Electronic Components Datasheet Search |
|
MSK155 Datasheet(PDF) 3 Page - M.S. Kennedy Corporation |
|
MSK155 Datasheet(HTML) 3 Page - M.S. Kennedy Corporation |
3 / 6 page APPLICATION NOTES CURRENT LIMIT (SEE TYPICAL CONNECTION DIAGRAM) SAFE OPERATING AREA (SOA) The output stage of this power operational amplifier has three distinct limitations: 1. The current handling capability of the die metallization. 2. The junction temperature of the output device's. 3. Secondary breakdown. All applications should be checked against the SOA curves. NOTE: The output stage is protected against transient flyback. However, for protection against sustained, high energy flyback, external fast-recovery reverse biased diodes should be connected from the output to ground. RCL=(0.809V/ICL) - 0.057Ω A value of current limit resistance can be calculated as fol- lows: Where: RCL is the current limit resistor value. ICL is the current limit desired. 0.057Ω is the drop in the current limit path across internal impedances other than the actual current limit resistor. 0.809Ω volts is the voltage drop that must be developed across the current limit connections to activate the current limit circuit at 25°C. It is recommended the user limit output current to a value as close to the required output current as possible, without clip- ping output voltage swing. Current limit will vary with case tem- perature. Refer to the typical performance curves to predict cur- rent limit drift. If current limit is not required replace the resistor TYPICAL CONNECTION DIAGRAM A 0.1 microfarad ceramic disc and low ESR capacitor with a value of 10 microfarads per amp of output current should be placed in parallel from each power supply pin to ground. These capacitors must be rated for the full power supply voltage. Since the MSK155 is commonly used in circuits where the loop gain is greater than 10 V/V, high frequency noise that enters the op- amp through the power supply lines will be amplified and could cause the amplifier to break into oscillation. In addition, without supply bypassing, the inductance of the power supply lines interacts with capacitive loads to form an oscillatory LC tank circuit. The power supply decoupling capacitors will minimize this effect and keep the circuit stable. POWER SUPPLY DECOUPLING Input protection circuitry within the MSK155 will clip differ- ential input voltages greater than VCC. The inputs are also pro- tected against common mode voltages up to the supply rails as well as static discharge. There are current limiting resistors in series with each input. These resistors may become damaged in the event the input overload is capable of driving currents above 1mA. If severe overload conditions are expected, external input current limiting resistors are recommended. INPUT PROTECTION It is recommended that the parallel sum of the input and feed- back resistor be 1000 ohms or less to minimize phase shift caused by the R-C network formed by the input resistor, feed- back resistor and input capacitance. An effective method of check- ing amplifier stability is to apply the worst case capacitive load to the output of the amplifier and drive a small signal square wave across it. If overshoot is less than 25%, the system will typically be stable. STABILITY 3 8548-126 Rev. E 6/14 |
Similar Part No. - MSK155_15 |
|
Similar Description - MSK155_15 |
|
|
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 |