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Interface and Isolation
Interface and Isolation
Documents ADuM54xx: recommendations on how to put 2 ADUM54xx in parallel?
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  • INTERFACE AND ISOLATION SUPPORT COMMUNITY
  • Tags List (Interface & Isolation)
  • +General: FAQ
  • +AD5700: FAQ
  • ADG324x: FAQ
  • +ADM2687: FAQ
  • +ADN4695E: FAQ
  • ADuM1100: FAQ
  • +ADUM1200: FAQ
  • ADuM1201: FAQ
  • +ADuM1230: FAQ
  • +ADuM1250: FAQ
  • ADuM1251: FAQ
  • +ADUM1300: FAQ
  • ADuM1301: FAQ
  • +ADUM1400: FAQ
  • +ADUM1401: FAQ
  • +ADuM1402: FAQ
  • ADuM1420: FAQ
  • +ADuM1440: FAQ
  • ADuM1441: FAQ
  • +ADuM144x: FAQ
  • +ADuM2400: FAQ
  • ADuM2401: FAQ
  • ADuM2402: FAQ
  • +ADUM3070: FAQ
  • +ADuM3160: FAQ
  • +ADuM3190: FAQ
  • ADuM3201: FAQ
  • ADuM3220: FAQ
  • ADuM3221: FAQ
  • ADuM3223: FAQ
  • ADuM3440: FAQ
  • ADuM3470: FAQ
  • ADuM3471: FAQ
  • ADuM3480: FAQ
  • ADuM3482: FAQ
  • +ADuM4160: FAQ
  • +ADuM4190: FAQ
  • +ADuM4223: FAQ
  • ADuM4400: FAQ
  • ADuM4472: FAQ
  • +ADuM5000: FAQ
  • +ADUM5010: FAQ
  • ADuM5201: FAQ
  • ADuM5202: FAQ
  • +ADuM5230: FAQ
  • +ADuM5241: FAQ
  • ADuM5400: FAQ
  • ADuM5401: FAQ
  • ADuM5402: FAQ
  • ADuM5403: FAQ
  • ADuM6000: FAQ
  • ADuM6132: FAQ
  • +ADuM620X: FAQ
  • ADuM6400: FAQ
  • ADuM6401: FAQ
  • ADuM6402: FAQ
  • ADuM7234: FAQ
  • +EVAL-CN0313: FAQ
  • +isoPower: FAQ
  • +MLVDS: FAQ
  • +SPIsolator: FAQ
  • +3B01: FAQ
  • +AC1307: FAQ
  • +AD202: FAQ
  • +AD2S75: FAQ
  • +AD5700-1: FAQ
  • +ADBMS6821: FAQ
  • +ADM202: FAQ
  • +ADM202E: FAQ
  • +ADM206: FAQ
  • +ADM2481: FAQ
  • +ADM2483: FAQ
  • +ADM2484E: FAQ
  • +ADM2486: FAQ
  • +ADM2582E: FAQ
  • +ADM2587E: FAQ
  • +ADM2682E: FAQ
  • +ADM2687E: FAQ
  • +ADM3052: FAQ
  • +ADM3053: FAQ
  • +ADM3054: FAQ
  • +ADM3074E: FAQ
  • +ADM3075E: FAQ
  • +ADM3202: FAQ
  • +ADM3251E: FAQ
  • +ADM3252E: FAQ
  • +ADM3260: FAQ
  • +ADM3483: FAQ
  • +ADM3485E: FAQ
  • +ADM3491: FAQ
  • +ADM483E: FAQ
  • +ADM4852: FAQ
  • +ADM485: FAQ
  • +ADN4650: FAQ
  • +ADN4651: FAQ
  • +ADN4690E: FAQ
  • +ADP5585: FAQ
  • +ADP5588: FAQ
  • +ADP5589: FAQ
  • ADuM for >2kV voltage
  • ADuM1100 glitch filter window vs. very narrow pulses
  • +ADUM1100: Different supply voltage
  • +ADUM1201 suitable to work in CAN Bus?
  • ADuM1250 detect levels scale with the supply
  • ADuM1250 failure in hot-swapping application
  • ADuM1250 Side1 minimum levels
  • ADuM1250: tips to reduce power consumtion in a battery application.
  • ADuM1251 max permitted voltage for IEC 61010 reinforced
  • ADuM1251: Flash testing limits
  • ADuM1251: Vol issues with non standard I2C applications
  • ADuM1301 Output current capability
  • ADuM1301: Default output state on power up
  • ADuM1402: Is there any specified or typical jitter performance?
  • ADuM1402: Can it be modified to same configuration as the I2C isolator ADUM1250 ?
  • AduM1402: Tristate outputs
  • +ADUM1402BRWZ: FAQ
  • ADuM1420: Maximum switching frequency is given as 5Mbps in datasheet, should this be 5MHz?
  • +ADUM2250: FAQ
  • ADuM2400 input current test
  • ADuM2400: 12 V digital signal
  • ADuM2401 driving long cable
  • ADuM2401 output driving 2m cable
  • ADUM2401: Common mode voltage
  • +ADUM241D: FAQ
  • +ADUM3160/4160: Can this device be used for USB-IF standard host isolation
  • ADuM3201 solderability
  • +ADUM3210: FAQ
  • +ADUM3211: FAQ
  • +ADUM3220: There is no Junction to Ambient thermal resistance given in datasheet
  • ADuM3223 in H-bridge
  • ADuM3223 vs ADuM3220
  • ADUM3230 at low frequency
  • ADuM3470 efficiency over temperature range
  • ADuM3470 with VDD1>VDDA
  • ADuM3470: thermal derating
  • ADuM3471
  • ADuM3480 datasheet questions/corrections
  • adum3482 optoisolator and power pin permutation query
  • +ADUM4135: FAQ
  • +ADUM4160/ADUM3160: Can these devices support OTG (On The Go) USB?
  • +ADUM4165: FAQ
  • +ADUM4221: FAQ
  • ADuM4223 for safety class II
  • ADuM4472 isolation performance for IEC 60601-1
  • ADuM5000 DC-DC shutdown
  • +ADUM5020: FAQ
  • +ADUM5028: FAQ
  • +ADUM5201: Is it possible to switch the isolated Voltage off, by setting Ve2 to low?
