6.3 Recommended Operating Conditions–40°C ≤ TA ≤ 125°C (unless otherwise noted)
||Supply current (the device sinks additional current when VIN> VZENER(1))
||Voltage at the VIN pin(2)(3) (see Detailed Description)
||Voltage directly from the supply before clamped by the Zener diode
||Input capacitor between VIN and GND(4)
||Operating ambient temperature
The device regulates the supply with an internal Zener diode. The device sinks up to 3 mA with the added supply current. See Equation 5
to find appropriate value for the RS
The maximum input voltage of the device depends on the clamping voltage of the internal Zener diode, which changes over temperature. A current-limiting resistor is required to limit current to the Zener diode if the input voltage (VIN
) is greater than VZENER
. For more information on resistor sizing see the Detailed Description
section and Application and Implementation
(3) For VS voltages less than VZENER, VIN = VS. For VS voltages greater than VZENER, VIN = VZENER.
(4) 4.7-µF input capacitor and full wave rectified 230-Vrms AC supply results in approximately 500-mV supply ripple.