HV9931DB5 Supertex, HV9931DB5 Datasheet - Page 2

• Manufacturer Part Number: HV9931DB5
• Description: Power Management IC Development Tools DOUBLE-BUCK LED DEMOBOARD
• Manufacturer: Supertex

Specifications of HV9931DB5

• Product: Power Management Development Tools
• Tool Is For Evaluation Of: HV9931
• Description/function: LED Driver Demo Board
• Factory Pack Quantity: 1

Testing the HV9931DB5:
Place an ammeter in series with the LED to measure the
LED current. The LED should glow when the AC power is
turned on.
Note on Current Measurement:
The HV9931DB5 is designed to regulate the output current
at 350mA (the recommended current level for most 1.0W
HB LEDs). This can easily be verified by applying a DC
voltage greater than 50V at the input of the demo board.
However, when the output current is measured with an
AC waveform, the measured current is typically around
Fig. 1: Output Current at 120V Input Voltage
Supertex inc.
Fig. 3: Input Voltage and Current Waveforms at 120VAC Input
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1235 Bordeaux Drive, Sunnyvale, CA 94089
2
Open LED Protection:
The HV9931DB5 is not protected against open LED
conditions. Leaving the LED terminals open while applying
an input voltage
300mA. This drop in the current is due to the demo board
turning off when the instantaneous input voltage is less
than 40V. This dropout at low voltages causes the average
current to drop by about 50mA. The output current can be
increased or decreased by increasing the value of resistor
R10 proportionally.
Fig. 2: Output Current at 240V Input Voltage
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will damage
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the circuit.
www.supertex.com
HV9931DB5