LM3409QMYX

更新时间： 2024-11-25 05:42:03

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器控制器
页数	文件大小	规格书
30页	965K
描述
PFET Buck Controller for High Power LED Drives

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LM3409QMYX 数据手册

April 12, 2010

LM3409 / LM3409HV

LM3409Q / LM3409QHV

PFET Buck Controller for High Power LED Drives

General Description

Features

■

The LM3409/09HV are P-channel MosFET (PFET) con-

trollers for step-down (buck) current regulators. They offer

wide input voltage range, high-side differential current sense

with low adjustable threshold voltage, fast output enable/dis-

able function and a thermally enhanced eMSOP-10 package.

These features combine to make the LM3409/09HV ideal for

use as constant current sources for driving LEDs where for-

ward currents up to 5A are easily achievable. The

LM3409/09Q/09HV/09QHV uses Constant Off-Time (COFT)

control to regulate an accurate constant current without the

need for external control loop compensation. Analog and

PWM dimming are easy to implement and result in a highly

linear dimming range with excellent achievable contrast ra-

tios. Programmable UVLO, low-power shutdown, and thermal

shutdown complete the feature set.

LM3409Q/LM3409QHV is an Automotive Grade product

that is AEC-Q100 grade 1 qualified

2Ω, 1A Peak MosFET Gate Drive

V_INRange: 6V to 42V (LM3409/LM3409Q)

V_INRange: 6V to 75V (LM3409HV/LM3409QHV)

Differential, High-side Current Sense

Cycle-by-Cycle Current Limit

■

No Control Loop Compensation Required

10,000:1 PWM Dimming Range

250:1 Analog Dimming Range

Supports All-Ceramic Output Capacitors and Capacitor-

less Outputs

Low Power Shutdown

■

Thermal Shutdown Protection

Thermally Enhanced eMSOP-10 Package

Applications

LED Driver

■

Constant Current Source

Automotive Lighting

General Illumination

Industrial Lighting

■

Typical Application

30085601

300856

www.national.com

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