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AAT1156IVN-T1

更新时间： 2024-02-04 18:39:44

品牌	Logo	应用领域
ANALOGICTECH		转换器稳压器开关式稳压器或控制器电源电路开关式控制器
页数	文件大小	规格书
14页	425K
描述
1MHz 700mA Step-Down DC-DC Converter

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中文翻译

获取价格

技术参数
数据手册

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AAT1156IVN-T1 技术参数

生命周期：	Active	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.69
Is Samacsys：	N	Base Number Matches：	1

AAT1156IVN-T1 数据手册

AAT1156

1MHz 700mA Step-Down DC-DC Converter

Thermal Calculations

There are three types of losses associated with the AAT1156: MOSFET switching losses, conduction losses,

and quiescent current losses. The conduction losses are due to the R_DS(ON)characteristics of the internal P-

and N-channel MOSFET power devices. At full load, assuming continuous conduction mode (CCM), a simpli-

fied form of the total losses is given by:

I_O²⋅ (R_DSON(HS)⋅ V_O+ R_DSON(LS)⋅ (V_IN- V_O))

P =

+ (t_sw⋅ F ⋅ I_O⋅ V_IN+ I_Q) ⋅ V_IN

V_IN

where I_Qis the AAT1156 quiescent current.

Once the total losses have been determined, the junction temperature can be derived from the θ_JAfor the

QFN33-16 package.

T_J= P · Θ_JA+ T_AMB

Adjustable Output

Resistors R3 and R4 of Figure 1 force the output to regulate higher than 0.6V. The optimum value for R4 is

59kΩ. Values higher than this may cause problems with stability, while lower values can degrade light load

efficiency. For a 2.5V output with R4 set to 59kΩ, R3 is 187kΩ.

2.5V

0.6V

⎛

⎝

⎞

⎛

⎝

⎞

⎠

R3 =

-1 · R4 =

- 1 · 59kΩ = 187kΩ

⎠

REF

500

R4=59kΩ

450

400

350

300

250

200

150

100

1.5

2.5

3.5

4.5

5.5

Output Voltage (V)

Figure 4: R3 vs. V_OUTfor Adjustable Output Using the AAT1156.

1156.2005.11.1.2

1...7 8 91011 12 13 14

中文翻译

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