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AN103 - The FET Constant-Current Source/Limiter

Key Features

  • guaranteed peak operating voltage minimum of 100 V with a typical of 180 V. The J500 series features 50 V minimum with a typical of 100 V. The lower current devices in both series provide excellent current regulation down to as little as 1 V. Siliconix 10-Mar-97 Bias Resistor Selection All industry JFET part types exhibit a significant variation in IDSS and VGS(off) on min/max specifications and device-to-device variations. Using the simple source biasing current source as illustrated in Figure.

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Datasheet Details

Part number AN103
Manufacturer Siliconix
File Size 76.04 KB
Description The FET Constant-Current Source/Limiter
Datasheet download datasheet AN103 Datasheet

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www.DataSheet4U.com AN103 The FET Constant-Current Source/Limiter Introduction The combination of low associated operating voltage and high output impedance makes the FET attractive as a constant-current source. An adjustable-current source (Figure 1) may be built with a FET, a variable resistor, and a small battery. For optimum thermal stability, the FET should be biased near the zero temperature coefficient point. D S RL RS – + A change in supply voltage or a change in load impedance, will change ID by only a small factor because of the low output conductance goss. DID = (DVDS)(goss) (3) The value of goss is an important consideration in the accuracy of a constant-current source where the supply voltage may vary.