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：76

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

目录Pvh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） Pvh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Pvh嘉泰姆

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一,产品概述(General Description) Pvh嘉泰姆
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The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down)Pvh嘉泰姆
DC/DC converter,capable of driving a 2A load with high efficiency, low ripplePvh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.Pvh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.Pvh嘉泰姆
二.产品特点(Features)Pvh嘉泰姆
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Wide 3.6V to 18V Input Voltage RangePvh嘉泰姆
Output Adjustable from 1.222V to 16VPvh嘉泰姆
Maximum Duty Cycle 100%Pvh嘉泰姆
Minimum Drop Out 0.6VPvh嘉泰姆
Fixed 380KHz Switching FrequencyPvh嘉泰姆
2A Constant Output Current CapabilityPvh嘉泰姆
Internal Optimize Power MOSFETPvh嘉泰姆
High efficiencyPvh嘉泰姆
Excellent line and load regulationPvh嘉泰姆
TTL shutdown capabilityPvh嘉泰姆
EN pin with hysteresis functionPvh嘉泰姆
Built in thermal shutdown functionPvh嘉泰姆
Built in current limit functionPvh嘉泰姆
Built in output short protection functionPvh嘉泰姆
Available in SOP8L packagePvh嘉泰姆
三,应用范围 (Applications)Pvh嘉泰姆
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LCD Monitor and LCD TVPvh嘉泰姆
Digital Photo FramePvh嘉泰姆
Set-up BoxPvh嘉泰姆
ADSL ModemPvh嘉泰姆
Telecom / Networking EquipmentPvh嘉泰姆
四.技术规格书下载（产品PDF）Pvh嘉泰姆
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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！Pvh嘉泰姆

QQ截图20160419174301.jpg Pvh嘉泰姆

五,产品封装图 (Package)Pvh嘉泰姆
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Pin NumberPvh嘉泰姆	Pin NamePvh嘉泰姆	DescriptionPvh嘉泰姆
1,6,8Pvh嘉泰姆	NCPvh嘉泰姆	No Connected.Pvh嘉泰姆
2Pvh嘉泰姆	VINPvh嘉泰姆	Supply Voltage Input Pin. CXSD6253 operates from a 3.6V to 18VPvh嘉泰姆 DC voltage. Bypass Vin to GND with a suitably large capacitorPvh嘉泰姆 to eliminate noise on the input.Pvh嘉泰姆
3Pvh嘉泰姆	SWPvh嘉泰姆	Power Switch Output Pin (SW). Output is the switch node thatPvh嘉泰姆 supplies power to the output.Pvh嘉泰姆
4Pvh嘉泰姆	GNDPvh嘉泰姆	Ground Pin. Care must be taken in layout. This pin should bePvh嘉泰姆 placed outside of the Schottky Diode to output capacitor groundPvh嘉泰姆 path to prevent switching current spikes from inducing voltagePvh嘉泰姆 noise into CXSD6253.Pvh嘉泰姆
5Pvh嘉泰姆	FBPvh嘉泰姆	Feedback Pin (FB). Through an external resistor dividerPvh嘉泰姆 network, Feedback senses the output voltage and regulates it.Pvh嘉泰姆 The feedback threshold voltage is 1.222V.Pvh嘉泰姆
7Pvh嘉泰姆	ENPvh嘉泰姆	Enable Pin. Drive EN pin low to turn off the device, drive itPvh嘉泰姆 high to turn it on. Floating is default high.Pvh嘉泰姆

六.电路原理图Pvh嘉泰姆
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七,功能概述Pvh嘉泰姆
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ParameterPvh嘉泰姆	SymbolPvh嘉泰姆	ValuePvh嘉泰姆	UnitPvh嘉泰姆
Input VoltagePvh嘉泰姆	VinPvh嘉泰姆	-0.3 to 20Pvh嘉泰姆	VPvh嘉泰姆
Feedback Pin VoltagePvh嘉泰姆	VFBPvh嘉泰姆	-0.3 to VinPvh嘉泰姆	VPvh嘉泰姆
EN Pin VoltagePvh嘉泰姆	VENPvh嘉泰姆	-0.3 to VinPvh嘉泰姆	VPvh嘉泰姆
Output Switch Pin VoltagePvh嘉泰姆	VOutputPvh嘉泰姆	-0.3 to VinPvh嘉泰姆	VPvh嘉泰姆
Power DissipationPvh嘉泰姆	PDPvh嘉泰姆	Internally limitedPvh嘉泰姆	mWPvh嘉泰姆
Thermal Resistance (SOP8)Pvh嘉泰姆 (Junction to Ambient, No Heatsink, Free Air)Pvh嘉泰姆	RJAPvh嘉泰姆	100Pvh嘉泰姆	oC/WPvh嘉泰姆
Operating Junction TemperaturePvh嘉泰姆	TJPvh嘉泰姆	-40 to 125Pvh嘉泰姆	oCPvh嘉泰姆
Storage TemperaturePvh嘉泰姆	TSTGPvh嘉泰姆	-65 to 150Pvh嘉泰姆	oCPvh嘉泰姆
Lead Temperature (Soldering, 10 sec)Pvh嘉泰姆	TLEADPvh嘉泰姆	260Pvh嘉泰姆	oCPvh嘉泰姆
ESD (HBM)Pvh嘉泰姆		2000Pvh嘉泰姆	VPvh嘉泰姆

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

参数Pvh嘉泰姆	符号Pvh嘉泰姆	值Pvh嘉泰姆	单位Pvh嘉泰姆
输入电压Pvh嘉泰姆	VINPvh嘉泰姆	3.6 to 18Pvh嘉泰姆	VPvh嘉泰姆
输出电压Pvh嘉泰姆	VOUTPvh嘉泰姆	5Pvh嘉泰姆	VPvh嘉泰姆
输出电流Pvh嘉泰姆	IOUTPvh嘉泰姆	0 to 2Pvh嘉泰姆	APvh嘉泰姆

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

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

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

八,相关芯片选择指南Pvh嘉泰姆
Pvh嘉泰姆

降压型直流电源变换器芯片(高效率型)Pvh嘉泰姆
产品型号Pvh嘉泰姆	输入电压Pvh嘉泰姆	开关电流Pvh嘉泰姆	开关频率Pvh嘉泰姆	电压版本Pvh嘉泰姆	封装类型Pvh嘉泰姆
CXSD6253Pvh嘉泰姆	3.6V ~ 18VPvh嘉泰姆	2APvh嘉泰姆	380KHzPvh嘉泰姆	Adj (1.222V)Pvh嘉泰姆	SOP8LPvh嘉泰姆
CXSD6254Pvh嘉泰姆	3.6V ~ 23VPvh嘉泰姆	3APvh嘉泰姆	380KHzPvh嘉泰姆	Adj (1.222V)Pvh嘉泰姆	SOP8LPvh嘉泰姆
CXSD6255Pvh嘉泰姆	3.6V ~ 18VPvh嘉泰姆	2APvh嘉泰姆	380KHzPvh嘉泰姆	Adj (0.8V)Pvh嘉泰姆	SOP8LPvh嘉泰姆
CXSD6256Pvh嘉泰姆	3.6V ~ 18VPvh嘉泰姆	3APvh嘉泰姆	380KHzPvh嘉泰姆	Adj (0.8V)Pvh嘉泰姆	SOP8LPvh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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