Microchip HV9910B Bruksanvisning
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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9910BDB3
A032813
HV9910BDB3
General Description
The HV9910BDB3 demoboard is a high current LED driver
designed to drive one LED or two LEDs in series at currents
up to 1.0A from a 10 – 30VDC input. The demoboard uses
Supertex’s HV9910B Universal LED driver IC to drive a
buck converter.
The HV9910BDB3 can be congured to operate in either a
constant frequency mode (for driving a single LED) or in a
constant o-time mode (for driving two LEDs).
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 0.01A (note: zero output current can be obtained
only by PWM dimming).
Connection Diagram
Low Voltage, High Current,
LED Driver Demoboard
Specications
Parameter Value
Input voltage10 - 30VDC
Output voltage -
constant frequency mode2.0 - 4.5V
Output voltage -
constant o-time mode4.0 - 8.0V
Maximum output current1.0A ± 10%
Output current ripple (typ)20% (peak-peak)
Efciency (@ 12V input)86% (for one LED)
93% (for two LEDs)
Open LED protectionyes
Output short circuit protectionno
Dimensions48.2mm X 29.0mm
Connections
1. Input Connection -Connect the input DC voltage
between VIN and GND terminals of connector J1 as shown
in the connection diagram.
2. Output Connection -Connect the LEDs between
LED+ (anode of LED string) and LED- (cathode of LED
string) of connector J2.
a. If the load is one LED, short the RT and FREQ
terminals of connector J4 using a jumper.
b. If the load is two LEDs, short the RT and OFFT
terminals of connector J4 using a jumper.
3. PWM Dimming Connection
a. If no PWM dimming is required, short PWMD and
VDD terminals of connector J3.
b. If PWM dimming is required, connect the TTL-
compatible PWM sourc between PWMD and GND
terminals of connector J3. The recommended PWM
dimming frequency is ≤ 1.0kHz.
+
Short for constant
frequency mode
+
-
Short for
constant o-time mode
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV9910B |
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