General Description

The EC4304C is a continuous mode inductive step-down and buck-boost converter, designed for driving single or
multiple series connected LEDs from a voltage source higher than or lower than the LED voltage.
It operates from input supply between 7V and 40V and provides and externally adjustable output current up to 1.5A with proper supply voltage and external components, the EC4304C can provide more than 50 watts of output power.
This EC4304C includes the output switch and high-side output current sensing circuit, which uses an external
resistor to set the nominal average output current.
The ADJ pin will accept either a wide range pulse dimming waveform or a DC voltage. This will provide either a continuous or gated output current depending upon the control frequency. The soft-start time can be increased
by connecting an external capacitor from the ADJ pin to ground. The PWM filter components also serve as softstart time setting.
Applying a 0.2V or lower to the ADJ pin turns the output off and switches the device into a low current standby state.

FEATURES

◆ Operates from 7V to 40V Supply Voltage
◆ Single Pin On/Off and Brightness Control Using DC Voltage or PWM
◆ Up to 95% Efficiency
◆ Internal 40V NDMOS Switch
◆ Up to 1.5A Output Current
◆ Typical +/-5% LED Current Accuracy
◆ Input Under Voltage Lockout
◆ SOP 8L(Exposed PAD) Package
◆ RoHS Compliant and Halogen-Free

Applications

◆ Automotive LED Lighting
◆ High Power LED Lighting
◆ Indicator and Emergency Lighting
◆ Architectural Lighting
◆ Low Voltage Industrial Lighting
◆ Signage and Decorative LED Lighting