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TPS2492/93 – High Voltage Hotswap Controller

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To introduce TPS2492/93 positive high voltage power limiting hotswap controllers

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TPS2492/93 – High Voltage Hotswap Controller

  1. 1. TPS2492/93 – High Voltage Hotswap Controller <ul><li>Source: T EXAS I NSTRUMENTS </li></ul>
  2. 2. Introduction <ul><li>Purpose </li></ul><ul><ul><li>To introduce TPS2492/93 positive high voltage power limiting hotswap controllers </li></ul></ul><ul><li>Outline </li></ul><ul><ul><li>What is hotswap? </li></ul></ul><ul><ul><li>TPS2492/93 overview </li></ul></ul><ul><ul><li>Functional block diagram </li></ul></ul><ul><ul><li>Typical application </li></ul></ul><ul><ul><li>Basic operation </li></ul></ul><ul><li>Content </li></ul><ul><ul><li>11 pages </li></ul></ul>
  3. 3. Hot Swap Basics <ul><li>Hot swap is the action of inserting modules or cables into a system with </li></ul><ul><ul><li>No interrupting power to the system </li></ul></ul><ul><ul><li>No disturbing data transactions </li></ul></ul><ul><li>Target systems include </li></ul><ul><ul><li>Consumer devices, like laptop peripherals, digital cameras, PDAs... </li></ul></ul><ul><ul><li>Telecommunication / datacommunication, like server backplanes, base stations, storage area networks... </li></ul></ul><ul><ul><li>Medical systems </li></ul></ul>
  4. 4. TPS2492/93 Hot Swap Controller <ul><li>9-V to 80-V Operation </li></ul><ul><li>High-Side Drive for External N-FET </li></ul><ul><li>Programmable FET Power Limit </li></ul><ul><li>Programmable Load Current Limit </li></ul><ul><li>Programmable Fault Timer </li></ul><ul><li>Load Current Monitor Output </li></ul><ul><li>Power Good and Fault Outputs </li></ul><ul><li>Enable/UV, OV Inputs </li></ul><ul><li>Latch or Auto Restart After Fault </li></ul><ul><li>EVM Available SLUU425 </li></ul><ul><li>Calculation Tool Available SLVC033 </li></ul>
  5. 5. Functional Block Diagram
  6. 6. Typical Application Circuit Input Clamp TVS Bypass capacitor Input voltage monitoring PROG voltage setting Fault time and restart interval (TP2493 only) setting External FET
  7. 7. Basic Operation – Board Plug in <ul><li>When the board plug in, the TPS2492/93 is held inactive with GATE, PROG, and TIMER held low, and with PG and FLT open drain. </li></ul><ul><li>After internal voltage stabilize, the GATE, PROG, TIMER, FLT and PG are released and the part begins sourcing current to the GATE pin. </li></ul><ul><li>The external FET begins to turn on. </li></ul>PG TIMER VOUT Input
  8. 8. Short Circuit Response <ul><li>The TPS2492/93 responds rapidly to a short circuit. </li></ul><ul><ul><li>The OUT voltage falls. </li></ul></ul><ul><ul><li>The limiter action begins </li></ul></ul><ul><ul><li>The fault timer starts. </li></ul></ul><ul><ul><li>The internal GATE clamp causes the GATE voltage to follow the output voltage down and subsequently limits the negative V GS . </li></ul></ul><ul><ul><li>The rapidly rising fault current overdrives the GATE amplifier causing it to overshoot and rapidly turn the external FET off. </li></ul></ul><ul><li>The FET will be slowly turned back on as the GATE amplifier recovers. </li></ul>
  9. 9. Gate Capacitor (dV/dt) Control <ul><li>When the VPROG calculates below the 0.4 V minimum, one option is to use dv/dt control to start the uncharged output capacitor. </li></ul><ul><li>In this way, the power limiting is not used on power up. </li></ul>
  10. 10. Design Tools <ul><li>Design Calculator </li></ul><ul><ul><li>Simply enter application specifications into this spreadsheet calculator to get the values of required external components. </li></ul></ul><ul><ul><li>Download </li></ul></ul><ul><li>Evaluation Module </li></ul><ul><ul><li>TPS2492EVM-001: for positive 12V rails </li></ul></ul><ul><ul><li>TPS2492EVM-003: for positive 48V rails </li></ul></ul><ul><ul><li>TPS2493EVM-002: for positive 12V rails </li></ul></ul><ul><ul><li>TPS2493EVM-004: for positive 48V rails </li></ul></ul>
  11. 11. Additional Resource <ul><li>For ordering TPS2492/93 Hotswap controllers, please click the part list or </li></ul><ul><li>Call our sales hotline </li></ul><ul><li>For more product information go to </li></ul><ul><ul><li>http://focus.ti.com/docs/prod/folders/print/tps2492.html </li></ul></ul><ul><li>Visit element14 to post your question </li></ul><ul><ul><li> www.element-14.com </li></ul></ul><ul><li>For additional inquires contact our technical service hotline or even use our “Live Technical Chat” online facility </li></ul>

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