HV843 Datasheet, PDF (4/6 Pages) Supertex, Inc – Low Noise Dual EL Lamp Driver

Figure 1 - Test Circuit
V_IH = ON
0 = OFF
V_IH = ON
0 = OFF
+
V_DD
-
C_DD
0.1µF
+
V_IN
-
C_IN
4.7µF
845kΩ
1
C1
2
VDD
3
RSW-OSC
4 _C2
5 _GND
EL1 ¹⁰
EL2 ⁹
Com ⁸
CS ⁷
6
LX
HV843K7-G
2.1in² EL Lamp 1***
1.8in² EL Lamp 2***
620Ω _13nF
620Ω _11nF
1N4148*
L_X
330µH**
C_S
3.3nF, 100V
HV843
* _{or any (equivalent or better) > 90V, fast recovery diode}
** _{Cooper LPO6610-334MLB}
*** The bigger sized lamp should be tied to EL1 and the smaller
sized lamp to EL2 (pins 10 and 9 respectively)
Typical Performance
Lamp
EL₁ ON
EL₂ ON
Both EL₁ and EL₂ ON
EL₁ ON
EL₂ ON
Both EL₁ and EL₂ ON
EL₁ ON
EL₂ ON
Both EL₁ and EL₂ ON
V_DD (V)
3.0V
V_IN (V)
5.2V
5.5V
5.8V
I_IN (mA) V_CS (V_PEAK) f_EL (Hz)
7.96
6.91
13.93
7.47
6.42
88
195
13.42
7.04
6.01
12.94
Lamp Brightness (cd/m²)
EL₁
EL₂
13.89
-
-
12.89
13.02
11.24
13.93
-
-
13.22
13.30
12.05
14.03
-
-
13.30
13.55
12.51
4