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ADM1041A Datasheet(PDF) 24 Page - Analog Devices |
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ADM1041A Datasheet(HTML) 24 Page - Analog Devices |
24 / 56 page ADM1041A Rev. 0 | Page 24 of 56 PULSE/ACSENSE2 When configured, PULSE and ACSENSE monitor the output of the power main transformer. See Figure 16. PULSE Providing the output of the pulse function (PULSE_OK) is high, the FET in the OR’ing circuit can be turned on. If the pulses stop for any reason, about 1 second later the PULSE_OK goes low and the OrFET drive is disabled. This delay allows passage of all expected pulse skipping modes that might occur in no load or very light load situations. See Figure 16. ACSENSE This is rarely used to measure the ac input to the supply directly. ACSENSE1 or ACSENSE2 are usually used to measure, indirectly, the voltage across the bulk capacitor so that the system can be signaled that power is normal. Also if power is actually lost, ACSENSE represents when just enough energy is left for an orderly shutdown of the power supply. See Figure 16. The ac sense function monitors the amplitude of the incoming pulse and, if sufficiently high, generates a flag to indicate that the ac, or strictly speaking, the voltage on the bulk capacitor, is okay. Because the envelope of the pulse has a considerable amount of 100 Hz ripple, hysteresis is available on this input pin. Internally there is a 20 μA to 80 μA current sink. With a 909R external Thevenin resistance, this current range translates to a voltage hysteresis of 200 mV to 500 mV. The internal hysteresis current is turned off when the voltage exceeds the reference on the comparator. This form of hysteresis allows simple scaling to be implemented by changing the source impedance of the pulse-conditioning circuit. Some trimming of hysteresis and threshold voltage is provided. The ac sense function can be configured to be derived from ACSENSE2 rather than ACSENSE1. This allows a separate dc input from various locations to be used to generate AC_OK for better flexibility or accuracy. AC_OK 1.5V 0.525V PULSE ACSENSE1 ACSENSE2 SELECT ACSENSE 5.3k Ω 5.3k Ω TRIM HYSTERESIS PULSEOK TO OrFET SOURCE TO CURRENT- SENSE RESISTOR AND OrFET GATE S Q R S Q R CLK 1 SEC Q R 10 9 CLK 1 mS Q R Figure 16. Pulse In and ACSENSE Circuit |
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