Microchip AT9919DB1 Bruksanvisning
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AT9919DB1
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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSDB-AT9919DB1
A032713
AT9919DB1
Single, High Current, LED Driver Demoboard
Specications
The AT9919BDB1 demoboard is a high current LED driver
designed to drive one LED at 1.0A from a 9.0 - 16VDC input.
The demoboard uses Supertex’s AT9919 hysteretic buck
LED driver IC.
The AT9919DB1 includes two PWM dimming modes. The
analog control of the PWM dimming mode allows the user to
dim the LED using a 0 - 2.0V analog signal applied between
the ADIM and GND pins (0V gives 0% and 2.0V gives 100%).
In this mode, the PWM dimming frequency is set to 1kHz on
the board. The digital control of PWM dimming mode allows
the user to dim the LEDs using an external, TTL-compatible
square wave source applied between DIM and GND. In this
case, the PWM dimming frequency and duty ratio are set by
the external square wave source.
Parameter Value
Input voltage 9.0 - 16VDC (steady state)
40V max (transient)
Reverse polarity protection 60V (max)
Output voltage 2.0 - 5.0V
Output current 1.0A ± 5%
Output current ripple (@13.5V
input and 3.3V output) 16% (peak to peak)
Full load efciency
(@13.5V input) 84%
Open LED protection Yes
Output short circuit protection Yes
Dimensions 25.4mm X 25.4mm
General Description
Connection Diagram
Input Connection: Connect the input DC voltage between
VIN and GND terminals of connector J1 as shown in the
connection diagram.
Output Connection: Connect the LEDs between LED+
(anode of LED string) and LED- (cathode of LED string) of
connector J2.
PWM Dimming Connection:
1. If no PWM dimming is required, short DIM, VDD and
ADIM terminals of connector J3.
2. If dimming using an external PWM dimming source,
connect the PWM source between the DIM and GND
terminals of connector J3 and short terminals ADIM
and VDD. The recommended PWM dimming frequen-
cy is ≤1.0kHz.
3. If dimming using an external analog voltage source,
connect the source between the ADIM and GND ter-
minals of connector J3 and short terminals DIM and
VDD. The voltage range for control of the PWM dim-
ming is 0 - 2.0V.
Connections
Silk Screen
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | AT9919DB1 |
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