HV839K6-G 查看數據表（PDF） - Supertex Inc
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HV839K6-G Datasheet PDF : 9 Pages
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HV839
Pin Description
Pin #
Name Function
1
C1
Enable input signal for EL lamp 1. Logic high will turn ON the EL lamp 1 and logic low will turn it
OFF. Refer to the Function Table.
2
VDD Input supply voltage pin.
External resistor connection to set both the switching MOSFET frequency and EL Lamp frequency.
The external resistor should be connected between this pin and the VDD pin. The EL lamp fre-
quency is switching frequency divided by 128.
3
RSW-Osc The switching frequency increases as the value of RSW-OSC decreases. A 220kΩ resistor will provide
a switching frequency of 64.0kHz, and an EL lamp frequency of 500Hz. To change the frequency
to fEL1, the value of the resistor RSW-OSC1 can be determined as:
RSW-OSC1 = (220 x 500) / fEL1 kΩ.
4
C2
Enable input signal for EL lamp 2. Logic high will turn ON the EL lamp 2 and logic low will turn it
OFF. Refer to the Function Table.
5
GND IC Ground Pin.
External inductor connection to boost the low input voltage using inductive flyback. Connect an
inductor between VIN and this pin. Also connect a high voltage fast recovery diode between this
pin and the CS pin. The anode of the diode needs to be connected to the LX pin and the cathode to
the CS pin. In general, small valued inductors, which can handle more current, are more suitable
6
LX
for driving large sized lamps. As the inductor value decreases, the switching frequency should be
increased to avoid saturation.
When the switching MOSFET is turned ON, the inductor is being charged. When the MOSFET
is turned OFF, the energy stored in the inductor is transferred to the high voltage capacitor con-
nected at the CS pin.
7
CS
Connect a 100V capacitor between this pin and GND. This capacitor stores the energy transferred
from the inductor.
8
COM Common connection for both EL lamps. Connect one end of both the lamps to this pin.
9
EL2
EL lamp 2 connection. For optimum performance, the smaller of the two lamps should be con-
nected to this pin.
10
EL1
EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected
to this pin.
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
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