Motore di ricerca datesheet componenti elettronici |
|
OPA202 Scheda tecnica(PDF) 24 Page - Texas Instruments |
|
OPA202 Scheda tecnica(HTML) 24 Page - Texas Instruments |
24 / 49 page Op Amp Core R F R L V IN (1) I D OUT ESD Current- Steering Diodes +V S V+ TVS (2) Edge-Triggered ESD Absorption Circuit V± V S TVS (2) Copyright © 2017, Texas Instruments Incorporated 100 100 IN +IN RS (3) RI 24 OPA202, OPA2202, OPA4202 SBOS812G – OCTOBER 2017 – REVISED MARCH 2020 www.ti.com Product Folder Links: OPA202 OPA2202 OPA4202 Submit Documentation Feedback Copyright © 2017–2020, Texas Instruments Incorporated Figure 43 shows a specific example where the input voltage, VIN, exceeds the positive supply voltage (+VS) by 500 mV or more. Much of what happens in the circuit depends on the supply characteristics. If +VS can sink the current, one of the upper input steering diodes conducts and directs current to +VS. Excessively high current levels can flow with increasingly higher VIN. As a result, the data sheet specifications recommend that applications limit the input current to 10 mA. If the supply is not capable of sinking the current, VIN may begin sourcing current to the operational amplifier, and then take over as the source of positive supply voltage. The danger in this case is that the voltage can rise to levels that exceed the operational amplifier absolute maximum ratings. Another common question involves what happens to the amplifier if an input signal is applied to the input while the power supplies +VS or –VS are at 0 V. It depends on the supply characteristic while at 0 V, or at a level below the input signal amplitude. If the supplies appear as high impedance, then the operational amplifier supply current may be supplied by the input source through the current steering diodes. This state is not a normal bias condition; the amplifier most likely does not operate normally. If the supplies are low impedance, then the current through the steering diodes can become quite high. The current level depends on the ability of the input source to deliver current, and any resistance in the input path. If there is an uncertainty about the ability of the supply to absorb this current, external Zener diodes may be added to the supply pins as shown in Figure 43. The Zener voltage must be selected such that the diode does not turn on during normal operation. However, the Zener voltage must be low enough so that the Zener diode conducts if the supply pin rises above the safe operating supply voltage level. (1) VIN = +VS + 500 mV. (2) TVS: +VS(max) > VTVSBR (Min) > +VS (3) Suggested value is approximately 5 kΩ in overvoltage conditions. Figure 43. Equivalent Internal ESD Circuitry in a Typical Application Circuit |
Codice articolo simile - OPA202_V05 |
|
Descrizione simile - OPA202_V05 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore 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 |