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PIFE32251B-R68MS Scheda tecnica(PDF) 135 Page - Texas Instruments |
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PIFE32251B-R68MS Scheda tecnica(HTML) 135 Page - Texas Instruments |
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135 / 157 page  4 1 = 4 2 × l 8 +0 8 6DNAO DKH@ F 1 p TPS65083x R1a R2a R2b R1b R1c R2c Adaptor Battery 1 Battery 2 Pull Up Pull Up Pull Up ACOUT BAT1OUT BAT2OUT ACIN BAT1IN BAT2IN VINPP Copyright © 2016, Texas Instruments Incorporated 135 TPS650830 www.ti.com SLVSCF4A – DECEMBER 2014 – REVISED JULY 2016 Submit Documentation Feedback Product Folder Links: TPS650830 Application and Implementation Copyright © 2014–2016, Texas Instruments Incorporated The thermistors should have low room and mid temperature resistances in the range of 1 kΩ to 10 kΩ. The hot point resistance should be roughly 10x mid temperature resistance in the range of 100 kΩ to 200 kΩ. There is an internal 10-µA current source that provides a voltage across the thermistors. Once this voltage exceeds the comparator threshold of 1.25 V the TRIPZ pin switches to LOW indicating a HOT board temperature. Therefore, the resistance required for HOT board temperature is 125 kΩ. Select thermistors that align this resistance with the desired HOT temperature setpoint. The recommended thermistors for this feature is the muRata PRF15BG102RB6RC. 7.2.2.5 Power Path Design Procedure The TPS65083x has power path comparators and outputs to control the power path switches. Simply connect a voltage divider to the adaptor and batteries to set the threshold to the desired value. The outputs of the comparators require a pull up since they are open-drain outputs. In-order for the power path comparators to work without VIN supplied connect the VINPP to the power rails that are being monitored by using a diode to select the highest voltage among the sources. Figure 7-6. Power Path Comparators and VINPP Supply Example: Desired is to measure a battery and an adaptor to decide when to switch over from battery to adaptor. The voltages desired for thresholds are 9 V and 6 V respectively. Using Equation 8 the resistors required to set the 9-V threshold are R1a = and R2a = . The resistors required to set the 6-V threshold are R1b = and R2b = . (8) |
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