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PI2121-EVAL1 Datasheet(PDF) 6 Page - Vicor Corporation |
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PI2121-EVAL1 Datasheet(HTML) 6 Page - Vicor Corporation |
6 / 12 page Picor Corporation • www.picorpower.com PI2121-EVAL1 User Guide Rev 1.1 Page 6 of 12 3.0 Blanking timer setup: 3.1 The blanking timer provides noise filtering for typical switching power conversion that might cause premature reverse current detection by masking the reverse fault condition. The shortest blanking time is 50 ns when the BK pin is connected to ground. Connecting an external resistor (RBK, reference designators R6 for SiP1 and R13 for SiP2) between the BK pin and ground will increase the blanking time as shown in Figure 5. Where: RBK ≤ 200 KΩ Note: When BK is connected to VC for slave mode . operation,then the blanking time will be 270 ns typically. 4.0 Auxiliary Power Supply (Vaux): 4.1 The PI2121 ORing solution has a separate input (VC) that provides power to the control circuitry and the internal gate driver. An internal voltage regulator (VC) clamps the VC voltage to 15.5 V typically. 4.2 Connect an independent power source to the Vaux inputs of PI2121-EVAL1 Evaluation Board to supply power to the VC inputs. The Vaux voltage should be 5 V higher than Vin (redundant power source output voltage) to fully enhance the internal MOSFET. 4.3 10 Ω bias resistors (Rbias, reference designators R7 and R14) are installed on the PI2121-EVAL1 board between each Vaux input and VC pin of the PI2121 solution. 4.4 If Vaux is higher than the Clamp voltage, 15.5 V typical, the Rbias value has to be changed using the following equations: 4.4.1 Select the value of Rbias using the following equation: Rbias = Vauxmin –VCclampMAX ICmax 4.4.2 Calculate Rbias maximum power dissipation: PdRbias = (Vauxmax –VCclampMIN)2 Rbias Where: Vauxmin: Vaux minimum voltage Vauxmax: Vaux maximum voltage VCClampMAX: Maximum controller clamp voltage, 16.0 V VCClampMIN: Minimum controller clamp voltage, 14.0 V ICmax: Controller maximum bias current, use 4.2 mA 4.4.3 For example, if the minimum Vaux = 22 V and the maximum Vaux = 28 V Rbias = Vauxmin –VCclampMAX = 22 V–16 V =1.429 KΩ ICmax 4.2 mA , use 1.43 K Ω 1% resistor PdRbias = (Vauxmax –VCclampMIN)2 = (28 V–14.0 V)2 =137 mW Rbias 1.43 K Ω Note: Minimize the resistor value for low Vaux voltage levels to avoid a voltage drop that may reduce the VC voltage lower than required to drive the gate of the internal MOSFET. Figure 5 –BK Resistor selection versus Blanking Time |
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