  • ADuM5230 no output voltage (Viso)
  • ADuM5241
  • ADuM5241 overvoltage protection
  • ADuM5241: Application hints for addressing EMC problems in order to pass CE test?
  • ADuM5241: What output impedance can we expect in Z state when Viso is unpowered?
  • ADuM5401: How do I connect PIN 7 (RCout) of ADuM5401 in a standalone application?
  • ADuM5401: Is 1 Mbps the maximum data rate, can this device be used above 1 Mbps?
  • +ADUM5401WCRW vs ADUM5401WCRWZ-1: What is the difference?
  • +ADUM5402: 5V supply disturbed by device's DC/DC converter.
  • +ADUM5403: RCOUT pin connection if not used
  • ADuM54xx and ADuM64xx: Startup Problems
  • ADUM54xx: Can I make parallel connection of devices in a redundancy configuration?
  • ADuM54xx: recommendations on how to put 2 ADUM54xx in parallel?
  • ADuM6000 and RCin/RCsel High Level thresholds
  • +ADUM6132 and capacitive loading of 10nF effect on the device
  • ADuM6400 specs changed
  • ADuM6400: PCN # 11-0188 typo error
  • ADuM6401 and common mode transient immunity
  • ADuM6402 VDDL input pin connection
  • +ADUM7234: Why is maximum output differential voltage only 350V and what happens if it is exceeded?
  • Any condition needs to be met for the state of PIO outputs to remain after 1-Wire connection is removed?
  • Can ADUM3440 be used to provide Isolation from high frequency noise?
  • Can the ADuM1250 drive a 25 metre line?
  • Can you expalin the difference in ESD protection between the ADuM240x and the ADuM440x icoupler parts?
  • CTRL Pins on ADuM3482
  • Difference between ADuM2401 v ADuM4401
  • +DS2406+: FAQ
  • +DS2406P+: FAQ
  • DS2408: FAQ
  • +DS2408S+: FAQ
  • DS2413 8" UNTSTD RAW DIE (A2) SA: FAQ
  • +DS2413P+: FAQ
  • +DS2413Q+T&R: FAQ
  • +DS8500-JND+: FAQ
  • +DS8500-KIT#: FAQ
  • +EVAL-AD5700-1EBZ: FAQ
  • EVAL-ADuM322xEBZ dimensions
  • Generating 3 Voltages with ADuM347x
  • glitch filter width of the ADuM144X family?
  • How to use DS2413 as communcation between TWS earbud & Charger-box
  • I set EN1 and EN2 high to disable the internal refresh and watchdog for lowest operating power. Is DC correctness guaranteed in this state?
  • input voltage levels are recommended?
  • Is ADuM6000 (or ADuM5000) compliant with the USB low power suspend mode current limits?
  • +LT3960: FAQ
  • +LTC4332: FAQ
  • +LTM2884: FAQ
  • +MAX12930BASA+: FAQ
  • +MAX12931: FAQ
  • +MAX13041: FAQ
  • +MAX13050: FAQ
  • +MAX13054AEASA+T: FAQ
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  • MAX22508E Data Sheet Pinout Clarification
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  • Will there be dual versions of the ADuM144X family

ADuM54xx: recommendations on how to put 2 ADUM54xx in parallel?

Question

For redundancy purposes we need some recommendations on how to put 2 ADUM54xx
in parallel?

Answer

It turns out to be a little tricky to use these parts in a redundant parallel
configuration. The main issues are:

1) the power supply sections should be diode ORed so that if the fault is on
the Viso side, it can not drag both units down. This also prevents the units
from back driving each other.

2) The data outputs can not simply be connected together. Assuming one device
is "on" and one is "off". A high output on the active device would be
connected to an inactive output on the device that is off. This will power
the isolated side of the "off" device through the ESD protection diodes. Once
the secondary side of the "off" device comes up, its outputs will default to
low. But this output is already being pulled high by the output of the "on"
device This will cause large currents to flow, probably 30mA on the output
and an additional 90mA on the VDD1 line, and the output will go to an
undetermined state. Probably half of Viso.
The solution is again to diode OR the outputs together with pull down
resistors to be sure it goes low when required. The speed of the output will
depend on the size of the pull down resistor, the smaller the value, the
faster the output will slew low, but the more current the output will require.

Tags: interface and isolation adum5400 3LFX5426
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