EC4304 Datasheet, PDF (1/13 Pages) E-CMOS Corporation – 1A, Hysteretic, High Brightness LED Driver with Internal Switch

1A, Hysteretic, High Brightness
LED Driver with Internal Switch
EC4304
GENERAL DESCRIPTION
FEATURES
The EC4304 is a high-efficiency continuous mode inductive
step-down converter which drives N-channel MOSFET and
it is designed for driving single or multiple series connected
LEDs from a voltage source higher than the LED voltage. It
operates from input supply between 7V and 40V and
provides and externally adjustable output current to 1A
which is depending on supply voltage and external
components.
This EC4304 includes the output switch and high-side
output current sensing circuit, which uses an external
resistor to set the output current.
The ADJ pin will accept either a DC voltage or a PWM
waveform. This will provide either a continuous or gated
output current depending upon the control frequency. The
PWM filter components contains a soft-start rising time
setting. The soft-start time can be increased by using an
external capacitor from the ADJ pin to ground. Applying a
0.2V or lower to the ADJ pin turns the output off and
switches the device into a low current standby state.
Operates from 7V to 40V Supply Voltage
Internal 40V NDMOS Switch
Output Current 1A
Single Pin On/Off and Brightness Control Using
DC Voltage or PWM
EC4304 to 95% Efficiency
Typical +/-5% LED Current Accuracy
Input Under Voltage Lockout
SOT23-5L、DFN 3x3 8L、SOT89-5L 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
Functional Block Diagram
E-CMOS Corp. (www.ecmos.com.tw)
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4B25N-Rev.F005