Electronic Components Datasheet Search |
|
ISO213 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
|
|
ISO213 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 13 page 8 ® ISO213 system transients. The isolation barrier has been extensively evaluated under a combination of high temperatures and high voltage to confirm its performance in this respect. ISO213 is free from partial discharges at rated voltages. PARTIAL DISCHARGE TESTING IN PRODUCTION This test method provides far more qualitative information about stress withstand levels than did previous stress tests. It also provides quantitative measurements from which quality assurance and control measures can be based. Tests similar to this test have been used by some manufacturers such as those of high voltage power distribution equipment for some time. They employed a simple measurement of RF noise to detect ionization. This method was not quantitative with regard to energy of the discharge and was not sensitive enough for small components such as isolation amplifiers. Now, however, manufacturers of HV test equipment have developed means to measure partial discharge, and VDE, the German standards group, has adopted use of this method for the testing of opto-couplers. To accommodate poorly de- fined transients, the part under test is exposed to a voltage that is 1.6 times the continuous rated voltage and must display <5pC partial discharge level in a 100% production test. Where transients are not present on an applied voltage and the bulk inception voltage is not exceeded, degradation will not take place. This is the case where OEM production testing is performed to satisfy regulatory requirements. The normal test is to apply a relatively slow ramp to a defined test voltage. Maintain that voltage for 1 minute and then ramp to zero. Where this test voltage is less than or equal to the partial discharge test voltage it can be seen that degrada- tion will not occur. Hence ISO213 is guaranteed to with- stand a continuous test voltage for 1 minute at the partial discharge test voltage. INSTALLATION AND OPERATING INSTRUCTIONS POWER SUPPLY AND SIGNAL CONNECTIONS As with any mixed analog and digital signal component, correct decoupling and signal routing precautions must be used to optimize performance. Figure 1 shows the proper power supply and signal connections. VCC should be by- passed to Com 2 with a 0.1 µF ceramic capacitor and 100µH inductor as close to the device as possible. Short leads will minimize lead inductance. A ground plane will also reduce noise problems. If a low impedance ground plane is not used, signal common lines, and ACom 2 should be tied directly to the ground at the supply and Com 2 returned via a separate trace to the supply ground. To avoid gain and isolation mode (IMR) errors introduced by the external circuit, connect grounds as indicated in Figure 3. Layout practices associated with isolation amplifi- ers are very important. In particular, the capacitance associ- ated with the barrier, and series resistance in the signal and reference leads, must be minimized. Any capacitance across the barrier will increase AC leakage and, in conjunction with ground line resistance, may degrade high frequency IMR. VOLTAGE GAIN MODIFICATIONS The uncommitted instrumentation amplifier at the input can be used to provide gain, signal inversion, or current to voltage conversion. The standard design approach for any instrumentation amplifier stage can be used, provided that the full scale voltage appearing on FB does not exceed ±10V. Also, it should be noted that the current required to drive the equivalent impedance of any feedback network is supplied by the internal DC/DC converter and must be taken into account when calculating the loading added to ±V SS. ISOLATED POWER OUTPUT DRIVE CAPABILITY On the input side of ISO213, there are two power supplies capable of delivering 3mA at ±14V typical to power external circuitry. When using these supplies with external loads, it is recommended that additional decoupling in the form of 10 µF tantalum bead capacitors, is added to improve the voltage regulation. Loss of linearity will result if additional filtering is not used with an output load. Again, power dissipated in a feedback network must be subtracted from the available power output at ±V SS. If ISO213 is to be used in multiple applications, care should be taken in the design of the power distribution network, especially when all ISO213s are synchronized. It is best to use a well decoupled distribution point and to take power to each ISO213 from this point in a star arrangement as shown in Figure 4. FIGURE 3. Technique for Connecting Com 1 and Com 2. V ISO CC +V CC –V Power Supply Load Circuit R ACom 2 Com 2 Com 1 Input Common C INT C EXT 2 C EXT 1 V OUT C and R have a direct effect. EXT 2 C has minimal effect on total IMR. EXT 1 F B – + |
Similar Part No. - ISO213 |
|
Similar Description - ISO213 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |