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PI2002 数据表(PDF) 18 Page - Vicor Corporation |
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PI2002 数据表(HTML) 18 Page - Vicor Corporation |
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18 / 23 page  Picor Corporation • picorpower.com PI2002 Rev1.1 Page 18 of 23 Typical application Example 2: Low side disconnect switch Requirement: Bus Voltage = -48V (-36V to -60V, 100V for 100ms transient) Maximum operating load current = 5A Load current shutdown set at = 6A Maximum Ambient Temperature = 60°C Solution: 1. A PI2002 with a suitable MOSFET for -48V power source should be used and configured as shown in Figure 22. The VC is biased from the return line through a bias resistor. 2. Select a suitable N-Channel MOSFET: Select the N-Channel MOSFET with voltage rating higher than the input voltage, Vin, plus any expected transient voltages, with a low Rds(on) that is capable of supporting the full load current with margin. For instance, a 100V rated MOSFET with 10A current capability is suitable. An exemplary MOSFET having these characteristic is Si4486EY from Vishay Siliconix. From Si4486EY datasheet: • N-Channel MOSFET • VDS= 100V • ID = 23A continuous drain current at 125°C • VGS(MAX) = ± 20V • RθJA= 50°C/W • RDS(on)=20mΩ typical at VGS=10V, TJ=25°C Reverse current threshold is: mA m mV on Rds reverse Vth reverse Is 300 20 6 ) ( . . − = Ω − = = Power dissipation: Rds(on) is 25mΩ maximum at 25°C & 10Vgs and will increase as the temperature increases. Add 40°C to maximum ambient temperature to compensate for the temperature rise due to power dissipation. At 100°C (60°C + 40°C) Rds(on) will increase by 63%. Ω = ∗ Ω = m m on Rds 41 63 . 1 25 ) ( maximum at 100°C Maximum Junction temperature C m A W C C T J ° = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ Ω ∗ ∗ ° + ° = 111 41 ) 0 . 5 ( 50 60 2 max Recalculate based on calculated Junction temperature, 111°C. At 111°C Rds(on) will increase by 71%. Ω = ∗ Ω = m m on Rds 75 . 4 71 . 1 25 ) ( maximum at 111°C C m A W C C T J ° = ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ Ω ∗ ∗ ° + ° = 113 75 . 42 ) 0 . 5 ( 50 60 2 max Vaux: Connect each controller to the return path with a separate bias resistor, Rbias. To reduce Rbias power dissipation, clamp VC is selected at 13V which is less than the actual PI2002 clamp voltage (15V typical). 13V is higher than PI2002 maximum gate clamp voltage (11V). 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. Select sense resistor: Sense resistor is selected based on load current shutdown. Where Ω = = = − m A mV I V R Shutdown TH FOC Sense 19 6 114 Select 20mΩ resistor 20mΩ Sense Resistor power dissipation at maximum operating current W m A R I Pd Sense RSense 5 . 0 20 ) 5 ( * 2 2 max = Ω = = As an exemplary selected 1206 20mΩ/1W/1% sense resistor from Vishay-Dale: Part Number: WSL1206R0200FEK Maximum current turn off: A m mV R V Isd Sense MAX TH FOC MAX 05 . 6 20 121 = Ω = = − − Minimum current turn off: A m mV R V Isd Sense MIN TH FOC MIN 35 . 5 20 107 = Ω = = − − 4. 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. |
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