Microchip HV9931DB1 Bruksanvisning
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HV9931DB1
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HV9931DB1
Doc.# DSDB-HV9931DB1
A032713
The HV9931 LED driver is primarily targeted at low to
medium power LED lighting applications where galvanic
isolation of the LED string is not an essential requirement.
The driver provides near unity power factor and constant
current regulation using a two stage topology driven by
a single MOSFET and control IC. Triac dimming of this
design is possible with the addition of some components for
preloading and inrush current shaping.
The DB1 and DB2 Demoboards were designed for a xed
string current of 350mA and a string voltage of 40V for a load
power of about 14W. The boards will regulate current for an
output voltage down to 0V.
Nominal input voltage for the DB1 is 120VAC, for the DB2
230VAC. Design for universal input (85 to 265VAC) is by
all means possible but does increase cost and size while
lowering efciency.
The input EMI lter was designed to suppress the differential
mode switching noise to meet CISPR15 requirements.
No specic components were added to suppress currents
of common mode nature. Common mode current can be
controlled in many ways to satisfy CISPR 15 requirements.
The board is tted with a number of optional circuits; a
schematic of a simplied driver is given as well. The circuits
featured are output current soft start and protections from
line overvoltage, load overvoltage and open circuit. The
driver is inherently short circuit proof by virtue of the peak
current regulation method.
Board Layout and Connections
LED Driver Demoboard
Input 120VAC // Output 350mA, 40V (14W)
Specications
Input voltage: 100VRMS to 135VRMS, 60Hz
Output voltage: 0 to 40V
Output current: 350mA +/-5%
Output power: 14W, Max
Power factor 98%
Total harmonic distortion EN61000-3-2 Class C
EMI limits CISPR 15 (see text)
Efciency 83%
Output current ripple 30%PP
Input overvoltage
protection 140VRMS, Latching
Output overvoltage
protection 43V, Latching
Switching frequency 73kHz
Dimensions: 3.5” x 3.0” x 1.25”
General Description
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Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV9931DB1 |
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