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ISL6118HIBZA-T Datasheet(PDF) 7 Page - Intersil Corporation |
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ISL6118HIBZA-T Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 10 page 7 Using the ISL6118EVAL1 Platform Upon proper bias the PPTC, F1, has a nominal 400mA load current passing through it which is the hold current rating for that particular device. Removal of the PPTC is necessary to isolate the ISL6118 as the PPTC load current is common to the ISL6118EVAL1 bias connections. By enabling either or both of the ISL6118H switches by signaling TP3 and/or TP4 high (>2.4V) these switches are also loaded with a nominal 400mA current. Provided test points enable the evaluation of voltage loss across the PPTC (TP9 - TP10) and likewise across the ISL6118 enabled switches (TP9 - TP6 and TP7). Expect to see 100% - 300% greater voltage loss across the PPTC than the ISL6118 (see Figure 11 for ISL6118 vs PPTC voltage loss comparison). An overcurrent (OC) condition can be invoked on both the ISL6118 and the PPTC by driving TP11 to +6V, causing SW1 to close and a nominal 0.94mA load is imposed. This represents a current overload to the ISL6118 and is thus quickly current regulated to the 600mA limit. If the OC duration extends beyond the nominal 12ms of the internal ISL6118 timer then the output is latched off and the fault output is asserted by being pulled low turning on the appropriate FAULT LED. (Please note: the labeling for the FAULT-1 and FAULT-2 is reversed.) The eval board is designed to only invoke a OC condition on channel 2 (TP4) so that a channel to channel isolation evaluation in the presence of a OC condition can be evaluated. The primary function of any OC protection device is to quickly isolate the voltage bus from a faulty load. Unlike the PPTC and other vendor available IC products, the ISL6118 internal timer that starts upon OC detection provides consistent protection that is independent of temperature. Figures 11 through 13 illustrate the comparative efficiency and effectiveness of the ISL6118 vs the PPTC in protecting and isolating a faulty load capable from drooping the system bus in that system. FIGURE 11. ISL6118 vs PPTC INTO 8.2 Ω LOAD FIGURE 12. ISL6118 vs PPTC INTO 3.5 Ω LOAD FIGURE 13. ISL6118 vs PPTC WITH EXTENDED 3.5 Ω LOAD Typical Performance Curves (Continued) VOLTAGE (0.5V/DIV) VVIN 3.32V ISL6118 VOUT 3.29V (0.075 Ω) 0.4A HOLD CURRENT PPTC 2.93V (1.1 Ω) GND VOLTAGE (0.5V/DIV) TIME (4ms/DIV) VIN ISL6118 CR 12ms PERIOD 0.4A HOLD CURRENT PPTC OUT ISL6118 OUT VOLTAGE (0.5V/DIV) TIME (4s/DIV) ISL6118 OUT 0.4A HOLD CURRENT PPTC OUT VIN 2.3V AT 10s 1.5V AT 30s ISL6118 |
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