DC1102A - LT3476EUHF - LT3003EMSE Evaluation Kit

Features

  • DC1102A - LT3476EUHF - LT300EMSE Evaluation Kit
  • Disclaimer: Linear Technology cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Linear Technology product. No circuit patent licenses are implied. Linear Technology reserves the right to change the circuitry and specifications without notice at any time

Typical Application

DC1102A
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Description

Demonstration circuit 1102 is a Quadruple High Power LED Driver with Ballaster in Buck Mode featuring the LT3476 and LT3003. The demo board steps down PVIN to a proper level in order to generate required current for LED loads. PVIN can be up to 33V. All the four LT3476 channels are independent. Each of the four channels can drive 3 LED strings using one LT3003. The total number of strings the demo circuit can drive is 12. The LT3003 is a three string LED current ballaster. It offers high efficiency and good current matching. VIN is for the LT3476 bias. To reduce power dissipation on the chip, use a low voltage, such as 3.3V, for VIN. The demo circuit operates at 1MHz, offering good balance between small solution size and high efficiency. The number of LEDs the circuit can drive depends on the LED forward voltage and PVIN. At 1MHz, the circuit can drive up to 26V worth of LED string voltage at 1A per channel. If the LED current is low and the LT3476 operates at a low duty cycle, the circuit may skip pulses. Pulse skipping is not harmful in most cases. Populating C14-C17 with 1-10pF capacitors can usually prevent skipping pulses. PWM dimming offers better LED color integrity than the DC dimming. At 100Hz PWM frequency, 1000:1 dimming ratio can be achieved with this demo circuit. Other current levels and/or circuit configurations can be achieved with simple modifications. Please consult the datasheets or the factory for customization details. The LT3476 and the LT3003 datasheets give complete description of the part, operation and application information. The datasheets must be read in conjunction with this quick start guide for working on or modifying the demo circuit 1102.
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Packaging

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Order Info

Evaluation Kits

Part Number Description Price
DC1102A LT3476EUHF/LT3003EMSE $275.00
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Applications

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Simulate

To simulate selected Linear Technology products, please download LTSpice / SwitcherCAD III. This powerful schematic capture and simulation tool includes macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

For other simulation tools, visit our Design Simulation and Device Models page.

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