Datasheet > AAT1239ITP-1

AAT1239ITP-1

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		转换器
页数	文件大小	规格书
23页	1061K
描述
40V Step-Up Converter for 4 to 10 White LEDs

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AAT1239ITP-1 数据手册

PRODUCT DATASHEET

AAT1239-1

SwitchReg^TM

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

2. Minimize the distance between L1 to DS1 and

switching pin SW; minimize the size of the PCB area

connected to the SW pin.

3. Maintain a ground plane and connect to the IC PGND

pin(s) as well as the GND terminals of C1 and C2.

4. Consider additional PCB area on DS1 cathode to

maximize heatsinking capability. This may be neces-

sary when using a diode with a high V_Fand/or ther-

mal resistance.

5. To avoid problems at startup, add a 10kΩ resistor

between the VIN, VP and EN/SET pins (R4). This is

critical in applications requiring immunity from input

noise during “hot plug” events, e.g. when plugged

into an active USB port.

PCB Layout Guidelines

Boost converter performance can be adversely affected

by poor layout. Possible impact includes high input and

output voltage ripple, poor EMI performance, and

reduced operating efficiency. Every attempt should be

made to optimize the layout in order to minimize para-

sitic PCB effects (stray resistance, capacitance, and

inductance) and EMI coupling from the high frequency

SW node. A suggested PCB layout for the AAT1239-1

boost converter is shown in Figures 9 and 10. The fol-

lowing PCB layout guidelines should be considered:

1. Minimize the distance from Capacitor C1 and C2

negative terminal to the PGND pins. This is espe-

cially true with output capacitor C2, which conducts

high ripple current from the output diode back to the

PGND pins.

Figure 9: AAT1239-1 Evaluation

Board Top Side Layout (with ten LEDs

and microcontroller).

Figure 10: AAT1239-1 Evaluation

Board Bottom Side Layout (with ten LEDs

and microcontroller).

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1239-1.2008.06.1.1

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