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首页 > 产品中心 > 电源管理 > DC降压型转换器 > Buck降压型芯片 >CXSD6253 380KHz fixed frequency PWM buck (step-down) DC/DC converter capable of driving a 2A load with high efficiency
CXSD6253 380KHz fixed frequency PWM buck (step-down) DC/DC converter capable of driving a 2A load with high efficiency
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CXSD6253 Requiring a minimum number of external components, the regulator is simple to use and include internal frequency compensation and a fixed-frequency oscillator

CXSD6253  380KHz fixed frequency PWM buck (step-down) DC/DC converter capable of driving a 2A load with high efficiency
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产品简介

目录rUe嘉泰姆

1.产品概述       2.产品特点     3.应用范围      4.技术规格书下载(产品PDF文档) rUe嘉泰姆
5.产品封装图   6.电路原理图  7.功能概述      8.相关产品rUe嘉泰姆

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一,产品概述(General Description)      rUe嘉泰姆
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     The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down)rUe嘉泰姆
DC/DC converter,capable of driving a 2A load with high efficiency, low ripplerUe嘉泰姆
and excellent line and load regulation. Requiring a minimum number of external components, the regulator is simple to use and include internal frequency    compensation and a fixed-frequency oscillator.rUe嘉泰姆
    The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An enable function, an over current protection function is built inside. When short protection function happens, the operation frequency will be reduced from 380KHz to 80KHz. An internal compensation block is built in to minimize external component count.rUe嘉泰姆
二.产品特点(Features)rUe嘉泰姆
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Wide 3.6V to 18V Input Voltage RangerUe嘉泰姆
Output Adjustable from 1.222V to 16VrUe嘉泰姆
Maximum Duty Cycle 100%rUe嘉泰姆
Minimum Drop Out 0.6VrUe嘉泰姆
Fixed 380KHz Switching FrequencyrUe嘉泰姆
2A Constant Output Current CapabilityrUe嘉泰姆
Internal Optimize Power MOSFETrUe嘉泰姆
High efficiencyrUe嘉泰姆
Excellent line and load regulationrUe嘉泰姆
TTL shutdown capabilityrUe嘉泰姆
EN pin with hysteresis functionrUe嘉泰姆
Built in thermal shutdown functionrUe嘉泰姆
Built in current limit functionrUe嘉泰姆
Built in output short protection functionrUe嘉泰姆
Available in SOP8L packagerUe嘉泰姆
三,应用范围 (Applications)rUe嘉泰姆
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LCD Monitor and LCD TVrUe嘉泰姆
Digital Photo FramerUe嘉泰姆
Set-up BoxrUe嘉泰姆
ADSL ModemrUe嘉泰姆
Telecom / Networking EquipmentrUe嘉泰姆
四.技术规格书下载(产品PDF)rUe嘉泰姆
rUe嘉泰姆

需要详细的PDF规格书请扫一扫微信联系我们,还可以获得免费样品以及技术支持rUe嘉泰姆

 QQ截图20160419174301.jpgrUe嘉泰姆

五,产品封装图 (Package)rUe嘉泰姆
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blob.pngrUe嘉泰姆

Pin NumberrUe嘉泰姆

Pin NamerUe嘉泰姆

DescriptionrUe嘉泰姆

1,6,8rUe嘉泰姆

NCrUe嘉泰姆

No Connected.rUe嘉泰姆

2rUe嘉泰姆

VINrUe嘉泰姆

Supply Voltage Input Pin. CXSD6253 operates from a 3.6V to 18VrUe嘉泰姆
DC voltage. Bypass Vin to GND with a suitably large capacitorrUe嘉泰姆
to eliminate noise on the input.rUe嘉泰姆

3rUe嘉泰姆

SWrUe嘉泰姆

Power Switch Output Pin (SW). Output is the switch node thatrUe嘉泰姆
supplies power to the output.rUe嘉泰姆

