NCP3065SOBSTGEVB: 350mA @ 34V Max, 6 ~ 22V in

Summary

Simple Boost 350 mA LED driver.

The NCP3065 boost converter is configured as a LED driver is shown in Figure 22. It is well suited to automotive or industrial applications where limited board space and a high voltage and high ambient temperature range might be found. The NCP3065 also incorporates safety features such as peak switch current and thermal shutdown protection. The schematic has an external high side current sense resistor that is used to detect if the peak current is exceeded.

In the constant current configuration, protection is also required in the event of an open LED fault since current will continue to charge the output capacitor causing the output voltage to rise. An external zener diode is used to clamp the output voltage in this fault mode. Although the NCP3065 is designed to operate up to 40 V additional input transient protections might be required in certain automotive applications due to inductive load dump.

Specifications

Manufacturer	onsemi
Category	Lighting
Sub-Category	LED Drivers - DC In
Eval Board Part Number	NCP3065SOBSTGEVBOS-ND
Eval Board Supplier	onsemi
Eval Board	Board not Stocked
Voltage In	6 ~ 22 V
Topology	Step Up
Current Out	350 mA
Voltage Out (Max)	32 V
Outputs and Type	1 Non-Isolated
Efficiency @ Conditions	>88%, 12V in, 4 LEDs @ 350 mA >87%, 12 ~ 21.5V in, 6 LEDs @ 350 mA
Features	Current Limit (Adj. or Fixed) Open Circuit Protection Thermal Protection
Switching Frequency	180 kHz
Component Count + Extras	15 + 7
Design Author	ONSemiconductor
Application / Target Market	Automotive Lighting: LED Home Lighting Lighting: LED Signage
Main I.C. Base Part	NCP3065
Date Created By Author
Date Added To Library	2011-10