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  • The output voltage drops when a load is connected.
    • Possible causes and recommended corrective actions are as follows.
      Cause: The output oscillates.
      Action: Verify the connection of the capacitor between the input and output.
      Cause: The current flowing exceeds the peak output current.
      Action: Lower the input voltage, which effectively decreases heat and, as a result, the chip temperature.
      *Please note that a relatively high current is necessary in order to start up the regulator when a motor or lamp is connected as the load.
      Cause: The chip temperature exceeds 150ºC.
      Action: Lower the chip temperature, which effectively decreases heat and, as a result, the chip temperature.
      Cause: The input and output are connected in reverse.
      Action: Check the pin connections.
    • Products: Standard Voltage Regulators  
  • What kind of capacitor should I use as an external capacitor?
    • Any capacitor can be used, provided it possesses good temperature and frequency characteristics.

      1. Many electrolytic capacitors feature decreased capacitance at low temperatures (0ºC). Please ensure that the capacitance is guaranteed under the operating temperatures in question.
      2. Normally, the capacitance of electrolytic capacitors is measured at low frequencies, oftentimes as low as 100 to 120Hz. High frequency operation may cause substantial drops in capacitance. Please verify the frequency characteristics of the capacitor under actual use.

      Care must be taken when using electrolytics in particular and ceramic capacitors to some extent. Tantalum and film capacitors are largely stable. Therefore, ROHM recommends tantalum capacitors for use as external capacitors.
    • Products: Standard Voltage Regulators  
Showing 1 - 10 of 13 results.
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