The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down) DC/DC converter,capable of driving a 2A load with high efficiency, low ripple and excellent line and load regulation.

发布时间：2020-04-06 09:43:38 浏览次数：706 作者：嘉泰姆来源：1

摘要：The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down) DC/DC converter,capable of driving a 2A load with high efficiency, low ripple and excellent line and load regulation.

目录jR1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） 
5.功能概述 8.相关产品jR1嘉泰姆

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一,产品概述(General Description)

The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down)
DC/DC converter,capable of driving a 2A load with high efficiency, low ripple
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.
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.
二.产品特点(Features)

Wide 3.6V to 18V Input Voltage Range
Output Adjustable from 1.222V to 16V
Maximum Duty Cycle 100%
Minimum Drop Out 0.6V
Fixed 380KHz Switching Frequency
2A Constant Output Current Capability
Internal Optimize Power MOSFET
High efficiency
Excellent line and load regulation
TTL shutdown capability
EN pin with hysteresis function
Built in thermal shutdown function
Built in current limit function
Built in output short protection function
Available in SOP8L package
三,应用范围 (Applications)

LCD Monitor and LCD TV
Digital Photo Frame
Set-up Box
ADSL Modem
Telecom / Networking Equipment
四.技术规格书下载（产品PDF）

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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！jR1嘉泰姆

QQ截图20160419174301.jpg jR1嘉泰姆

五,产品封装图 (Package)

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Pin NumberjR1嘉泰姆	Pin NamejR1嘉泰姆	DescriptionjR1嘉泰姆
1,6,8jR1嘉泰姆	NCjR1嘉泰姆	No Connected.jR1嘉泰姆
2jR1嘉泰姆	VINjR1嘉泰姆	Supply Voltage Input Pin. CXSD6253 operates from a 3.6V to 18V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.jR1嘉泰姆
3jR1嘉泰姆	SWjR1嘉泰姆	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.jR1嘉泰姆
4jR1嘉泰姆	GNDjR1嘉泰姆	Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into CXSD6253.jR1嘉泰姆
5jR1嘉泰姆	FBjR1嘉泰姆	Feedback Pin (FB). Through an external resistor divider network, Feedback senses the output voltage and regulates it. The feedback threshold voltage is 1.222V.jR1嘉泰姆
7jR1嘉泰姆	ENjR1嘉泰姆	Enable Pin. Drive EN pin low to turn off the device, drive it high to turn it on. Floating is default high.jR1嘉泰姆

六.电路原理图

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七,功能概述

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ParameterjR1嘉泰姆	SymboljR1嘉泰姆	ValuejR1嘉泰姆	UnitjR1嘉泰姆
Input VoltagejR1嘉泰姆	VinjR1嘉泰姆	-0.3 to 20jR1嘉泰姆	VjR1嘉泰姆
Feedback Pin VoltagejR1嘉泰姆	VFBjR1嘉泰姆	-0.3 to VinjR1嘉泰姆	VjR1嘉泰姆
EN Pin VoltagejR1嘉泰姆	VENjR1嘉泰姆	-0.3 to VinjR1嘉泰姆	VjR1嘉泰姆
Output Switch Pin VoltagejR1嘉泰姆	VOutputjR1嘉泰姆	-0.3 to VinjR1嘉泰姆	VjR1嘉泰姆
Power DissipationjR1嘉泰姆	PDjR1嘉泰姆	Internally limitedjR1嘉泰姆	mWjR1嘉泰姆
Thermal Resistance (SOP8) (Junction to Ambient, No Heatsink, Free Air)jR1嘉泰姆	RJAjR1嘉泰姆	100jR1嘉泰姆	oC/WjR1嘉泰姆
Operating Junction TemperaturejR1嘉泰姆	TJjR1嘉泰姆	-40 to 125jR1嘉泰姆	oCjR1嘉泰姆
Storage TemperaturejR1嘉泰姆	TSTGjR1嘉泰姆	-65 to 150jR1嘉泰姆	oCjR1嘉泰姆
Lead Temperature (Soldering, 10 sec)jR1嘉泰姆	TLEADjR1嘉泰姆	260jR1嘉泰姆	oCjR1嘉泰姆
ESD (HBM)jR1嘉泰姆		2000jR1嘉泰姆	VjR1嘉泰姆

