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：702 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81d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81d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！81d嘉泰姆

QQ截图20160419174301.jpg 81d嘉泰姆

五,产品封装图 (Package)

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Pin Number81d嘉泰姆	Pin Name81d嘉泰姆	Description81d嘉泰姆
1,6,881d嘉泰姆	NC81d嘉泰姆	No Connected.81d嘉泰姆
281d嘉泰姆	VIN81d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.81d嘉泰姆
381d嘉泰姆	SW81d嘉泰姆	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.81d嘉泰姆
481d嘉泰姆	GND81d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 CXSD6253.81d嘉泰姆
581d嘉泰姆	FB81d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.81d嘉泰姆
781d嘉泰姆	EN81d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.81d嘉泰姆

六.电路原理图

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七,功能概述

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Parameter81d嘉泰姆	Symbol81d嘉泰姆	Value81d嘉泰姆	Unit81d嘉泰姆
Input Voltage81d嘉泰姆	Vin81d嘉泰姆	-0.3 to 2081d嘉泰姆	V81d嘉泰姆
Feedback Pin Voltage81d嘉泰姆	VFB81d嘉泰姆	-0.3 to Vin81d嘉泰姆	V81d嘉泰姆
EN Pin Voltage81d嘉泰姆	VEN81d嘉泰姆	-0.3 to Vin81d嘉泰姆	V81d嘉泰姆
Output Switch Pin Voltage81d嘉泰姆	VOutput81d嘉泰姆	-0.3 to Vin81d嘉泰姆	V81d嘉泰姆
Power Dissipation81d嘉泰姆	PD81d嘉泰姆	Internally limited81d嘉泰姆	mW81d嘉泰姆
Thermal Resistance (SOP8) (Junction to Ambient, No Heatsink, Free Air)81d嘉泰姆	RJA81d嘉泰姆	10081d嘉泰姆	oC/W81d嘉泰姆
Operating Junction Temperature81d嘉泰姆	TJ81d嘉泰姆	-40 to 12581d嘉泰姆	oC81d嘉泰姆
Storage Temperature81d嘉泰姆	TSTG81d嘉泰姆	-65 to 15081d嘉泰姆	oC81d嘉泰姆
Lead Temperature (Soldering, 10 sec)81d嘉泰姆	TLEAD81d嘉泰姆	26081d嘉泰姆	oC81d嘉泰姆
ESD (HBM)81d嘉泰姆		200081d嘉泰姆	V81d嘉泰姆

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八.DEMO BOARD MANUAL
(一)CXSD6253 典型应用测试：  81d嘉泰姆

参数81d嘉泰姆	符号81d嘉泰姆	值</span>81d嘉泰姆	单位81d嘉泰姆
输入电压81d嘉泰姆	VIN81d嘉泰姆	3.6 to 1881d嘉泰姆	V81d嘉泰姆
输出电压81d嘉泰姆	VOUT81d嘉泰姆	581d嘉泰姆	V81d嘉泰姆
输出电流81d嘉泰姆	IOUT81d嘉泰姆	0 to 281d嘉泰姆	A81d嘉泰姆

1． CXSD6253 12V 转 5V（负载 0.2A—2A）应用电路图： 81d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。81d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℃。81d嘉泰姆

输出负载电流81d嘉泰姆	0.2A81d嘉泰姆	0.5A81d嘉泰姆	1A81d嘉泰姆	1.5A81d嘉泰姆	2A81d嘉泰姆
27℃</span>81d嘉泰姆	28℃</span>81d嘉泰姆	31℃</span>81d嘉泰姆	33℃</span>81d嘉泰姆	42℃</span>81d嘉泰姆
电感（33uH/2A）</span>81d嘉泰姆	24℃</span>81d嘉泰姆	25℃</span>81d嘉泰姆	28℃</span>81d嘉泰姆	29℃</span>81d嘉泰姆	35℃</span>81d嘉泰姆
肖特基二极管（IN5822）</span>81d嘉泰姆	22℃</span>81d嘉泰姆	25℃</span>81d嘉泰姆	26℃</span>81d嘉泰姆	30℃</span>81d嘉泰姆	35℃</span>81d嘉泰姆
输入电容（35V/220uF）</span>81d嘉泰姆	22℃</span>81d嘉泰姆	23℃</span>81d嘉泰姆	25℃</span>81d嘉泰姆	26℃</span>81d嘉泰姆	31℃</span>81d嘉泰姆
输出电容（35V/220uF）</span>81d嘉泰姆	22℃</span>81d嘉泰姆	23℃</span>81d嘉泰姆	24℃</span>81d嘉泰姆	26℃</span>81d嘉泰姆	29℃</span>81d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)81d嘉泰姆
产品型号81d嘉泰姆	输入电压81d嘉泰姆	开关电流</span>81d嘉泰姆	开关频率</span>81d嘉泰姆	电压版本81d嘉泰姆	封装类型81d嘉泰姆
CXSD625381d嘉泰姆	3.6V ~ 18V81d嘉泰姆	2A81d嘉泰姆	380KHz81d嘉泰姆	Adj (1.222V)81d嘉泰姆	SOP8L81d嘉泰姆
CXSD625481d嘉泰姆	3.6V ~ 23V81d嘉泰姆	3A81d嘉泰姆	380KHz81d嘉泰姆	Adj (1.222V)81d嘉泰姆	SOP8L81d嘉泰姆
CXSD625581d嘉泰姆	3.6V ~ 18V81d嘉泰姆	2A81d嘉泰姆	380KHz81d嘉泰姆	Adj (0.8V)81d嘉泰姆	SOP8L81d嘉泰姆
CXSD625681d嘉泰姆	3.6V ~ 18V81d嘉泰姆	3A81d嘉泰姆	380KHz81d嘉泰姆	Adj (0.8V)81d嘉泰姆	SOP8L81d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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