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：305

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

目录PJ2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） PJ2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PJ2嘉泰姆

PJ2嘉泰姆

一,产品概述(General Description) PJ2嘉泰姆
PJ2嘉泰姆
The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down)PJ2嘉泰姆
DC/DC converter,capable of driving a 2A load with high efficiency, low ripplePJ2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.PJ2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.PJ2嘉泰姆
二.产品特点(Features)PJ2嘉泰姆
PJ2嘉泰姆
Wide 3.6V to 18V Input Voltage RangePJ2嘉泰姆
Output Adjustable from 1.222V to 16VPJ2嘉泰姆
Maximum Duty Cycle 100%PJ2嘉泰姆
Minimum Drop Out 0.6VPJ2嘉泰姆
Fixed 380KHz Switching FrequencyPJ2嘉泰姆
2A Constant Output Current CapabilityPJ2嘉泰姆
Internal Optimize Power MOSFETPJ2嘉泰姆
High efficiencyPJ2嘉泰姆
Excellent line and load regulationPJ2嘉泰姆
TTL shutdown capabilityPJ2嘉泰姆
EN pin with hysteresis functionPJ2嘉泰姆
Built in thermal shutdown functionPJ2嘉泰姆
Built in current limit functionPJ2嘉泰姆
Built in output short protection functionPJ2嘉泰姆
Available in SOP8L packagePJ2嘉泰姆
三,应用范围 (Applications)PJ2嘉泰姆
PJ2嘉泰姆
LCD Monitor and LCD TVPJ2嘉泰姆
Digital Photo FramePJ2嘉泰姆
Set-up BoxPJ2嘉泰姆
ADSL ModemPJ2嘉泰姆
Telecom / Networking EquipmentPJ2嘉泰姆
四.技术规格书下载（产品PDF）PJ2嘉泰姆
PJ2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！PJ2嘉泰姆

QQ截图20160419174301.jpg PJ2嘉泰姆

五,产品封装图 (Package)PJ2嘉泰姆
PJ2嘉泰姆
PJ2嘉泰姆

Pin NumberPJ2嘉泰姆	Pin NamePJ2嘉泰姆	DescriptionPJ2嘉泰姆
1,6,8PJ2嘉泰姆	NCPJ2嘉泰姆	No Connected.PJ2嘉泰姆
2PJ2嘉泰姆	VINPJ2嘉泰姆	Supply Voltage Input Pin. CXSD6253 operates from a 3.6V to 18VPJ2嘉泰姆 DC voltage. Bypass Vin to GND with a suitably large capacitorPJ2嘉泰姆 to eliminate noise on the input.PJ2嘉泰姆
3PJ2嘉泰姆	SWPJ2嘉泰姆	Power Switch Output Pin (SW). Output is the switch node thatPJ2嘉泰姆 supplies power to the output.PJ2嘉泰姆
4PJ2嘉泰姆	GNDPJ2嘉泰姆	Ground Pin. Care must be taken in layout. This pin should bePJ2嘉泰姆 placed outside of the Schottky Diode to output capacitor groundPJ2嘉泰姆 path to prevent switching current spikes from inducing voltagePJ2嘉泰姆 noise into CXSD6253.PJ2嘉泰姆
5PJ2嘉泰姆	FBPJ2嘉泰姆	Feedback Pin (FB). Through an external resistor dividerPJ2嘉泰姆 network, Feedback senses the output voltage and regulates it.PJ2嘉泰姆 The feedback threshold voltage is 1.222V.PJ2嘉泰姆
7PJ2嘉泰姆	ENPJ2嘉泰姆	Enable Pin. Drive EN pin low to turn off the device, drive itPJ2嘉泰姆 high to turn it on. Floating is default high.PJ2嘉泰姆

六.电路原理图PJ2嘉泰姆
PJ2嘉泰姆
PJ2嘉泰姆

七,功能概述PJ2嘉泰姆
PJ2嘉泰姆

ParameterPJ2嘉泰姆	SymbolPJ2嘉泰姆	ValuePJ2嘉泰姆	UnitPJ2嘉泰姆
Input VoltagePJ2嘉泰姆	VinPJ2嘉泰姆	-0.3 to 20PJ2嘉泰姆	VPJ2嘉泰姆
Feedback Pin VoltagePJ2嘉泰姆	VFBPJ2嘉泰姆	-0.3 to VinPJ2嘉泰姆	VPJ2嘉泰姆
EN Pin VoltagePJ2嘉泰姆	VENPJ2嘉泰姆	-0.3 to VinPJ2嘉泰姆	VPJ2嘉泰姆
Output Switch Pin VoltagePJ2嘉泰姆	VOutputPJ2嘉泰姆	-0.3 to VinPJ2嘉泰姆	VPJ2嘉泰姆
Power DissipationPJ2嘉泰姆	PDPJ2嘉泰姆	Internally limitedPJ2嘉泰姆	mWPJ2嘉泰姆
Thermal Resistance (SOP8)PJ2嘉泰姆 (Junction to Ambient, No Heatsink, Free Air)PJ2嘉泰姆	RJAPJ2嘉泰姆	100PJ2嘉泰姆	oC/WPJ2嘉泰姆
Operating Junction TemperaturePJ2嘉泰姆	TJPJ2嘉泰姆	-40 to 125PJ2嘉泰姆	oCPJ2嘉泰姆
Storage TemperaturePJ2嘉泰姆	TSTGPJ2嘉泰姆	-65 to 150PJ2嘉泰姆	oCPJ2嘉泰姆
Lead Temperature (Soldering, 10 sec)PJ2嘉泰姆	TLEADPJ2嘉泰姆	260PJ2嘉泰姆	oCPJ2嘉泰姆
ESD (HBM)PJ2嘉泰姆		2000PJ2嘉泰姆	VPJ2嘉泰姆

