LTC3212EDDB

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The LTC3212EDDB is a low-cost, externally-compensated COT flyback controller suitable for driving LEDs. This device starts up within 150 microseconds after the input voltage is applied, and can dim LEDs quickly, accurately, and smoothly. It is designed to allow easy, low-cost dimming of a single LED string, small clusters, or other power LEDs that require current control.

The LTC3212EDDB is designed to provide high accuracy current control for LED drivers. It uses an external compensation network to achieve accurate LED current dimming from 0% to 100% without transitions when dimming. An internal voltage regulator allows the design of a single-ended flyback LED driver that does not require an opto-coupler for regulation. External components are minimized, significantly reducing bill-of-materials cost.

The LTC3212EDDB application span across industrial, automotive and consumer markets, all of which demand high power efficiency, low environmental impact and small size. It is increasingly used for powering LED lighting solutions, for applications such as automotive front and rear head lights, interior LED lighting, LED accent lighting, LED display, LED signage and LED lighting.

The working principle of the LTC3212EDDB is based on the classic simple flyback controller. It has an internal level shift which allows the device to directly access the drain of the low-side external switch MOSFET. The controller begins operating once VIN has been applied. The inductance of the transformer eventually reaches its saturation point, causing a. The voltage across the output freewheeling diode causes current to flow in the output capacitance. This current charge is maintained until M1 is turned on, at which point the output voltage rises and limits the current to the set level.

The output current is limited by the current sense resistor RCS. The internal comparator monitors the voltage drop across RCS and compares it to a reference voltage generated by the internal voltage regulator. When the voltage across RCS increases above the programmed reference voltage, the controller will turn off M1, stopping the output current flow. When M1 is off, the output voltage will start to decrease by the voltage across the inductance.

The LTC3212EDDB also features precision current regulation and low current consumption. The device features a current regulation accuracy of +/- 0.2%. It also utilizes a low current consumption during operation, with current consumption as low as 1.2 mA when operating. This makes the LTC3212EDDB an ideal choice for applications where low power consumption is critical.

In conclusion, the LTC3212EDDB is an excellent choice for LED driver applications. Its fast startup, accurate dimming, wide application scope, and low current consumption make it an ideal choice for a variety of LED lighting solutions. The low cost and small size of the LTC3212EDDB make it an attractive solution for many LED applications.

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