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A4403GEU-T

更新时间： 2024-01-04 19:20:45

品牌	Logo	应用领域
急速微 - ALLEGRO		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
15页	335K
描述
Valley Current Mode Control Buck Converter

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中文翻译

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技术参数
数据手册

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A4403GEU-T 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	QFN
包装说明：	HVQCCN, LCC16,.16SQ,25	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	1.69
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	CURRENT-MODE
控制技术：	PULSE FREQUENCY MODULATION	最大输入电压：	46 V
最小输入电压：	9 V	JESD-30 代码：	S-XQCC-N16
JESD-609代码：	e3	长度：	4 mm
湿度敏感等级：	2	功能数量：	1
端子数量：	16	最高工作温度：	105 °C
最低工作温度：	-40 °C	最大输出电流：	4.2 A
封装主体材料：	UNSPECIFIED	封装代码：	HVQCCN
封装等效代码：	LCC16,.16SQ,25	封装形状：	SQUARE
封装形式：	CHIP CARRIER	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	0.8 mm
子类别：	Switching Regulator or Controllers	表面贴装：	YES
切换器配置：	BUCK	最大切换频率：	2000 kHz
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	NO LEAD	端子节距：	0.65 mm
端子位置：	QUAD	处于峰值回流温度下的最长时间：	40
宽度：	4 mm	Base Number Matches：	1

A4403GEU-T 数据手册

Valley Current Mode Control Buck Converter

A4403

R_FILTERand C_FILTER(R7 and C7 in the Typical Application

diagram) should be placed close to the A4403 pins. The ground

sense should connect directly to the SGND and not to the power

ground.

Estimate the R_DS(on)of the buck switch at the given junction

temperature:

⎛

⎞

T_J– 25

⎜

⎟

R_DS(on)TJ= R_DS(on)25C

(20)

(21)

170

⎝

⎠

Support Components The bootstrap capacitor (C2) and soft-

start capacitor (C5) should be ceramic X5R or X7R.

The static loss for each switch can be determined:

Thermal Considerations To ensure the A4403 operates in

the safe operating area, which effectively means restricting the

junction temperature to less than 150°C, several checks should be

made. The general approach is to work out what thermal imped-

ance, R_JA, is required to maintain the junction temperature at

a given level, for a particular power dissipation. (Another factor

worth considering is that other power dissipating components

on the system PCB may influence the thermal performance of

the A4403. For example, the power loss contribution from the

recirculation diode and the sense resistor may cause the junction

temperature of the A4403 to be higher than expected.) It should

be noted that this process is usually an iterative one to achieve the

optimum solution.

P_STAT= I_LOAD× D(max) × R_DS(on)TJ

where I_LOADis the load.

(b) Switch dynamic losses

Both the turn-on and the turn-off losses can be estimated:

I_LOAD

P_DYN= V_IN(min)

× 5×

10^–9× f_SW× 1.6

(22)

where f_SWis the switching frequency.

At turn-on, an additional current spike flows into the switch, caus-

ing a loss as follows:

The following steps can be used as a guideline for determining

the R_JAfor a suitable thermal solution. :

C_DIODE× V_IN²× f_SW

P_DIODECAP

(23)

1. Estimate the maximum ambient temperature, T_A(max), of the

application.

where C_DIODEis the body capacitance of the Schottky diode (D1).

(d) Control losses

2. Define the maximum junction temperature, T_J(max). Note that

the absolute maximum is 150°C.

The control losses can be estimated as follows:

3. Determine the worst case power dissipation, P_D(max). This will

occur at maximum load and minimum V_IN. Contributors are:

P_CTRL= I_VINON× V_IN

(24)

where I_VINONis the quiescent current with the converter enabled.

(e) Gate charge losses

(a) Switch static losses

Estimate the maximum duty cycle:

Estimate the charge losses as follows:

V_OUT+ V_f

D (max) =

(19)

V_IN(min) + V_f

P_GATE= Q × f_SW× V_IN

(25)

where Q = 5 nC and is the charge that is required to turn on the

buck switch.

where V_fis the forward voltage drop of the Schottky diode (D1)

and sense resistor (R2, R3) under the given load current.

Allegro MicroSystems, Inc.

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

1...8 9 101112 13 14 15

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与A4403GEU-T相关器件

型号	品牌	获取价格	描述	数据表
A4403GEUTR-T	ALLEGRO	获取价格	Valley Current Mode Control Buck Converter
A4405	ALLEGRO	获取价格	The A4405 is an automotive power management IC that uses a high frequency constant on-time
A4406	ALLEGRO	获取价格	The A4406 is an automotive power management IC that uses a high frequency constant on-time
A4407	ALLEGRO	获取价格	The A4407 is an automotive power management IC that uses a 2.2 MHz constant on-time (COT)
A4408	ALLEGRO	获取价格	PWM frequency can be synchronized to external clock
A4408KLVTR-T	ALLEGRO	获取价格	PWM frequency can be synchronized to external clock
A4409	ALLEGRO	获取价格	Buck or buck-boost pre-regulator
A4409KLPTR-T	ALLEGRO	获取价格	Buck or buck-boost pre-regulator
A440F002300100	LITTELFUSE	获取价格	GAS DISCHARGE TUBE - 8x10mm
A440F002500100	LITTELFUSE	获取价格	GAS DISCHARGE TUBE - 8x10mm

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