High Power Factor & Accuracy Constant

Current LED Driver

EC4188B

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4C26N-Rev.P001

General Description

The EC4188B is

a

highly-integrated, low startup

current, average current mode, one cycle control

PFC and fixed switching frequency PWM controller.

These functions enable the LED driver to easily

meet the accuracy average LED current

and high power factor requirements. The

integrated functions also include the LED short

protection, open protection, and internal over

temperature protection. The COMP pin controls

the duty by connected

an RC compensation

network to ground and forming the closed loop

feedback control. To protect the external power

MOSFET from being damaged by supply over

voltage, the EC4188B OUT pin voltage is

clamped to about 15V.

The EC4188B improves the performance and

reduces the cost of the LED driver. It is a 6-pin

SOT23-6L package.

Features

●Accuracy Constant Current

●Low BOM Cost

●Linear Dimming on DIM Pin

●Average Current / Fixed Frequency Control

●Gate Output Voltage Clamp

●LED Open Protection (OVP)

●LED Short Protection (SCP)

●Over Current Protection (OCP)

●Internal OTP Protection

●300mA Driving Capability for OUT Pin

●Fast Start Current

●Incompatible Electronic Ballast and Inductance

Ballast

Applications

Pin Assignments

Pin Description

Pin No.

Name

Function

1

VCC

Power Supply Pin

2

GND

Ground Pin

3

OUT

The Output Driver for Driving The External MOSFET

4

DIM

Dimming Control Pin by Input a DC Voltage

5

COMP

Feedback Compensation Network

6

CS

Current Sense Pin, Connect to Sense The MOSFET Current