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| HV843DB1 Datasheet, PDF (2/2 Pages) Supertex, Inc – Low Noise, Dual EL Lamp Driver | |||
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Figure1: HV843DB1 Circuit Schematic
VIH = ON
VIH = ON 0 = OFF
0 = OFF
+
VDD
-
CDD 0.1µF
+
VIN
-
CIN 4.7µF
1
C1
2
RSW-OSC 3 VDD
RSW-OSC
4
C2
5
GND
10
EL1
EL2 9
Com 8
CS 7
LX 6
HV843K7-G
EL Lamp 1
HV843DB1
EL Lamp 2
1N4148
LX
CS
3.3nF
Typical Performance
The speciï¬c external components used in the above circuit are: RSW = 845kΩ, LX = 330μH Coilcraft (LPS3010-334ML), CS= 3.3nF 100V NPO.
The following performance was observed when driving EL1 = 1.3in2 and EL2 = 0.93in2 green lamps.
VDD (V)
VIN (V)
3.3
3.0
3.7
4.2
Lamp
EL ON
1
EL2 ON
EL1 and EL2 ON
EL1 ON
EL2 ON
EL1 and EL2 ON
EL1 ON
EL2 ON
EL1 and EL2 ON
IIN (mA)
8.96
6.96
12.35
7.65
5.98
11.13
6.19
4.79
8.51
VCS (VPEAK)
fEL (Hz)
88
195
Lamp Brightness (cd/m2)
EL1
EL2
17.04
-
-
16.36
16.17
14.72
17.45
-
-
16.78
16.64
15.79
17.71
-
-
17.20
17.27
16.20
Bill of Materials
Components Description
Package
Manufacturer
LX
CS
RSW
CIN
C
DD
Diode
330μH Inductor
3.3nF, 100V, NPO chip capacitor
1%, 845kΩ chip resistor
4.7μF, 10V ceramic chip capacitor
0.1μF, 16V ceramic chip capacitor
100V fast recovery diode
---
0805
0805
0805
0805
SOT-23
Coilcraft
Novacap
Any
Any
Any
Diodes Inc
U1
EL driver IC
MLP/DFN-10 Supertex Inc
The above circuit may need to be optimized further based on speciï¬cation of the lamp used.
Part Number
LPS3010-334ML
0805N332K101NT
---
---
---
1N4148
HV843K7-G
062206
2
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