Microchip HV861DB1 Bedienungsanleitung


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Supertex inc.
Supertex inc.
www.supertex.com
HV861DB1
Doc.# DSDB-HV861DB1
A032813
General Description
The Supertex HV861DB1 demoboard contains all the
necessary circuitry to demonstrate the features of the HV861
dual EL Lamp driver.
Simply connect it to a power supply and a lamp as shown in
Figure 1.
A 2.2µF capacitor is connected between VREF and GND. It
allows the lamp to slowly (in about 400ms) brighten up/dim
down during power up/power down. The dimming feature is
common to both lamps.
Board Layout
Dimmable, Low Noise, Dual EL Lamp
Driver Demoboard
Specications
Parameter Value
VDD input voltage: 2.5V to 4.5V
VIN inductor supply voltage: 3.2V to 4.2V
Typical supply current: 28mA
Lamp size: 4.5in2
Lamp frequency: 188Hz
Converter frequency: 98kHz
Connections:
EN1 and EN2: Lamp Selection
CMOS logic inputs which enable/disable the lamp drivers.
When EN1 is connected to VDD/GND, Lamp 1 (EL1) will
be ON/OFF. When EN2 is connected to VDD/GND, Lamp 2
(EL2) will be ON/OFF.
VDD: IC Supply
Supplies the HV861 EL driver IC. The supplied circuit is op-
timized for 3.0V operation.
VIN: Inductor Supply
Supplies the high voltage power converter. The demoboard
is optimized for 3.2V to 4.2V operation
GND: Circuit Ground
Connect to VDD and VIN negative terminals. Supply bypass
capacitor for both VDD and VIN are provided on the demo
board. External supply bypass capacitors are not necessary.
EL1 and EL2: Lamp Connections
Connects to Lamps 1 and 2.
COM1 and COM2: Lamp Connections
Connects to the other side of Lamps 1 and 2.
Actual Dimensions: 26mm x 24mm
Notes:
All of the above connections must be made before powering up the supply voltages.
The VREG pin should not be touched after power-up.
EL1
COM1
COM2
EL2
VDD
EN1
EN2
GND
VIN
2
HV861DB1
Supertex inc.
www.supertex.com
Doc.# DSDB-HV861DB1
A032813
Figure 1: HV861DB1 Circuit Schematic
Typical Performance
VDD
(V)
VIN
(V) Lamp IIN
(mA)
VCS
(VPEAK)
fEL
(Hz)
Lamp Brightness
(cd/m2)
EL1 EL2
3.0 3.2
EL1 ON 21.3
93 188
14.6 -
EL2 ON 14.8 - 17.8
EL1 & EL2 ON 30.9 13.9 16.6
3.0 3.6
EL1 ON 18.8
93 188
14.7 -
EL2 ON 12.8 - 17.9
EL1 & EL2 ON 27.5 14.4 17.4
3.0 3.8
EL1 ON 17.8
93 188
14.8 -
EL2 ON 12.0 - 18.0
EL1 & EL2 ON 26.3 14.6 17.6
3.0 4.0
EL1 ON 16.9
93 188
14.8 -
EL2 ON 11.4 - 18.0
EL1 & EL2 ON 25.0 14.6 17.7
3.0 4.2
EL1 ON 16.0
93 188
14.9 -
EL2 ON 10.8 - 18.1
EL1 & EL2 ON 24.0 14.7 17.8
Load size: EL1 = 10.8nF, EL2 = 9.3nF, total lamp size ~4.5in
2
100µH Coilcraft
LPS4012
3.3MΩ
2.0MΩ
825kΩ
VDD = 3.0V
0.1µF
2.2µF
Input Logic Control:
ON = 1.5V to VDD
OFF = 0V to 0.2V
GND
EN1
VDD
1
2
3
4
8 7
6
5
9
10
11
12
14
15
16 13
PWM
VREF
EN2
RSW-Osc
REL-Osc
VREG VOUT LX CS
EL1
COM1
EL2
COM2
HV861
EL1
EL2
3.3nF
100V NPO
BAS20
4.7µF
VIN = 3.2V to 4.2V
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
3
HV861DB1
Doc.# DSDB-HV861DB1
A032813
Bill of Materials
Note:
The above circuit may be optimized further based on specication of the lamp used.
Component Description Package Manufacturer Part Number
LX100µH shielded inductor --- Coilcraft LPS4012-104MLB
D1 200V fast recovery diode SOD-323 Diodes Inc. BAS20HT1
CIN 4.7µF, 10V ceramic chip capacitor 0805 Any ---
CS3.3nF, 100V, NPO chip capacitor 0805 NOVA CAP 0805N332K101NT
CDD 0.1µF, 16V ceramic chip capacitor 0805 Any ---
CREF 2.2uF, 16V ceramic chip capacitor 0805 Any ---
REL 1% 2MΩ chip resistor 0805 Any ---
RSW 1% 825kΩ chip resistor 0805 Any ---
RREG 1% 3.3MΩ chip resistor 0805 Any ---
RPWM chip resistor 0805 Any ---
U1 EL driver IC 16-Lead QFN Supertex HV861K7-G


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: HV861DB1

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