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A4403GEU-T

更新时间： 2024-01-07 07:33:07

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

(f) The total losses can now be estimated:

150

10^–12× 42²×1×10⁶

P_TOTAL= P_STAT+P_DYN+P_DIODECAP+P_CTRL+P_GATE. (26)

P_DIODECAP

= 0.132 W

4. The thermal impedance required for the solution can now be

determined:

(d) Control losses (equation 24):

T_J– T_A

P_CTRL= 0.004 × 42 = 0.168 W

(e) Gate charge losses (equation 25):

P_GATE= 5×10 ^–9× 1 × 10⁶× 42 = 0.21 W

(f) Total losses (equation 26):

R_QJA

(27)

P_TOTAL

Note that if a four-layer high thermal efficiency board is used, a

thermal impedance of around 30°C/W can be achieved.

Example

P_TOTAL= 0.433 + 0.504 + 0.132 + 0.168 + 0.21 = 1.447 W

Given selected parameters:

Thermal impedance (equation 27):

V_IN(min) = 42 V,

115 – 70

1.447

V_OUT= 3.3 V at 3 A,

f_SW= 1 MHz,

R_QJA

= 31°C/W

For this particular solution, a PCB with high thermal efficency is

required to ensure the junction temperature is kept below 115°C.

For maximum effectiveness, the PCB area underneath the thermal

pad of the A4403 should be flooded with copper. Several thermal

vias (say between 4 and 8) should be used to connect the thermal

pad to the internal ground plane. If possible, a further thermal

copper plane should be applied to the bottom side of the PCB and

connected to the thermal pad of the A4403 through the vias.

T_A= 70°C,

Target junction temperature, T_J= 115°C,

V_f= 0.55 V, and

C_DIODE= 150 pF, then:

(a) Switch static losses

Maximum duty cycle (equation 19):

This calculation assumes no thermal influence from other compo-

nents. If possible, it is advisable to mount the recirculation diode

(D1) on the reverse side of the printed circuit board. Ensure low

impedance electrical connections are implemented between board

layers.

3.3 + 0.55

D (max) =

= 0.09

42 + 0.55

R_DS(on)of the buck switch (equation 20):

⎛

⎞

PCB Layout Guidelines The ground plane is largely dic-

tated by the thermal requirements of the previous section. The

ground-referenced power components should be referenced to a

star ground, located away from the A4403 to minimize ground

bounce issues.

115 – 25

170

R_DS(on)TJ

= 350 × 10^–3

= 0.535 Ω

⎜

⎟

⎝

⎠

Static loss for each switch (equation 21):

P_STAT= 3²× 0.09 × 0.535 = 0.433 W

(b) Switch dynamic losses (equation 22):

A small, local, relatively quiet ground plane near the A4403

should be used for the ground-referenced support components,

to minimize interference effects of ground noise from the power

circuitry. Figure 4 illustrates the recommended grounding archi-

tecture.

P_DYN42

10^–9× 1000 × 10³×1.6

= 0.504 W

× 5×

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1...9 10 111213 14 15

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与A4403GEU-T相关器件

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A440F002300100	LITTELFUSE	获取价格	GAS DISCHARGE TUBE - 8x10mm
A440F002500100	LITTELFUSE	获取价格	GAS DISCHARGE TUBE - 8x10mm

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