4rUe嘉泰姆

GNDrUe嘉泰姆

Ground Pin. Care must be taken in layout. This pin should berUe嘉泰姆
placed outside of the Schottky Diode to output capacitor groundrUe嘉泰姆
path to prevent switching current spikes from inducing voltagerUe嘉泰姆
noise into CXSD6253.rUe嘉泰姆

5rUe嘉泰姆

FBrUe嘉泰姆

Feedback Pin (FB). Through an external resistor dividerrUe嘉泰姆
network, Feedback senses the output voltage and regulates it.rUe嘉泰姆
The feedback threshold voltage is 1.222V.rUe嘉泰姆

7rUe嘉泰姆

ENrUe嘉泰姆

Enable Pin. Drive EN pin low to turn off the device, drive itrUe嘉泰姆
high to turn it on. Floating is default high.rUe嘉泰姆

六.电路原理图rUe嘉泰姆
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blob.pngrUe嘉泰姆

七,功能概述rUe嘉泰姆
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ParameterrUe嘉泰姆

SymbolrUe嘉泰姆

ValuerUe嘉泰姆

UnitrUe嘉泰姆

Input VoltagerUe嘉泰姆

VinrUe嘉泰姆

-0.3 to 20rUe嘉泰姆

VrUe嘉泰姆

Feedback Pin VoltagerUe嘉泰姆

VFBrUe嘉泰姆

-0.3 to VinrUe嘉泰姆

VrUe嘉泰姆

EN Pin VoltagerUe嘉泰姆

VENrUe嘉泰姆

-0.3 to VinrUe嘉泰姆

VrUe嘉泰姆

Output Switch Pin VoltagerUe嘉泰姆

VOutputrUe嘉泰姆

-0.3 to VinrUe嘉泰姆

VrUe嘉泰姆

Power DissipationrUe嘉泰姆

PDrUe嘉泰姆

Internally limitedrUe嘉泰姆

mWrUe嘉泰姆

Thermal Resistance (SOP8)rUe嘉泰姆
(Junction to Ambient, No Heatsink, Free Air)rUe嘉泰姆

RJArUe嘉泰姆

100rUe嘉泰姆

oC/WrUe嘉泰姆

Operating Junction TemperaturerUe嘉泰姆

TJrUe嘉泰姆

-40 to 125rUe嘉泰姆

oCrUe嘉泰姆

Storage TemperaturerUe嘉泰姆

TSTGrUe嘉泰姆

-65 to 150rUe嘉泰姆

oCrUe嘉泰姆

Lead Temperature (Soldering, 10 sec)rUe嘉泰姆

TLEADrUe嘉泰姆

260rUe嘉泰姆

oCrUe嘉泰姆

ESD (HBM)rUe嘉泰姆

 

2000rUe嘉泰姆

VrUe嘉泰姆

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八.DEMO BOARD MANUALrUe嘉泰姆
         (一)CXSD6253 典型应用测试:   rUe嘉泰姆