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八.DEMO BOARD MANUAL
(一)CXSD6253 典型应用测试：  jR1嘉泰姆

参数jR1嘉泰姆	符号jR1嘉泰姆	值</span>jR1嘉泰姆	单位jR1嘉泰姆
输入电压jR1嘉泰姆	VINjR1嘉泰姆	3.6 to 18jR1嘉泰姆	VjR1嘉泰姆
输出电压jR1嘉泰姆	VOUTjR1嘉泰姆	5jR1嘉泰姆	VjR1嘉泰姆
输出电流jR1嘉泰姆	IOUTjR1嘉泰姆	0 to 2jR1嘉泰姆	AjR1嘉泰姆

1． CXSD6253 12V 转 5V（负载 0.2A—2A）应用电路图： jR1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：

(二)CXSD6253 PCB 板布局建议：
（1）流大电流的线要粗，短，不拐弯。
（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
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
产生的高压开关毛刺干扰）
（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。
（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。jR1嘉泰姆

CXSD6253PCB 图：
(三)CXSD6253 温度测试数据：
1：CXSD6253 电路图和 PCB 版图。
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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℃。jR1嘉泰姆

输出负载电流jR1嘉泰姆	0.2AjR1嘉泰姆	0.5AjR1嘉泰姆	1AjR1嘉泰姆	1.5AjR1嘉泰姆	2AjR1嘉泰姆
27℃</span>jR1嘉泰姆	28℃</span>jR1嘉泰姆	31℃</span>jR1嘉泰姆	33℃</span>jR1嘉泰姆	42℃</span>jR1嘉泰姆
电感（33uH/2A）</span>jR1嘉泰姆	24℃</span>jR1嘉泰姆	25℃</span>jR1嘉泰姆	28℃</span>jR1嘉泰姆	29℃</span>jR1嘉泰姆	35℃</span>jR1嘉泰姆
肖特基二极管（IN5822）</span>jR1嘉泰姆	22℃</span>jR1嘉泰姆	25℃</span>jR1嘉泰姆	26℃</span>jR1嘉泰姆	30℃</span>jR1嘉泰姆	35℃</span>jR1嘉泰姆
输入电容（35V/220uF）</span>jR1嘉泰姆	22℃</span>jR1嘉泰姆	23℃</span>jR1嘉泰姆	25℃</span>jR1嘉泰姆	26℃</span>jR1嘉泰姆	31℃</span>jR1嘉泰姆
输出电容（35V/220uF）</span>jR1嘉泰姆	22℃</span>jR1嘉泰姆	23℃</span>jR1嘉泰姆	24℃</span>jR1嘉泰姆	26℃</span>jR1嘉泰姆	29℃</span>jR1嘉泰姆

八,相关芯片选择指南

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降压型直流电源变换器芯片(高效率型)jR1嘉泰姆
产品型号jR1嘉泰姆	输入电压jR1嘉泰姆	开关电流</span>jR1嘉泰姆	开关频率</span>jR1嘉泰姆	电压版本jR1嘉泰姆	封装类型jR1嘉泰姆
CXSD6253jR1嘉泰姆	3.6V ~ 18VjR1嘉泰姆	2AjR1嘉泰姆	380KHzjR1嘉泰姆	Adj (1.222V)jR1嘉泰姆	SOP8LjR1嘉泰姆
CXSD6254jR1嘉泰姆	3.6V ~ 23VjR1嘉泰姆	3AjR1嘉泰姆	380KHzjR1嘉泰姆	Adj (1.222V)jR1嘉泰姆	SOP8LjR1嘉泰姆
CXSD6255jR1嘉泰姆	3.6V ~ 18VjR1嘉泰姆	2AjR1嘉泰姆	380KHzjR1嘉泰姆	Adj (0.8V)jR1嘉泰姆	SOP8LjR1嘉泰姆
CXSD6256jR1嘉泰姆	3.6V ~ 18VjR1嘉泰姆	3AjR1嘉泰姆	380KHzjR1嘉泰姆	Adj (0.8V)jR1嘉泰姆	SOP8LjR1嘉泰姆

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The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down) DC/DC converter,capable of driving a 2A load with high efficiency, low ripple and excellent line and load regulation.

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The CXSD6253 is a 380KHz fixed frequency PWM buck (step-down) DC/DC converter,capable of driving a 2A load with high efficiency, low ripple and excellent line and load regulation.

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