Datasheet

Target Datasheet 4 Rev. 1.0, 2009-07-06

ILD4001

Step down - LED controller IC for external power stages

Bipolar Buck- converter LED Controller IC

1 Bipolar Buck- converter LED Controller IC

2 Description

The ILD4001 is a hysteretic buck LED controller IC for industrial applications realized in a bipolar IC technology.

The LED Controller is capable to drive external bipolar or MOSFET power transistors by using the internal push-

pull output stage.

The IC incorporates a wide input voltage range and the output current level can be adjusted with an external sense

resistor.

According to the multifunctional control pin the IC can be switched on and off by an external signal, which is also

suitable to regulate brightness of the LEDs by PWM dimming.

Depending on the value of the switching inductor the switching frequency and the voltage ripple could be set.

The precise internal bandgap stabilizes the circuit and provides stable current conditions over temperature range.

Furthermore, over voltage protection and temperature shut down mechanism enforce the IC to protect attached

LEDs.

Additional features are included to protect the LED’s from overload, short circuit events as well as from over

voltage. The LED’s can be also protected against thermal overload by thermally coupling the LED’s to the

ILD4001.

Features

• Wide Input Voltage Range: 4.5V ... 40 V

• Over voltage protection

• Temperature shut down mechanism

• Integrated push- pull stage for fast on/off- switching

• Soft- Start capability

• Low shut down current < 200nA in operating voltage range

• Multifunctional Enable Pin

• Analog and PWM dimming possible

• PWM control for LED brightness possible

• Typical 3% output current accuracy

• Minimum external component required

• Small Package: SC-74

Applications

• LED Controller for industrial applications

• Universal Constant Current Source

• Generell Illumination e.g. Halogen Replacement

• Residential Architectural and Industrial Commercial Lighting for

in- and outdoor

• Signal and Marker Lights for Orientation or Navigation

(e.g. steps, exit ways, etc.)