Datasheet > AAT1236IRN-T1

AAT1236IRN-T1

更新时间： 2024-01-08 09:04:27

品牌	Logo	应用领域
AAT		驱动器接口集成电路
页数	文件大小	规格书
24页	1012K
描述
High Efficiency White LED Drivers for Backlight and Keypad

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AAT1236IRN-T1 技术参数

生命周期：	Transferred	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.68
Base Number Matches：	1

AAT1236IRN-T1 数据手册

AAT1236

High Efficiency White LED Drivers

for Backlight and Keypad

Inductance Max DC I_SAT

DCR

Size (mm)

LxWxH

Manufacturer

Part Number

(µH)

Current (A)

( )

Type

Sumida

CDRH4D22/HP-2R2

CDR4D11/HP-2R4

CDRH4D18-2R2

LQH662N2R2M03

LQH55DN2R2M03

NR4018T2R2

2.2

2.4

2.2

2.50

1.70

1.32

3.30

3.20

2.70

1.48

1.90

1.48

1.12

105

5.0x5.0x2.4

4.8x4.8x1.2

5.0x5.0x2.0

6.3x6.3x4.7

5.0x5.7x4.7

4.0x4.0x1.8

3.0x3.0x1.5

3.8x3.8x1.4

3.1x3.1x1.4

3.1x3.1x1.2

Shielded

Non-Shielded

Shielded

Sumida

Murata

Taiyo Yuden

Coiltronics

NR3015T2R2

SD3814-2R2

SD3114-2R2

SD3112-2R2

140

Table 5: Typical Surface Mount Inductors for Various Output Loads (select I_PEAK< I_SAT).

Manufacturer

Part Number

Value (µF) Voltage Rating Temp Co Case Size

Murata

GRM188R60J225KE19

GRM21BR71A225KA01

GRM219R61E225KA12

GRM21BR71E225KA73L

GRM21BR61E475KA12

2.2

4.7

6.3

X5R

X7R

X5R

X7R

X5R

0603

0805

Table 6: Recommended Ceramic Capacitors.

The output capacitor is selected to maintain the

output load without significant voltage droop

(ΔV_OUT) during the power switch ON interval, when

the output diode is not conducting. A ceramic out-

put capacitor from 2.2µF to 4.7µF is recommended

(see Table 6).

Output capacitor size can be estimated at a switch-

ing frequency (F_S) of 500kHz (worst case):

I_OUT· D_MAX

F_S· ΔV_OUT

C_OUT

To maintain stable operation at full load, the output

capacitor should be selected to maintain ΔV_OUT

between 100mV and 200mV.

Typically, 25V rated capacitors are required for the

24V maximum boost output. Ceramic capacitors

selected as small as 0805 are available which meet

these requirements.

The boost converter input current flows during both

ON and OFF switching intervals. The input ripple

current is less than the output ripple and, as a

result, less input capacitance is required.

MLC capacitors exhibit significant capacitance reduc-

tion with applied voltage. Output ripple measure-

ments should confirm that output voltage droop and

operating stability are within acceptable limits.

Voltage derating can minimize this factor, but results

may vary with package size and among specific

manufacturers.

1236.2007.02.1.1

1...17 18 192021 22 23 24

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