YF-BKT050V15A 0.5-15A/3-52V Automatic Step up down Converter Buck Boost Converter Power Supply Board

YF-BKT050V15A 0.5-15A/3-52V Automatic Step up down Converter Buck Boost Converter Power Supply Board

Read before purchasing:
- Do not use a 3A/5A regulated DC power supply as an input to test the power supply.
- Basic technical knowledge and hands-on ability are highly recommended.
- Users need to modify parameters such as undervoltage protection parameters. We can tell you how to modify it.
- The power supply is very stable and can be used for 5000h on the average without failure. Factors, such as reverse connection, water ingress, corrosion, over-voltage, over-temperature and control modification errors will get it damaged.
- Certain power supply test and measurement capabilities and equipment are recommended. Do not test this power supply with a 3A adjustable regulated power supply used in labs.
- Do not test the current-limiting power supply in CC mode of an electronic load.
- Output current adjustment range: If the input power is sufficient, and the output power supply is 20V and a 0.4Ω resistor is connected to adjust CC potentiometer, the output current can be adjusted to a maximum of 20A, but cannot be adjusted to the minimum limit value (except 0A).

Features:
- Ultra-cost-effective buck-boost power supply
- Stable performance, high efficiency and small size
- Designed with aluminum substrate

Package Included:
- 1 x Power supply board

Note:
- Battery is not included.

Typical Performance:
- Non-isolated four-switch synchronous buck-boost
- Wide input DC10-52V, output DC3-50V
- Peak efficiency >98.5%
- Input over-voltage, output short-circuit protection self-recovery
- Reverse protection (input fuse)
- Over-temperature protection, remote ON/OFF
- Input and output current signal interface
- Output voltage, current control interface
- Accurate and stable output current regulation
- Battery charge back-charge protection to 53V
- Super capacitor 0V voltage constant current charging
- With load indicator light, shutdown input and output are completely disconnected
- Low quiescent current, fast dynamic response, and power can be over 500W (input and output> 36V)
- Aluminum substrate, high thermal conductivity, 90°C normal operation
- All tests are made at 24V input voltage, resistive load, and 25°C room temperature. Parameters are subject to change without notice



Attention:
1: Please calculate whether the maximum load is suitable according to Iout=VIN*Iin*(0.92-0.98)/Vout. The parameter range should be within the value of the table. Iin (max) = 20A is suitable for all parameter calculations. For example, Vin=12V, Vout=24V, Iout=10A. Vin=48V, Vout=24V, then Iout can be more than 15A.
2: The ripple current of the boost output capacitor is large, and the ripple current of the step-down input capacitor is large, which reduces the capacitor heating and prolongs the life. Electrolytic capacitors can be connected in parallel.
3: Can be directly connected to battery for charging. It is recommended to adjust the output voltage correctly before connecting the target battery.
4: The slow startup time and EN enable together to control the delay time. When the start-up time of the input source is long, you need to adjust the slow startup time of the output. For example, the AC adaptation output full-load voltage settling time is 50ms, while the power supply startup time is 2ms, which may cause AC to fail to start properly with load.
5: Users with dynamic response requirements can optimize specifically. For example, the output is connected to sensitive devices such as a host computer.
6: Some parameters may be adjusted for different applications.

Attention:
1: When testing this power supply, it must be ensured that the input source can provide a large enough current (>25A) to ensure that the power supply does not collapse or even be damaged, especially when starting with load. When the live test is performed, the negative electrode is connected first, and then connect the positive electrode. When shutting down, disconnect the positive terminal first.
2: The startup time of the input source must be less than the startup time of this power supply (e.g. adapter as input), otherwise it may not be possible to start with load.
3: The input wire connected to this power supply shall not be too long (the internal resistance of the wire shall not be too large), otherwise the power supply may cause oscillation and abnormality.
4: If there is a diode in series with the input source to this power supply, the power supply may be damaged by the surge voltage caused by instantaneous on-off (line BOOST effect).
5: Do not use the CC mode of an electronic load as the load of this power supply. It is recommended to use the CR mode. CC mode draws current, this power supply is current limited, and in constant current mode, this will cause the power supply to crash.
6: It is recommended to connect adjustable output voltage with a resistive load (dummy load) with small current, to ensure the real-time adjustment of output voltage potentiometer. Otherwise, the output voltage will change slowly and the regulation will be inaccurate.



Modify input undervoltage protection value:
The default undervoltage protection value is V=(R1/R2+1)*1.2=9.0V (R1=130K, R2=20K). By modifying the two resistor values, you can modify the input undervoltage protection value. Note: Undervoltage protection must have a hysteresis range, which cannot be changed. The input current and the diameter of the wire affect the protection value. It is recommended to set the value a little lower.

Voltage and Current Control:
1: Voltage control Vo=52.8-21.5*Vx. Vx is the voltage of the external control signal (0-2.4V), and the voltage control signal must not have step change, otherwise it may cause permanent damage to the board.

2: Current control: Iout=Vi/0.06. Vi is the external control signal voltage (0-1.2V). For example, if the no-load signal is 0.6V, the output current is limited to 10A ± 0.3A. It is recommended to correct the scale.

If the load capacity of the control signal is not enough, R3 can be removed. R6 can be completely externally controlled. Without giving a control signal, there will be no output. If the ratio cannot reach 0-1.2V, R3 and R6 can be removed.

R5 and R4 are divided by voltage, for example, R5=80K, R4=20K, then the control signal becomes 0-6V corresponding to controlling output current of 0-20A (amplified by 5 times)

Attention: Step change is not allowed for the control signal, otherwise it may cause permanent damage to the board.


The above efficiency data is the actual test value, and the efficiency range is 94.2-98.8%. You can refer to the above data to estimate the efficiency of your own application parameters.