CXSD6257 300KHz fixed frequency PWM buck (step-down) DC/DC converter 4A load with high efficiency Wide 5V to 32V Input Voltage Range

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发表时间：2020-04-13浏览次数：101

CXSD6257 300KHz fixed frequency PWM buck (step-down) DC/DC converter 4A load with high efficiency Wide 5V to 32V Input Voltage Range

目录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） dJV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dJV嘉泰姆
一,产品概述(General Description)      dJV嘉泰姆
dJV嘉泰姆
  The CXSD6257 is a 300KHz fixed frequency PWM buck (step-down)dJV嘉泰姆
DC/DC converter,capable of driving a 4A load with high efficiency, lowdJV嘉泰姆
ripple and excellent line and load regulation.Requiring a minimum numberdJV嘉泰姆
of external components, the regulator is simple to use and include internal dJV嘉泰姆
frequency compensation and a fixed-frequency oscillator. dJV嘉泰姆
The PWM control circuit is able to adjust the duty ratio linearly from 0 todJV嘉泰姆
100%. An enable function, an over current protection function is built inside.dJV嘉泰姆
When short protection function happens, the operation frequency will bedJV嘉泰姆
reduced from 300KHz to 60KHz. An internal compensation block is built in to minimize external component count.dJV嘉泰姆
二.产品特点(Features)dJV嘉泰姆
dJV嘉泰姆
Wide 5V to 32V Input Voltage RangedJV嘉泰姆
Output Adjustable from 0.8V to 30VdJV嘉泰姆
Maximum Duty Cycle 100%dJV嘉泰姆
Minimum Drop Out 0.6VdJV嘉泰姆
Fixed 300KHz Switching FrequencydJV嘉泰姆
4A Constant Output Current CapabilitydJV嘉泰姆
Internal Optimize Power MOSFETdJV嘉泰姆
High efficiencydJV嘉泰姆
Excellent line and load regulationdJV嘉泰姆
TTL shutdown capabilitydJV嘉泰姆
EN pin with hysteresis functiondJV嘉泰姆
Built in thermal shutdown functiondJV嘉泰姆
Built in current limit functiondJV嘉泰姆
Built in output short protection functiondJV嘉泰姆
Available in TO-252 packagedJV嘉泰姆
三,应用范围 (Applications)dJV嘉泰姆
dJV嘉泰姆

LCD Monitor and LCD TVdJV嘉泰姆
Digital Photo FramedJV嘉泰姆
Set-up BoxdJV嘉泰姆
ADSL ModemdJV嘉泰姆
Telecom / Networking EquipmentdJV嘉泰姆

四.技术规格书下载（产品PDF）dJV嘉泰姆
dJV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！dJV嘉泰姆

QQ截图20160419174301.jpg dJV嘉泰姆

五,产品封装图 (Package)dJV嘉泰姆
dJV嘉泰姆
dJV嘉泰姆

Pin NumberdJV嘉泰姆	Pin NamedJV嘉泰姆	DescriptiondJV嘉泰姆
1dJV嘉泰姆	GNDdJV嘉泰姆	Ground Pin. Care must be taken in layout. This pin should bedJV嘉泰姆 placed outside of the Schottky Diode to output capacitordJV嘉泰姆 ground path to prevent switching current spikes from inducingdJV嘉泰姆 voltage noise into CXSD6257.dJV嘉泰姆
2dJV嘉泰姆	FBdJV嘉泰姆	Feedback Pin (FB). Through an external resistor dividerdJV嘉泰姆 network, FB senses the output voltage and regulates it. ThedJV嘉泰姆 feedback threshold voltage is 0.8V.dJV嘉泰姆
3dJV嘉泰姆	SWdJV嘉泰姆	Power Switch Output Pin (SW). SW is the switch node thatdJV嘉泰姆 supplies power to the output.dJV嘉泰姆
4dJV嘉泰姆	ENdJV嘉泰姆	Enable Pin. Drive EN pin high to turn on the device, drive itdJV嘉泰姆 low to turn it off.dJV嘉泰姆
5dJV嘉泰姆	VINdJV嘉泰姆	Supply Voltage Input Pin. CXSD6257 operates from a 5V to 32VdJV嘉泰姆 DC voltage. Bypass Vin to GND with a suitably largedJV嘉泰姆 capacitor to eliminate noise on the input.dJV嘉泰姆

