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SPX4040 数据表(PDF) 4 Page - Sipex Corporation |
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SPX4040 数据表(HTML) 4 Page - Sipex Corporation |
4 / 9 page 4 Date: 1/19/05 SPX4040 Micropower 2.5V Shunt Voltage Reference © Copyright 2005 Sipex Corporation Figure 10. Off State Leakage IK VOUT GND 250Ω 50Ω VIN fp = 100kHz Figure 8. Test Circuit for Pulse Response T A =25 °C I K =1 to 15mA f Frequency (Hz) 100 10 1.0 0.1 0.01 1K 10K 100K 1M 10M Figure 9. Dynamic Output Impedance T A = 25°C, I K = 1 to 15mA 0.01 0.1 1 10 100 -50 0 50 100 150 TA Ambient Temperature (°C) VKA = 2.5V APPLICATION INFORMATION This device is designed for stable operation and has no need of an external capacitor between pins 4 and 8. The reference remains stable if a bypass capacitor is used. SOT-23 The SPX4040 in the SOT-23 package has a parasitic Schottky diode between pin 3 and pin 1. Pin 1 of SOT-23 must float or be connected to pin 3. Conventional Shunt Regulator In a conventional shunt regulator application (see Figure 11), an external series resistor (R S) is connected between the supply voltage and the SPX4040. R S determines the current that flows through the load (I L) and the reference (IQ). Since load current and supply voltage may vary, R S should be small enough to supply at least the minimum acceptable I Q to the reference 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 I L is at its minimum, R S should be large enough so that the current flowing through the SPX4040 is less than 15mA. R S is determined by the supply voltage (VS), the load and operating current (I L and IQ), reference's reverse breakdown voltage (V R). R S = (VS-VR)/(IL+IQ) TYPICAL PERFORMANCE CHARACTERISTICS |
类似零件编号 - SPX4040_05 |
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类似说明 - SPX4040_05 |
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