DC-DC very high efficiency BUCK micro-regulator – with fixed or variable output voltage and current; built-in or external or controllable settings

Input: 8.5 to 55V; output: 4V / 100W to 40V / 400W

This micro buck regulator, ideal for charging various batteries, is housed in an all-aluminum case and molded in a resin that homogenizes its internal temperature and makes it insensitive to humidity (IP67), dust, shocks and vibrations. It delivers:

• an available power of 100W under 4V, up to 400W under 40V
• a current of 25A to 10A, as the output voltage increases from 4V to 40V

To optimize the performances of this micro controller (efficiency up to 98%), please see the table in the PDF technical datasheet; it directly determines the most suitable operating modes:

• output current “Iout max” according to chosen “Vout”
• (extrapolated) knowledge of efficiencies, according to “Iout” and “Vout”

INPUT VOLTAGE Vin : any voltage, from 8.5V to 55V, necessarily a few volts higher than the chosen output

OUTPUT VOLTAGE Vout and possible choices:

• either adjustable from 4 to 40V with inbuilt “10 rounds” trimmer of diameter 3mm
• or controllable by 1V to 10V, from 4V to 40V; ex: 5V → 20V
• or adjustable from 4 to 40V by external resistor of 15kΩ to 80Ω
• or factory-set fixed value, previously chosen

OUTPUT CURRENT Iout:

• 0 to 25A, according to the load and optimizations of the table, for Vout equal to or higher than 3V
• examples of maximum permitted currents for Vout = 24V:
• Iout max = 14A for Vin minimized at 27V; efficiency = 97%
• Iout max = 13A for Vin fixed at 41V; efficiency = 96%
• Iout max = 12A for Vin increased at 55V; efficiency = 95%
• adjustable from 2.5A to 25A with inbuilt trimmer having a “10 rounds” axis of diameter 3mm
• or controllable by 1 to 10V, from 2.5 to 25A; ex: 5V → 12.5A
• or linearly adjustable (1A/Ω) from 2.5 to 25A, with external R of 2.5 to 25Ω
• or factory-set on a fixed value (ex: 14A), for Vout fixed at 24V

NB: stability, at constant current, better than 2%, Vout varying from 3V to Vout max.

ISOLATION : no; -Vin and -Vout terminals are internally connected

LINE and LOAD REGULATIONS: better than 2%

RESIDUAL : < 0.5% of Vout

SWITCHING FREQUENCY : approximately 390kHz

ON / OFF and remote regulation S+ : options

THERMAL CHARACTERISTICS

• thermal resistance of the case: 6°C / W
• maximum case temperature: 100°C
• storage temperature: -50°C to +120°C
• suggested heatsink: black aluminum, 150 x 150 x 2mm (thermal resistance: approximately 2°C / W)

CASE

• all aluminum; 50.5 x 50.5 x 26 mm
• weight: 140g
• fastening: 2 unthreaded through-holes of diameter 4.2mm, and 2 M4 blind-holes on support side, center-to-center distances: 40.5 x 40.5 mm

SCREW TERMINAL BLOCK

• for “power” connections: Phœnix, 4 connections 8mm²
• additive connections: 4 or 5 connections for wires of diameter up to 1.8mm

STANDARDS and SPECIFICATIONS

• CSA / 60950-1 / RoHS
• MTBF > 2.10⁶ hours, at full load, base at 45°C

IMPORTANT: To see the available versions, options, examples, applications (controlled automatism, double safety battery charging, heat treatments with external manual settings), please download the PDF datasheet.