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ISL28915FH6Z-T7 Arkusz danych(PDF) 8 Page - Intersil Corporation |
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ISL28915FH6Z-T7 Arkusz danych(HTML) 8 Page - Intersil Corporation |
8 / 10 page ISL28915 8 July 12, 2012 FN8343.0 Applications Information Introduction The ISL28915 is a CMOS rail-to-rail input and output (RRIO) nanopower comparator. This device is designed to operate from single supply (1.8V to 5.5V) and have an input common mode range that extends to the positive rail and to the negative supply rail for true rail-to-rail performance. The CMOS output can swing within tens of millivolts to the rails. Featuring worst case maximum supply current of only 900nA, this comparator is ideally suited for solar and battery powered applications. Input Protection All input terminals have internal ESD protection diodes to both positive and negative supply rails, limiting the input voltage to within one diode beyond the supply rails. The ISL28915 has a maximum input differential voltage that extends beyond the rails (V+ + 0.5V to GND - 0.5V). Rail-to-Rail Output A pair of complementary MOSFET devices are used to achieve the rail-to-rail output swing. The NMOS sinks current to swing the output in the negative direction. The PMOS sources current to swing the output in the positive direction. The ISL28915 with a 10kΩ load will typically swing to within 10mV of the positive supply rail and within 35mV of ground. Break-Before-Make Operation of the Output The output circuit has a break-before-make response. This means that the P-Channel turns off before the N-Channel turns on during a high to low transition of the output (reference Figure 24). Likewise, the N-Channel turns off before the P-Channel turns on during a low to high transition. This results in different propagation delay times depending upon where the output load resistor is tied to. If the load resistor is tied to ground (Figure 25A), then the propagation delay is controlled by the P-Channel. For a high to low transition, the propagation delay does not include the additional break-before-make time because the load resistor will pull the output low once the P-Channel has turned off. During the low to high transition, however, if the load resistor is tied to ground, then the additional break-before-make time is added to the propagation delay time because the output won’t pull high until the P-Channel turns on. If the load resistor is tied to V+ (Figure 25B), then the propagation delay is controlled by the N-Channel. For this condition, the additional delay time is added to the high to low transition because the output won’t pull low until the N-Channel turns on. Figures 4 through 7 show the differences in propagation delay depending upon where the load is tied. Propagation Delay The input to output propagation delay has a dependency on power supply voltage, overdrive and whether the output is sourcing or sinking current. Figures 4 and 5 show a decreasing time propagation delay vs supply voltage for the ISL28915. The output break-before-make mechanism results in a difference in propagation delay, depending on whether the output stage NMOS and PMOS are sourcing or sinking current. This delay difference is shown in the figures as a function of where the load is terminated (V+ or GND) and also as a function of supply voltage. The dependence of propagation delay as a function of power supply voltage and input overdrive (from 5mV to 1V) is shown in Figures 6 and 7. Propagation delay is measured from the time the input signal reached 50% of its final value to the time the output reaches 50% of its final value. Rise and fall times are measured from the time the signal is at 20% of its final value to the time it reaches 80% of the final value. Enable Feature The ISL28915 in the 6 Ld SOT-23 package offers an EN pin that enables the device when pulled high. The enable threshold is referenced to the GND terminal and has a level proportional to the total supply voltage (reference Figure 9 for EN Threshold vs Supply Voltage). The enable circuit has a delay time that changes as a function of supply voltage. Figures 10 and 11 show the effect of supply voltage on the enable and disable times. The enable and disable delay is measured from the time the signal crosses the enable threshold to the time the output reaches 20% of its final value. For supply voltages less than 3V, it is recommended that the user account for the increased enable/disable delay time. VOUT V+ P-CHANNEL N-CHANNEL FIGURE 24. MAKE-BEFORE-BREAK ACTION OF THE OUTPUT STAGE ISL28915 OUTPUT STAGE BREAK-BEFORE-MAKE FIGURE 25A. RL TO GND FIGURE 25B. RL TO V+ FIGURE 25. CONNECTION OF RL TO GND AND V+ + - VOUT V+ RL + - VOUT V+ RL |
Podobny numer części - ISL28915FH6Z-T7 |
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Podobny opis - ISL28915FH6Z-T7 |
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