PJ2嘉泰姆

八.DEMO BOARD MANUALPJ2嘉泰姆
(一)CXSD6253 典型应用测试： PJ2嘉泰姆

参数PJ2嘉泰姆	符号PJ2嘉泰姆	值PJ2嘉泰姆	单位PJ2嘉泰姆
输入电压PJ2嘉泰姆	VINPJ2嘉泰姆	3.6 to 18PJ2嘉泰姆	VPJ2嘉泰姆
输出电压PJ2嘉泰姆	VOUTPJ2嘉泰姆	5PJ2嘉泰姆	VPJ2嘉泰姆
输出电流PJ2嘉泰姆	IOUTPJ2嘉泰姆	0 to 2PJ2嘉泰姆	APJ2嘉泰姆

1． CXSD6253 12V 转 5V（负载 0.2A—2A）应用电路图：PJ2嘉泰姆
PJ2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：PJ2嘉泰姆
PJ2嘉泰姆
(二)CXSD6253 PCB 板布局建议：PJ2嘉泰姆
（1）流大电流的线要粗，短，不拐弯。PJ2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PJ2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PJ2嘉泰姆
产生的高压开关毛刺干扰）PJ2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。PJ2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。PJ2嘉泰姆

CXSD6253PCB 图：PJ2嘉泰姆
(三)CXSD6253 温度测试数据：PJ2嘉泰姆
1：CXSD6253 电路图和 PCB 版图。PJ2嘉泰姆
PJ2嘉泰姆

PJ2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℃。PJ2嘉泰姆

输出负载电流PJ2嘉泰姆	0.2APJ2嘉泰姆	0.5APJ2嘉泰姆	1APJ2嘉泰姆	1.5APJ2嘉泰姆	2APJ2嘉泰姆
27℃PJ2嘉泰姆	28℃PJ2嘉泰姆	31℃PJ2嘉泰姆	33℃PJ2嘉泰姆	42℃PJ2嘉泰姆
电感（33uH/2A）PJ2嘉泰姆	24℃PJ2嘉泰姆	25℃PJ2嘉泰姆	28℃PJ2嘉泰姆	29℃PJ2嘉泰姆	35℃PJ2嘉泰姆
肖特基二极管（IN5822）PJ2嘉泰姆	22℃PJ2嘉泰姆	25℃PJ2嘉泰姆	26℃PJ2嘉泰姆	30℃PJ2嘉泰姆	35℃PJ2嘉泰姆
输入电容（35V/220uF）PJ2嘉泰姆	22℃PJ2嘉泰姆	23℃PJ2嘉泰姆	25℃PJ2嘉泰姆	26℃PJ2嘉泰姆	31℃PJ2嘉泰姆
输出电容（35V/220uF）PJ2嘉泰姆	22℃PJ2嘉泰姆	23℃PJ2嘉泰姆	24℃PJ2嘉泰姆	26℃PJ2嘉泰姆	29℃PJ2嘉泰姆

八,相关芯片选择指南PJ2嘉泰姆
PJ2嘉泰姆

降压型直流电源变换器芯片(高效率型)PJ2嘉泰姆
产品型号PJ2嘉泰姆	输入电压PJ2嘉泰姆	开关电流PJ2嘉泰姆	开关频率PJ2嘉泰姆	电压版本PJ2嘉泰姆	封装类型PJ2嘉泰姆
CXSD6253PJ2嘉泰姆	3.6V ~ 18VPJ2嘉泰姆	2APJ2嘉泰姆	380KHzPJ2嘉泰姆	Adj (1.222V)PJ2嘉泰姆	SOP8LPJ2嘉泰姆
CXSD6254PJ2嘉泰姆	3.6V ~ 23VPJ2嘉泰姆	3APJ2嘉泰姆	380KHzPJ2嘉泰姆	Adj (1.222V)PJ2嘉泰姆	SOP8LPJ2嘉泰姆
CXSD6255PJ2嘉泰姆	3.6V ~ 18VPJ2嘉泰姆	2APJ2嘉泰姆	380KHzPJ2嘉泰姆	Adj (0.8V)PJ2嘉泰姆	SOP8LPJ2嘉泰姆
CXSD6256PJ2嘉泰姆	3.6V ~ 18VPJ2嘉泰姆	3APJ2嘉泰姆	380KHzPJ2嘉泰姆	Adj (0.8V)PJ2嘉泰姆	SOP8LPJ2嘉泰姆

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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