FAQs

Solution: When strong interference sources such as motors and circuit breakers are present at the front end of the module, the interference is equivalent to the Electrical Fast Transient/Burst (EFT) interference defined in EMC standards. In severe cases, this can cause the customer’s system processor to reset or hang. It is recommended to install an EMC filter at the front end of the module.

Cause: The maximum startup current limit of the intrinsically safe power supply is insufficient to meet the module’s startup power requirements (as the module requires significant power during startup).

Solution: Select our products with lower startup current requirements, or connect a small resistor or inductor in series at the module’s input to reduce the startup current.

Answer: Certain first-generation constant-voltage products feature continuous short-circuit protection and auto-recovery functions, such as the IF-RN/T and BLS-1WR. The second-generation products have comprehensively improved performance and include short-circuit protection. Please refer to the technical manual for specific details.

Cause: After ruling out product defects and improper usage by the customer, the most probable cause of the interference is an overlap in the frequency bands between the product’s operating frequency and that of the system chip.

Solution: It is recommended to avoid this frequency overlap. Please contact sales personnel to assist with re-selection. We suggest using Jing森 (JS) circuit products (Standard voltage products operate at 45kHz-180kHz, while JS circuit products operate at 200kHz-400kHz; models have the suffix “JS”).

Answer: Crosstalk is a common issue when switch-mode power supplies (SMPS) are connected in series, particularly when multiple power supplies are connected in parallel. The general solution is to add filter circuits to both the input and output. You can add common mode chokes and X capacitors to the input side, and implement Pi-filtering on the output side.

Cause: To reduce standby power consumption and improve light-load efficiency, AC-DC products operate in Burst Mode (or skip-cycle mode) under light load conditions. While this results in relatively higher ripple, the output voltage remains stable.

Solution: High ripple under light load (below 10%) is a normal phenomenon. To avoid this situation, it is recommended that the customer ensures the load is not lower than 10% during operation.

Cause: To improve efficiency and reduce standby power consumption at low power levels, AC-DC products operate in Burst Mode (skip-cycle mode) under light load conditions. In this state, the product operates in a variable frequency mode (normal operating frequency is 65kHz or 100kHz). While the output voltage fluctuation and ripple are relatively high, the output voltage remains stable.

Solution: High ripple under light load (below 10%) is a normal phenomenon. To avoid this situation, it is recommended that the customer ensures the load is not lower than 10% during operation.

DANGER: HIGH VOLTAGE! Take necessary precautions!

• Production and debugging personnel must be trained before operating.
• Dangerous high voltage exists on the AC input side. Do not touch.
• Ensure high voltage protection during production and debugging!
• Display high voltage warning signs at the production and debugging sites!
• Beware of residual high voltage in external capacitors after power-off!