HV839MG Supertex, HV839MG Datasheet - Page 7

• Manufacturer Part Number: HV839MG
• Description: Display Drivers Dual EL Lamp Drvr
• Manufacturer: Supertex

Specifications of HV839MG

• Driver Type: EL Lamp Drivers
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: MSOP-10
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pin Description
Pin #
10
1
2
3
4
5
6
7
8
9
RSW-Osc
Supertex inc.
Name
COM
GND
VDD
EL2
EL1
CS
C1
C2
LX
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.
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.
The switching frequency increases as the value of R
a switching frequency of 64.0kHz, and an EL lamp frequency of 500Hz. To change the frequency
to f
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.
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
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.
Connect a 100V capacitor between this pin and GND. This capacitor stores the energy transferred
from the inductor.
Common connection for both EL lamps. Connect one end of both the lamps to this pin.
EL lamp 2 connection. For optimum performance, the smaller of the two lamps should be con-
nected to this pin.
EL lamp 1 connection. For optimum performance, the larger of the two lamps should be connected
to this pin.
R
EL1
SW-OSC1
, the value of the resistor R
= (220 x 500) / f
1235 Bordeaux Drive, Sunnyvale, CA 94089
EL1
kΩ.
SW-OSC1
7
can be determined as:
Tel: [phone]
SW-OSC
decreases. A 220kΩ resistor will provide
www.supertex.com
HV839