Microchip HV9967BDB1 Handleiding
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Supertex inc.
Supertex inc.
www.supertex.com
HV9967BDB1
Doc.# DSDB-HV9967BDB1
B101613
General Description
The HV9967BDB1 demoboard is a high-brightness LED
driver designed to drive 4 LEDs in series at currents up to
350mA from a 20 - 60V DC input. The demoboard uses the
Supertex’s HV9967B in a buck conguration in a constant
off-time mode.
The HV9967BDB1 LED driver features tight regulation of the
LED current within a few milliamps over the entire range of
the input voltage (i.e. 20 - 60VDC). The LED current accuracy
is almost insensitive to the passive component tolerances,
such as the inductance or the timing resistor.
PWM dimming can be achieved by applying a pulse-width-
modulated square wave signal between the PWMD and
GND pins.
4W LED Driver Demoboard
with Accurate Average-Mode Constant Current Control
Connection Diagram
1. Connect the LED string between LED+ (Anode of
LED string) and LED- (Cathode of LED string).
2. Connect the PWMD terminal to the VDD terminal
to enable the LED driver if PWM dimming is not re-
quired.
3. Connect the input DC voltage between the VIN+
and VIN- terminals.
Connections
Parameter Specification
Input voltage20 - 60 VDC
Output voltage10 -15VDC (4 x LEDs)
Output current350mA ± 5%
Output current ripple
20% pk-pk
(Typical, depending on
the type of LED)
Switching frequency Variable with constant
TOFF = 5µs ± 20%
Full load efciency Typical 80% minimum
Output short circuit protectionIncluded, hiccup mode
Specifications
VLED (+)
VLED (-)
VIN (+) VIN (-)VDD PWMD GND
Product specificaties
| Merk: | Microchip |
| Categorie: | Niet gecategoriseerd |
| Model: | HV9967BDB1 |
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