Datasheet > ADT6780

ADT6780

更新时间： 2022-10-09 10:37:32

品牌	Logo	应用领域
ADTECH		驱动器
页数	文件大小	规格书
13页	490K
描述
Thermally enhanced Low VFB Step-Down LED Driver

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中文翻译

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数据手册

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ADT6780 数据手册

Thermally enhanced Low V_FBStep-Down LED Driver

ADT6780

LED PWM Dimming

The LED brightness can be controlled by applying a pulse-width modulation(PWM) signal to the EN pin.

PWM frequency is limited by turn-on and turn-off time of the LED current. So, Using a PWM dimming

application, soft-start time control capacitor, C4 is not used for higher PWM dimming frequency. PWM

frequency is recommended in range of 100Hz to 1kHz to get a good dimming linearity.

APPLICATION INFORMATION

Figure 1 is the typical ADT6780 application circuit. And Figure 2 is the functional block diagram of the

ADT6780. For the application information, refer to the Figure 1 & 2 unless otherwise noted.

LED Current Resistor Selection

The LED current is set with a current sense resistor R1 between FB and GND. It is recommended to use 1%

tolerance or better resistor. LED current is calculated by the below equation.

0.2V

I_LED

For 1A LED current, choose R1 = 0.2Ω

Inductor

The inductor required to supply constant current to the output load when it is driven by a switching voltage.

For given input and output voltage, inductance and switching frequency together decide the inductor ripple

current, that is:

⎛

⎞

V_OUT

V_IN

⎜

⎟

ΔI_L=

× 1−

⎜

⎝

F ×L

⎠

ΔI_L

The peak inductor current is:

I_L.peak= I_OUT

Higher inductance gives low inductor ripple current but requires larger size inductor to avoid saturation.

Low ripple current reduces inductor core losses. Also it reduces RMS current through inductor and switches,

which results in less conduction loss. Usually, peak to peak ripple current on inductor is designed to be 20%

to 30% of the output current limit. Make sure it is capable to handle the peak current without saturation.

Surface mount inductors in different shape and styles are available from TDK, TOKO and Murata. Shielded

inductors are small and radiate less EMI noise. But they cost more than unshielded inductors. The choice

depends on EMI requirement, price and size.

Output Freewheeling Diode

When the high side switch is off, freewheeling diode supplies the current to the inductor. The forward

voltage and reverse recovery times of the freewheeling diode are the key loss factors, so schottky diode is

mostly used for the freewheeling diode. Choose a diode whose maximum reverse voltage rating is greater

than the maximum input voltage, and whose current rating is greater than the maximum load current.

* This specifications are subject to be changed without notice

http://www.ad-tech.co.kr

Jul. 12. 2012 / Preliminary

8/13

1...5 6 789 10 11...13

中文翻译

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