Datasheet > A9913E6VR

A9913E6VR

更新时间： 2022-02-26 12:26:31

品牌	Logo	应用领域
创瑞 - AITSEMI		驱动输入元件
页数	文件大小	规格书
8页	296K
描述
AC INPUT LED CONSTANT CURRENT DRIVER

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A9913E6VR 数据手册

A9913

AC-DC LED DRIVER

AiT Semiconductor Inc.

www.ait-ic.com

85~265V AC INPUT LED CONSTANT CURRENT DRIVER

DETAILED INFORMATION

Application Information

The A9913 is optimized to drive buck LED drivers using open-loop peak current mode control. This method of

control enables fairly accurate LED current control without the need for high side current sensing or the

design of any closed loop controllers. The IC uses very few external components and enables both Linear and

PWM dimming of the LED current.

A capacitor connected to the T_OFFpin programs the off-time. The oscillator produces pulses at regular

intervals. These pulses set the SR flip-flop in the A9913 which causes the GATE driver to turn on. When the

FET turns on, the current through the inductor starts ramping up. This current flows through the external

sense resistor R_CSand produces a ramp voltage at the CS pin. The comparators are constantly comparing the

CS pin voltage to both the voltage at the LD pin and the internal 500mV. Once the blanking timer is complete,

the output of these comparators is allowed to reset the flip flop. When the output of either one of the two

comparators goes high, the flip flop is reset and the GATE output goes low. The GATE goes low until the SR

flip flop is set by the oscillator. Assuming a 30% ripple in the inductor, the current sense resistor R_CScan be

set using:

A constant off-time peak current control scheme can easily operate at duty cycles greater than 0.5 and also

gives inherent input voltage rejection making the LED current almost insensitive to input voltage variations.

Input Voltage Regulator

When a voltage is applied at the decent resistor, the A9913 maintains a constant 6.5V at the V_INpin. This

voltage is used to power the IC and any external resistor dividers needed to control the IC. The V_INpin must

be bypassed by a low ESR capacitor to provide a low impedance path for the high frequency current of the

output GATE driver.

The input current draw from the V_INpin is a sum of the 1.0mA current draw by the internal circuit and the

current drawn by the GATE driver (which in turn depends on the switching frequency and the GATE charge of

the external FET).

The IC is allowed of input maximum current draw from the V_INpin is about 20mA, so the resistor between V_IN

pin and V_INinput can be set using:

REV1.0

- NOV 2013 RELEASED -

- 5 -

1 2 3 456 7 8

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