EC4304C Datasheet, PDF (1/8 Pages) E-CMOS Corporation – 1.5A, Hysteretic, High Brightness LED Driver with Internal Switch

1.5A, Hysteretic, High Brightness
LED Driver with Internal Switch
EC4304C
GENERAL DESCRIPTION
FEATURES
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 soft-
start 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.
 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
Pin Configuration
Pin Description
Pin No Pin Name
1
VIN
2/3/6/7
4
GND
ISENSE
5
ADJ
8
LX
Exposed PAD
Pin Function
Power supply input pin. Connect a nominal (7V~40V) power supply to this pin. The
power- on-reset (POR) function monitors the input voltage by this pin. It is
recommended that a decoupling capacitor (4.7μF or Higher X7R Ceramic capacitor) be
connected to the GND for noise decoupling.
Ground for the IC. All voltages levels are measured with respect to this pin.
Current Sense Pin: Sense LED String Current.
Multi-Function ON/OFF and Brightness Control Pin:
-Analog signal input for analog control of PWM dimming.
-PWM signal input for digital PWM dimming.
Drain of NDMOS Switch.
Ground and thermal Pad
E-CMOS Corp. (www.ecmos.com.tw)
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