Használati útmutató Microchip HV9911DB1
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Supertex inc.
Supertex inc.
www.supertex.com
HV9911DB3
Doc.# DSDB-HV9911DB3
A032713
General Description
The HV9911DB3 is an LED driver capable of driving up to 25
one-watt LEDs in series from an input of 130 - 200VDC. The
demoboard uses Supertex’s HV9911 in a buck topology with the
HV7800 used for high side current sensing. The converter has
a very good initial regulation (+/-5%) and excellent line and load
regulation over the entire input and output voltage range (<+/-
2%). The full load efciency of the converter is typically greater
than 85%.
The HV9911DB3 is protected against open LED and output short
circuit conditions. It is also protected from input under voltage
conditions. It has a very good PWM dimming response, with
typical rise and fall times of less than 5.0μs, which will allow high
PWM dimming ratios.
The switching frequency of the HV9911DB3 can be synchronized
to other HV9911 boards or to an external 150kHz clock by
connecting the clock to the SYNC pin of the HV9911DB3.
Board Layout and Connection Diagram
High Brightness Step-Down LED Driver Demoboard
with Excellent Current Regulation
Specications
Parameter Value
Input voltage (steady state):130 - 200VDC
Output LED string voltage:20V min - 100V max
Average output current:350mA +/-5%
Output current ripple:5% typical
Switching frequency:150kHz
Full load efciency:90% (at 150V input)
Output short circuit protection:Included
Input under voltage protection:Included
PWM dimming performance:5.0μs (rise time)
5.0μs (fall time)
Dimensions:53.7mm x 38.1mm
Connections:
Input - The input is connected between the VIN+ and GND
terminals as shown.
Output - The output is connected between the VO+ and VO-
terminals as shown, with the ANODE of the LED string to
VO+ and the CATHODE to connector VO-.
Enable/PWM Dimming - To enable the board, short pins
PWMD and VDD of connector J1 as shown. To use the PWM
dimming feature of the board, connect an external push-pull
square wave source between terminals PWMD and GND of
connector J1 as shown by the dotted lines.
SYNC - To synchronize two or more boards, connect the
SYNC pins of all the boards. To synchronize the HV9911DB3
to an external 150kHz clock, connect the clock between the
SYNC pin and the GND pin of connector J1.
Note:
During PWM dimming, the PWMD pin of connector J1
should be left open. Also, the PWM signal must have the
proper polarity, with the positive connected to the VDD
pin of connector J1. Note that the GND pin of connector
J1 is internally connected to the return path of the input
voltage.
Actual Size: 53.7mm X 38.1mm
V
IN
J1
J5
J2 J4
J3
GND
PWMD
VDD
SYNC
Termékspecifikációk
| Márka: | Microchip |
| Kategória: | nincs kategorizálva |
| Modell: | HV9911DB1 |
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