Microchip HV9918DB1 Bruksanvisning
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HV9918DB1
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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9918DB1
A032913
HV9918DB1
High Current LED Driver Demoboard
Specications
The HV9918DB1 demoboard is a high current LED driver designed
to drive one or two LEDs at 700mA from a 9.0 - 16VDC input. The
demoboard uses Supertex’s HV9918 hysteretic buck LED driver
IC.
The HV9918DB1 includes digital control of PWM dimming, which
allows the user to dim the LEDs using an external, TTL-compatible
square wave source applied between and . In this case, DIM GND
the PWM dimming frequency and duty ratio are set by the external
square wave source.
The demoboard is protected against short circuit and open LED
conditions. It also includes thermal derating of the LED current us-
ing an external NTC resistor to prevent over-heating.
The bottom of the HV9918DB1 is an exposed copper plane (con-
nected to the input ground) which can be connected to a 1” square
heatsink (eg: 374324B00035G from Aavid Thermalloy) to allow
for operation in higher ambient temperatures without tripping the
HV9918’s built-in over temperature protection.
Parameter Value
Input voltage 9.0 - 16VDC
Output voltage 2.0 - 7.0V
Output current 700mA ± 5%
Line and load regulation < ±2%
Output current ripple 5% (peak to peak)
Full load efciency
(@12.0V input) 87%
Open LED protection Yes
Output short circuit protection Yes
Dimensions 25.4mm X 29.2mm
General Description
Connection Diagram
Input Connection: Connect the input DC voltage between
VIN GND and terminals.
Output Connection: Connect the LED(s) between LED+
(anode of LED string) and (cathode of LED string) ter-LED-
minals.
PWM Dimming Connection:
1. If no PWM dimming is required, short PWMD and
VDD terminals.
2. If dimming using an external PWM dimming source,
connect the PWM source between the PWMD and
GND terminals.
NTC Thermistor Connection:
1. If no thermal derating is required, the terminal NTC
can be left open.
2. If thermal derating of the LED current is required, the
NTC thermistor can be connected between NTC
and GND terminals as shown.
Connections
Silk Screen
NTC
+
-
Supertex
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV9918DB1 |
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