Single Buck Voltage Mode PWM Controller CXMD3255 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXMD3255 allows wide input voltage that is either a single 5~12V-行业新闻-嘉泰姆电源方案

Single Buck Voltage Mode PWM Controller CXMD3255 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXMD3255 allows wide input voltage that is either a single 5~12V

The CXMD3255 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXMD3255 allows wide input voltage that is either a single 5~12V or two supply voltage(s) for various applications. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A builtin soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The CXMD3255 provides excellent output voltage regulations against load current variation. The controller’s over-current protection monitors the output current by using the voltage drop across the RDS(ON) of low-side MOSFET, eliminating the need for a current sensing resistor that features high efficiency and low cost. In addition, the CXMD3255 also integrates excellent protection functions: The over-voltage protection (OVP) , under- voltage protection (UVP). OVP circuit which monitors the FB voltage to prevent the PWM output from overvoltage,and UVP circuit which monitors the FB voltage to prevent the PWM output from under-voltage or short-circuit.The CXMD3255is available in SOP-8P and TDFN3x3-10 packages.

产品特点 返回TOP

l Wide 5V to 16V Supply Voltage

l Power-On-Reset Monitoring on VCC

l Excellent Output Voltage Regulations 0.8V

Internal Reference ±1% Over-Temperature Range

l Integrated Soft-Start

l Voltage Mode PWM Operation with External Compensation

l Up to 90% Duty Ratio for Fast Transient Response

l Constant Switching Frequency 300kHz ±10%

l Drive Dual Low Cost N-MOSFETs with Adaptive Dead-Time Control

l 50% Under-Voltage Protection

l 125% Over-Voltage Protection

l Adjustable Over-Current Protection Threshold Using the RDS(ON) of Low-Side MOSFET

l Shutdown Control by COMP

l Power Good Monitoring (TDFN-10 3mmx3mm Package Only)

l SOP-8P and TDFN3x3-10 Packages

l Lead Free and Green Devices Available (RoHS Compliant

应用范围 返回TOP

 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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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/DFN33-10DFN33-10	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

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Single Buck Voltage Mode PWM Controller CXMD3255 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXMD3255 allows wide input voltage that is either a single 5~12V

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