HV831 데이터 시트보기 (PDF) - Supertex Inc
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HV831 Datasheet PDF : 8 Pages
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Pin Configuration and Description
HV831
Pin #
1
Name
C1
Function
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 frequency is switching frequency
divided by 128.
3
RSW-OSC
The switching frequency increases as the value of RSW-OSC decreases. A 470kΩ resistor will provide a switching
frequency of 31.2 kHz, and an EL lamp frequency of 244 Hz. To change the frequency to fSW1, the value of the
resistor RSW-OSC1 can be determined as RSW-OSC1 = (470 x 244) / fEL1MΩ.
4
C
2
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,
6
LX
small valued inductors, which can handle more current, are more suitable 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 connected 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 connected to this pin.
10
EL1
EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected to this pin.
6
A081005
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