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ISL6132 Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL6132 Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 13 page 7 FN9119.3 July 22, 2005 Applications Usage Using the ISL613XSUPEREVAL2 Platform The ISL613XSUPEREVAL2 platform is the primary evaluation board for this family of supervisors and is designed to support the ISL6131, ISL6132. In addition, it also supports the ISL6125 sequencer as it has open drain RESET# outputs similar to the STATUS outputs of the ISL6131 and ISL6132. The ISL613XSUPEREVAL2 is shipped with a ISL6125 soldered into the SMD channel 2 position and with 2 each of the ISL6131 (1 socketed) and ISL6132 loose packed. The four resistor divider strings are set so that VMON = VMON Vth (0.633V) once supplies are 2.10V on the IN_D, 1.27V on IN_C, 4.27V on IN_B and 2.78V on IN_A. On the ISL6131 these are the 4 UV levels at ~85% of 2.5V, 1.5V, 5V and 3.3V respectively. LEDs turned off are the PGOOD high indicators with D4 being the ISL6131 indicator. With VDD ranging from 1.5V to 5V or shorted to IN_A through JP1 and with an ISL6131 in the socket, PGOOD will release to be pulled high once those minimum conditions are met. See Figures 10 to 17 for performance and function examples. With the ISL6132 in the socket and IN_C and IN_D tied to a common supply and IN_A and IN_B tied to a second supply the ISL6132 will look for a voltage between 1.27V to 2.10V on the CD pair and between 2.78V and 4.27V for the AB pair. Once either supply meets its requirement the related PGOOD will release to pull high and turn off the related LED. See Figures 18 to 24 for performance and function examples. Figures 25 and 26 illustrate the ISL613XSUPEREVAL2 platform in image and schematic. Using the ISL6131, ISL6132 for Negative Voltage Monitoring Applications The ISL6131, ISL6132 can be used for -V monitoring as it monitors any voltage more positive relative to its GND pin. With correct bias differential these parts can monitor any voltage regardless of polarity or amplitude. Using the ISL6131 for ‘Loss Less’ Sequencing Applications The ISL6131 can be used in a ‘loss less’ sequencing application where a monitored output voltage determines the start of the next sequenced turn-on. As shown in Figure 7, VMON_A input looks at the common VIn of several DC-DC converters and enables DC-DC_A with STATUS _A, once both VIn and ENABLE are satisfied. VMON_B monitors the output of DC-DC_A and when the acceptable output voltage is reached, DC-DC_B is enabled with STATUS_B output. This sequencing pattern is continued until all DC-DC outputs are on, at which time PGOOD signal will be released to indicate. 160ms delay from VMON > VVMONVth to STATUS high ensures stability at each step prior to subsequent turn- on. Additional ISL6131s can be employed in parallel to sequence any number of DC-DC convertors is in this fashion. Using the ISL6131 for System Voltage and Over Temperature Monitoring Being a multivoltage monitoring IC the ISL6131 can also be used to monitor over temperature as well as voltage for a more complete coverage of system health. Using a Negative Temperature Coefficient (NTC) passive device in place of one of the resistors in a VMON divider provides over temperature monitoring either locally or remotely. Evaluations of this application configuration have involved the QT0805T-202J, QT0805Y-502J and QT0805Y-103J NTCs from Quality Thermistor. ISL6131 over temperature monitoring is not as accurate as specific temperature monitor ICs but this implementation provides a cost efficient solution with 5% tolerances achievable. See Figures 8 - 9 for over temp sensing configuration and operation results. In this example, the desired maximum temp is 100°C. The QT0805Y-103J NTC was placed at the end of 3 feet of twisted pair wire to emulate a remote sensing application. From the Quality Thermistor data sheet, this NTC device has a +25°C value of 10K and at +100°C a value of 0.923K. An accompanying standard value resistor of 3.83K was chosen for divider so that at 100°C, VMON ~0.633V with the bias voltage at 3.3V. FIGURE 7. ISL6131 ‘LOSSLESS’ SEQUENCING CONFIGURATION DC-DC_A VIN VOUT EN VIN VIN VOUT VOUT EN EN DC-DC_B DC-DC_C VMON_A VMON_D VMON_C VMON_B ABC STATUS PGOOD GND VDD ENABLE ISL6131 ISL6131, ISL6132 |
Similar Part No. - ISL6132 |
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Similar Description - ISL6132 |
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