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A4403GEU-T

更新时间： 2024-02-13 12:30:05

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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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

Then, the minimum on-time is:

Top-Off Charge Pump During light load operation, when

operating in PFM mode, the top-off charge pump provides

enough charge to drive the buck switch.

⎛

⎞

5 + 0.5

46 + 0.5

⎜

⎟

118 ns

T (min)

1× 10⁶

⎝

⎠

Light Load Operation To avoid the output voltage peak charg-

ing due to leakage effects from the buck switch and the charge

pump recirculation current, a minimum load of 1 mA must be

applied to the output.

The specified minimum on-time, T_on(min), is 60 ns maximum, so

there is reasonable margin in this case.

The specified minimum off-time, T_off(min), 350 ns maximum,

also has to be considered. The minimum off-time occurs at

minimum input voltage and maximum load. As was shown in the

minimum on-time calculation (equation 4), you have to exam-

ine the extreme operating conditions to ensure adequate margin

exists.

The output feedback resistor network provides some loading.

Depending on the values selected, this network may provide all,

or at least some, of the minimum loading requirement.

Control Loop The process of closing the control loop for the

A4403 has been greatly simplified through the integration of

the compensation components into the device. The control loop

bandwidth has been optimized for operation across the full input

and output voltage range and for switching frequencies between

450 kHz and 2 MHz. Loop optimization is achieved with a 20 ꢀF

ceramic capacitor placed across the output (VOUT to GND) and

a power inductor that achieves a peak to peak ripple current of

around 720 mA. For example, for a 3.3 V output operating at a

frequency of 1 MHz, the power inductor = 4.7 ꢀH.

The switch on-time, T_on, is set by the current flowing into the

TON pin. The current is determined by the input voltage, V_IN,

and the resistor R1. The on-time can be found as:

⎛

⎞

R₁

–9

⎜

⎟

T_on

+ 10×10

(5)

V_IN× 2.05×10¹⁰

⎝

⎠

The switching frequency may be slightly modulated by load

changes. The on-time is always constant for a given input voltage

and across the load range. To compensate for any losses in the

circuitry (for example, in the series switch and inductor, or in the

voltage drop across the recirculation diode), the off-time, hence

the switching frequency, has to be adjusted. This effect is most

noticeable at low input voltages and high output currents.

Larger output capacitors can be used; however, this tends to

decrease the bandwidth of the control loop. Note that the output

capacitance should not exceed 1000 ꢀF or be less than 10 ꢀF, as

this may cause a loop instability to occur.

2000

1800

To calculate the actual switching frequency, the T_onof equa-

tion 5 can be used in conjunction with the transfer function of the

converter:

V_OUT

1600

⎛

⎞

V_OUT+ V_f

V_IN+ V_f

1400

1200

1000

⎜

⎟

f_SW

(6)

T_on

⎝

⎠

An alternative approach to selecting the TON resistor (R1), to

0.8 V

1.5 V

3.3 V

5 V

12 V

accomplish an approximate switching frequency is found in the

following formula:

800

600

400

V_OUT× 2.05× 10¹⁰

R₁

(7)

100

Resistor R1 (kΩ)

1000

f_SW

Figure 2 illustrates a range of switching frequencies that can be

achieved with various TON resistances and output voltages.

Figure 2. Switching frequencies versus TON resistor values, at various

levels of V_OUT

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

1...4 5 678 9 10...15

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与A4403GEU-T相关器件

型号	品牌	描述	获取价格	数据表
A4403GEUTR-T	ALLEGRO	Valley Current Mode Control Buck Converter	获取价格
A4405	ALLEGRO	The A4405 is an automotive power management IC that uses a high frequency constant on-time	获取价格
A4406	ALLEGRO	The A4406 is an automotive power management IC that uses a high frequency constant on-time	获取价格
A4407	ALLEGRO	The A4407 is an automotive power management IC that uses a 2.2 MHz constant on-time (COT)	获取价格
A4408	ALLEGRO	PWM frequency can be synchronized to external clock	获取价格
A4408KLVTR-T	ALLEGRO	PWM frequency can be synchronized to external clock	获取价格

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