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Power by Linear/Analog Devices’ LT3964 is a dual buck (step down) 36 V, 1.6 A LED DC/DC converter. This converter is designed to operate as a constant-current and constant-voltage source. The fixed frequency and peak current mode topology result in stable operation over a wide range of supply and output voltages. The ground referred voltage FB pin serves as the input for several LED protection features and allows the converter to operate as a constant-voltage source. An external resistor sets the maximum output current, and the output current amplifier has a rail-to-rail common mode range. LT3964 uses an I2C interface to communicate with a microcontroller to read LED faults, write PWM and analog dimming registers, and set fault masking. The I2C PWM input provides LED dimming ratios up to 8192:1. The I2C programmable CTRL register sets the gain of the external CTRL pin, and maximum current sense threshold, providing additional analog dimming capability.
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