DC2339A Step-Down (Buck) LED Drivers by Analog Devices

Step-Down (Buck) LED Drivers
Status: Production
Series: LT3744
RoHS: Compliant
Download Datasheet Visit Manufacturer Site View Pricing & Stock
The LT3744 is a fixed frequency synchronous step-down DC/DC controller designed to drive a LED load at up to 20A continuous or 40A pulsed. The peak current mode controller will maintain ±3% LED current regulation over a wide output voltage range, from VEE to VIN. By allowing VEE to float to negative voltages, several LEDs in series can be driven from a single Li-Ion battery with a simple, single step-down output stage. PWM dimming is achieved with the PWM pins. The regulated LED current is set with analog voltages at the CTRL pins. Regulated voltage and overvoltage protection are set with a voltage divider from the output to the FB pin. The switching frequency is programmable from 100kHz to 1MHz through an external resistor on the RT pin.Additional features include an accurate external reference voltage, a control input for thermally derating regulation current, an accurate EN/UVLO pin, an open-drain output fault flag, OVLO, frequency synchronization, and thermal shutdown.

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Alternative Descriptions

LT3744A Demo Board - Triple LE | Analog Devices
Demonstration Board, Led Driver | Newark Electronics
DEMONSTRATION BOARD, LED DRIVER | element14
SEMICONDUCTOR DESIGNER KIT | Richardson RFPD

DC2339A Development Boards & Evaluation Kits by Linear Technology

DEMO BOARD LT3744 SYNC BUCK LED DRIVER

Education Maker & Hobbyist Electronics>Development Boards & Evaluation Kits>Lighting Development Kits
Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock
Demonstration circuit 2339A is a high current synchronous step-down LED driver featuring the LT®3744. The unique drive stage used on the LT3744 allows the anodes of three LEDs to be connected together for better heat sinking. This connection will work in both the step-down configuration and the inverting buck-boost configuration. The pros and cons of each configuration can be found in the data sheet. This demonstration circuit 2339A is for customers to test the step-down configuration only. The inverting buck-boost configuration is shown in a separate demonstration circuit. The input of the demo board is up to 36V. The components are optimized for the efficiency, thermal and PWM dimming for a 12V input. Each of the three outputs is up to 5V, 20A with a 6.05V maximum output voltage limit. The PWM1, PWM2 and PWM3 pins are set to low by default. A DC or PWM signal is required to connect to at least one of the PWM pins to enable the circuit. At any giving time, output current only passes through one LED determined by settings of PWM pins. The CTRL1, CTRL2 and CTRL3 pins can be adjusted to provide accurate analog dimming down to 20:1 ratio. The minimal input voltage for the LT3744 to operate is 3.3V. However, to maintain the output current regulation in a step down regulator, the minimum input voltage is determined by the LED voltage and the maximum duty cycle. For a 5V output, the demo board minimum input voltage will be around 5.5V at room temperature. The load to be used with this demo board is high current LEDs or laser diodes. Smaller LEDs may not be able to handle the high current, even for a short period of time. It is necessary to mount the LED load on a proper heat sink. A fan may become necessary to avoid exceeding LED’s maximum temperate rating. The typical efficiency of the demo board is 93.5% from a 12V input to 5V, 20A load. The lower the input voltage, the higher the efficiency tends to be for a given load. At output power level of 100W, even one percent of efficiency improvement is a big advantage in minimizing temperature rise. If an efficiency measurement is needed in an application, the output voltage must be measured at the output capacitors instead of the LED load. This prevents cable loss from being counted as a loss of the board. The demo circuit DC2399A achieves fast current rise time from 0A to 20A in 5µs. To see the real rise time, connecting wires between the LED and the board should be as short as possible to minimize the wire inductance and resistance. It is recommended to measure the voltage across R32 with a short 50Ω coax cable directly into a BNC connector on the oscilloscope. The current can be calculated from the measured voltage. Figure 1 shows the current rise time. A current probe adds more delays to the rise time so using a current probe is not recommended unless rise time is not a concern. The LT3744 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with this quick start guide for demo circuit 2339A.

Features

Specifications

Device Topology Synchronous Buck (Step Down)
No. of Outputs 3Outputs
Output Current 20A
Output Voltage 6.05V
Input Voltage Min 5.5V
Input Voltage Max 36V
Core Chip LT3744
Dimming Control Type Analogue PWM
Kit Contents Demo Board LT3744
Product Range -
SVHC No SVHC (15-Jan-2018)

Frequently Asked Questions

Where can I find additional details, specifications and documents for a DC2339A?

Additional datasheets, footprints and schematics for DC2339A are listed on our Part Details page. You can also find images and similar parts to DC2339A on this page.

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What category does DC2339A fall under?

The DC2339A is listed under Step-Down (Buck) LED Drivers.

Can I view similar or alternative parts?

You can view similar parts to DC2339A when available in the Step-Down (Buck) LED Drivers range under the specifications section at the bottom of the details page.

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Submit any questions directly to the customer support team of the distributor listing the product. For the DC2339A you can contact the distributor directly for product support, shipping queries etc.

Is the DC2339A RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Analog Devices.

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