Electronic Components Datasheet Search |
|
LT3092ISTTR Datasheet(PDF) 10 Page - Linear Technology |
|
LT3092ISTTR Datasheet(HTML) 10 Page - Linear Technology |
10 / 22 page LT3092 10 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 1μF (ESR < 0.5Ω), 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 capacitor’s 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 benefits. 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 1μF for large capacitors such that almost any value capacitor can be used. This allows the user greater flexibility for frequency compensating the loop and fine 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 100Ω to about 5k, especially for capacitor Figure 4. Input and/or Output Capacitors May Be Used for Compensation values in between 1000pF and 1μF. 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 suffice 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 1μF (ESR < 0.5Ω) 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 LT3092’s 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 IN SET OUT + – LT3092 10μA IOUT RSET ROUT COUT OR VIN COUT ROUT CIN RIN Figure 3. Compensation From Input to Output of Current Source Provides Stability 3092 F03 IN SET OUT + – LT3092 10μA CCOMP OR RSET ROUT RCOMP CCOMP |
Similar Part No. - LT3092ISTTR |
|
Similar Description - LT3092ISTTR |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |