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ADM1041
PULSE/AC SENSE 2
When configured, PULSE and AC SENSE 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 ORing 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.
AC SENSE
This is rarely used to measure directly the ac input to the supply.
AC SENSE 1 or AC SENSE 2 are usually used to indirectly measure the
The ac sense function monitors the amplitude of the incoming
pulse and, if sufficiently high, generates a flag to indicate ac, or
strictly speaking, the voltage on the bulk capacitor, is okay. Since
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 AC SENSE 2 rather than AC SENSE 1. This allows a separate dc
input from various locations to be used to generate AC_OK for
better flexibility or accuracy.
voltage across the bulk capacitor so that the system can be
signaled that power is normal. Also if power is actually lost,
AC SENSE represents when just enough energy is left for an orderly
shutdown of the power supply. See Figure 16.
TO OrFET SOURCE
TO CURRENT
SENSE RESISTOR
AND OrFET GATE
0.525V
S
Q
PULSEOK
PULSE
AC SENSE 1
9
5.3k ?
R
CLK
1 SEC
Q
R
SELECT
AC SENSE
AC SENSE 2 10
5.3k ?
1.5V
S
Q
AC_OK
CLK
1 mS
R
TRIM
HYSTERESIS
Figure 16. Pulse In and AC Sense Circuit
Rev. A | Page 27 of 64
Q
R
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