Datasheet > 电源电路 > 开关式稳压器或控制器> A4403GEU-T

A4403GEU-T

更新时间： 2024-02-28 10:02:04

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

The amount of capacitance required for a given ripple voltage can The sense resistor value is selected depending on the maximum

output load current. The typical sense voltage that causes a cur-

rent limit is 180 mV. So, for example, a 50 mΩ value would be

appropriate for a maximum load of 3 A, as it allows for margin

between maximum load and the current limit. A tolerance of up to

±5% is acceptable.

be found:

I_rms× T_on

C_IN

(15)

V_RIPPLE

As mentioned in the previous section, E-field biasing effects

can reduce the actual capacitance and this should be taken into

account when making the selection.

The power rating of the resistor has to be considered. The current

flowing in the resistor is essentially the same as the current flow-

ing through the recirculation diode, although the power dissipa-

tion is worked out using the RMS current.

Again, there is generally no need to consider the heating effects

of the RMS current flowing through the ESR of a ceramic

capacitor. If an electrolytic device is used, then the ripple current

rating should be considered. Note that most manufacturers only

consider the RMS current rating at 100 kHz.

To a first approximation, the sense resistor dissipation can be

worked out as:

P_SENSE= I_LOAD× (1 – D(min)) × R_SENSE

(18)

Recirculation Diode This diode (D1) conducts during the

switch off-time. A Schottky diode is recommended to minimize

both the forward drop and switching losses. The worst-case

dissipation occurs at maximum V_IN, when the duty cycle is at a

minimum.

For a converter working with a load of 3 A, a very narrow duty

cycle, and a sense resistor of 50 mΩ, the power dissipation would

be 450 mW.

The optimal solution from a cost perspective is to use two

100 mΩ, 1206-style resistors connected in parallel. Each resistor

is generally rated at 250 mW at 70°C ambient. Check the vendor

datasheet to verify the maximum ambient at full power.

The average current through the diode can be found:

_DIODE(av)= I_LOAD× (1 – D (min)) .

(16)

When laying out the PCB, it is essential that the sense resistor

connections, carrying the power current (see figure 3), are as

short and wide as possible to minimize the effects of leakage

inductance noise. In addition, the Kelvin sense circuit connec-

tions should be as close to the sense resistor pads as possible.

The forward voltage drop, V_f, can be found from the diode

characteristics by using the actual load current (not the average

current).

The static power dissipation can be found:

P_STAT= I_DIODE(av)× V_f

(17)

Kelvin

It is also important to take into account the thermal rating of

connection

the package, R_θJA, and the ambient temperature, to ensure that

enough heatsinking is provided to maintain the diode junction

temperature within the safe operating area for the device.

ISEN

R_FILTER

47 Ω

Power

current

To minimize the heating effects from the A4403 on the diode and

vice-versa, it is recommended that the diode be mounted on the

reverse side of the printed circuit board.

R_SENSE

A4403

C_FILTER

1 nF

SGND

Sense Resistor The sense resistor should be a surface mount

package, with low inductance. On no account should a wire-

wound or through hole package be used. To prevent potential

mistriggering problems from occurring in noisy systems, it is

recommended that an R-C filter be applied across the sense resis-

tor, as shown in figure 3.

Kelvin

connection

Figure 3. R-C filter added to the current sense circuit

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1...7 8 91011 12 13...15

中文翻译

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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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