六.电路原理图dJV嘉泰姆
dJV嘉泰姆
dJV嘉泰姆
dJV嘉泰姆
七.CXSD6257 DEMO BOARD MANUALdJV嘉泰姆
(一)CXSD6257 12V 转 5V 应用电路测试数据：dJV嘉泰姆
1． CXSD6257 12V 转 5V（负载 0.5A~4A）应用电路图：dJV嘉泰姆
2. CXSD6257 12V 转 5V（负载 0.5A~4A）测试数据及效率图：dJV嘉泰姆

输入电压（V）dJV嘉泰姆	输入电流（A）dJV嘉泰姆	输出电压（V）dJV嘉泰姆	输出电流（A）dJV嘉泰姆	效率（%）dJV嘉泰姆
11.822dJV嘉泰姆	0.242dJV嘉泰姆	5.010dJV嘉泰姆	0.5dJV嘉泰姆	87.56dJV嘉泰姆
11.648dJV嘉泰姆	0.476dJV嘉泰姆	5.007dJV嘉泰姆	1dJV嘉泰姆	90.31dJV嘉泰姆
11.476dJV嘉泰姆	0.721dJV嘉泰姆	5.007dJV嘉泰姆	1.5dJV嘉泰姆	90.77dJV嘉泰姆
11.409dJV嘉泰姆	0.967dJV嘉泰姆	5.001dJV嘉泰姆	2dJV嘉泰姆	90.66dJV嘉泰姆
11.402dJV嘉泰姆	1.217dJV嘉泰姆	4.995dJV嘉泰姆	2.5dJV嘉泰姆	89.99dJV嘉泰姆
11.341dJV嘉泰姆	1.486dJV嘉泰姆	4.991dJV嘉泰姆	3dJV嘉泰姆	88.85dJV嘉泰姆
11.296dJV嘉泰姆	1.762dJV嘉泰姆	4.982dJV嘉泰姆	3.5dJV嘉泰姆	87.61dJV嘉泰姆
11.148dJV嘉泰姆	2.052dJV嘉泰姆	4.973dJV嘉泰姆	4dJV嘉泰姆	86.96dJV嘉泰姆

dJV嘉泰姆
(二)CXSD6257 24V 转 12V 应用电路测试数据：dJV嘉泰姆
1．CXSD6257 24V 转 12V（负载 0.5A~4A）应用电路图：dJV嘉泰姆
2. CXSD6257 24V 转 12V（负载 0.5A~4A）测试数据及效率：dJV嘉泰姆

输入电压（V）dJV嘉泰姆	输入电流（A）dJV嘉泰姆	输出电压（V）dJV嘉泰姆	输出电流（A）dJV嘉泰姆	效率（%）dJV嘉泰姆
23.95dJV嘉泰姆	0.293dJV嘉泰姆	12.07dJV嘉泰姆	0.5dJV嘉泰姆	86.00dJV嘉泰姆
23.81dJV嘉泰姆	0.555dJV嘉泰姆	12.06dJV嘉泰姆	1dJV嘉泰姆	91.26dJV嘉泰姆
23.60dJV嘉泰姆	0.826dJV嘉泰姆	12.05dJV嘉泰姆	1.5dJV嘉泰姆	92.72dJV嘉泰姆
23.42dJV嘉泰姆	1.101dJV嘉泰姆	12.04dJV嘉泰姆	2dJV嘉泰姆	93.39dJV嘉泰姆
23.28dJV嘉泰姆	1.378dJV嘉泰姆	12.03dJV嘉泰姆	2.5dJV嘉泰姆	93.75dJV嘉泰姆
23.12dJV嘉泰姆	1.669dJV嘉泰姆	12.01dJV嘉泰姆	3dJV嘉泰姆	93.37dJV嘉泰姆
23.00dJV嘉泰姆	1.960dJV嘉泰姆	12.00dJV嘉泰姆	3.5dJV嘉泰姆	93.17dJV嘉泰姆
22.82dJV嘉泰姆	2.262dJV嘉泰姆	11.98dJV嘉泰姆	4dJV嘉泰姆	92.83dJV嘉泰姆

