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DC/DC converters

Linear Technology offers LT3795 DC/DC converter for driving high-brightness LEDS

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By Linear Technology now part of Analog Devices on 27th September 201315th December 2015

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LT3795 data sheet - .PDF file.

Linear Technology has announced the the LT3795: a 110V, high-side current-sense DC/DC converter designed to regulate a current or voltage to a constant value, that is suitable for driving high-brightness (HB) LEDs.

Its 4.5V to 110V input voltage range makes it appropriate for a wide variety of applications, including automotive, industrial and architectural lighting. The LT3795 uses an external low-side N-channel MOSFET and can drive up to 90V of white LEDs from a nominal 12V input, delivering in excess of 50W.

Spread spectrum frequency modulation reduces EMI emissions, while an internal PMOS switch driver delivers robust short-circuit protection in boost and buck-boost topologies. The LT3795 incorporates a high-side current sense, enabling it to be used in boost, buck, buck-boost or SEPIC topologies.

Additionally it offers current both input and output current limiting and monitoring for added reliability and design flexibility. The LT3795 can deliver efficiencies of more than 94 per cent in boost mode, minimising the need for external heat sinking.

The LT3795 has fixed-frequency, current-mode architecture that offers stable operation over a wide range of supply and output voltages, while robust open- and short-circuit protection maximise overall system reliability, and C/10 detection optimises both battery and SuperCap charging designs.

Key specifications

3000:1 True Color PWM dimming
Wide input voltage range: 4.5V to 110V
Input and output current reporting
PMOS switch driver for PWM and output disconnect
Internal spread spectrum frequency modulation
± 2per cent constant voltage regulation
± 3 per cent constant current regulation: 0V ≤ V_OUT ≤ 110V
Programmable input current limit
CTRL inputs linearly adjust LED current
Adjustable frequency: 100kHz to 1MHz
Programmable open-LED protection with OPENLED flag
Short-circuit protection and SHORTLED flag
Programmable undervoltage lockout with hysteresis
Soft-start with programmable fault restart timer
C/10 detection for battery charging
Available in 28-lead TSSOP package

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More information

Linear Technology now part of Analog Devices

Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges.

Contact Supplier Visit our website 01628 477066

About Analog Devices
Analog Devices (NASDAQ: ADI) is the leading global high-performance analog technology company dedicated to solving the toughest engineering challenges. We enable our customers to interpret the world around us by intelligently bridging the physical and digital with unmatched technologies that sense, measure, power, connect and interpret. Visit http://www.analog.com

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