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DC1831A: 10A @ 15V Max, 12 ~ 60V in

Summary

Demonstration circuit 1831A is a high power constant current, constant voltage synchronous buck controller featuring the LT®3763. The input of the demo board is up to 60V. The output is optimized for 10V, 10A as a LED driver. As an LED driver, the output current is being regulated until the output voltage reaches a programmed voltage limit. The voltage limit on the demo board is set to around 15V by R11 and R14. 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 temperature rating.

The input voltage range of the LT3763 itself is 6V to 60V. The demo board input range is 12V to 60V, therefore, the demo board utilizes 80V MOSFETs. If an application has a maximum input voltage of 48V, 60V MOSFETs such as BSC100N06LS3, can be used for better efficiency at lower voltage range. The typical efficiency of the demo board is 95% from a 24V input to a 10V, 10A load. The lower the input voltage, the higher the efficiency tends to be for a given load. At an output power level of 100W, even a one percent 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 at the LED load. This prevents cable loss from being counted as a loss of the board. The LT3763 turns off unnecessary circuits during PWM off period to minimize power losses. As a result, efficiency in many PWM dimming applications is high.

Specifications

Manufacturer Linear Technology/Analog Devices
Category Lighting
Sub-Category LED Drivers - DC In
Eval Board Part Number DC1831A-ND
Eval Board Supplier Linear Technology/Analog Devices
Eval Board Normally In Stock
Voltage In 12 ~ 60 V
Topology Step Down
Current Out 10 A
Voltage Out (Max) 15 V
Outputs and Type 1 Non-Isolated
Efficiency @ Conditions >93%, 12 ~ 48V in, @ 10 A (LED load)
>92%, 12 ~ 56V in, @ 5 A (LED load)
Features Current Limit (Adj. or Fixed)
Fault Indication
Over Current Protection
Over Voltage Protection
PWM Interface
Shutdown, Enable, Standby
Synchronizable
Thermal Protection
Under Voltage Protection, Brown-Out
Voltage Reference
Switching Frequency 200 kHz ~ 1 MHz
Component Count + Extras 38 + 29
Design Author Linear Technology
Application / Target Market Automotive
LED Commercial Lighting
LED Solar Streetlight
Main I.C. Base Part LT3763
Date Created By Author 2012-10
Date Added To Library 2014-09

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