Datasheet > AAT1272IWO-T1

AAT1272IWO-T1

更新时间： 2024-02-08 15:52:38

品牌	Logo	应用领域
ANALOGICTECH		/
页数	文件大小	规格书
20页	2644K
描述
Switching Regulator/Controller,

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技术参数
数据手册

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AAT1272IWO-T1 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.83
接口集成电路类型：	LED DISPLAY DRIVER	峰值回流温度（摄氏度）：	NOT SPECIFIED
处于峰值回流温度下的最长时间：	NOT SPECIFIED	Base Number Matches：	1

AAT1272IWO-T1 数据手册

PRODUCT DATASHEET

AAT1272

SwitchReg

1.5A Step-Up Current Regulator for Flash LEDs

Bits [5:4] Program the FLOUTA and FLOUTB with four ON/OFF configurations.

Bits [3:0] Program the flash-to-movie mode ratio with 16 different fractions from the hardware configuration, RSET.

MSB

LSB

Flash-to-Movie

Mode Ratio

0000 = 1/2

0001 = 1/3.8

0010 = 1/5.5

0011 = 1/7.3 (default)

0100 = 1/8.9

0101 = 1/10.5

0110 = 1/12.2

0111 = 1/13.8

1000 = 1/14.9

1001 = 1/16.5

1010 = 1/18

1011 = 1/19.6

1100 = 1/21.1

1101 = 1/22.6

1110 = 1/24

1111 = OFF

FLOUTA FLOUTB

OFF

OFF*

OFF (default)

OFF*

*with 2-3mA standby current

Figure 7: AAT1272 Register 1 Programming.

is equal to the DC plus AC ripple components. Under

worst case RMS conditions, the current waveform is

critically continuous. The resulting RMS calculation yields

worst case inductor loss. The RMS current value should

be compared against the inductor manufacturer’s tem-

perature rise, or thermal derating guidelines:

Selecting the Boost Inductor

The AAT1272 controller utilizes PWM control and the

switching frequency is fixed. To maintain 2MHz maximum

switching frequency and stable operation, a 1ꢀH inductor

is recommended. Manufacturer’s specifications list both

the inductor DC current rating, which is a thermal limita-

tion, and peak inductor current rating, which is deter-

mined by the saturation characteristics. Measurements

at full load and high ambient temperature should be per-

formed to ensure that the inductor does not saturate or

exhibit excessive temperature rise.

I_PEAK

I_RMS

For a given inductor type, smaller inductor size leads to

an increase in DCR winding resistance and, in most

cases, increased thermal impedance. Winding resistance

degrades boost converter efficiency and increases the

inductor’s operating temperature:

The inductor (L) is selected to avoid saturation at mini-

mum input voltage and maximum output load conditions.

Worst-case peak current occurs at minimum input volt-

age (maximum duty cycle) and maximum load. Bench

measurements are recommended to confirm actual I_PEAK

and to ensure that the inductor does not saturate at

maximum LED current and minimum input supply volt-

age. The RMS current flowing through the boost inductor

P_{LOSS(INDUCTOR)}= I²_RMS· DCR

*Denotes the default value.

w w w . a n a l o g i c t e c h . c o m

1272.2009.04.1.2

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