Onsemi NCP1370

Description

The NCP1370 is a PWM current mode controller targeting isolated flyback and non−isolated constant current topologies. The controlleroperates in a quasi−resonant mode to provide high efficiency. Thanksto a novel control method, the device is able to precisely regulate aconstant LED current from the primary side. This removes the needfor secondary side feedback circuitry, biasing and an opto−coupler.The device is highly integrated with a minimum number of externalcomponents. A robust suite of safety protection is built in to simplifythe design. This device supports analog/digital dimming and bothmodes can be combined to enhance dimming precision. The NCP1370has a programmable peak current limit to optimize designcompatibility over a wide range of applications. The controllerfeatures a standby mode with reduced current consumption.

Features

Quasi−resonant Peak Current−mode Control Operation

• Primary Side Sensing (no opto−coupler needed)
• Wide VCC Range
• Source 300 mA / Sink 500 mA Totem Pole Driver with 12 V GateClamp
• Precise LED Constant Current Regulation ±1% Typical
• Line Feed−forward for Enhanced Regulation Accuracy
• Low LED Current Ripple
• 500 mV ±1.2% Guaranteed Voltage Reference for CurrentRegulation
• Programmable Cycle−by−Cycle Peak Current Limit
• Low VCC(on) Allowing to use a Standby Power Supply to Power theDevice
• Analog or Digital Dimming
• Wide Temperature Range of −40 to + 125°C
• Robust Protection Features♦ LED Open Circuit Protection♦ VCC Over Voltage Protection♦ Secondary Diode Short Protection♦ Output Short Circuit Protection♦ Shorted Current Sense Pin Fault Detection♦ Brown−out♦ VCC Under Voltage Lockout♦ Thermal Shutdown
• Pb−free, Halide−free MSL1 Product

Typical applications

• TV backlight
• Lighting with Auxiliary Power Supply

More information

• Datasheet
• IC product information