OB3379

GENERAL DESCRIPTION

The OB3379 is a high efficiency LED driver designed for white LEDS lighting and backlight. OB3379 is built-in a quasi-resonant control method buck DC/DC converter. The controller implements a peak current mode control scheme and an internal transconductance amplifier to accurately control the output current over a wide input and load conditions. The transconductance amplifier reference is set by internal reference voltage which determined by the input of ADIM pin and the duty cycle at HPWM pin.

OB3379 offers comprehensive protection features to protect the system in various fault conditions such as Diode & Inductor short protection, CS open protection, LED+/LED- short protection, LED open loop protection, Over temperature protection (OTP). The cycle-by-cycle current limit function limits the maximum current flowing through the external MOSFET.

OB3379 is offered in SOP8 package.

FEATURES

n Low system cost and high efficiency

n Quasi-Resonant buck topology operation

n Programmable CC regulation

n 1%-100% Analog and PWM to analog combination dimming

n Zero voltage signal detected to improve efficiency and EMI performance

n LED+/LED- short circuit protection

n LED open loop protection

n Cycle-by-cycle current limiting

n Built-in leading edge blanking (LEB)

n VIN under voltage lockout with hysteresis

n Over temperature protection (OTP)

n Diode & Inductor short protection

n CS open protection

n Low standby current

APPLICATIONS

n LED lighting

n LED backlight

OB3379

GENERAL DESCRIPTION

FEATURES

APPLICATIONS

TYPICAL APPLICATION