Datasheet > AAT1239-1_0810

AAT1239-1_0810

更新时间： 2022-12-26 05:18:36

品牌	Logo	应用领域
ANALOGICTECH		转换器
页数	文件大小	规格书
23页	1104K
描述
40V Step-Up Converter for 4 to 10 White LEDs

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AAT1239-1_0810 数据手册

PRODUCT DATASHEET

AAT1239-1

SwitchReg^TM

40V Step-Up Converter for 4 to 10 White LEDs

Functional Block Diagram

LIN

PVIN

VIN

OVP

EN/SET

Control

Output

Select

Reference

SEL

AGND

PGND

a logic LOW applied to the SEL pin and 0.6V to 0.3V with

a logic HIGH applied to the SEL pin. The feedback volt-

age can be set to any one of 16 current levels within

each FB range, providing high-resolution control of the

LED current, using the single-wire S²Cwire control.

Functional Description

The AAT1239-1 consists of a DC/DC boost controller, an

integrated slew rate controlled input disconnect MOSFET

switch, and a high voltage MOSFET power switch. A high

voltage rectifier, power inductor, output capacitor, and

sense resistors are required to implement a DC/DC con-

stant current boost converter. The input disconnect

switch is activated when a valid input voltage is present

and the EN/SET pin is pulled high. The slew rate control

on the P-channel MOSFET ensures minimal inrush cur-

rent as the output voltage is charged to the input volt-

age, prior to the switching of the N-channel power

MOSFET. Monotonic turn-on is guaranteed by the inte-

grated soft-start circuitry. Soft-start eliminates output

voltage overshoot across the full input voltage range and

all loading conditions.

For some applications requiring a short duration of

boosting current applying a low-to-high transition on the

AAT1239-1’s SEL pin, LED current can be programmed

up to 3x. The step size is determined by the programmed

voltage at the FB pin where the internal default setting

is 1.5x in the AAT1239-1.

Control Loop

The AAT1239-1 provides the benefits of current mode

control with a simple hysteretic output current loop pro-

viding exceptional stability and fast response with mini-

mal design effort. The device maintains exceptional

constant current regulation, transient response, and

cycle-by-cycle current limit without additional compen-

sation components.

The maximum current through the LED string is set by

the ballast resistor and the feedback voltage of the IC.

The output current may be programmed by adjusting

the level of the feedback reference voltage which is pro-

grammed through the S²Cwire interface. The SEL pin

selects one of two feedback voltage ranges. In the

AAT1239-1, the SEL function is inverted in that the FB

pin voltage can be programmed from 0.4V to 0.1V with

The AAT1239-1 modulates the power MOSFET switching

current to maintain the programmed FB voltage. This

allows the FB voltage loop to directly program the

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1239-1.2008.10.1.2

1...6 7 8910 11 12...23

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