Microchip HV9923DB1 Bruksanvisning
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HV9923DB1
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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9923DB1
A032913
HV9923DB1
Introduction
The Supertex HV9923DB1 demoboard is a complete LED
power driver to supply a string of LEDs using the HV9923,
an integrated 3-pin high input voltage constant-current
buck regulator IC. The HV9923 integrates a 500V switching
MOSFET and can operate directly from the rectied universal
AC line voltage range of 80 to 265VAC.
The current in the LED string is internally programmed to
30mA ±15%. The HV9923DB1 is ideally suited for driving
strings of LEDs having forward voltage from 20 to 30V at
high efciency (typically 80% at 120VAC).
The HV9923DB1 is a peak current-controlled buck converter
operating with xed off-time of 10.5us. Its xed off-time
control scheme provides good stability and tight regulation
of the LED current throughout the input AC line voltage
range. As its switching frequency varies over the AC line
cycle, the HV9923 inherently introduces frequency dither
and simplies the compliance with EMI regulations.
Specications
Board Layout and Connection Diagram
Universal Off-line
LED Driver Demoboard
Connections
LED+: Connect the Anode of the LED string to this pin.
LED-: Connect the Cathode of the LED string to this pin.
AC1, AC2: Connect AC Line to these pins.
Note:
The demoboard is not protected from output open/
short circuit condition. Damage to the demoboard may
occur if the output load is not properly connected.
L1
C0
D1
U1
CDD
CIN
LED-
D2
+
D3
D5
D4
CIN2
LIN
C2
HV9923
LED+
LED String
V
F
= 20 to 30V
I
F
= 30mA
AC Line
80 - 265VAC
Parameter Value
Input voltage range 80 to 265VAC
Load current 30mA ± 15%
LED string voltage 20 - 30V
Conducted EMI CISPR15
Efciency 80% typ.
Produkspesifikasjoner
| Merke: | Microchip |
| Kategori: | Ikke kategorisert |
| Modell: | HV9923DB1 |
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