Microchip HV9921DB1 Bruksanvisning
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Supertex inc.
Supertex inc.
www.supertex.com
Doc.# DSDB-HV9921DB1
A032913
HV9921DB1
Introduction
The Supertex HV9921DB1 demoboard is a complete LED
power driver to supply a string of LEDs using the HV9921,
an integrated 3-pin high input voltage constant-current
buck regulator IC. The HV9921 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
20mA ±15%. The HV9921DB1 is ideally suited for driving
strings of LEDs having forward voltage from 20 to 50V at
high efciency (typically 80% at 120VAC).
The HV9921DB1 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
HV9921 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.
Parameter Value
Input voltage range80 to 265VAC
Load current20mA ± 15%
LED string voltage20 ~ 50V
Conducted EMICISPR15
Efciency 80% typ.
L1
C0
D1 U1
CDD
CIN
LED-
D2
+
D3
D5
D4
CIN2
LIN
C2
HV9921
LED+
LED String
VF = 20 to 50V
IF = 20mA
AC Line
80 - 265VAC
Produktspecifikationer
| Varumärke: | Microchip |
| Kategori: | Inte kategoriserad |
| Modell: | HV9921DB1 |
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