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SD3361C 输入电压6~40V 降压转换器 LED驱动IC

Simple low parts count  Internal 40V NDMOS switch  1A output current  Single pin on/off and brightness control Using DC voltage or PWM  Soft-start  High  efficiency (up to 97%)   Wide input voltage range: 6V to 40V  Output shutdown  Qpen LED Protection  Short  LED Protection  Up to 1MHz switching frequency  Inherent open-circuit LED protection  Typical 5% output current accuracy  Pb-free SOT23-5 and SOT89-5 Packages 

     Applications

Low voltage halogen replacement LEDs

Low voltage industrial lighting

LED back-side lighting

Illuminated signs

    Description

The SD3361  is a continuous mode inductive
step-down converter, designed for driving single
or multiple series connected LEDs efficiently from
a voltage source higher than the LED voltage. The
device operates from an input supply between 6V
and 40V and provides an externally adjustable
output current of up to 1A. Depending upon supply
voltage and external components, this can
provide up to 30 watts of output power.

The SD3361 1 includes the output switch and a
high-side output current sensing circuit, which
uses an external resistor to set the nominal
average output current

Output current can be adjusted below the set
value, by applying an external control signal to theVSET Pin

The VSET pin will accept either a DC voltage or aPWM waveform

The soft-start time can be increased using an
external capacitor from the VSET pin to ground.
Applying a voltage of 0.2V or lower to the VSET
pin turns the output off and switches the device
into a low current standby state.