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MIC21LV32 Datasheet(PDF) 29 Page - Microchip Technology |
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MIC21LV32 Datasheet(HTML) 29 Page - Microchip Technology |
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29 / 50 page  2021 Microchip Technology Inc. DS20006513A-page 29 MIC21LV32 FIGURE 4-17: Use of an NTC Resistance to Compensate the RDSON Temperature Coefficient on the DROOP Pin. The idea in Figure 4-14 is that increasing DROOP volt- age with temperature at the IOUT(MAX) (positive tem- perature coefficient) is compensated by the RNTC (negative temperature coefficient) to keep the node of the divider, Div_DROOP_ZeroTC, constant versus temperature. The rest of the calculations are similar to the afore- mentioned case where the sensing current was temperature-insensitive. In case the AVP is not necessary, a 10 kΩ, 1 nF RC filter to ground can be used to have a reading of the filtered output current. 4.5.10 MULTIPHASING (STACKING) The MIC21LV32 can be configured for multiphase operation up to eight phases. The MIC21LV32 has four pins allocated for multiphasing. The APO pin of the host controller is connected to the NPI pin of the next secondary controller. The host and secondary CSH, ONR pins are connected together. Once the host finishes the on requests, it passes the control to the next secondary through the APO pin. The current share bus will maintain equal current sharing between host and secondary controllers. The ONR is a bidirectional pin. The desired secondary controller’s FBS pin is connected to VDD to program the controller as secondary. This will make the ONR pin of the secondary controller become input only. Second- ary controllers accept ONR from the host controller and serve the on-time request. Figure 4-18 shows two MIC21LV32 devices connected in a 4-phase configuration. The NPI and APO pins of the MIC21LV32 are connected in a daisy chain to form a stackable power supply up to eight phases. FIGURE 4-18: MIC21LV32 Connected in 4-Phase Configuration. In order to get a stricter control over behavior if one member of the daisy chain is damaged or going to be damaged, or is in short or thermal shutdown, several measures were implemented. 1. The host is the only one programming the ILIM. The secondaries are just reading the voltage on ILIM; as a common point, they do not have any programming current coming out. 2. The soft start pin is driven up with 1.2 µA from all members of the daisy chain. When any of the members of the daisy chain pulls down the SS pin in case of thermal shutdown, or short circuits more than seven cycles, a new automatic restart is triggered on the falling edge of SS. Any of the daisy chain members can keep low closed to 0 in the SS pin, and in that case, all members are in High-Z and wait until SS is released to go up. To illustrate if one member has the LDO not coming up, this will keep the SS pin in low. MIC21LV32 FBS RFBB1 DROOP VOUT RINJ CINJ RIP_INJ GFB RDROOP RFBB2 RFBT CFF RS RP RNTC Div_DROOP_Z eroTC RBIAS MIC21LV32 Host CSH ONR APO NPI FBS GFB RIP_INJ MIC21LV32 Secondary CSH ONR APO NPI FBS GFB RIP_INJ SS VOUT VDD SS DH1 SW1 DL1 DH2 SW2 DL2 DH1 SW1 DL1 DH2 SW2 DL2 ILIM ILIM |
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