ZXRE330ESA-7 datasheet(5/8 Pages) DIODES

5 / 8 page

ZXRE330

Document number: DS36772 Rev. 2 - 2

5 of 8

www.diodes.com

January 2014

ZXRE330

Start Up Characteristics ZXRE330

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

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 is at its minimum, RS should be large enough so that the current flowing through the ZXRE330 is less than 10 mA.

RS is determined by the supply voltage, (VS), the load and operating current, (IL and IR), and the ZXRE330’s reverse

breakdown voltage, VR.

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Printed circuit board layout considerations

ZXRE330 in the SOT23 package have the die attached to pin 1, which results in an electrical contact between pin 2 and

pin 3. Therefore, pin 1 of the SOT23 package must be left floating or connected to pin 2.

ZXRE330 in the TO92 package have 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.

IR +

Input

Output

Input

Output

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