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：717 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DSG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DSG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）

DSG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！DSG嘉泰姆

QQ截图20160419174301.jpg DSG嘉泰姆

五,产品封装图 (Package)

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Pin NumberDSG嘉泰姆	Pin NameDSG嘉泰姆	DescriptionDSG嘉泰姆
1,6,8DSG嘉泰姆	NCDSG嘉泰姆	No Connected.DSG嘉泰姆
2DSG嘉泰姆	VINDSG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.DSG嘉泰姆
3DSG嘉泰姆	SWDSG嘉泰姆	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.DSG嘉泰姆
4DSG嘉泰姆	GNDDSG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.DSG嘉泰姆
5DSG嘉泰姆	FBDSG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.DSG嘉泰姆
7DSG嘉泰姆	ENDSG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.DSG嘉泰姆

六.电路原理图

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七,功能概述

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ParameterDSG嘉泰姆	SymbolDSG嘉泰姆	ValueDSG嘉泰姆	UnitDSG嘉泰姆
Input VoltageDSG嘉泰姆	VinDSG嘉泰姆	-0.3 to 20DSG嘉泰姆	VDSG嘉泰姆
Feedback Pin VoltageDSG嘉泰姆	VFBDSG嘉泰姆	-0.3 to VinDSG嘉泰姆	VDSG嘉泰姆
EN Pin VoltageDSG嘉泰姆	VENDSG嘉泰姆	-0.3 to VinDSG嘉泰姆	VDSG嘉泰姆
Output Switch Pin VoltageDSG嘉泰姆	VOutputDSG嘉泰姆	-0.3 to VinDSG嘉泰姆	VDSG嘉泰姆
Power DissipationDSG嘉泰姆	PDDSG嘉泰姆	Internally limitedDSG嘉泰姆	mWDSG嘉泰姆
Thermal Resistance (SOP8) (Junction to Ambient, No Heatsink, Free Air)DSG嘉泰姆	RJADSG嘉泰姆	100DSG嘉泰姆	oC/WDSG嘉泰姆
Operating Junction TemperatureDSG嘉泰姆	TJDSG嘉泰姆	-40 to 125DSG嘉泰姆	oCDSG嘉泰姆
Storage TemperatureDSG嘉泰姆	TSTGDSG嘉泰姆	-65 to 150DSG嘉泰姆	oCDSG嘉泰姆
Lead Temperature (Soldering, 10 sec)DSG嘉泰姆	TLEADDSG嘉泰姆	260DSG嘉泰姆	oCDSG嘉泰姆
ESD (HBM)DSG嘉泰姆		2000DSG嘉泰姆	VDSG嘉泰姆

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

参数DSG嘉泰姆	符号DSG嘉泰姆	值</span>DSG嘉泰姆	单位DSG嘉泰姆
输入电压DSG嘉泰姆	VINDSG嘉泰姆	3.6 to 18DSG嘉泰姆	VDSG嘉泰姆
输出电压DSG嘉泰姆	VOUTDSG嘉泰姆	5DSG嘉泰姆	VDSG嘉泰姆
输出电流DSG嘉泰姆	IOUTDSG嘉泰姆	0 to 2DSG嘉泰姆	ADSG嘉泰姆

1． CXSD6253 12V 转 5V（负载 0.2A—2A）应用电路图： DSG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。DSG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℃。DSG嘉泰姆

输出负载电流DSG嘉泰姆	0.2ADSG嘉泰姆	0.5ADSG嘉泰姆	1ADSG嘉泰姆	1.5ADSG嘉泰姆	2ADSG嘉泰姆
27℃</span>DSG嘉泰姆	28℃</span>DSG嘉泰姆	31℃</span>DSG嘉泰姆	33℃</span>DSG嘉泰姆	42℃</span>DSG嘉泰姆
电感（33uH/2A）</span>DSG嘉泰姆	24℃</span>DSG嘉泰姆	25℃</span>DSG嘉泰姆	28℃</span>DSG嘉泰姆	29℃</span>DSG嘉泰姆	35℃</span>DSG嘉泰姆
肖特基二极管（IN5822）</span>DSG嘉泰姆	22℃</span>DSG嘉泰姆	25℃</span>DSG嘉泰姆	26℃</span>DSG嘉泰姆	30℃</span>DSG嘉泰姆	35℃</span>DSG嘉泰姆
输入电容（35V/220uF）</span>DSG嘉泰姆	22℃</span>DSG嘉泰姆	23℃</span>DSG嘉泰姆	25℃</span>DSG嘉泰姆	26℃</span>DSG嘉泰姆	31℃</span>DSG嘉泰姆
输出电容（35V/220uF）</span>DSG嘉泰姆	22℃</span>DSG嘉泰姆	23℃</span>DSG嘉泰姆	24℃</span>DSG嘉泰姆	26℃</span>DSG嘉泰姆	29℃</span>DSG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)DSG嘉泰姆
产品型号DSG嘉泰姆	输入电压DSG嘉泰姆	开关电流</span>DSG嘉泰姆	开关频率</span>DSG嘉泰姆	电压版本DSG嘉泰姆	封装类型DSG嘉泰姆
CXSD6253DSG嘉泰姆	3.6V ~ 18VDSG嘉泰姆	2ADSG嘉泰姆	380KHzDSG嘉泰姆	Adj (1.222V)DSG嘉泰姆	SOP8LDSG嘉泰姆
CXSD6254DSG嘉泰姆	3.6V ~ 23VDSG嘉泰姆	3ADSG嘉泰姆	380KHzDSG嘉泰姆	Adj (1.222V)DSG嘉泰姆	SOP8LDSG嘉泰姆
CXSD6255DSG嘉泰姆	3.6V ~ 18VDSG嘉泰姆	2ADSG嘉泰姆	380KHzDSG嘉泰姆	Adj (0.8V)DSG嘉泰姆	SOP8LDSG嘉泰姆
CXSD6256DSG嘉泰姆	3.6V ~ 18VDSG嘉泰姆	3ADSG嘉泰姆	380KHzDSG嘉泰姆	Adj (0.8V)DSG嘉泰姆	SOP8LDSG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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