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ADM1041A Datasheet(PDF) 24 Page - Analog Devices

Part # ADM1041A
Description  Secondary-Side Controller with Current Share and Housekeeping
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADM1041A Datasheet(HTML) 24 Page - Analog Devices

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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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