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ADM1270 Datasheet(PDF) 20 Page - Analog Devices

Part No. ADM1270
Description  High Voltage Input Protection Device
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM1270 Datasheet(HTML) 20 Page - Analog Devices

 
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ADM1270
Data Sheet
Rev. A | Page 20 of 21
POWER GOOD
The power-good (PWRGD) output can be used to indicate
whether the output voltage exceeds a user defined threshold
and can, therefore, be considered good. The PWRGD output
is set by a resistor divider connected to the FB_PG pin (see
Figure 42).
40×
+
VCC/SENSE+
SENSE–
GATE
GND
LDO
GATE DRIVE/
LOGIC
VCAP
RSENSE
Q1
FB_PG
4V TO 60V
+
+
UV
1V
1V
OV
Figure 42. Generation of PWRGD Signal
When the voltage at the FB_PG pin exceeds the 1 V threshold
(indicating that the output voltage has risen), the open-drain
pull-down current is disabled, allowing PWRGD to be pulled
high. The PWRGD pin is an open-drain output that pulls low
when the voltage at the FB_PG pin is lower than the 1 V
threshold minus the hysteresis (power bad). Hysteresis on the
FB_PG pin is fixed at 30 mV. PWRGD is guaranteed to be in a
valid state for VCC ≥ 1.7 V.
Calculate the power-good threshold using the following
equation:
VPWRGD = 1 V × (1 + RPG1/RPG2)
where:
RPG1 is the resistance from VOUT to FB_PG.
RPG2 is the resistance from FB_PG to GND.


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