Constant-Current Buck Regulator

This NCL30160 Constant-Current Buck Regulator takes the constant voltage delivered by ON Semiconductor's NCL30051-enabled power supply and steps down the voltage to provide a constant current across the LED string. (View the NCL30051 PFC/Half-Bridge Combo Controller). The NCL30160 Constant-Current Buck Regulator operates with an input voltage range from 6.3V to 40V. The hysteretic control of this ON Semiconductor NCL30160 Constant-Current Buck Regulator gives good power supply rejection and fast response during load transients and PWM dimming to LED arrays of varying number and type. Protection features include resistor-programmed constant LED current, broken/open LED protection, under-voltage and thermal shutdown.

Features Integrated 1.0A MOSFET
VIN Range 6.3 V to 40 V
Short LED Shutdown Protection
Up to 1.4 MHz Switching Frequency
No Control Loop Compensation Required
Adjustable LED Current
Single Pin Brightness and Enable/Disable Control Using PWM
Supports All−Ceramic Output Capacitors and Capacitor−less Outputs
Thermal Shutdown Protection
Capable of 100% Duty Cycle Operation

Applications LED Driver
Constant Current Source
Automotive Lighting
General Illumination
Industrial Lighting

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