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

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发表时间：2020-04-13浏览次数：87

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

目录ypy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） ypy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ypy嘉泰姆

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一,产品概述(General Description) ypy嘉泰姆
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The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down)ypy嘉泰姆
DC/DC converter,capable of driving a 2A load with high efficiency, low rippleypy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.ypy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.ypy嘉泰姆
二.产品特点(Features)ypy嘉泰姆
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Wide 3.6V to 18V Input Voltage Rangeypy嘉泰姆
Output Adjustable from 1.222V to 16Vypy嘉泰姆
Maximum Duty Cycle 100%ypy嘉泰姆
Minimum Drop Out 0.6Vypy嘉泰姆
Fixed 380KHz Switching Frequencyypy嘉泰姆
2A Constant Output Current Capabilityypy嘉泰姆
Internal Optimize Power MOSFETypy嘉泰姆
High efficiencyypy嘉泰姆
Excellent line and load regulationypy嘉泰姆
TTL shutdown capabilityypy嘉泰姆
EN pin with hysteresis functionypy嘉泰姆
Built in thermal shutdown functionypy嘉泰姆
Built in current limit functionypy嘉泰姆
Built in output short protection functionypy嘉泰姆
Available in SOP8L packageypy嘉泰姆
三,应用范围 (Applications)ypy嘉泰姆
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LCD Monitor and LCD TVypy嘉泰姆
Digital Photo Frameypy嘉泰姆
Set-up Boxypy嘉泰姆
ADSL Modemypy嘉泰姆
Telecom / Networking Equipmentypy嘉泰姆
四.技术规格书下载（产品PDF）ypy嘉泰姆
ypy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！ypy嘉泰姆

QQ截图20160419174301.jpg ypy嘉泰姆

五,产品封装图 (Package)ypy嘉泰姆
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Pin Numberypy嘉泰姆	Pin Nameypy嘉泰姆	Descriptionypy嘉泰姆
1,6,8ypy嘉泰姆	NCypy嘉泰姆	No Connected.ypy嘉泰姆
2ypy嘉泰姆	VINypy嘉泰姆	Supply Voltage Input Pin. CXSD6253 operates from a 3.6V to 18Vypy嘉泰姆 DC voltage. Bypass Vin to GND with a suitably large capacitorypy嘉泰姆 to eliminate noise on the input.ypy嘉泰姆
3ypy嘉泰姆	SWypy嘉泰姆	Power Switch Output Pin (SW). Output is the switch node thatypy嘉泰姆 supplies power to the output.ypy嘉泰姆
4ypy嘉泰姆	GNDypy嘉泰姆	Ground Pin. Care must be taken in layout. This pin should beypy嘉泰姆 placed outside of the Schottky Diode to output capacitor groundypy嘉泰姆 path to prevent switching current spikes from inducing voltageypy嘉泰姆 noise into CXSD6253.ypy嘉泰姆
5ypy嘉泰姆	FBypy嘉泰姆	Feedback Pin (FB). Through an external resistor dividerypy嘉泰姆 network, Feedback senses the output voltage and regulates it.ypy嘉泰姆 The feedback threshold voltage is 1.222V.ypy嘉泰姆
7ypy嘉泰姆	ENypy嘉泰姆	Enable Pin. Drive EN pin low to turn off the device, drive itypy嘉泰姆 high to turn it on. Floating is default high.ypy嘉泰姆

六.电路原理图ypy嘉泰姆
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七,功能概述ypy嘉泰姆
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Parameterypy嘉泰姆	Symbolypy嘉泰姆	Valueypy嘉泰姆	Unitypy嘉泰姆
Input Voltageypy嘉泰姆	Vinypy嘉泰姆	-0.3 to 20ypy嘉泰姆	Vypy嘉泰姆
Feedback Pin Voltageypy嘉泰姆	VFBypy嘉泰姆	-0.3 to Vinypy嘉泰姆	Vypy嘉泰姆
EN Pin Voltageypy嘉泰姆	VENypy嘉泰姆	-0.3 to Vinypy嘉泰姆	Vypy嘉泰姆
Output Switch Pin Voltageypy嘉泰姆	VOutputypy嘉泰姆	-0.3 to Vinypy嘉泰姆	Vypy嘉泰姆
Power Dissipationypy嘉泰姆	PDypy嘉泰姆	Internally limitedypy嘉泰姆	mWypy嘉泰姆
Thermal Resistance (SOP8)ypy嘉泰姆 (Junction to Ambient, No Heatsink, Free Air)ypy嘉泰姆	RJAypy嘉泰姆	100ypy嘉泰姆	oC/Wypy嘉泰姆
Operating Junction Temperatureypy嘉泰姆	TJypy嘉泰姆	-40 to 125ypy嘉泰姆	oCypy嘉泰姆
Storage Temperatureypy嘉泰姆	TSTGypy嘉泰姆	-65 to 150ypy嘉泰姆	oCypy嘉泰姆
Lead Temperature (Soldering, 10 sec)ypy嘉泰姆	TLEADypy嘉泰姆	260ypy嘉泰姆	oCypy嘉泰姆
ESD (HBM)ypy嘉泰姆		2000ypy嘉泰姆	Vypy嘉泰姆

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

参数ypy嘉泰姆	符号ypy嘉泰姆	值ypy嘉泰姆	单位ypy嘉泰姆
输入电压ypy嘉泰姆	VINypy嘉泰姆	3.6 to 18ypy嘉泰姆	Vypy嘉泰姆
输出电压ypy嘉泰姆	VOUTypy嘉泰姆	5ypy嘉泰姆	Vypy嘉泰姆
输出电流ypy嘉泰姆	IOUTypy嘉泰姆	0 to 2ypy嘉泰姆	Aypy嘉泰姆

1． CXSD6253 12V 转 5V（负载 0.2A—2A）应用电路图：ypy嘉泰姆
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2. CXSD6253 12V 转 5V（负载 0.2A—2A）效率图和输出电压变化曲线：ypy嘉泰姆
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(二)CXSD6253 PCB 板布局建议：ypy嘉泰姆
（1）流大电流的线要粗，短，不拐弯。ypy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ypy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ypy嘉泰姆
产生的高压开关毛刺干扰）ypy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。ypy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。ypy嘉泰姆

CXSD6253PCB 图：ypy嘉泰姆
(三)CXSD6253 温度测试数据：ypy嘉泰姆
1：CXSD6253 电路图和 PCB 版图。ypy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℃。ypy嘉泰姆

输出负载电流ypy嘉泰姆	0.2Aypy嘉泰姆	0.5Aypy嘉泰姆	1Aypy嘉泰姆	1.5Aypy嘉泰姆	2Aypy嘉泰姆
27℃ypy嘉泰姆	28℃ypy嘉泰姆	31℃ypy嘉泰姆	33℃ypy嘉泰姆	42℃ypy嘉泰姆
电感（33uH/2A）ypy嘉泰姆	24℃ypy嘉泰姆	25℃ypy嘉泰姆	28℃ypy嘉泰姆	29℃ypy嘉泰姆	35℃ypy嘉泰姆
肖特基二极管（IN5822）ypy嘉泰姆	22℃ypy嘉泰姆	25℃ypy嘉泰姆	26℃ypy嘉泰姆	30℃ypy嘉泰姆	35℃ypy嘉泰姆
输入电容（35V/220uF）ypy嘉泰姆	22℃ypy嘉泰姆	23℃ypy嘉泰姆	25℃ypy嘉泰姆	26℃ypy嘉泰姆	31℃ypy嘉泰姆
输出电容（35V/220uF）ypy嘉泰姆	22℃ypy嘉泰姆	23℃ypy嘉泰姆	24℃ypy嘉泰姆	26℃ypy嘉泰姆	29℃ypy嘉泰姆

八,相关芯片选择指南ypy嘉泰姆
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降压型直流电源变换器芯片(高效率型)ypy嘉泰姆
产品型号ypy嘉泰姆	输入电压ypy嘉泰姆	开关电流ypy嘉泰姆	开关频率ypy嘉泰姆	电压版本ypy嘉泰姆	封装类型ypy嘉泰姆
CXSD6253ypy嘉泰姆	3.6V ~ 18Vypy嘉泰姆	2Aypy嘉泰姆	380KHzypy嘉泰姆	Adj (1.222V)ypy嘉泰姆	SOP8Lypy嘉泰姆
CXSD6254ypy嘉泰姆	3.6V ~ 23Vypy嘉泰姆	3Aypy嘉泰姆	380KHzypy嘉泰姆	Adj (1.222V)ypy嘉泰姆	SOP8Lypy嘉泰姆
CXSD6255ypy嘉泰姆	3.6V ~ 18Vypy嘉泰姆	2Aypy嘉泰姆	380KHzypy嘉泰姆	Adj (0.8V)ypy嘉泰姆	SOP8Lypy嘉泰姆
CXSD6256ypy嘉泰姆	3.6V ~ 18Vypy嘉泰姆	3Aypy嘉泰姆	380KHzypy嘉泰姆	Adj (0.8V)ypy嘉泰姆	SOP8Lypy嘉泰姆

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上一篇：CXSD6251 synchronous buck regulator with integrated two 0.13Ω power MOSFETs 2A continuous output current over a wide input supply range

下一篇：CXSD6254 Wide 3.6V to 23V Input Voltage Range PWM buck (step-down) DC/DC converter 3A load Maximum Duty Cycle 100%

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