Datasheet ZXRE330 (Diodes) - 5

ZXRE330 Startup Characteristics ZXRE330
Input Input Output Output IR = 100μA, No Load Capacitor IR = 5mA, No Load Capacitor
Application Information
In a conventional shunt regulator application (Figure 1), an external series resistor (RS) is connected between the supply voltage, VS, and the ZXRE330. RS determines the current that flows through the load (IL) and the ZXRE330 (IR). Since load current and supply voltage VS may vary, RS should be small enough to supply at least the minimum acceptable IR to the ZXRE330 even when the supply voltage is at its minimum and the load current is at its maximum value. When the supply voltage is at its maximum and IL IR + is at its minimum, RS should be large enough so that the current flowing through the ZXRE330 is less than 10mA. IL RS RS is determined by the supply voltage, (VS), the load and operating current, (IL and IR), and the ZXRE330’s reverse IL breakdown voltage, VR. VR  S V R V R  S I  R L I R I
Printed Circuit Board Layout Considerations
ZXRE330 in the SOT23 package has the die attached to pin 3, which results in an electrical contact between pin 2 and pin 3. Therefore, pin 3 of the SOT23 package must be left floating or connected to pin 2.
Figure 1
ZXRE330 in the TO92 package has the die attached to pin 2, which results in an electrical contact between pin 2 and pin 1. Therefore, pin 2 must be left floating or connected to pin1. ZXRE330 5 of 9 September 2023 Document number: DS36772 Rev 4 - 2
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