TL4050 datasheet(17/35 Pages) TI

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Cathode and Load Currents

* VZ

) IZ)

(1)

TL4050

IZ + IL

TL4050

www.ti.com........................................................................................................................................................ SLOS486A – JUNE 2007 – REVISED AUGUST 2009

In a typical shunt-regulator configuration (see Figure 3), an external resistor, RS, is connected between the

supply and the cathode of the TL4050. RS must be set properly, as it sets the total current available to supply the

load (IL) and bias the TL4050 (IZ). In all cases, IZ must stay within a specified range for proper operation of the

reference. Taking into consideration one extreme in the variation of the load and supply voltage (maximum IL and

minimum VS), RS must be small enough to supply the minimum IZ required for operation of the regulator, as

given by data-sheet parameters. At the other extreme, maximum VS and minimum IL, RS must be large enough

to limit IZ to less than its maximum-rated value of 15 mA.

RS is calculated according to Equation 1:

Figure 3. Shunt Regulator

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