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

Time of publication：2020-04-13Number of views：38

目录mPu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） mPu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mPu嘉泰姆

mPu嘉泰姆

一,产品概述(General Description) mPu嘉泰姆
mPu嘉泰姆
The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down)mPu嘉泰姆
DC/DC converter,capable of driving a 2A load with high efficiency, low ripplemPu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.mPu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.mPu嘉泰姆
二.产品特点(Features)mPu嘉泰姆
mPu嘉泰姆
Wide 3.6V to 18V Input Voltage RangemPu嘉泰姆
Output Adjustable from 1.222V to 16VmPu嘉泰姆
Maximum Duty Cycle 100%mPu嘉泰姆
Minimum Drop Out 0.6VmPu嘉泰姆
Fixed 380KHz Switching FrequencymPu嘉泰姆
2A Constant Output Current CapabilitymPu嘉泰姆
Internal Optimize Power MOSFETmPu嘉泰姆
High efficiencymPu嘉泰姆
Excellent line and load regulationmPu嘉泰姆
TTL shutdown capabilitymPu嘉泰姆
EN pin with hysteresis functionmPu嘉泰姆
Built in thermal shutdown functionmPu嘉泰姆
Built in current limit functionmPu嘉泰姆
Built in output short protection functionmPu嘉泰姆
Available in SOP8L packagemPu嘉泰姆
三,应用范围 (Applications)mPu嘉泰姆
mPu嘉泰姆
LCD Monitor and LCD TVmPu嘉泰姆
Digital Photo FramemPu嘉泰姆
Set-up BoxmPu嘉泰姆
ADSL ModemmPu嘉泰姆
Telecom / Networking EquipmentmPu嘉泰姆
四.技术规格书下载（产品PDF）mPu嘉泰姆
mPu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！mPu嘉泰姆

QQ截图20160419174301.jpg mPu嘉泰姆

五,产品封装图 (Package)mPu嘉泰姆
mPu嘉泰姆
mPu嘉泰姆

Pin NumbermPu嘉泰姆	Pin NamemPu嘉泰姆	DescriptionmPu嘉泰姆
1,6,8mPu嘉泰姆	NCmPu嘉泰姆	No Connected.mPu嘉泰姆
2mPu嘉泰姆	VINmPu嘉泰姆	Supply Voltage Input Pin. CXSD6253 operates from a 3.6V to 18VmPu嘉泰姆 DC voltage. Bypass Vin to GND with a suitably large capacitormPu嘉泰姆 to eliminate noise on the input.mPu嘉泰姆
3mPu嘉泰姆	SWmPu嘉泰姆	Power Switch Output Pin (SW). Output is the switch node thatmPu嘉泰姆 supplies power to the output.mPu嘉泰姆
4mPu嘉泰姆	GNDmPu嘉泰姆	Ground Pin. Care must be taken in layout. This pin should bemPu嘉泰姆 placed outside of the Schottky Diode to output capacitor groundmPu嘉泰姆 path to prevent switching current spikes from inducing voltagemPu嘉泰姆 noise into CXSD6253.mPu嘉泰姆
5mPu嘉泰姆	FBmPu嘉泰姆	Feedback Pin (FB). Through an external resistor dividermPu嘉泰姆 network, Feedback senses the output voltage and regulates it.mPu嘉泰姆 The feedback threshold voltage is 1.222V.mPu嘉泰姆
7mPu嘉泰姆	ENmPu嘉泰姆	Enable Pin. Drive EN pin low to turn off the device, drive itmPu嘉泰姆 high to turn it on. Floating is default high.mPu嘉泰姆

六.电路原理图mPu嘉泰姆
mPu嘉泰姆
mPu嘉泰姆

七,功能概述mPu嘉泰姆
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ParametermPu嘉泰姆	SymbolmPu嘉泰姆	ValuemPu嘉泰姆	UnitmPu嘉泰姆
Input VoltagemPu嘉泰姆	VinmPu嘉泰姆	-0.3 to 20mPu嘉泰姆	VmPu嘉泰姆
Feedback Pin VoltagemPu嘉泰姆	VFBmPu嘉泰姆	-0.3 to VinmPu嘉泰姆	VmPu嘉泰姆
EN Pin VoltagemPu嘉泰姆	VENmPu嘉泰姆	-0.3 to VinmPu嘉泰姆	VmPu嘉泰姆
Output Switch Pin VoltagemPu嘉泰姆	VOutputmPu嘉泰姆	-0.3 to VinmPu嘉泰姆	VmPu嘉泰姆
Power DissipationmPu嘉泰姆	PDmPu嘉泰姆	Internally limitedmPu嘉泰姆	mWmPu嘉泰姆
Thermal Resistance (SOP8)mPu嘉泰姆 (Junction to Ambient, No Heatsink, Free Air)mPu嘉泰姆	RJAmPu嘉泰姆	100mPu嘉泰姆	oC/WmPu嘉泰姆
Operating Junction TemperaturemPu嘉泰姆	TJmPu嘉泰姆	-40 to 125mPu嘉泰姆	oCmPu嘉泰姆
Storage TemperaturemPu嘉泰姆	TSTGmPu嘉泰姆	-65 to 150mPu嘉泰姆	oCmPu嘉泰姆
Lead Temperature (Soldering, 10 sec)mPu嘉泰姆	TLEADmPu嘉泰姆	260mPu嘉泰姆	oCmPu嘉泰姆
ESD (HBM)mPu嘉泰姆		2000mPu嘉泰姆	VmPu嘉泰姆

mPu嘉泰姆

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

参数mPu嘉泰姆	符号mPu嘉泰姆	值mPu嘉泰姆	单位mPu嘉泰姆
输入电压mPu嘉泰姆	VINmPu嘉泰姆	3.6 to 18mPu嘉泰姆	VmPu嘉泰姆
输出电压mPu嘉泰姆	VOUTmPu嘉泰姆	5mPu嘉泰姆	VmPu嘉泰姆
输出电流mPu嘉泰姆	IOUTmPu嘉泰姆	0 to 2mPu嘉泰姆	AmPu嘉泰姆

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

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

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

八,相关芯片选择指南mPu嘉泰姆
mPu嘉泰姆

降压型直流电源变换器芯片(高效率型)mPu嘉泰姆
产品型号mPu嘉泰姆	输入电压mPu嘉泰姆	开关电流mPu嘉泰姆	开关频率mPu嘉泰姆	电压版本mPu嘉泰姆	封装类型mPu嘉泰姆
CXSD6253mPu嘉泰姆	3.6V ~ 18VmPu嘉泰姆	2AmPu嘉泰姆	380KHzmPu嘉泰姆	Adj (1.222V)mPu嘉泰姆	SOP8LmPu嘉泰姆
CXSD6254mPu嘉泰姆	3.6V ~ 23VmPu嘉泰姆	3AmPu嘉泰姆	380KHzmPu嘉泰姆	Adj (1.222V)mPu嘉泰姆	SOP8LmPu嘉泰姆
CXSD6255mPu嘉泰姆	3.6V ~ 18VmPu嘉泰姆	2AmPu嘉泰姆	380KHzmPu嘉泰姆	Adj (0.8V)mPu嘉泰姆	SOP8LmPu嘉泰姆
CXSD6256mPu嘉泰姆	3.6V ~ 18VmPu嘉泰姆	3AmPu嘉泰姆	380KHzmPu嘉泰姆	Adj (0.8V)mPu嘉泰姆	SOP8LmPu嘉泰姆

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