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PI2127-EVAL1 数据表(PDF) 6 Page - Vicor Corporation |
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PI2127-EVAL1 数据表(HTML) 6 Page - Vicor Corporation |
6 / 9 page Picor Corporation • picorpower.com PI2127-EVAL1 User Guide Rev. 1.0 Page 6 of 9 4.10. D2 should be on. This is due to a reverse voltage fault condition caused by the bus voltage being high with respect to the input voltage (Vin2+). 4.11. Enable (turn on) PS2 output. 4.12. Verify that both PS1 and PS2 are sharing load current evenly by looking at the supply current. Power supplies output may need adjustment to set current sharing between the supplies. 4.13. Disable (turn off) PS1, PS2, and PS3 outputs. 4.14. Enable (turn on) PS2 output then Enable and PS3 outputs. 4.15. Verify that the electronic load voltage reading is few millivolts below 48V. This verifies that the PI2127-01-LGIZ internal MOSFET is in conduction mode. 4.16. D2 should be off. This verifies that there is no fault condition. 4.17. Verify that Vin1+ is low. This verifies that the PI2127 (U1) internal FET is off. 4.18. D1 should be on. This is due to a reverse voltage fault condition caused by the bus voltage being high with respect to the input voltage (Vin1+). Note: When the PI2127 internal MOSFET is in the on state, it will not turn off unless a reverse current greater than 0.75A is sensed in the MOSFET. When both power supplies are enabled and both PI2127 MOSFETs are in RDS(on); if one of the sources (Power supplies) removed or disabled both PI2127 stay on unless the disabled power supply sources current greater than 0.75A when turned off. 5. Internal MOSFET RDS(on) Measurement: 5.1. The internal MOSFET RDS(on) can be measured with a voltmeter between the S1 and D1 Kelvin connection for U1 and between the S2 and D2 Kelvin connection for U2. The potential between S1 and D1 is the voltage drop across the internal MOSFET and: Where: : Voltage drop across the internal MOSFET : Input current. Note: The RDS(on) value is temperature dependent and the junction temperature increases directly proportional to power dissipation. 6. Input short circuit test: PI2127 has a very fast response (80ns) to a reverse current (Input short) fault condition. Measuring a short period event requires attention to the test set-up. Before proceeding, consider the following: 6.1. To emulate a real application, the BUS supplies for this test should have a solid output source such as a DC-DC converter that supplies high current and can be connected very close to the evaluation board to reduce stray parasitic inductance. Or use the prospective supply sources of the end application where the PI2127 will be used. Typical bench power supplies have slow response to output load change. In this test when the power supply output is shorted and then released, the bench power supply may produce high output voltage with high current capability that may damage the device under test. 6.2. Do not install Input capacitors (C1 and/or C2) in this test. 6.3. Output capacitor (C5) should be installed. 6.4. Place the scope probes very close to the PI2127 S and D pins to measure Vin and Vout, and make sure that the scope ground leads are very short. You may use a close by ground pad for the scope probe return, such as C1, C2, C3 and C4 return pads. 6.5. Apply a short at one of the inputs (Vin1+ or Vin2+) when both SIP’s (U1 and U2) are on, PS1 and PS2 are enabled. The short can be applied electronically using a MOSFET connected between Vin+ and Vin- or simply by connecting Vin+ to Vin-. Then measure the response time between when the short is applied and the PI2127 internal MOSFET is disconnected (or turned off). An example for the PI2127 response time to an input short circuit is shown in Figure 4. |
类似零件编号 - PI2127-EVAL1 |
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类似说明 - PI2127-EVAL1 |
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