大功率DC转换器PWM控制CXSD62395同步整流buck拓扑中驱动两个N通道mosfet快速瞬态响应恒定300kHz开关频率

CXSD62395提供简单、单反馈、电压模式控制和快速瞬态响应。它包括一个300KHz自由运行的三角波振荡器。误差放大器采用15MHz增益带宽产品，为快速瞬态性能提供高转换带宽。由此产生的PWM占空比在0%到80%之间。参考电压为0.8V，精度为2%CXSD62395具有内部软启动，并在软启动间隔期间执行逐周电流限制。

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 CXSD62395 provides complete control and protection for a DC-DC converter for high power applications. It is designed to drive two N-channel MOSFETs in a synchronous-rectified buck topology. The CXSD62395 integrates all of the control, and protection functions into a single package. The CXSD62395 provides simple, single feedback loop, voltage-mode control with fast transient response. It includes a 300KHz free-running triangle-wave oscillator. The error amplifier features a 15MHz gain-bandwidth product which provides high converter bandwidth for fast transient performance. The resulting PWM duty ratio ranges from 0% to 80%. The reference voltage is 0.8V, 2% accuracy. The CXSD62395 has internal soft start and executes cycle-by-cycle current limit during soft start interval. The CXSD62395 monitors the current by using the RDS(ON) of the low-side MOSFET which eliminates the need for a current sensing resistor. The under-voltage protection function monitors voltage at FB pin. The over-current and under-voltage events after soft-start interval trigger hiccup mode protection.

   产品特点 返回TOP

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Drives Two N-Channel MOSFETs 

Operates at 5V Supply Voltage 

Voltage-Mode PWM Control 

Fast Transient Response 

0.8V, 2% Accuracy Reference Voltage 

Internal Soft Start 

Constant 300kHz Switching Frequency 

Over-Current Fault Monitors by Using Low-Side MOSFET RDS(ON) 

Output Under-Voltage Protection

   应用范围 返回TOP

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16V to 30V Input High Power DC-DC Regulators 

Low-Voltage Distributed Power Supplies

   技术规格书（产品PDF) 返回TOP 

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产品封装图 返回TOP

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电路原理图 返回TOP

 

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Synchronous Step Down Controller
Part   NO.	Vin(V) min	Vin(V) max	IOUT (A)	FSW (kHz)	FB (V)	Duty max(%)	VOUT (ms)	Note	Package
CXSD62393	2.5	5.5	--	300	1	100	15	EXT, VDD, GND,  CE, FB, Voltage Mode	SOT-23-5
CXSD62394	5	12	OCSET	300	0.8	--	14	BST, DH, GND, DL, VCC, FB, OC, LX	SOP-8
CXSD62395	--	24	OCSET	300	0.8	--	8	BST, DH, GND, DL, VCC, FB, OC, LX	SOP-8
CXSD62396	10	28	--	400	0.8	80	3	VCC, DL, GND, DH, BST, LX, VIN, FB	TSOT-23-8
CXSD62397	5	23	OCSET	400	0.8	80	8	DH, LX, DL, GND, FB, OC, VCC, BST	SOP-8
CXSD62398	4.5	27	RSENSE	ADJ	0.7	93	ADJ	Asynchronous  Voltage Mode Controller	MSOP-10(FD)