【Foreword】
We would like to thank eeworld forum and Digi-Key Electronics for providing this trial and evaluation activity of the ADI DC1729A linear regulator evaluation board.
For this event, you need to place an order from Digi-Key Electronics yourself. It took 7 days from placing the order to receiving the goods. Since it was shipped from the United States, this was considered a relatively fast time.
[Unboxing]
The express box is a very large package, and after opening it, there is a beautiful packaging box:
After opening it, it is wrapped in black sponge, and inside it is an exquisite evaluation board in anti-static packaging:
Unpack the package and see the evaluation board:
back:
The workmanship is very solid.
【Information Sharing】
The event provided a simple data sheet. Through the Chinese search, the information found was very limited. After several twists and turns, I found a relatively comprehensive data sheet, a total of 34 pages, with a very detailed introduction. Share it as follows:
【Basic information of the module】
The main control chip of this development board is LT2321 3086, 16-pin package.
The LT3086 is a versatile, low dropout, low noise 2.1A linear regulator that operates from an input supply range of 1.4V to 40V. The dropout voltage is typically 330mV at 2.1A. A resistor sets the output voltage from 0.4V to 32V. The output voltage tolerance is guaranteed to be ±2% over line, load and temperature. The LT3086 is stable with ceramic output capacitors (minimum value required is 10μF).
The LT3086's programmable cable drop compensation eliminates output voltage errors caused by resistive connections to the load. A master/slave configuration allows multiple devices to be paralleled for higher load current and heat dissipation without the need for external ballast resistors.
Output current and temperature monitoring and a power good flag provide system diagnostic and debug capabilities. Internal fault protection circuitry includes thermal shutdown and current limiting with foldback. In addition, thermal and current limits can be set externally.
The LT3086 is available in the thermally enhanced 16-lead (5mm × 4mm) DFN, 16-lead TSSOP, 7-lead DD-PAK and 7-lead TO-220 packages.
Its specific characteristics and applications are shown in the following table.
[Development board schematic diagram]
As can be seen from the schematic diagram, the voltage output of 1V, 1.2V, 1.5V, 3.3V, and 5V can be selected through the jumpers on the evaluation board. The voltage can also be calculated by the user and the specified resistor can be connected to output a voltage output of 0.4V to 32V. The calculation formula can be found in the manual: RSET = (VOUT – 0.4V)/50A
[Schematic diagram of the chip’s internal structure]
From the internal schematic diagram, we can roughly understand the working principle of this chip. The circuit is composed of a series of operational amplifiers. Through simple peripheral resistors, it generates a small current change to output the voltage and current required by the user. At the same time, through the cooperation of PWRGD and RPWRGD, users can customize the comprehensive protection of current.
In addition, as can be seen from the schematic diagram, it has a TEMP operational amplifier, which operates through a 100uA current to generate a 10mV/degree voltage for the external circuit to monitor the operating temperature of the chip. Typically, when the chip is 25 degrees, the voltage is 250mV.
At the same time, there is a SHDN pin, which uses a 1.22V comparator. If the user inputs a voltage lower than 1.22V, the chip can be turned off to achieve ultra-low power consumption mode.
【Typical Circuit】
The manual provides some typical application circuits of this power chip:
The RSET resistance value in the table above is consistent with the schematic diagram of the evaluation board.
This concludes the unboxing static analysis. In short, this chip is an excellent power supply evaluation board.
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