TSC102 STMicroelectronics, TSC102 Datasheet - Page 12

• Manufacturer Part Number: TSC102
• Description: High side current sense amplifier plus signal conditioning amplifier
• Manufacturer: STMicroelectronics

Specifications of TSC102

• Wide Common-mode Operating Range: 2.8 to 30 V
• Wide Common-mode Surviving Range: -16 to 60 V (reversed battery and load-dump conditions)
• Low Current Consumption: ICC max = 420 μA

Parameter definitions
6
6.1
6.2
6.3
12/24
Parameter definitions
Common-mode rejection ratio (CMR)
The common-mode rejection ratio (CMR) measures the ability of the current sensing
amplifier to reject any DC voltage applied on both inputs V
back to the input so that its effect can be compared with the applied differential signal. The
CMR is defined by the formula:
Supply voltage rejection ratio (SVR)
The supply voltage rejection ratio (SVR) measures the ability of the current sensing amplifier
to reject any variation of the supply voltage V
that its effect can be compared with the applied differential signal. The SVR is defined by the
formula:
Gain (Av) and input offset voltage (V
The input offset voltage is defined as the intersection between the linear regression of the
V
V
V
The amplification gain Av is defined as the ratio between the output voltage and the input
differential voltage.
a1
os
sense
can be calculated with the formula:
versus V
= V
sense1
sense
= 50 mV and V
curve with the X-axis (see
V
os
=
SVR
CMR
V
sense1
Doc ID 16754 Rev 2
a12
=
=
–
Av
–
–
20
is the output voltage with V
20
⎛
⎝
V
----------------------------------------------- -
⋅
=
sense1
⋅
log
V
----------------- -
V
log
V
a11
sense
---------------------------
ΔV
out
------------------------------
ΔV
Figure
–
–
CC
ΔV
cc
V
V
icm
ΔV
. The SVR is referred back to the input so
⋅
sense2
a12
a1
a1
⋅
Av
Av
18). If V
⋅
os
V
)
out1
p
a11
and V
⎞
⎠
sense
is the output voltage with
m
. The CMR is referred
= V
sense2
= 5 mV, then
TSC102