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ISL6115CBZA 데이터시트(PDF) 5 Page - Intersil Corporation |
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ISL6115CBZA 데이터시트(HTML) 5 Page - Intersil Corporation |
5 / 13 page 5 FN9100.7 April 29, 2010 Description and Operation The members of this IC family are single power supply distribution controllers for generic hot swap applications across the +2.5V to +12V supply range. The ISL6115 is targeted for +12V switching applications whereas the ISL6116 is targeted for +5V, the ISL6117 for +3.3V and the ISL6120 for +2.5V applications. Each IC has a hardwired undervoltage (UV) threshold level approximately 17% lower than the stated voltages. These ICs feature a highly accurate programmable current regulation (CR) level with programmable time delay to latch-off, and programmable soft-start turnHon ramp all set with a minimum of external passive components. The ICs also include severe OC protection that immediately shuts down the MOSFET switch should a rapid load current transient such as with a dead short cause the CR Vth to exceed the programmed level by 150mV. Additionally, the ICs have a UV indicator and an OC latch indicator. The functionality of the PGOOD feature is enabled once the IC is biased, monitoring and reporting any UV condition on the ISEN pin. Upon initial power-up, the IC can either isolate the voltage supply from the load by holding the external N-Channel MOSFET switch off or apply the supply rail voltage directly to the load for true hot swap capability. The PWRON pin must be pulled low for the device to isolate the power supply from the load by holding the external N-Channel MOSFET off. With the PWRON pin held high or floating the IC will be in true hot swap mode. In both cases the IC turns on in a soft-start mode protecting the supply rail from sudden in-rush current. At turn-on, the external gate capacitor of the N- Channel MOSFET is charged with a 10µA current source resulting in a programmable ramp (soft-start turn-on). The internal ISL6115 charge pump supplies the gate drive for the 12V supply switch driving that gate to ~VDD +5V, for the other three ICs the gate drive voltage is limited to the chip bias voltage, VDD. Load current passes through the external current sense resistor. When the voltage across the sense resistor exceeds the user programmed CR voltage threshold value, (see Table 1 for RISET programming resistor value and resulting nominal current regulation threshold voltage, VCR) the controller enters its current regulation mode. At this time, the time-out capacitor, on CTIM pin is charged with a 20µA current source and the controller enters the current limit time to latch-off period. The length of the current limit time to latch-off duration is set by the value of a single external capacitor (see Table 2) for CTIM capacitor value and resulting nominal current limited time-out to latch-off duration placed from the CTIM pin (pin 6) to ground. The programmed current level is held until either the OC event passes or the time-out period expires. If the former is the case then the N-Channel MOSFET is fully enhanced and the CTIM capacitor is discharged. Once CTIM charges to 1.87V signaling that the time-out period has expired, an internal latch is set whereby the FET gate is quickly pulled to 0V turning off the N-Channel MOSFET switch, isolating the faulty load. PWRON Pull-Up Voltage PWRN_V PWRON Pin Open 2.7 3.2 - V PWRON Rising Threshold PWR_Vth 1.4 1.7 2.0 V PWRON Hysteresis PWR_hys 130 170 250 mV PWRON Pull-Up Current PWRN_I 9 17 25 µA CURRENT REGULATION DURATION/POWER GOOD CTIM Charging Current CTIM_ichg0 VCTIM = 0V 16 20 23 µA CTIM Fault Pull-Up Current (Note 6) - 20 - mA Current Limit Time-Out Threshold Voltage CTIM_Vth CTIM Voltage 1.3 1.8 2.3 V Power Good Pull Down Current PG_Ipd VOUT = 0.5V - 8 - mA NOTES: 6. Limits established by characterization and are not production tested. 7. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Electrical Specifications VDD = 12V, TA = TJ = 0°C to +85°C, Unless Otherwise Specified. Temperature limits established by characterization and are not production tested. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued) PARAMETER SYMBOL TEST CONDITIONS MIN (Note 7) TYP MAX (Note 7) UNITS ISL6115, ISL6116, ISL6117, ISL6120 |
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