Datasheet

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INA206
x20
12V Supply
12V Load
Shutdown
Warning
3.3V Supply
V
S
OUT
CMP1 IN+
CMP2 IN–
CMP2 IN+/0.6 REF
GND
V
IN+
V
IN–
1.2V REF OUT
CMP1 OUT
CMP2 OUT
CMP2 DELAY
CMP1
RESET
2.5V Reference
1.2V REF
CMP1IN–/0.6REF
R
3m
SHUNT
W
C
0.1 F
(0.5s)
DELAY
m
COMPARATOR MAXIMUM INPUT VOLTAGE
20kW 20kW
CMP2 IN+
CMP1 IN–
1.2V
i 1mA£
INA206
x20
Load
5V Supply
V
S
OUT
CMP1 IN+
CMP2 IN–
CMP2 IN+/0.6 REF
GND
1.2V REF OUT
CMP1 OUT
CMP2 OUT
CMP2 DELAY
CMP1
RESET
1.2V REF
Transparent/Reset
Latch
V < 11.2V
LoadSupply
–18Vto+80V
Current Shunt
Monitor Output
CMP1IN–/0.6REF
C
0.01 F
BYPASS
m
V
IN+
V
IN–
R
SHUNT
R
4.7k
PULL-UP
W
R
4.7k
PULL-UP
W
Optional Delay
Capacitor
0.2 Fm
INA206
INA207
INA208
SBOS360E – JUNE 2006 – REVISED OCTOBER 2007
Figure 36. Server 12V Supply Current Monitor
It is important to note what will happen if events occur limit the voltage on both inputs to a total of 20V. The
more rapidly than the delay timeout; for example, exact limit depends on the available voltage and
when the U1 output goes high (turning on I2), but whether either or both inputs are subject to the large
returns low (turning I1 back on) prior to reaching the voltage. When making this determination, consider
0.6V transition for U2. The voltage at U2 +IN ramps the 20k Ω from each input back to the comparator.
back down at a rate determined by the value of Figure 38 shows the maximum input voltage that
C
DELAY
, and only returns to zero if given sufficient avoids creating a reference error when driving both
time. inputs (an equivalent resistance back into the
reference of 10k Ω ).
In essence, when analyzing Comparator 2 for
behavior with events more rapid than its delay
setting, use the model shown in Figure 34 .
RANGE
The maximum voltage at the comparator input for
normal operation is up to (V+) – 1.5V. There are
special considerations when overdriving the reference
inputs (pins 3 and 6). Driving either or both inputs
high enough to drive 1mA back into the reference
introduces errors into the reference. Figure 37 shows
Figure 37. Limit Current Into Reference ≤ 1mA
the basic input structure. A general guideline is to
Figure 38. Overdriving Comparator Inputs Without Generating a Reference Error
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