HV9930DB1 Supertex, HV9930DB1 Datasheet - Page 3

• Manufacturer Part Number: HV9930DB1
• Description: LED Lighting Development Tools HV9930 Demo Board
• Manufacturer: Supertex

Specifications of HV9930DB1

• Product Category: LED Lighting Development Tools
• Product: Demonstration Boards
• Core: HV9930
• Operating Supply Voltage: 9 V to 16 V
• Factory Pack Quantity: 1
• For Use With: 7 - 1 W LEDs

The waveforms in Fig.4 show the drain voltage of the FET
(channel 1 (blue); 10V/div) and the LED current (channel 4
(green); 100mA/div) at three different operating conditions
– 9.0V in, 13.5V in and 16V in.
Supertex inc.
Fig. 4. Steady State Waveforms
(a): 9.0V in; (b): 13.5V in; (c): 16V in
(b)
(a)
(c)
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1235 Bordeaux Drive, Sunnyvale, CA 94089
3
Fig. 5 shows the operation of the converter during cold crank
conditions as the input voltage decreases from 13.5V to
6V and increases back to 13.5V. In these cases, the input
current reaches the limit set and the output current drops
correspondingly. Thus, the LEDs continue to glow, but with
reduced intensity. Once the voltage ramps back up, the out-
put current goes back to its normal value and the converter
comes out of the input current limit.
Fig.6 shows the LED current during an input step change
from 13.5 to 42V and back to 13.5V (similar to a clamped
load dump). It can be seen that the LED current drops briefly
when the input voltage jumps, but there are no overshoots.
Fig. 6 LED current during step changes
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Channel 4 (green): LED current; 100mA/div
Channel 4 (green): LED current (100mA/div)
Channel 1 (blue): Input voltage (10V/div)
Fig. 5. Cold Crank Operation
Channel 3 (pink): Input current (1A/div)
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Channel 1(blue): Input voltage (10V/div)
in the input voltage
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www.supertex.com
HV9930DB1