Datasheet > HV843

HV843

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
超科 - SUPERTEX		驱动器
页数	文件大小	规格书
6页	429K
描述
Low Noise Dual EL Lamp Driver

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HV843 数据手册

HV843

Split Supply Conﬁguration

The HV843 can be used in applications operating from a the internal logic is less than 200µA. Therefore, the regu-

battery where a regulated voltage is available. This is shown lated voltage could easily provide the current without being

in Figure 2. The regulated voltage can be used to drive the loaded down.

internal logic of HV843. The amount of current used to drive

Figure 2 - Split Supply Conﬁguration

V_IH= ON

0 = OFF

EL Lamp 1

_IH= ON

0 = OFF

C₁

EL₁

EL₂

V_DD

EL Lamp 2

R_SW-OSC

Regulated Voltage = V_DD

Com

R_SW-OSC

C_DD

C_S

L_X

C₂

GND

HV843K7-G

Battery Voltage = V_IN

L_X

C_IN

C_S

Pin Conﬁguration and Description

Pin # Function Description

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.

C₁

V_DD

Input voltage supply pin.

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

The external resistor should be connected between V_DDand this pin. The EL lamp frequency is the

switching frequency divided by 512. The switching frequency is inversely proportional to the resis-

tor value. A 845kΩ resistor will provide a nominal switching frequency of 102kHz and an EL lamp

frequency of 200Hz. To change the frequency to f_EL1, the value of the resistor R_SW-OSC1can be deter-

mined as R_SW-OSC1= (845 x 200) / f_EL1kΩ.

R_SW-OSC

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.

C₂

GND

Device ground.

Drain of internal switching MOSFET. Connection for an external inductor. 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 C_Spin.

L_X

Connect a 100V capacitor between this pin and GND. This capacitor stores the energy transferred

from the inductor.

C_S

COM

EL₂

Common lamp connection for both EL₁and EL₂. 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 connected

to this pin.

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

to this pin.

EL₁

1 2 3 456

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