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PI2001 Datasheet(PDF) 19 Page - Vicor Corporation |
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PI2001 Datasheet(HTML) 19 Page - Vicor Corporation |
19 / 23 page Vaux: Connect each controller to the return path with a separate bias resistor, Rbias. Picor Corporation • picorpower.com PI2001 Rev 1.0 Page 19 of 23 To reduce power dissipation, is selected at 13V which is less than the actual PI2001 clamp voltage (15V typical). 13V is higher than PI2001 maximum gate clamp voltage (10.5V). Rbias clamp VC Ω = − = − = K mA V V IC VC Vaux Rbias clamp 48 . 5 2 . 4 13 36 max min or 5.49KΩ Rbias maximum power dissipation is at maximum input voltage and minimum clamp voltage mW K V V Rbias VC Vaux Pd clampMIN Rbias 369 49 . 5 ) 15 60 ( ) ( 2 2 max = Ω − = − = 3. SP and SN pins: Connect the SP pin to the MOSFET source and controller GND pin, and connect the SN pin to Vin- and the drain of the MOSFET. 4. BK pin: Connect the BK pin to the GND pin to achieve the minimum reverse current response time. 5. SL pin: Not required, so leave floating. 6. FT pin: Connect the FT pin to logic input and to the logic power supply or to the VC pin via a resistor. 7. UV and OV inputs: sensing input voltages Vin1- and Vin2- separately in this application the resistor divider has to be connected between Vin1-/Vin2- and return. The PI2001 controller GND pins are referenced to the load side, if the resistor dividers are connected between Return and Vin1-/Vin2- it will produce an error due the voltage drop across the MOSFET and will expose the OV and UV controller inputs to a high current in case of an input short circuit and will damage the controller. The voltage across the load can be monitored by one controller or both. The following shows the resistor voltage divider configuration using the three-resistor divider configuration: Set A I Ra μ 100 = Ω = = = k A mV I UV V Ra Ra TH 5 100 500 ) ( μ or 4.99kΩ 1% ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = 1 ) ( ) ( UV V OV V Ra Rb Ω = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − Ω = K V V k 55 . 4 1 34 65 99 . 4 Or Rb=4.53KΩ () ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − + = 1 ) ( ) ( TH UV V UV V Rb Ra Rc () Ω = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − Ω + Ω = k mV V K k Rc 638 1 500 34 53 . 4 99 . 4 or 634kΩ 1% Figure 17: PI2001 in low side -48V application |
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