CXMD3256电压模式固定200kHz 300kHz 600kHz开关频率同步降压转换器单个5~12伏或两个电源电压上电复位POR电路监测VCC电源电压防止错误的逻辑控制带外部补偿的电压模式PWM操作

CXMD3256是一种电压模式，固定200kHz/300kHz/600kHz开关频率，同步降压转换器。CXSD6296允许宽输入电压，可以是单个5~12伏或两个电源电压，适用于各种应用。上电复位（POR）电路监测VCC电源电压，以防止错误的逻辑控制。在软启动电路中，它既能防止输出电压过冲，又能限制输入电流。为满足低输出电压应用的要求，设计了一种高精度的0.6V/0.8V温度补偿参考电压。CXSD6296针对负载电流变化提供了卓越的输出电压调节。控制器的过电流保护通过使用低边MOSFET的RDS（ON）上的电压降来监测输出电流，从而消除了对电流传感电阻的需求，该电阻具有高效率和低成本的特点。此外，CXMD3256还集成了excel-lent保护功能。过电压保护（OVP）、欠电压保护（UVP）。监视FB电压以防止PWM输出过电压的OVP电路和监视FB电压以防止PWM输出过电压或短路的UVP电路。CXMD3256在SOP-8P中提供

宽5V至12V电源电压
VCC上电复位监控
良好的输出电压调节
CXMD3256/A/D的0.6V内部参考电压
CXMD3256B/C的0.8V内部参考电压
超过温度范围±0.6%
集成软启动
带外部补偿的电压模式PWM操作
高达90%DutyRatio，快速瞬态响应
恒定开关频率
CXMD3256/B为300kHz±10%
CXMD3256C为200kHz±10%
CXMD3256A/D为600kHz±10%
集成自举正激P-CH MOSFET
50%欠压保护
125%过电压保护
可调过流保护阈值
使用低边MOSFET的RDS（ON）
关闭控制byCOMP
SOP-8P包
提供无铅和绿色设备

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（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

 

产品概述 返回TOP

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The CXMD3256 is a voltage mode, fixed 200kHz/300kHz/600kHz switching frequency,synchronous buck converter. The CXSD6296 allows wide input voltage that is either a single 5~1 2V or two supply voltage(s) for various applications. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. Abuilt- in soft-start circuit prevents the output voltages from over- shoot as well as limits the input current. An internal 0.6V/0.8V Temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low out- put voltage applications. The CXSD6296 provides excel- lent output voltage regulations against load current variation. The controller’s over-current protection monitors the out- put current by using the voltage drop across the RDS (ON) of low-side MOSFET, eliminating the need for a cur- rent sensing resistor that features high efficiency and low cost. In addition, the CXMD3256 also integrates excel- lent protection functions. The over-voltage protection (OVP), under-voltage protection (UVP). OVP circuit which monitors the FB voltage to prevent the PWM output from over voltage, and UVP circuit which monitors the FB voltage to prevent the PWM output from under voltage or short circuit.The CXMD3256 is available in SOP-8P packages

   产品特点 返回TOP

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Wide 5V to 12V Supply Voltage

Power-On-Reset Monitoring on VCC

Excellent Output Voltage Regulations

0.6V Internal Reference for CXMD3256/A/D

0.8V Internal Reference for CXMD3256B/C

±0.6% Over-Temperature Range

Integrated Soft-Start

Voltage Mode PWM Operation with External Compensation

Up to 90%DutyRatio for Fast Transient Response

Constant Switching Frequency

300kHz ±10% for CXMD3256/B

200kHz ±10% for CXMD3256C

600kHz ±10% for CXMD3256A/D

Integrated Bootstrap Forward P-CH MOSFET

50%Under-Voltage Protection

125%Over-Voltage Protection

Adjustable Over-Current Protection Threshold

Using the RDS(ON) of Low-Side MOSFET

Shutdown Control byCOMP

SOP-8P Package

Lead Free and Green Devices Available

   应用范围 返回TOP

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Graphic Cards

DSL, Switch HUB

Wireless Lan

Notebook Computer

Mother Board

    LCD Monitor/TV

   技术规格书（产品PDF) 返回TOP 

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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！

 

产品封装图 返回TOP

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电路原理图 返回TOP

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PWM Controller(脉宽调制控制器)
Part No.	Input Voltage	Output  Voltage	Frequency	Efficiency	Package	precision	Over	Over	Short  Protection
							Current	Temperature
							Protection	Protection
CXMD3255	16V	ADJ	300KHZ	93%	SOP8/DFN3*3-10DFN3*3-10	2%	Y	Y	Y
CXMD3256	16V	ADJ	200KHz/300KHZ /600KHz	93%	SOP8 DFN3*3-10	2%	Y	Y	Y
CXMD3257	35V	ADJ	290-430KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3258	35V	ADJ	290-430KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3259	35V	ADJ	135-215KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3260	35V	ADJ	135-215KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3261	40V	-	100-300KHz	-	QFN20		Y	Y	Y