参数rUe嘉泰姆

符号rUe嘉泰姆

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单位rUe嘉泰姆

输入电压rUe嘉泰姆

VINrUe嘉泰姆

3.6 to 18rUe嘉泰姆

VrUe嘉泰姆

输出电压rUe嘉泰姆

VOUTrUe嘉泰姆

5rUe嘉泰姆

VrUe嘉泰姆

输出电流rUe嘉泰姆

IOUTrUe嘉泰姆

0 to 2rUe嘉泰姆

ArUe嘉泰姆

1. CXSD6253 12V 转 5V(负载 0.2A—2A)应用电路图:rUe嘉泰姆
blob.pngrUe嘉泰姆

2. CXSD6253 12V 转 5V(负载 0.2A—2A)效率图和输出电压变化曲线:rUe嘉泰姆
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  (二)CXSD6253 PCB 板布局建议:rUe嘉泰姆
(1)流大电流的线要粗,短,不拐弯。rUe嘉泰姆
(2)4 脚(GND),2 脚(VIN)线要粗,短线,不拐弯,且输入电解电容 CIN 和 105 C1 陶rUe嘉泰姆
瓷电容紧挨第 2 脚(VIN)和 4 脚(GND)。(主要是为了减小输入电源布线寄生的电感,电阻rUe嘉泰姆
产生的高压开关毛刺干扰)rUe嘉泰姆
(3)3 脚(SW)输出线要粗,短线,不拐弯,电感和续流二极管要紧挨第 3 脚(SW)输出端。rUe嘉泰姆
(4)5 脚(FB)走线要接到输出滤波电容 C2,COUT 之后, PCB 布线远离 L1,D1,避免噪声干扰。rUe嘉泰姆

CXSD6253PCB 图:rUe嘉泰姆
blob.png(三)CXSD6253 温度测试数据:rUe嘉泰姆
1:CXSD6253 电路图和 PCB 版图。rUe嘉泰姆
blob.pngrUe嘉泰姆

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2:CXSD6253 DEMO 板工作时(12V 转 5V)各元件温度,自然通风,室温:16℃。rUe嘉泰姆

输出负载电流rUe嘉泰姆

0.2ArUe嘉泰姆

0.5ArUe嘉泰姆

1ArUe嘉泰姆

1.5ArUe嘉泰姆

2ArUe嘉泰姆

27℃rUe嘉泰姆

28℃rUe嘉泰姆

31℃rUe嘉泰姆

33℃rUe嘉泰姆

42℃rUe嘉泰姆

 

电感(33uH/2A)rUe嘉泰姆

24℃rUe嘉泰姆

25℃rUe嘉泰姆

28℃rUe嘉泰姆

29℃rUe嘉泰姆

35℃rUe嘉泰姆

肖特基二极管(IN5822)rUe嘉泰姆

22℃rUe嘉泰姆

25℃rUe嘉泰姆

26℃rUe嘉泰姆

30℃rUe嘉泰姆

35℃rUe嘉泰姆

输入电容(35V/220uF)rUe嘉泰姆

22℃rUe嘉泰姆

23℃rUe嘉泰姆

25℃rUe嘉泰姆

26℃rUe嘉泰姆

31℃rUe嘉泰姆

输出电容(35V/220uF)rUe嘉泰姆

22℃rUe嘉泰姆

23℃rUe嘉泰姆

24℃rUe嘉泰姆

26℃rUe嘉泰姆

29℃rUe嘉泰姆

八,相关芯片选择指南rUe嘉泰姆
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降压型直流电源变换器芯片(高效率型)rUe嘉泰姆

产品型号rUe嘉泰姆

输入电压rUe嘉泰姆

开关电流rUe嘉泰姆

开关频率rUe嘉泰姆

电压版本rUe嘉泰姆

封装类型rUe嘉泰姆

CXSD6253rUe嘉泰姆

3.6V ~ 18VrUe嘉泰姆

2ArUe嘉泰姆

380KHzrUe嘉泰姆

Adj   (1.222V)rUe嘉泰姆

SOP8LrUe嘉泰姆

CXSD6254rUe嘉泰姆

3.6V ~ 23VrUe嘉泰姆

3ArUe嘉泰姆

380KHzrUe嘉泰姆

Adj   (1.222V)rUe嘉泰姆

SOP8LrUe嘉泰姆

CXSD6255rUe嘉泰姆

3.6V ~ 18VrUe嘉泰姆

2ArUe嘉泰姆

380KHzrUe嘉泰姆

Adj   (0.8V)rUe嘉泰姆

SOP8LrUe嘉泰姆

CXSD6256rUe嘉泰姆

3.6V ~ 18VrUe嘉泰姆

3ArUe嘉泰姆

380KHzrUe嘉泰姆

Adj   (0.8V)rUe嘉泰姆

SOP8LrUe嘉泰姆

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