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ICL7665SACPAZ Datasheet(PDF) 9 Page - Intersil Corporation |
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ICL7665SACPAZ Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 14 page ![]() 9 FN3182.8 April 5, 2006 Applications Single Supply Fault Monitor Figure 12 shows an over/under voltage fault monitor for a single supply. The overvoltage trip point is centered around 5.5V and the undervoltage trip point is centered around 4.5V. Both have some hysteresis to prevent erratic output ON and OFF conditions. The two outputs are connected in a wired OR configuration with a pullup resistor to generate a power OK signal. Multiple Supply Fault Monitor The ICL7665S can simultaneously monitor several supplies when connected as shown in Figure 13. The resistors are chosen such that the sum of the currents through R21A, R21B, and R31 is equal to the current through R11 when the two input voltage are at the desired low voltage detection point. The current through R11 at this point is equal to 1.3V/R11. The voltage at the VSET input depends on the voltage of both supplies being monitored. The trip voltage of one supply while the other supply is at the nominal voltage will be different that the trip voltage when both supplies are below their nominal voltages. The other side of the ICL7665S can be used to detect the absence of negative supplies. The trip points for OUT1 depend on both the negative supply voltages and the actual voltage of the +5V supply. TABLE 1. SET-POINT EQUATIONS NO HYSTERESIS Overvoltage VTRIP = R11 + R21 R11 x VSET1 Overvoltage VTRIP = R12 + R22 R12 x VSET2 HYSTERESIS PER FIGURE 10A VU1 = R11 + R21 + R31 R11 x VSET1 Overvoltage VTRIP VL1 = R11 + R21 R11 x VSET1 VU2 = R12 + R22 + R32 R12 x VSET2 Undervoltage VTRIP VL2 = R12 + R22 R12 x VSET2 HYSTERESIS PER FIGURE 11 VU1 = R11 + R21 R11 x VSET1 Overvoltage VTRIP VL1 = R11 + R21R31 R21 + R31 x VSET1 R11 VU2 = R12 + R22 R12 x VSET2 Overvoltage VTRIP VL2 = R12 + R22R32 R22 + R32 x VSET2 R12 OUT1 SET1 SET2 OUT2 V+ R21 RP VIN RP R22 R11 R12 HYST1 HYST2 R31 R32 FIGURE 11. AN ALTERNATIVE HYSTERESIS CIRCUIT HYST1 VSET1 VSET2 HYST2 V+ OUT1 OUT2 324k Ω 13M Ω 5% 100k Ω 249k Ω 7.5M Ω 5% +5V SUPPLY POWER OK 100k Ω 1M Ω V+ OPEN VOLTAGE DETECTOR VU = 5.55V VL = 5.45V OPEN VOLTAGE DETECTOR VU = 4.55V VL = 4.45V R22 R32 R31 R21 FIGURE 12. FAULT MONITOR FOR A SINGLE SUPPLY ICL7665S |
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