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：712 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pZz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pZz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！pZz嘉泰姆

QQ截图20160419174301.jpg pZz嘉泰姆

五,产品封装图 (Package)

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Pin NumberpZz嘉泰姆	Pin NamepZz嘉泰姆	DescriptionpZz嘉泰姆
1,6,8pZz嘉泰姆	NCpZz嘉泰姆	No Connected.pZz嘉泰姆
2pZz嘉泰姆	VINpZz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.pZz嘉泰姆
3pZz嘉泰姆	SWpZz嘉泰姆	Power Switch Output Pin (SW). Output is the switch node that supplies power to the output.pZz嘉泰姆
4pZz嘉泰姆	GNDpZz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.pZz嘉泰姆
5pZz嘉泰姆	FBpZz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.pZz嘉泰姆
7pZz嘉泰姆	ENpZz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.pZz嘉泰姆

六.电路原理图

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七,功能概述

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ParameterpZz嘉泰姆	SymbolpZz嘉泰姆	ValuepZz嘉泰姆	UnitpZz嘉泰姆
Input VoltagepZz嘉泰姆	VinpZz嘉泰姆	-0.3 to 20pZz嘉泰姆	VpZz嘉泰姆
Feedback Pin VoltagepZz嘉泰姆	VFBpZz嘉泰姆	-0.3 to VinpZz嘉泰姆	VpZz嘉泰姆
EN Pin VoltagepZz嘉泰姆	VENpZz嘉泰姆	-0.3 to VinpZz嘉泰姆	VpZz嘉泰姆
Output Switch Pin VoltagepZz嘉泰姆	VOutputpZz嘉泰姆	-0.3 to VinpZz嘉泰姆	VpZz嘉泰姆
Power DissipationpZz嘉泰姆	PDpZz嘉泰姆	Internally limitedpZz嘉泰姆	mWpZz嘉泰姆
Thermal Resistance (SOP8) (Junction to Ambient, No Heatsink, Free Air)pZz嘉泰姆	RJApZz嘉泰姆	100pZz嘉泰姆	oC/WpZz嘉泰姆
Operating Junction TemperaturepZz嘉泰姆	TJpZz嘉泰姆	-40 to 125pZz嘉泰姆	oCpZz嘉泰姆
Storage TemperaturepZz嘉泰姆	TSTGpZz嘉泰姆	-65 to 150pZz嘉泰姆	oCpZz嘉泰姆
Lead Temperature (Soldering, 10 sec)pZz嘉泰姆	TLEADpZz嘉泰姆	260pZz嘉泰姆	oCpZz嘉泰姆
ESD (HBM)pZz嘉泰姆		2000pZz嘉泰姆	VpZz嘉泰姆

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

参数pZz嘉泰姆	符号pZz嘉泰姆	值</span>pZz嘉泰姆	单位pZz嘉泰姆
输入电压pZz嘉泰姆	VINpZz嘉泰姆	3.6 to 18pZz嘉泰姆	VpZz嘉泰姆
输出电压pZz嘉泰姆	VOUTpZz嘉泰姆	5pZz嘉泰姆	VpZz嘉泰姆
输出电流pZz嘉泰姆	IOUTpZz嘉泰姆	0 to 2pZz嘉泰姆	ApZz嘉泰姆

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

输出负载电流pZz嘉泰姆	0.2ApZz嘉泰姆	0.5ApZz嘉泰姆	1ApZz嘉泰姆	1.5ApZz嘉泰姆	2ApZz嘉泰姆
27℃</span>pZz嘉泰姆	28℃</span>pZz嘉泰姆	31℃</span>pZz嘉泰姆	33℃</span>pZz嘉泰姆	42℃</span>pZz嘉泰姆
电感（33uH/2A）</span>pZz嘉泰姆	24℃</span>pZz嘉泰姆	25℃</span>pZz嘉泰姆	28℃</span>pZz嘉泰姆	29℃</span>pZz嘉泰姆	35℃</span>pZz嘉泰姆
肖特基二极管（IN5822）</span>pZz嘉泰姆	22℃</span>pZz嘉泰姆	25℃</span>pZz嘉泰姆	26℃</span>pZz嘉泰姆	30℃</span>pZz嘉泰姆	35℃</span>pZz嘉泰姆
输入电容（35V/220uF）</span>pZz嘉泰姆	22℃</span>pZz嘉泰姆	23℃</span>pZz嘉泰姆	25℃</span>pZz嘉泰姆	26℃</span>pZz嘉泰姆	31℃</span>pZz嘉泰姆
输出电容（35V/220uF）</span>pZz嘉泰姆	22℃</span>pZz嘉泰姆	23℃</span>pZz嘉泰姆	24℃</span>pZz嘉泰姆	26℃</span>pZz嘉泰姆	29℃</span>pZz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)pZz嘉泰姆
产品型号pZz嘉泰姆	输入电压pZz嘉泰姆	开关电流</span>pZz嘉泰姆	开关频率</span>pZz嘉泰姆	电压版本pZz嘉泰姆	封装类型pZz嘉泰姆
CXSD6253pZz嘉泰姆	3.6V ~ 18VpZz嘉泰姆	2ApZz嘉泰姆	380KHzpZz嘉泰姆	Adj (1.222V)pZz嘉泰姆	SOP8LpZz嘉泰姆
CXSD6254pZz嘉泰姆	3.6V ~ 23VpZz嘉泰姆	3ApZz嘉泰姆	380KHzpZz嘉泰姆	Adj (1.222V)pZz嘉泰姆	SOP8LpZz嘉泰姆
CXSD6255pZz嘉泰姆	3.6V ~ 18VpZz嘉泰姆	2ApZz嘉泰姆	380KHzpZz嘉泰姆	Adj (0.8V)pZz嘉泰姆	SOP8LpZz嘉泰姆
CXSD6256pZz嘉泰姆	3.6V ~ 18VpZz嘉泰姆	3ApZz嘉泰姆	380KHzpZz嘉泰姆	Adj (0.8V)pZz嘉泰姆	SOP8LpZz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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