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PI2061 Datasheet(PDF) 10 Page - Vicor Corporation |
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PI2061 Datasheet(HTML) 10 Page - Vicor Corporation |
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10 / 16 page  Picor Corporation • picorpower.com PI2061 Rev 1.4 Page 10 of 16 Schottky Diodes Selection: D1 and D2 Diode D1 (See Figure 1 & Figure 14.) must be a low reverse leakage Schottky diode capable of supporting 4A of peak gate discharge current for 10ns. Diode D2 must be a low reverse leakage Schottky diode capable of supporting 1A peak. Both diodes will have a reverse voltage of 13V during normal operation. Recommended diode for D1 and D2: PMEG4005EJ from NXP Sense Resistor Selection: Rs In typical load switch application the sense resistor is based on minimum trip current to allow maximum normal load current without interruption. Calculate Rs value at minimum Low Range Overcurrent Threshold voltage (VOC-THL): Where: : Minimum Low Range Overcurrent Threshold voltage, 63mV : Required minimum trip current Enable Input Circuit: EN EN pin can be tied directly to VC OR LEFT FLOATING if PI2061 should be enabled when the power is applied. If the user wants to control the device enable function, then EN pin can be pulled low with a resistor and signal FET, signal transistor or open collector logic as shown in Figure 12. Note that the enable control signal phase must be inverted. Use an enable resistor (REN) value between 300k and 400k with voltage rating that meets maximum input voltage. Figure 12: Enable circuit Fault Indication: FT FT is an open collector output and its return is referenced to SGND. When the SGND pin is floating on a bias resistor (RPG) or in a constant current circuit, a level shift circuit can be added to create an output referenced to the system ground. See Figure 13. Figure 13: FT level shift circuit Alternative Bias Circuit: Constant current circuit for high voltage application. In a wide operating input voltage range the size of RVC and RPG may be become large to support power dissipation. A simple constant current circuit, shown in Figure 14 can be used instead of RVC and RPG to allow the circuit to operate between 18V and 80V (100V/100ms transient) with low power dissipation components. Please refer to Picor application notes for more details on how to design a floating bias with the constant current circuit. Figure 14: Constant current bias circuit Vin PGND SN GATE SGND PI2061 6 1 7 2 SP 4 EN 5 RTN VC 3 RPG RS VC Vout D2 RVC REN EN QEN D1 100k 100k 100k FT Q2 Vin PGND SN GATE SGND PI2061 1 7 2 4 EN 5 RTN VC 3 RPG RS VC Vout RVC FT VC Q1 6 SP 15k D2 D1 Vin PGND SN GATE SGND PI2061 6 1 7 2 SP 4 EN 5 VC 3 RS Vout D1 6.8V 50k 1k Q1 2.6k 50k Q2 6.8V RTN 1µF FJV1845 FJV1845 2k IRF7853PbF M1 10m CVC D2 Not Recommended for New Designs |
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