LT3092MPST#TRPBF【PDF 10/22 页】IC PROG CURRENT SOURCE SOT223-3

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LT3092

3092fb

APPLICATIONS INFORMATION

Figure 3 depicts the simplest frequency compensation

network as a single capacitor connected across the two

terminals of the current source. In this case, either a

capacitor with a value less than 1000pF, or greater than

1糉 (ESR < 0.5?, may stabilize the circuit. Some ap-

plications may use the small value capacitor to stand

off DC voltage, but allow the transfer of data down a

signal line.

For some applications, this capacitance range may be

unacceptable or present a design constraint. One circuit

example typifying this is an intrinsically-safe circuit in

which an overload or fault condition potentially allows

the capacitors stored energy to create a spark or arc.

For applications in which a single capacitor is unacceptable,

Figure 3 alternately shows a series RC network connected

across the two terminals of the current source. This network

has two bene ts. First, it limits the potential discharge

current of the capacitor under a fault condition, preventing

sparks or arcs. Second, it bridges the gap between the

upper bound of 1000pF for small capacitors to the lower

bound of 1糉 for large capacitors such that almost any

value capacitor can be used. This allows the user greater

exibility for frequency compensating the loop and ne

tuning the RC network for complex impedance networks.

In many instances, a series RC network is the best solution

for stabilizing the application circuit. Typical resistor values

will range from 100?to about 5k, especially for capacitor

Figure 4. Input and/or Output Capacitors May

Be Used for Compensation

values in between 1000pF and 1糉 . Once again, Linear

Technology strongly recommends testing stability in situ

for any LT3092 application across all operating conditions,

especially ones that present complex impedance networks

at the input and output of the current source.

If an application refers the bottom of the LT3092 current

source to GND, it may be necessary to bypass the top

of the current source with a capacitor to GND. In some

cases, this capacitor may already exist and no additional

capacitance is required. For example, if the LT3092 was

used as a variable current source on the output of a power

supply, the output bypass capacitance would suf ce to

provide LT3092 stability. Other applications may require

the addition of a bypass capacitor. Once again, the same

capacitor value requirements previously mentioned apply

in that an upper bound of 1000pF exists for small values

of capacitance, and a lower bound of 1糉 (ESR < 0.5?

exists for large value capacitors. A series RC network may

also be used as necessary, and depends on the application

requirements.

In some extreme cases, capacitors or series RC networks

may be required on both the LT3092s input and output to

stabilize the circuit. Figure 4 depicts a general application

using input and output capacitor networks, rather than

an input-to-output capacitor. As the input of the current

source tends to be high impedance, placing a capacitor

on the input does not have the same effect as placing a

3092 F04

SET

OUT

LT3092

10糀

OUT

SET

OUT

Figure 3. Compensation From Input to

Output of Current Source Provides Stability

3092 F03

SET

OUT

LT3092

10糀

COMP

SET

OUT

COMP

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