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首页 > Products > Power Management > DC/DC Step-Down Converter > Buck Step-Down Converter >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

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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Product introduction

目录g9m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) g9m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g9m嘉泰姆

 g9m嘉泰姆

一,产品概述(General Description)      g9m嘉泰姆
g9m嘉泰姆
     The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down)g9m嘉泰姆
DC/DC converter,capable of driving a 2A load with high efficiency, low rippleg9m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.g9m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.g9m嘉泰姆
二.产品特点(Features)g9m嘉泰姆
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Wide 3.6V to 18V Input Voltage Rangeg9m嘉泰姆
Output Adjustable from 1.222V to 16Vg9m嘉泰姆
Maximum Duty Cycle 100%g9m嘉泰姆
Minimum Drop Out 0.6Vg9m嘉泰姆
Fixed 380KHz Switching Frequencyg9m嘉泰姆
2A Constant Output Current Capabilityg9m嘉泰姆
Internal Optimize Power MOSFETg9m嘉泰姆
High efficiencyg9m嘉泰姆
Excellent line and load regulationg9m嘉泰姆
TTL shutdown capabilityg9m嘉泰姆
EN pin with hysteresis functiong9m嘉泰姆
Built in thermal shutdown functiong9m嘉泰姆
Built in current limit functiong9m嘉泰姆
Built in output short protection functiong9m嘉泰姆
Available in SOP8L packageg9m嘉泰姆
三,应用范围 (Applications)g9m嘉泰姆
g9m嘉泰姆
LCD Monitor and LCD TVg9m嘉泰姆
Digital Photo Frameg9m嘉泰姆
Set-up Boxg9m嘉泰姆
ADSL Modemg9m嘉泰姆
Telecom / Networking Equipmentg9m嘉泰姆
四.技术规格书下载(产品PDF)g9m嘉泰姆
g9m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g9m嘉泰姆

 QQ截图20160419174301.jpgg9m嘉泰姆

五,产品封装图 (Package)g9m嘉泰姆
g9m嘉泰姆
blob.pngg9m嘉泰姆

Pin Numberg9m嘉泰姆

Pin Nameg9m嘉泰姆

Descriptiong9m嘉泰姆

1,6,8g9m嘉泰姆

NCg9m嘉泰姆

No Connected.g9m嘉泰姆

2g9m嘉泰姆

VINg9m嘉泰姆

Supply Voltage Input Pin. CXSD6253 operates from a 3.6V to 18Vg9m嘉泰姆
DC voltage. Bypass Vin to GND with a suitably large capacitorg9m嘉泰姆
to eliminate noise on the input.g9m嘉泰姆

3g9m嘉泰姆

SWg9m嘉泰姆

Power Switch Output Pin (SW). Output is the switch node thatg9m嘉泰姆
supplies power to the output.g9m嘉泰姆

4g9m嘉泰姆

GNDg9m嘉泰姆

Ground Pin. Care must be taken in layout. This pin should beg9m嘉泰姆
placed outside of the Schottky Diode to output capacitor groundg9m嘉泰姆
path to prevent switching current spikes from inducing voltageg9m嘉泰姆
noise into CXSD6253.g9m嘉泰姆

5g9m嘉泰姆

FBg9m嘉泰姆

Feedback Pin (FB). Through an external resistor dividerg9m嘉泰姆
network, Feedback senses the output voltage and regulates it.g9m嘉泰姆
The feedback threshold voltage is 1.222V.g9m嘉泰姆

7g9m嘉泰姆

ENg9m嘉泰姆

Enable Pin. Drive EN pin low to turn off the device, drive itg9m嘉泰姆
high to turn it on. Floating is default high.g9m嘉泰姆

六.电路原理图g9m嘉泰姆
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blob.pngg9m嘉泰姆

七,功能概述g9m嘉泰姆
g9m嘉泰姆

Parameterg9m嘉泰姆

Symbolg9m嘉泰姆

Valueg9m嘉泰姆

Unitg9m嘉泰姆

Input Voltageg9m嘉泰姆

Ving9m嘉泰姆

-0.3 to 20g9m嘉泰姆

Vg9m嘉泰姆

Feedback Pin Voltageg9m嘉泰姆

VFBg9m嘉泰姆

-0.3 to Ving9m嘉泰姆

Vg9m嘉泰姆

EN Pin Voltageg9m嘉泰姆

VENg9m嘉泰姆

-0.3 to Ving9m嘉泰姆

Vg9m嘉泰姆

Output Switch Pin Voltageg9m嘉泰姆

VOutputg9m嘉泰姆

-0.3 to Ving9m嘉泰姆

Vg9m嘉泰姆

Power Dissipationg9m嘉泰姆

PDg9m嘉泰姆

Internally limitedg9m嘉泰姆

mWg9m嘉泰姆

Thermal Resistance (SOP8)g9m嘉泰姆
(Junction to Ambient, No Heatsink, Free Air)g9m嘉泰姆

