Absolute maximum ratings, Pin out information, Recommended operating conditions – Diodes ZXCT1020 User Manual
Page 2: Recommended resistor gain setting combinations, Zxct1020
ZXCT1020
© Zetex Semiconductors plc 2007
Absolute maximum ratings
NOTES:
(a) Subject to V
SENSE
+ never going 6V below V
B
.
(b) Subject to absolute maximum V
SENSE
not being exceeded.
(c) V
SENSE
is defined as the voltage difference across the sense resistor. and is the voltage across resistor R
SH
plus the
voltage between S+ and S-.
(d) V
SENSE
might need to be reduced when used with smaller values of R
SH
and at larger rails due to increased power dissipation.
Pin out information
Recommended operating conditions
Recommended resistor gain setting combinations
Voltage on V
B
with respect to GND pin
-0.5V to 20V
Voltage on S+
, OUT with respect to GND pin
-0.5V to V
B
+0.5V
V
SENSE
-0.5V to +2.5V
Junction temperature
-40°C to125°C
Storage temperature
-55°C to 150°C
Package power dissipation (T
amb
= 25°C) SOT23-5
300mW
Pin
Name
Pin function
1
S+
Positive sense input. Should be tied to positive side of sense resistor via
resistance (R
SH
) of the order of 150
⍀ to 1.5k⍀.
2
GND
Ground and substrate connection of device.
3
OUT
Current output. A gain setting resistor (R
G
) referenced to GND should be
connected to this pin to set overall voltage gain of:
Gain = R
G
/R
SH
The resistance, R
G
, placed on out will set the ZXCT1020 output impedance equal
to R
G
. When driving low impedance loads both R
G
and R
SH
should be reduced.
4
V
B
Input voltage pin. Provides bias to current monitor and should be tied to the
rail whose current is being monitored.
5
S-
High impedance negative sense voltage input
Parameter
Min.
Max.
Units
V
SENSE+
Common-mode sense input range
2.5
20
V
V
B
Bias pin input voltage range
(*)
NOTES:
(*) For best performance V
B
and V
SENSE+
should be referred to the rail whose current is being measured.
2.5
20
V
V
SENSE
Differential sense Input voltage range
0
1.5
V
V
OUT
Output voltage range
0
V
SENSE-
- 1
V
R
SH
Shunt resistor value
120
2000
⍀
T
A
Ambient temperature range
-40
85
°C
Gain
R
SHUNT
R
GAIN
10
1.5k
⍀
15k
⍀
20
750
⍀
15k
⍀
50
300
⍀
15k
⍀
100
150
⍀
15k
⍀