Texas Instruments,LM3401MM,LM3401MMX,LM3401MM,不可调光和可调光的高功率LED驱动控制器LM3401MM,External MOS high power LED driver,Can design 3A within the drive current,Input voltage up to 35V,Can be a series of more than 10 LED,LM3401 Hysteretic PFET Controller for High Power LED Drive

Replacement models :	LM3401MM
Package :	,MSOP8,VSSOP8,
Topological :	外置MOS开关式降压LED驱动器
LED serial number :	1~10串
Dimming mode :	PWM调光
Switching frequency :	1.5MHz
Mosfet :	外置MOS,可以设计3A以内的驱动电流
Max. Output Current :	3A
Output voltage :	0.2~33V
Input voltage :	4.5~35V
Typical applications :	舞台灯，MR16射灯，投光灯
Efficiency :	85%
Current accuracy :	±5%

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LM3401 Hysteretic PFET Controller for High Power LED Drive

TI LM3401MM Summary

The LM3401 is a switching controller designed to provide constant current to high power LEDs. The LM3401 drives an external P-MOSFET switch for step-down (Buck) regulators. The LM3401 delivers constant current within ±6% accuracy to a wide variety and number of series connected LEDs. Output current is adjusted with an external current sensing resistor to drive high power LEDs in excess of 1A.

For improved accuracy and efficiency, the LM3401 features dual-side hysteresis, very low reference voltage, and short propagation delay. A cycle by cycle current limit provides protection against over current and short circuit failures. Additional features include adjustable hysteresis and a CMOS compatible input pin for PWM dimming.

TI LM3401MM product features

■Hysteretic Control for Speed and Simplicity

■Input Operating Range of 4.5V-35V

■1.5MHz Maximum Switching Frequency

■Low 200mV Reference Voltage

■Programmable Current Limit

■High speed CMOS Compatible Enable/Dimming

■Adjustable Hysteresis

■Input UVLO

■No output Capacitor Required

■8-pin VSSOP Package

TI LM3401MM application

■LED Driver

■Battery Charger

TI LM3401MM Typical Application

TI LM3401MM CONNECTION DIAGRAM

TI LM3401MM PACKAGING INFORMATION

Orderable Device	Package Type	Pins	Package Qty
LM3401MM	MSOP-8	8	1000
LM3401MMX	MSOP-8	8	3500

TI LM3401MM PIN DESCRIPTIONS

Pin #	Pin Name	Description
1	CS	Current sense pin. Connect to the PFET drain
2	DIM	Dimming input pin. When DIM is low, the HG drive is off. Can be connected to a logic level PWM signal
3	SNS	Current feedback pin – to LED cathode. Connect a resistor from this pin to ground to set the DC LED current
4	HYS	Hysteresis adjust pin. Connect a resistor from this pin to GND to set the hysteresis window
5	GND	Ground pin
6	HG	Gate drive output. Connect to the PFET gate
7	VIN	Power supply input
8	ILIM	Current limit adjust pin. Connect a resistor from this pin to the PFET source to set the current limit threshold

This reference design was based on the released LM3401 evaluation board and associated application note AN-1657. The circuit and BOM was modified to optimize performance in MR16 solutions. A PCB was created that fits into the MR16 cavity. For fast bench set-up, the LM3401 evaluation board can be modified with the LM3401 MR16 bill of materials that is listed in the design document.

This design was developed to minimize the current spikes coming out of an electronic transformer to less than 5A, which is a typical transformer rating, when driving an LED MR16 circuit. The off the shelf LED MR16 solutions exhibit spikes that significantly exceed a transformer's maximum rated output current which will degrade the reliability of the transformer and reduce its operating lifetime. This LM3401 evaluation board is designed to operate (flicker-free) with common Electronic Low Voltage dimmers, and Electronic Transformers.

This design also generates a constant LED current over most of the power cycle when an electronic transformer is on versus the short bursts of current applied to an LED stack from the off the shelf LED MR16 bulbs. This results in better power factor and more stable circuit operation.

MR16,LM3401MM,LM3401MMX