GENERAL DESCRIPTION

OB3600 is a dimmable, highly integrated buck regulator with advanced features to provide high efficiency control and high precision constant current output for LED lighting applications.

Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below.

The LED current (CC control) can be adjusted externally by the resistor Rs at CS pin.

OB3600 offers a dimmable function, the LED current can be controlled by setting the duty cycle of PWM waveform into the DC pin.

OB3600 offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD OVP and UVLO. Excellent EMI performance is achieved with On-Bright proprietary frequency shuffling technique.

OB3600 is offered in SOP8 package.

Fig.1. Typical CC/CV Curve

FEATURES

High Precise Constant Current Regulation at Universal AC input

Dimmable LED Current Control

Quasi-Resonant operation

Adjustable Constant Current, Constant Voltage

Built-in Primary winding inductance compensation

LED short circuit protection

Built-in Leading Edge Blanking (LEB)

Cycle-by-Cycle Current Limiting

VDD Under Voltage Lockout with Hysteresis (UVLO)

Latched over temperature protection (OTP)

VDD OVP

APPLICATIONS

Dimmable LED lighting

TYPICAL APPLICATION