Instrukcja obsługi Microchip HV9912DB1
Microchip
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HV9912DB1
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Supertex inc.
Supertex inc.
www.supertex.com
HV9912DB1
Doc.# DSDB-HV9912DB1
A032913
The HV9912DB1 is an LED driver demoboard capable of driving up
to 20 one-watt LEDs in series from an input of 21 - 27VDC. It uses
the Supertex HV9912 in a boost topology. The converter has very
good initial regulation (+/-5%) and excellent line and load regulation
over the entire input and output voltage range (<+/- 1%). The full
load efciency of the converter is typically greater than 90%.
The HV9912DB1 is protected against open LED and output short
circuit conditions. It is also protected under input under-voltage
conditions by limiting the input current. It has an excellent PWM
dimming response, with typical rise and fall times less than 1.0μs,
which allows high PWM dimming ratios. The switching frequency of
the HV9912DB1 can be synchronized to other HV9912 boards or
to an external 200kHz clock by connecting the clock to the SYNC
pin of the HV9912DB1.
The HV9912DB1 features hiccup mode short circuit and open LED
protection. Upon detection of either fault condition, the IC shuts
down the driver and periodically attemps to restart until the fault
condition ends. The HV9912DB1 also features a built-in 500ns
blanking to prevent false tripping of the over-current comparator
due to parasitic capacitance spikes during PWM dimming.
Board Layout and Connection Diagram
High Brightness Boost LED Driver Demoboard
with 1:3000 Dimming Ratio and Hiccup Mode Protection
Parameter Value
Input voltage (steady state): 21 - 27VDC
Output LED string voltage: 35V min - 80V max
Output current: 350mA +/-5%
Output current ripple: 10% typical
Switching frequency: 200kHz
Full load efciency: 93% (at 24V input)
Open LED protection: Shuts down at 92V
Output short circuit
protection: Included
Input under voltage
protection: Included
PWM dimming: 1:3000 dimming ratio
at 200Hz
Connections
Input - The input is connected between the terminals of
connector J1 as shown in the Connection Diagram.
Output - The output is connected between the terminals of
connector J2 as shown.
Enable/PWM Dimming - To just enable the board, short pins
PWMD and VDD of connector J3 as shown by the dashed
lines. To PWM dim the board, connect the external push-
pull waveform source between terminals PWMD and GND
of connector J3 as shown by the solid lines.
SYNC - To synchronize two or more boards, connect the
SYNC pins of all the boards together. To synchronize the
HV9912DB1 to an external 200kHz clock, connect the clock
between the SYNC and GND pins of terminal J3.
Note:
During PWM dimming, pin 2 of connector J3 should be left
open. Also, the PWM signal must have the proper polarity
with the positive connected to pin 3 of J3. Note that pin 4
of J3 is internally connected to the return path of the input
voltage.
Actual size: 64.0mm x 34.5mm
V
IN
+
General Description Specications
Specyfikacje produktu
| Marka: | Microchip |
| Kategoria: | nieskategoryzowany |
| Model: | HV9912DB1 |
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