Datasheet > HV860

HV860

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
7页	315K
描述
Low Noise Dimmable EL Lamp Driver

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HV860 数据手册

HV860

Audible Noise Reduction

The EL lamp, when lit, emits an audible noise. This is due The HV860 employs a proprietary circuit to help minimize

to EL lamp construction. The audible noise generated by the the EL lamp’s audible noise by using a single resistor, R_REG

EL lamp can be a major problem for applications where the as shown in Figure 5.

EL lamp is held close to the ear, such as cellular phones.

Figure 5: Typical Application Circuit for Audible Noise Reduction

V_IN

C_IN

L_X

R_REG

C_S

V_REG

V_DD

V_REFL_X

C_S

V_DD

R_SW

C_DD

R_SW-OSC

R_EL-OSC

V_A

V_B

Lamp

R_EL

1.5V = On

0V = Off

GND

HV860K7

How to Minimize EL Lamp Audible Noise

The audible noise from the EL lamp can be minimized with to ground. EL lamp noise can be minimized without much

the proper selection of R_REG. R

is connected between loss in brightness by setting the RC time constant to be

the V_REFand V_REGpins. V_REGhas^Ra^En^Ginternal 60pF capacitor approximately 1/12^THof the EL frequency’s period.

EL Lamp Dimming using PWM

This section describes the method of dimming the EL lamp. resistor. An n-channel open drain PWM signal is used to pull

Reducing the voltage amplitude at the V_REGpin will reduce the 10kΩ resistor to ground. The effective voltage on the

the voltage on the V_CSpin, which will effectively reduce the

pin will be proportional to the duty cycle of the PWM

peak the peak voltage the EL lamp sees. Figure 5 shows a si^Rg^En^Gal. The PWM operating frequency can be anywhere

circuit to dim the lamp by changing the duty cycle of a PWM between 20kHz to 100kHz.

signal. A 10kΩ resistor is connected in series with a 3.3MΩ

Figure 6: PWM Dimming Circuit

V_IN

4.7μF

220μH

Open Drain

n-channel

PWM Signal

(Cooper Inductor SD3814-221)

10kΩ

V_REF

3.3MΩ

L_X

C_S

BAS21

3.3nF

200V

V_REG

V_DD

1.0MΩ

2.0MΩ

V_DD

0.1μF

R_SW-OSC

R_EL-OSC

V_A

V_B

EL Lamp

On = 1.5V

Off = 0V

GND

HV860K7

NR040306

1...3 4 567

中文翻译

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