Product description: Atnel ATB-PWR-3 - 5V 1A step-down converter
Step-up/step-downconverter with 5 V or 3.3 V output voltage. Maximum current 1 A. Power supply in range from 8 V to 45 V.
Technical specifications of the converter
- Input voltage: 8 V to 45 V
- Output voltage: 3.3 V or 5 V
- Operating frequency: 44.6 MHz
- Maximum output current: 1 A
- Small dimensions:
- 25.5 x 14.7 x 19 mm - with connectors
- 25.5 x 14.7 x 16.5 mm - without connectors
Main features of the converter
- The output voltage can be higher, lower or equal to the supply voltage (in the range from 8 V to 45 V).
- The continuous output current is maximum 1 A - depends on the input voltage.
- Output voltage 3.3 V or 5 V.
- Small dimensions: 25.5 x 14.7 x 19 mm - with connectors.
Atnel ATB-PWR-3 step-down converter
High efficiency avoids high temperatures during operation, as is the case with 7805 regulators. The latest generation ATB-PWR-3 step-down converters are equipped with a logic circuit to control its operation (on/off) even from the microcontroller level. Output voltage is selected by a jumper. When the default is open, the output voltage is +5V. When the jumper is closed, the output voltage is +3.3V. In addition, the inverters are equipped with a built-in micro-switch SMD key, which allows convenient switching on the power manually at any convenient time by the user. SMD jumpers on the inverter allow reconfiguration of its simple logic functions. The heart of the module is the A8498 IC, with a rated current capacity of 3A! So the circuit has a considerable reserve.
Comparison of power quality parameters (ripple) between a standard 7805 linear regulator and the ATB-PWR3 converter, at 500 mA current consumption. The measurements were made with a RIGOL DS4024 digital oscilloscope (200MHz).
Operation modes of the converter
1. operation mode 7805
To get the functionality of the converter as in popular linear regulator 7805 (no control logic at all) it is enough to short the SMD jumper JP2 with a drop of tin. At this point, all logic is disabled. After connecting power supply voltage to the converter input, it switches on immediately and outputs one of two voltages selected by JP1 jumper. By default it is open (jumper removed), so the output is +5V. If you don't want to use logic in the converter at all, you can desolder both pairs of goldpins JP2 and JP3. 2.
2. operation mode with power switch (preset/default)
This mode provides the ability to switch on the circuit powered by the inverter using a switch. For this purpose, two pins can be taken out from the bottom of the inverter at jumper JP2. You can use pair of wires to lead the switch out of the device casing. If you don't need it, you can also use (in parallel) a built-in micro switch, located on the converter. This is a very convenient option when prototyping your own devices even on contact boards. After connecting the input voltage, you always have some time for a final visual check, if by any chance there is a short somewhere in the circuit. After that it's enough to click the micro switch to start the prototype.
3. working mode with power switch and PWR DOWN pin
The mode described in point 2 can be enriched with the functionality, which allows you to control the power supply by for example the microcontroller, which works in it. Thanks to this, the device, after being manually switched on by the operator, can perform the set work, even a long one, which can already take place without human supervision. However, after it is finished, the microcontroller (program) can turn off the power, which significantly reduces current consumption by the whole device. Where it can be used. Such solutions are successfully used in devices operating in cars or public transport buses, when the controller equipped with such an inverter operates on the basis of battery power and the primary goal is to minimize current consumption.
Instruction / outputs
The inverter has an input voltage from 8 V to 45 V and an output voltage from 3.3 V to 5 V.
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