dJV嘉泰姆
(三)CXSD6257 PCB 板布局建议：dJV嘉泰姆
（1）流大电流的线要粗，短，不拐弯。dJV嘉泰姆
（2）1 脚（GND），5 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 5 脚dJV嘉泰姆
（VIN）和 1 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）dJV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。dJV嘉泰姆
（4）2 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。dJV嘉泰姆
（5）增加 PCB 板铜薄的厚度。（DEMO 板用 130um 厚铜薄双面 PCB 板材料）dJV嘉泰姆
（6）适当的增加 CXSD6257 芯片衬底与 PCB 板的接触面积，提高芯片散热能力，注意 CXSD6257 芯片衬底是 SW 端。CXSD6257PCB 图:dJV嘉泰姆
(四)CXSD6257 温度测试数据dJV嘉泰姆
1：CXSD6257 电路图和 PCB 图：dJV嘉泰姆
dJV嘉泰姆
2：CXSD6257 DEMO 板工作时（12V 转 5V）各元件温度，自然通风，室温：27℃。dJV嘉泰姆
dJV嘉泰姆
(五)CXSD6257 实现恒流具体方案1CXSD6257 恒流原理图dJV嘉泰姆
说明：先把 RCS 的功耗降下来，把 VRCS 放大几倍之后与 FB 关联。其中放大器dJV嘉泰姆
VAR1=VRCS(1+R6/R5) ，例如设定恒流电路单路 ICS =300mA，RCS=0.33R, 那么 VCS=RCS*ICSdJV嘉泰姆
0.099V 由于 VAR1＝0.8V 那么放大器调解成放大 8.倍，那么 R5,R6 的值就可以得出来了。dJV嘉泰姆
八,功能概述dJV嘉泰姆
dJV嘉泰姆

ParameterdJV嘉泰姆	SymboldJV嘉泰姆	ValuedJV嘉泰姆	UnitdJV嘉泰姆
Input VoltagedJV嘉泰姆	VindJV嘉泰姆	-0.3 to 35dJV嘉泰姆	VdJV嘉泰姆
Feedback Pin VoltagedJV嘉泰姆	VFBdJV嘉泰姆	-0.3 to VindJV嘉泰姆	VdJV嘉泰姆
EN Pin VoltagedJV嘉泰姆	VENdJV嘉泰姆	-0.3 to VindJV嘉泰姆	VdJV嘉泰姆
Output Switch Pin VoltagedJV嘉泰姆	VOutputdJV嘉泰姆	-0.3 to VindJV嘉泰姆	VdJV嘉泰姆
Power DissipationdJV嘉泰姆	PDdJV嘉泰姆	Internally limiteddJV嘉泰姆	mWdJV嘉泰姆
Thermal Resistance (TO252)dJV嘉泰姆 (Junction to Ambient, No Heatsink, Free Air)dJV嘉泰姆	RJAdJV嘉泰姆	50dJV嘉泰姆	oC/WdJV嘉泰姆
Operating Junction TemperaturedJV嘉泰姆	TJdJV嘉泰姆	-40 to 125dJV嘉泰姆	oCdJV嘉泰姆
Storage TemperaturedJV嘉泰姆	TSTGdJV嘉泰姆	-65 to 150dJV嘉泰姆	oCdJV嘉泰姆
Lead Temperature (Soldering, 10 sec)dJV嘉泰姆	TLEADdJV嘉泰姆	260dJV嘉泰姆	oCdJV嘉泰姆
ESD (HBM)dJV嘉泰姆		2000dJV嘉泰姆	VdJV嘉泰姆

九,相关芯片选择指南dJV嘉泰姆
dJV嘉泰姆

降压型直流电源变换器芯片(大功率型)dJV嘉泰姆
产品型号dJV嘉泰姆	输入电压dJV嘉泰姆	开关电流dJV嘉泰姆	开关频率dJV嘉泰姆	电压版本dJV嘉泰姆	封装类型dJV嘉泰姆
CXSD6257dJV嘉泰姆	5V ~ 32VdJV嘉泰姆	4AdJV嘉泰姆	300KHzdJV嘉泰姆	Adj (0.8V)dJV嘉泰姆	TO252-5LdJV嘉泰姆
CXSD6258dJV嘉泰姆	5V ~ 32VdJV嘉泰姆	5AdJV嘉泰姆	300KHzdJV嘉泰姆	Adj (0.8V)dJV嘉泰姆	TO263-5LdJV嘉泰姆
CXSD6259dJV嘉泰姆	8V ~ 36VdJV嘉泰姆	4AdJV嘉泰姆	180KHzdJV嘉泰姆	Adj (1.25V)dJV嘉泰姆	TO252-5LdJV嘉泰姆
CXSD6260dJV嘉泰姆	8V ~ 36VdJV嘉泰姆	5AdJV嘉泰姆	180KHzdJV嘉泰姆	Adj (1.25V)dJV嘉泰姆	TO263-5LdJV嘉泰姆
CXSD6261dJV嘉泰姆	8V ~ 40VdJV嘉泰姆	8AdJV嘉泰姆	180KHzdJV嘉泰姆	Adj (1.25V)dJV嘉泰姆	TO220-5LdJV嘉泰姆

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