Supertex inc.
Supertex inc.
●
1235 Bordeaux Drive, Sunnyvale, CA 94089
●
Tel: 408-222-8888
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www.supertex.com
1
General Description
The HV9910BDB1 demoboard is an offline, high current
LED driver designed to drive a 40V LED string at 1.4A from
a 110V input. The demoboard uses Supertex’s HV9910B
LED driver IC to drive a buck converter.
The HV9910BDB1 has a typical full load efficiency of 88%,
with the buck converter efficiency (excluding the diode
bridge rectifier and EMI filter) at 93%. The demoboard also
meets CISPR-15 conducted EMI standards.
The output current can be adjusted in two ways - either
with linear dimming using the onboard potentiometer or
with PWM dimming by applying a TTL-compatible square
wave signal at the PWMD terminal. Using linear dimming,
the output current of the HV9910DB1 can be lowered to
about 0.1A (note: zero output current can be obtained only
by PWM dimming).
Connection Diagram
HV9910BDB1
Off-Line, High Brightness, 1.4A
LED Driver Demo Board
WARNING!!!
Do not connect earth-grounded test instruments. Doing so will short the AC line, resulting in damage to the
instrument and/or the HV9910BDB1. Use floating high voltage differential probes or isolate the demoboard
by using an isolating transformer.
There is no galvanic isolation. Dangerous voltages are present when connected to the AC line.
Specifications
Input voltage
90 - 135Vrms, 50/60Hz
Output voltage
10 - 40V
Output current
1.4A max
Output current ripple (typ)
40% (peak-peak)
Full load efficiency (@110V)
88%
Power factor (@110V)
0.64
Input current (@110V)
0.83A rms
Input current THD (@110V)
117%
Switching frequency (typ)
50kHz
Minimum output current (@110V)
0.1A
Conducted EMI
Meets CISPR-15
Temperature rise of heatsink
(@110V input and full load)
50°C
Open LED protection
yes
Output short circuit protection
no
Dimensions
86.4mm X 58.4mm
90 - 135VAC
50/60Hz
10 - 40V, 1.4A max.