HV839

6

Pin Configuration and Description

Pin #

Name

Function

1

Enable input signal for EL lamp 1. Logic high will turn ON the EL lamp 1 and logic low will

turn it OFF. Refer Function Table.

2

Input supply voltage pin.

3

External resistor connection to set both the switching MOSFET frequency and EL Lamp

EL lamp frequency is switching frequency divided by 128.

provide a switching frequency of 64.0 kHz, and an EL lamp frequency of 500 Hz.

4

Enable input signal for EL lamp 2. Logic high will turn ON the EL lamp 2 and logic low will

turn it OFF. Refer Function Table.

5

GND

IC Ground Pin.

6

External inductor connection to boost the low input voltage using inductive flyback. Connect

Also connect a high voltage fast recovery diode

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

7

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

EL lamp 2 connection. For optimum performance, the smaller of the two lamps should be

connected to this pin.

10

EL lamp 1 connection. For optimum performance, the larger of the two lamps should be

connected to this pin.

A033106