Instrukcja obsługi Microchip HV9921DB1

Microchip Niesklasyfikowane HV9921DB1

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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 rectied 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 efciency (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 simplies
the compliance with EMI regulations.
Specications
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 range 80 to 265VAC
Load current 20mA ± 15%
LED string voltage 20 ~ 50V
Conducted EMI CISPR15
Efciency 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
Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives
an adequate “product liability indemnification insurance agreement.” does not assume responsibility for use of devices described, and limits its liabilit Supertex inc. y
to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and
specifications are subject to change without notice. For the latest product specifications refer to the (website: http//wwwSupertex inc. .supertex.com)
©2013 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Supertex inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089
Tel: 408-222-8888
www.supertex.com
2
HV9921DB1
Doc.# DSDB-HV9921DB1
A032913
Schematic Diagram
Testing the HV9921DB1
Connect the LED string to the output terminals.
Check the polarity of the LED connection, anode end of the
string should be connected to the positive output, cathode
should be connected to the negative output. Connect the
AC input to the input terminals. Apply the AC voltage at
the input terminals and the LED string should start to glow.
The HV9921DB1 will regulate constant 20mA current in the
LED.
An ammeter can be connected in series with the LED(s) to
measure the output current. The average current reading
may be smaller than 20mA. This is due to the interruptions
in the LED current when the input AC line voltage falls below
the forward voltage of the LED string. The average current
will also vary over the AC line voltage range. Additional
hold-up capacitance can be included across CIN, if these
interruptions are not desirable.
C
IN
AC Line
85-265V C
DD
3
HV9921
D1
L1
LED
1
- LED
12
D2
U1
D3
D4 D5
C
IN2
L
IN
VRD1
F1
C
O
VDD
DRAIN
GND 1
2
Reference Description Part Number Manufacturer
CIN 0.1µF, 400V, metalized polyester lm ECQ-E4104KF Panasonic
CIN2 0.033µF, 400V, metalized polyester lm ECQ-E4333KF Panasonic
CO0.01µF, 100V, X7R, MLCC B37981M1103K054 Epcos
CDD 0.1µF, 50V, X7R, MLCC B37987F5104K054 Epcos
L1 68mH, 36mA, mini-drum RL-5480-3-68000 Renco Electronics
LIN 2.2mH, 64mA, axial CTH6-222K Central Technologies
D1 Diode, UF 600V 1.0A 75ns MUR160 On Semiconductor
D2-5 Diode, 600V 1.0A 1N4005 Diodes, Inc
VRD1 Surge absorber ERZ-V05D431 Panasonic
U1 LED Driver IC HV9921N3-G Supertex, Inc
F1 Integrated PCB fuse N/A N/A
Bill of Materials

Specyfikacje produktu

Marka: Microchip
Kategoria: Niesklasyfikowane
Model: HV9921DB1

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