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A4402ELPTR-T

更新时间： 2024-02-09 22:33:23
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光电二极管
页数 文件大小 规格书
15页 371K
描述
Constant On-Time Buck Converter with Integrated Linear Regulator

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A4402ELPTR-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：TSSOP
包装说明：LEAD FREE, MO-153ABT, TSSOP-16针数：16
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：1.69
Samacsys Confidence：3Samacsys Status：Released
Samacsys PartID：1139186Samacsys Pin Count：17
Samacsys Part Category：Integrated CircuitSamacsys Package Category：Small Outline Packages
Samacsys Footprint Name：Package LP, 16-Pin eTSSOPSamacsys Released Date：2019-01-16 12:18:53
Is Samacsys：N模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：50 V最小输入电压：6 V
标称输入电压：8 VJESD-30 代码：R-PDSO-G16
JESD-609代码：e3长度：5 mm
湿度敏感等级：2功能数量：1
端子数量：16最高工作温度：150 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：HTSSOP封装等效代码：TSSOP16,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.2 mm最大供电电流 (Isup)：6 mA
表面贴装：YES切换器配置：BUCK
最大切换频率：2000 kHz温度等级：AUTOMOTIVE
端子面层：Matte Tin (Sn)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
处于峰值回流温度下的最长时间：40宽度：4.4 mm
Base Number Matches：1

A4402ELPTR-T 数据手册

 浏览型号A4402ELPTR-T的Datasheet PDF文件第5页浏览型号A4402ELPTR-T的Datasheet PDF文件第6页浏览型号A4402ELPTR-T的Datasheet PDF文件第7页浏览型号A4402ELPTR-T的Datasheet PDF文件第9页浏览型号A4402ELPTR-T的Datasheet PDF文件第10页浏览型号A4402ELPTR-T的Datasheet PDF文件第11页 
Constant On-Time Buck Converter  
with Integrated Linear Regulator  
A4402  
Functional Description  
decouple input supply VIN1. The VIN2 input is used to supply  
the linear regulator and should be connected directly to the output  
of the switching regulator.  
Basic Operation The A4402 contains a fixed on-time, adjust-  
able voltage buck switching regulator with valley sensing current  
mode control, and an adjustable linear regulator designed to run  
off the buck regulator output. The constant on-time converter  
maintains a constant output frequency because the on-time is  
inversely proportional to the supply voltage. As the input voltage  
decreases, the on-time is increased, maintaining a relatively con-  
stant period. Valley mode current control allows the converter to  
achieve very short on-times because current is measured during  
the off-time.  
Output Voltage Selection The output voltage on each of the  
two regulators is set by a voltage divider off the regulator output,  
as follows:  
⎛
⎞
R1 + R2  
R2  
⎜
⎜
⎟
⎟
VSW  
VFB1  
=
,
⎝
⎛
⎠
⎞
R1 + R2  
R2  
⎜
⎜
⎟
⎟
VLIN  
VFB2  
(1)  
=
.
The device is enabled via the ENB input. When the ENB pin  
is pulled high, the converter starts-up under the control of an  
adjustable soft start routine whose ramp time is controlled by an  
external capacitor.  
⎝
⎠
In order to maintain accuracy on the regulators the equivalent  
impedance on the FB node (R1 parallel with R2) should be  
approximately 10 kΩ.  
Under light load conditions, the switch enters pulse-skipping  
mode to ensure regulation is maintained. This effectively changes  
the switcher frequency. The frequency also is affected when the  
switcher is operating in discontinuous mode. In order to maintain  
a wide input voltage range, the switcher period is extended when  
Inductor current operating at maximum load  
Current Limit level  
Maximum load  
either the minimum off-time at low V , is reached or the mini-  
IN  
mum on-time at high V .  
IN  
Switcher Overcurrent Protection The converter utilizes  
pulse-by-pulse valley current limiting, which operates when the  
current through the sense resistor creates a voltage on the sense  
pin (ISEN) that equals –0.2 V. During an overload condition, the  
switch is turned on for a period determined by the constant on-  
time circuitry. The switch off-time is extended until the current  
decays to the current limit value set by the selection of the sense  
resistor, at which point the switch turns on again. Because no  
slope compensation is required in this control scheme, the current  
limit is maintained at a reasonably constant level across the input  
voltage range.  
Constant On-Time  
Constant period  
Time  
Inductor current operating in a “soft” overload  
Overload  
Current Limit level  
Constant On-Time  
Figure 1 illustrates how the current is limited during an overload  
condition. The current decay (period with switch off) is propor-  
tional to the output voltage. As the overload is increased, the out-  
put voltage tends to decrease and the switching period increases.  
Extended period  
Time  
VIN1 and VIN2 VIN1 is a high voltage input, designed to with-  
stand 50 V. Bulk capacitance of at least 10 μF should be used to  
Figure 1. Current limiting during overload  
Allegro MicroSystems, Inc.  
115 Northeast Cutoff  
8
Worcester, Massachusetts 01615-0036 U.S.A.  
1.508.853.5000; www.allegromicro.com  
1...567891011...15

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