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Green circuit board with LCD screen, knobs, and screw terminals

Ruth's sister

Ruth's sister XY-SJVA-4X 0.5-30V 4A LCD boost buck module internal power cable

SKU CH-KBRK-JFW9A

Adjustable DC boost-buck module with LCD display, 0.5-30 V output and 0-4 A constant-current limit for lithium charging

  • LCD shows input voltage, output voltage, current and power
  • Reverse-connection protection on the input prevents damage from wrong polarity
  • Adjustable output from .5 V to 30 V with current limit up to 4 A
  • Output anti-backflow design removes the need for an external diode when charging
  • Press-button output control with selectable power-on default state

Purpose & Audience

This is a DC boost-buck module with an integrated LCD that shows input voltage, output voltage, output current and output power. It accepts an input range that allows the output to be set anywhere from 0.5 V to 30 V with a current limit adjustable up to 4 A, making it suitable for hobbyists building adjustable bench supplies or lithium charging circuits.

Fit & Alternatives

The module suits builders who need a single compact board that can both step up and step down voltage while providing constant-current and constant-voltage regulation with reverse-input protection. It is not for buyers who require a higher current limit than 4 A, need an isolated topology, or want a fully enclosed power supply with mains input and safety certifications.

Extras & Impact

The on-board LCD removes the need for external meters during setup and monitoring. Reverse-connection protection at the input prevents damage from wiring mistakes, while output anti-backflow eliminates the need for an external blocking diode when charging batteries. A push-button toggles the output state and the default power-on behaviour can be configured, simplifying integration into automated test rigs.

Highlights

  • LCD shows input voltage, output voltage, current and power
  • Reverse-connection protection on the input prevents damage from wrong polarity
  • Adjustable output from .5 V to 30 V with current limit up to 4 A
  • Output anti-backflow design removes the need for an external diode when charging
  • Press-button output control with selectable power-on default state

Specifications

No published specifications for this item yet.

Questions about this item

What input voltage range must my power supply provide for the XY-SJVA-4X module to operate?

The module accepts an input up to 60 V, so your power supply must stay within that limit while delivering the required current.

Will the module's anti-backflow output protect a battery I already use when the input is disconnected?

Yes, the output is anti-backflow, so no external diode is needed and the battery will not discharge back into the module.

How can I confirm the module is regulating correctly after I connect it?

The onboard LCD shows input voltage, output voltage, output current and output power in real time.

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