RS. The HV9925DB1
is ideally suited for driving strings of LEDs having forward
voltage from 20V to 60V at high efficiency.
The HV9925DB1 is a peak current-controlled buck converter
operating with a fixed off-time of 10.5µs. Its’ fixed off-time
control scheme provides good stability and tight regulation of
the LED current throughout the input AC line voltage range.
As its switching frequency varies over the AC line cycle, the
HV9925 inherently introduces frequency dither and simplifies
the compliance with EMI regulations.
Board Layout and Connection Diagram
Connections
LED+: Connect the Anode of the LED string to this pin.
LED-: Connect the Cathode of the LED string to this pin.
AC1, AC2: Connect AC Line to these pins.
Actual Size: 40mm x 23mm x 16mm
Supertex inc.
Programmable-Current 120VAC
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
LED Driver Demoboard
with PWM Dimming
Dimming
PWM
Specifications
Note:
Parameter
Input voltage range
Load current
LED string voltage
Conducted EMI
Efficiency
The demoboard is not protected from output open/short
circuit condition. Damage to the demoboard may occur if
the output load is not properly connected
●
Tel: 408-222-8888
●
www.supertex.com
80 - 135VAC
HV9925DB1
AC Line
80 to 135VAC
50mA ± 10%
CISPR15
82% typ.
20~60V
Value

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HV9925DB1 Summary of contents

Page 1

... HV9925 includes a 500V switching MOSFET and can operate directly from rectified AC line voltages 135VAC. The current in the LED string is externally programmed to 50mA ±10 single resistor RS. The HV9925DB1 is ideally suited for driving strings of LEDs having forward voltage from 20V to 60V at high efficiency. ...

Page 2

... Connect the AC input to the input terminals. Apply the AC voltage at the input terminals and the LED string should start to glow. The HV9925DB1 will regulate constant 50mA current in the LED. An ammeter can be connected in series with the LED(s) to measure the output current. ...

Page 3

... Fig. 4 PWM Dimming (40µs/div.). Ch1: PWMD, Ch4 Description Renco Electronics On Semiconductor LED Driver IC does not assume responsibility for use of devices described, and limits its liability Supertex inc. 3 HV9925DB1 Manufacturer Manufacturer’s Part Number N/A N/A N/A N/A Panasonic ECQ-E4104KF RL-5480-3-22000 US1G Diodes, Inc DF06M ...

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