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PI2123 Datasheet(PDF) 15 Page - Vicor Corporation |
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PI2123 Datasheet(HTML) 15 Page - Vicor Corporation |
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15 / 20 page  Picor Corporation • picorpower.com PI2123 Rev 1.0 Page 15 of 20 curves versus conducted current at given ambient temperatures and air flow. OV/UV resistor selection: The UV and OV comparator inputs are used to monitor the input voltage and will indicate a fault condition when this voltage is out of range. The UV & OV pins can be configured in two different ways, either with a divider on each pin, or with a three- resistor divider to the same node, enabling the elimination of one resistor. Under-voltage is monitored by the UV pin input and over-voltage is monitored with the OV pin input. The Fault pin ( FT ) will indicate a fault (active low) when the UV pin is below the threshold or when the OV pin is above the threshold. The threshold is 0.50V typical with 25mV hysteresis and the input current is less than ±1µA. It is important to consider the maximum current that will flow in the resistor divider and maximum error due to UV and OV input current. Set the resistor current to 100µA or higher to maintain better than 1% accuracy for UV and OV due to the bias current. The three-resistor voltage divider configuration for both UV and OV to monitor the same voltage node is shown in Figure 19: Ra TH I OV V Ra ) ( = Set value based on system allowable current Ra Ra I ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = 1 ) ( ) ( UV V OV V Ra Rb () ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − + = 1 ) ( ) ( TH UV V UV V Rb Ra Rc Where: ) ( TH UV V : UV threshold voltage at Vin. ) ( TH OV V : OV threshold voltage at Vin. ) (UV V : UV voltage set Ra I : current. Ra Alternatively, a two-resistor voltage divider configuration can be used and is shown in Figure 20. Figure 20 : UV & OV two-resistor divider configuration The UV resistor voltage divider can be obtained from the following equations: RUV TH UV I UV V R ) ( 1 = Set value based on system allowable current UV R1 A I RUV μ 100 ≥ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = 1 ) ( ) ( 1 2 TH UV UV UV V UV V R R Where: ) ( TH UV V : UV threshold voltage RUV I : current UV R1 RUV TH UV I UV V R ) ( 1 = Set value based on system allowable current OV R1 A I RUV μ 100 ≥ ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − = 1 ) ( ) ( 1 2 TH OV OV OV V OV V R R Where: ) ( TH OV V : OV threshold voltage ROV I : current. OV R1 Figure 19: UV & OV three-resistor divider configuration |
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