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HIP6301 Datasheet(PDF) 12 Page - Renesas Technology Corp |
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HIP6301 Datasheet(HTML) 12 Page - Renesas Technology Corp |
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12 / 17 page  HIP6301 FN4765 Rev 6.00 Page 12 of 17 December 27, 2004 Current Sensing and Balancing Overview The HIP6301 samples the on-state voltage drop across each synchronous rectifier FET, Q2, as an indication of the inductor current in that phase, see Figure 7. Neglecting AC effects (to be discussed later), the voltage drop across Q2 is simply rDS(ON)(Q2) x inductor current (IL). Note that IL, the inductor current, is either 1/2, 1/3, or 1/4 of the total current (ILT), depending on how many phases are in use. The voltage at Q2’s drain, the PHASE node, is applied to the RISEN resistor to develop the IISEN current to the HIP6301 ISEN pin. This pin is held at virtual ground, so the current through RISEN is The IISEN current provides information to perform the following functions: 1. Detection of an overcurrent condition 2. Reduce the regulator output voltage with increasing load current (droop) 3. Balance the IL currents in multiple channels Overcurrent, Selecting RISEN The current detected through the RISEN resistor is averaged with the current(s) detected in the other 1, 2, or 3 channels. The averaged current is compared with a trimmed, internally generated current, and used to detect an overcurrent condition. The nominal current through the RISEN resistor should be 50 A at full output load current, and the nominal trip point for overcurrent detection is 165% of that value, or 82.5 A Therefore, . For a full load of 25A per phase, and an rDS(ON) (Q2) of 4m , RISEN = 2k. The overcurrent trip point would be 165% of 25A, or ~ 41A per phase. The RISEN value can be adjusted to change the overcurrent trip point, but it is suggested to stay within 25% of nominal. Droop, Selection of RIN The average of the currents detected through the RISEN resistors is also steered to the FB pin. There is no DC return path connected to the FB pin except for RIN, so the average FIGURE 7. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM SHOWING CURRENT AND VOLTAGE SAMPLING CURRENT SENSING COMPARATOR PWM CIRCUIT AVERAGING CURRENT FROM OTHER CHANNELS SAWTOOTH GENERATOR + DIFFERENCE RISEN + CORRECTION ERROR AMPLIFIER FB COMP REFERENCE TO OTHER CHANNELS ISEN RIN RFB Cc VCORE Q1 Q2 COMPARATOR REFERENCE TO OVER CURRENT TRIP L01 PHASE INDUCTOR CURRENT(S) FROM OTHER CHANNELS PWM IL DAC HIP6301 VIN ONLY ONE OUTPUT HIP6601B - - STAGE SHOWN - + SENSING - + - + IL rDS ON Q2 RISEN ------------------------------------ = RISEN IL rDS ON Q2 50 A ---------------------------------------------- = |
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