HV9930DB1 Supertex, HV9930DB1 Datasheet - Page 2

• 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

Testing the Demo Board
Normal Operation: Connect the input source and the output
LEDs as shown in the Connection Diagram and enable the
board. The LEDs will glow with a steady intensity. Connect-
ing an ammeter in series with the LEDs will allow measure-
ment of the LED current. The current will be 350mA +/- 5%.
Open LED test: Connect a voltmeter across the output ter-
minals of the HV9930DB1. Start the demoboard normally,
and once the LED current reaches steady state, unplug one
end of the LED string from the demoboard. The output volt-
age will rise to about 33V and stabilize.
Short Circuit Test: When the HV9930DB1 is operating in
steady state, connect a jumper across the terminals of the
LED string. Notice that the switching frequency drops, but
the average output current remains the same.
PWM Dimming: With the input voltage to the board discon-
nected, apply a TTL compatible, push-pull square wave sig-
nal between PWMD and GND terminals of connector J3 as
shown in the Connection Diagram. Turn the input voltage
back on and adjust the duty cycle and / or frequency of the
PWM dimming signal. The output current will track the PWM
dimming signal. Note that although the converter operates
perfectly well at 1.0kHz PWM dimming frequency, the best
PWM dimming ratios can be obtained at lower frequencies
like 100 or 200Hz
Typical Results
Fig. 1 shows the efficiency plot for the HV9930DB1 over the
input voltage range. The converter has efficiencies greater
than 80% over 13V input. Note that these measurements
do not include the 0.3 - 0.5W loss in the reverse blocking
diode.
84
82
80
78
76
74
72
70
8
Supertex inc.
Fig. 1 Efficiency vs. Input Voltage
10
Input Voltage (V)
12
●
14
1235 Bordeaux Drive, Sunnyvale, CA 94089
16
18
2
Fig. 2 shows the variation of the switching frequency over
the input votage range. The frequency varies from 300kHz
to 500kHz over the entire input voltage range and avoids the
restricted frequency band of 150kHz to 300kHz and the AM
band greater than 530kHz. This makes it easier to meet the
conducted and radiated EMI specifications for the automo-
tive industry.
Fig.3 shows the output current variation over the input volt-
age range. The LED current has a variation of about 2.0mA
over the entire voltage range.
350.5
349.5
348.5
350.0
349.0
348.0
500
450
400
350
300
8
8
Fig.2 Switching Frequency vs. Input Voltage
●
Tel: [phone]
Fig. 3 Output Current vs. Input Voltage
10
10
Input Voltage (V)
Input Voltage (V)
12
12
●
www.supertex.com
14
14
HV9930DB1
16
16
18
18