Datenblatt-Suchmaschine für elektronische Bauteile |
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ISL6121HEVAL1 Datenblatt(PDF) 7 Page - Intersil Corporation |
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ISL6121HEVAL1 Datenblatt(HTML) 7 Page - Intersil Corporation |
7 / 11 page 7 FN9004.2 November 12, 2004 Using the ISL6121EVAL1 Platform General and Biasing Information The ISL6121EVAL1 platform, Figure 17, allows evaluation of the ISL6121 power supply control IC and comparison against a suitably sized (1.85A hold current rating) PPTC component. The evaluation platform is biased and monitored through numerous test points (TP#). See Table 1 for test point assignments and descriptions. Upon proper bias the PPTC, F1, has a nominal 1.5A load current passing through it which is the below the hold current rating for that particular device. Removal of the PPTC is necessary to isolate the ISL6121 as the PPTC load current is common to the ISL6121EVAL1 bias connections. By enabling the ISL6121H switches by signaling TP4 high (> 2.4V) the IC is also loaded with a nominal 1.5A current. Provided test points enable the evaluation of voltage loss across the PPTC (TP9 - TP10) and likewise across the ISL6121 enabled switch (TP9 - TP6). Expect to see 10% - 30% greater voltage loss across the PPTC than the ISL6121. An Overcurrent (OC) condition can be invoked on both the ISL6121 and the PPTC by driving TP11 to +6V, causing SW1 to close and a nominal 3A load is imposed on each. This represents a current overload to the ISL6121 and is thus quickly current regulated to the 2A limit. If the OC duration extends beyond the nominal 12ms of the internal ISL6121 timer then the output is latched off and the fault output is asserted by being pulled low, turning on the FAULT_ LED. The primary function of any OC protection device is to quickly isolate the voltage bus from a faulty load. Unlike the PPTC and some other vendor available IC products, the ISL6121 internal timer that starts upon OC detection provides consistent protection that is independent of temperature. Figures 14 through 16 illustrate the comparative efficiency and effectiveness of the ISL6121 vs the PPTC in protecting and isolating a faulty load capable from drooping the system bus in that system. TABLE 1. ISL6121EVAL1 TEST POINT ASSIGNMENTS TP # DESCRIPTION TP1 Eval Board and IC GND TP2 Eval Board +5V Bias TP4 Enable TP5 Fault TP6 VOUT TP9 IC VIN Pin TP10 PPTC Load Side TP11 Invoke Over Current FIGURE 14. ISL6121 vs PPTC INTO 3.3 Ω LOAD FIGURE 15. ISL6121 vs PPTC INTO 1.6 Ω LOAD VIN = 5.07V ISL6121 VOUT = 5V PPTC VOUT = 4.96V VOUT (100mV/DIV.) PPTC VOUT ISL6121 VOUT 12ms OC LATCH-OFF TIME VOUT (1V/DIV.) TIME (2ms/DIV.) ISL6121 |
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