RJAg9m嘉泰姆

100g9m嘉泰姆

oC/Wg9m嘉泰姆

Operating Junction Temperatureg9m嘉泰姆

TJg9m嘉泰姆

-40 to 125g9m嘉泰姆

oCg9m嘉泰姆

Storage Temperatureg9m嘉泰姆

TSTGg9m嘉泰姆

-65 to 150g9m嘉泰姆

oCg9m嘉泰姆

Lead Temperature (Soldering, 10 sec)g9m嘉泰姆

TLEADg9m嘉泰姆

260g9m嘉泰姆

oCg9m嘉泰姆

ESD (HBM)g9m嘉泰姆

 

2000g9m嘉泰姆

Vg9m嘉泰姆

 g9m嘉泰姆

八.DEMO BOARD MANUALg9m嘉泰姆
         (一)CXSD6253 典型应用测试:   g9m嘉泰姆

参数g9m嘉泰姆

符号g9m嘉泰姆

g9m嘉泰姆

单位g9m嘉泰姆

输入电压g9m嘉泰姆

VINg9m嘉泰姆

3.6 to 18g9m嘉泰姆

Vg9m嘉泰姆

输出电压g9m嘉泰姆

VOUTg9m嘉泰姆

5g9m嘉泰姆

Vg9m嘉泰姆

输出电流g9m嘉泰姆

IOUTg9m嘉泰姆

0 to 2g9m嘉泰姆

Ag9m嘉泰姆

1. CXSD6253 12V 转 5V(负载 0.2A—2A)应用电路图:g9m嘉泰姆
blob.pngg9m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:g9m嘉泰姆
g9m嘉泰姆
  (二)CXSD6253 PCB 板布局建议:g9m嘉泰姆
(1)流大电流的线要粗,短,不拐弯。g9m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g9m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g9m嘉泰姆
产生的高压开关毛刺干扰)g9m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。g9m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。g9m嘉泰姆

CXSD6253PCB 图:g9m嘉泰姆
blob.png(三)CXSD6253 温度测试数据:g9m嘉泰姆
1:CXSD6253 电路图和 PCB 版图。g9m嘉泰姆
blob.pngg9m嘉泰姆

blob.pngg9m嘉泰姆

2:CXSD6253 DEMO 板工作时(12V 转 5V)各元件温度,自然通风,室温:16℃。g9m嘉泰姆

输出负载电流g9m嘉泰姆

0.2Ag9m嘉泰姆

0.5Ag9m嘉泰姆

1Ag9m嘉泰姆

1.5Ag9m嘉泰姆

2Ag9m嘉泰姆

27℃g9m嘉泰姆

28℃g9m嘉泰姆

31℃g9m嘉泰姆

33℃g9m嘉泰姆

42℃g9m嘉泰姆

 

电感(33uH/2A)g9m嘉泰姆

24℃g9m嘉泰姆

25℃g9m嘉泰姆

28℃g9m嘉泰姆

29℃g9m嘉泰姆

35℃g9m嘉泰姆

肖特基二极管(IN5822)g9m嘉泰姆

22℃g9m嘉泰姆

25℃g9m嘉泰姆

26℃g9m嘉泰姆

30℃g9m嘉泰姆

35℃g9m嘉泰姆

输入电容(35V/220uF)g9m嘉泰姆

22℃g9m嘉泰姆

23℃g9m嘉泰姆

25℃g9m嘉泰姆

26℃g9m嘉泰姆

31℃g9m嘉泰姆

输出电容(35V/220uF)g9m嘉泰姆

22℃g9m嘉泰姆

23℃g9m嘉泰姆

24℃g9m嘉泰姆

26℃g9m嘉泰姆

29℃g9m嘉泰姆

八,相关芯片选择指南g9m嘉泰姆
g9m嘉泰姆

降压型直流电源变换器芯片(高效率型)g9m嘉泰姆

产品型号g9m嘉泰姆

输入电压g9m嘉泰姆

开关电流g9m嘉泰姆

开关频率g9m嘉泰姆

电压版本g9m嘉泰姆

封装类型g9m嘉泰姆

CXSD6253g9m嘉泰姆

3.6V ~ 18Vg9m嘉泰姆

2Ag9m嘉泰姆

380KHzg9m嘉泰姆

Adj   (1.222V)g9m嘉泰姆

SOP8Lg9m嘉泰姆

CXSD6254g9m嘉泰姆

3.6V ~ 23Vg9m嘉泰姆

3Ag9m嘉泰姆

380KHzg9m嘉泰姆

Adj   (1.222V)g9m嘉泰姆

SOP8Lg9m嘉泰姆

CXSD6255g9m嘉泰姆

3.6V ~ 18Vg9m嘉泰姆

2Ag9m嘉泰姆

380KHzg9m嘉泰姆

Adj   (0.8V)g9m嘉泰姆

SOP8Lg9m嘉泰姆

CXSD6256g9m嘉泰姆

3.6V ~ 18Vg9m嘉泰姆

3Ag9m嘉泰姆

380KHzg9m嘉泰姆

Adj   (0.8V)g9m嘉泰姆

SOP8Lg9m嘉泰姆

g9m嘉泰姆