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Data Sheet
–48V RTN
VIN
ADM1075
Rb1 = 100k?
Rb2 = 640?
ADM1075
Q1
GATE
18V
TO
C IN
Ib = 6μA TO 33μA
75V
11V
10.3V (5.5mA)
–48V
1μF
R DROP = 15?
VIN
C LOAD
BIAS
CURRENT
SENSE+
SENSE–
VEE
VEE
ADM1075
GATE
SENSE+
Q 1
R SENSE
Figure 45. Connection of Multiple Sense Resistors to SENSE± Pins
CURRENT LIMIT REFERENCE
SENSE–
VEE
Figure 43. Wide Input Supply Range
CURRENT SENSE INPUTS
The load current is monitored by measuring the voltage drop
across an external sense resistor, R SENSE . An internal current
sense amplifier provides a gain of 25 or 50 (depending on the
model) to the voltage drop detected across R SENSE . The result is
compared to an internal reference and detects when an
overcurrent condition occurs.
VIN
The current limit reference voltage determines the load current
level to which the ADM1075 limits the current during an
overcurrent event. This is the reference voltage to which the
gained up current sense voltage is compared to determine if the
limit is reached. This current limit voltage, shown in Figure 46,
is then converted to a gate current to regulate the GATE pin.
I GATE = V CURR _ LIM × g m
where g m , the gate transconductance, = 660 μS.
An internal current limit reference selector block continuously
compares the ISET, soft start, and foldback (derived from PLIM)
voltages, determines which is the lowest at any given time, and
uses it as the current limit reference. This ensures that the
ADM1075
OVER-
GATE
Q1
programmed current limit, ISET, is used in normal operation
and the soft start and foldback features reduce the current limit
when required.
CURRENT
+
–
1V REF
VEE
×25/50
–
SENSE+
SENSE–
R SENSE
The foldback and soft start voltages change during different
stages of operation and are clamped to a lower level of 100 mV
(typical) to prevent zero current flow due to the current limit
being too low.
Figure 44. Hot-Swap Current Sense Amplifier
The SENSE± inputs can be connected to multiple parallel sense
resistors, which can affect the voltage drop detected by the
ADM1075 . The current flowing through the sense resistors
creates an offset, resulting in reduced accuracy. To achieve
better accuracy, averaging resistors should be used to sum the
sense nodes of each sense resistor, as shown in Figure 45. The
typical value for the averaging resistors is 10 ?. The value of the
ISET
ADM1075
REF
SELECT
1.0V
VCAP
CURRENT
LIMIT
VOLTAGE
–
GATE
DRIVE
LOGIC
TIMEOUT
+
PLIM
GATE
averaging resistors is chosen to be much greater than the trace
resistance between the sense resistor terminals and the inputs to
the ADM1075 . This greatly reduces the effects of differences in
the trace resistances.
CURRENT
LIMIT
10μA
CURRENT
LIMIT
CONTROL
FLB
+
×25/50
–
SENSE+
SENSE–
( = 0.1/PLIM)
SS
VEE
Figure 46. Current Limit Reference Selection
Rev. C | Page 21 of 52
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