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MAX16008TP+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX16008TP+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 14 page Low-Voltage, High-Accuracy, Quad Window Voltage Detectors in Thin QFN 10 ______________________________________________________________________________________ Use the following formulas to calculate the error: where EUV and EOV are the undervoltage and over- voltage error (in %), respectively. 2) Calculate R3 based on RTOTAL and the desired upper trip point: 3) Calculate R2 based on RTOTAL, R3, and the desired lower trip point: 4) Calculate R1 based on RTOTAL, R3, and R2: Overvoltage Shutdown The MAX16008/MAX16009 are ideal for overvoltage- shutdown applications. Figure 3 shows a typical circuit for this application using a pass p-channel MOSFET. The MAX16008/MAX16009 are powered directly from the system voltage supply. Select R1 and R2 to set the trip voltage. When the supply voltage remains below the selected threshold, a low logic level on UVOUT_ turns on the p-channel MOSFET. In the case of an overvolt- age event, UVOUT_ goes high turning off the MOSFET, and shuts down the power to the load. Figure 4 shows a similar application using a fuse and a silicon-controlled rectifier (SCR). An overvoltage event turns on the SCR and shorts the supply to ground. The surge of current through the short circuit blows the fuse and terminates the current to the load. Select R3 so that the gate of the SCR is properly biased when UVOUT_ goes high. Unused Inputs Any unused UVIN_ inputs must be connected to VCC, and any unused OVIN_ inputs must be connected to GND. UVOUT_/OVOUT_ Outputs UVOUT_ and OVOUT_ outputs assert low when UVIN_ and OVIN_, respectively, drop below or exceed their specified thresholds. The undervoltage/overvoltage out- puts are open-drain with a (30µA) internal pullup to VCC. For many applications, no external pullup resistor is required to interface with other logic devices. An external pullup resistor to any voltage up to 5.5V overdrives the internal pullup if interfacing to different logic supply volt- ages. Internal circuitry prevents reverse current flow from the external pullup voltage to VCC (Figure 5). When choosing the external pullup resistor, the resistance value should be large enough to ensure that the output can sink the necessary current during a logic-low condi- tion and small enough to be able to overdrive the internal pullup current and meet output high specifications RR R R TOTAL 12 3 =− − R Vx R V R TH TOTAL TRIPLOW 23 =− R Vx R V TH TOTAL TRIPHIGH 3 = E IR RR RR V x E IR x R V x UV IB TRIPLOW OV IB TRIPHIGH (%) (%) (( )) = + + ⎛ ⎝⎜ ⎞ ⎠⎟ = + 1 13 23 21 100 2 100 VCC LOAD UVIN_ R1 R2 UVOUT_ MAX16008/ MAX16009 GND R3* VSUPPLY *OPTIONAL. VALUES OF 10k Ω AND ABOVE ARE RECOMMENDED. Figure 3. Overvoltage Shutdown Circuit (with External Pass MOSFET) VCC LOAD SCR UVIN_ R1 R2 R3 UVOUT_ MAX16008/ MAX16009 GND FUSE VSUPPLY Figure 4. Overvoltage Shutdown Circuit (with SCR Fuse) |
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