Datasheet > A8513KLPTR-3-T

A8513KLPTR-3-T

更新时间： 2022-10-08 15:46:29

品牌	Logo	应用领域
急速微 - ALLEGRO		驱动器
页数	文件大小	规格书
24页	929K
描述
Wide Input Voltage Range, High Efficiency Fault Tolerant LED Driver

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A8513KLPTR-3-T 数据手册

Wide Input Voltage Range, High Efficiency

Fault Tolerant LED Driver

A8513

capacitors. After the A8513 senses there is enough voltage on the

LED pin, it increases the LED current to the preset regulation

current. The COMP pin will continue to source 80 uA until the

LEDs are able to run at the full preset current level.

LED current setting and LED dimming

The LED current, I_LED, is set using the ISET pin, and can range

from 40 to 150 mA. Connect a resistor, R_ISET, between this pin

and GND to set the I_LEDcurrent, according to the following

formula :

Boost converter frequency

The switching frequency of the boost regulator is preset internally

to one of four frequencies. The frequency options are:

V_ISET

I_LED

× A_ISET

(2)

R_ISET

1.003 V

R_ISET

× 1045

Switching Frequency (f_SW

)

Part Number

(MHz)

where I_LEDis in A and R_ISETis in Ω.

A8513KLYTR-1-T

A8513KLYTR-2-T

A8513KLYTR-3-T

A8513KLYTR-4-T

This formula sets the maximum current through the LEDs, which

is referred to as the 100% current.

0.5

0.25

PWM dimming

The LED current can be reduced from the 100% current level by

PWM dimming using the EN/PWM pin. When the EN/PWM pin

is pulled high, the A8513 turns on and the LED pin sinks 100%

current (figure 4). When EN/PWM is pulled low, the boost con-

verter and LED sink are turned off. The compensation (COMP)

pin is floated, and critical internal circuits are kept active.

COMP

V_LED

I_LED

The A8513 has very fast turn-on and turn-off times during PWM

dimming to minimize low PWM duty cycle errors. The typical

PWM signal delay t_dPWM(on)is 250 ns (figure 5). The typical

t_dPWM(off)time, between the PWM signal and the LED current

going low, is shown in figure 6.

EN/PWM

Analog dimming

Figure 4. Typical PWM dimming sequence, with PWM dimming frequency

of 1000 Hz and 10% duty cycle; shows COMP (ch1, 1 V/div.), V_LED(ch2,

10 V/div.), I_LED(ch3, 100 mA/div.), and EN/PWM (ch4, 5 V/div.),

time = 500 μs/div.

The A8513 can also be dimmed by using an external DAC or

other voltage source applied either directly to the ground side of

the R_ISETresistor or through an external resistive divider to the

I_LED

EN/PWM

Figure 5. Typical EN/PWM signal (5 V/div.) to LED current (100 mA/div.)

turn-on delay. The delay measured about 250 ns. V_INis 12 V, V_OUTfor 10

series LEDs is approximately 36 V, I_LEDis 150 mA. (time = 500 ns/div.)

Figure 5. Typical EN/PWM signal (5 V/div.) to LED current (100 mA/div.)

turn-off delay. The typical delay is about 250 ns. (time = 500 ns/div.)

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

1...7 8 91011 12 13...24

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