ST TSC102 User Manual
High-side current sense amplifier plus signal conditioning amplifier
p
Features
■ Independent supply and input common-mode
voltages
■ 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: I
■ Output amplifier for tailor-made signal
conditioning
■ -40 to 125° C operating temperature range
■ 4 kV ESD protection
Applications
■ Battery chargers
■ Automotive current monitoring
■ Notebook computers
■ DC motor control
■ Photovoltaic systems
■ Precision current sources
■ Uninterruptible power supplies
■ High-end power supplies
Description
The TSC102 measures a small differential voltage
on a high-side shunt resistor and translates it into
a ground-referenced output voltage.
The device’s wide input common-mode voltage
range, low quiescent current and tiny TSSOP8
packaging enable use in a wide variety of
applications (also available in SO-8 package).
The input common-mode and power supply
voltages are independent. The common-mode
voltage can range from 2.8 to 30 V in operating
conditions.
max = 420 µA
CC
TSC102
P
TSSOP8
(Plastic package)
D
SO-8
(Plastic package)
V
1
Vm
2
Gnd
3A1
4A2
Pin connections
(top view)
The TSC102 is rugged against abnormal
conditions on the input pins: Vp and Vm can
withstand up to 60 V in case of voltage spikes, as
little as -16 V in case of reversed battery, and up
to 4 kV in case of electrostatic discharge.
In addition to the current sensing amplifier, the
TSC102 offers a fully accessible amplifier for
output signal conditioning.
The device’s overall current consumption is lower
than 420 µA.
8
7 A3
Vcc
6
Out
5
March 2011 Doc ID 16754 Rev 2 1/24
www.st.com
24
Contents TSC102
Contents
1 Application schematic and pin description . . . . . . . . . . . . . . . . . . . . . . 3
2 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics curves: current sense amplifier . . . . . . . . . . 8
5 Electrical characteristics curves: signal conditioning amplifier . . . . 11
6 Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.1 Common-mode rejection ratio (CMR) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2 Supply voltage rejection ratio (SVR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6.3 Gain (Av) and input offset voltage (V
) . . . . . . . . . . . . . . . . . . . . . . . . . . 12
os
6.4 Output voltage drift versus temperature . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.5 Output voltage accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.1 SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.2 TSSOP-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
2/24 Doc ID 16754 Rev 2
TSC102 Application schematic and pin description
1 Application schematic and pin description
The TSC102 high-side current sense amplifier features a 2.8 to 30 V input common-mode
range that is independent of the supply voltage. The main advantage of this feature is that it
allows high-side current sensing at voltages much greater than the supply voltage (V
Figure 1. Application schematics
Signal
conditioning
amplifier
6
Vcc
5 V
Out
5
Vout
Vsense
Iload
Rsense
Current
sense
amplifier
TSC102
Vp
8
Av=20 V/V
Vm
1
Gnd
A1 A2 A3
2
3 74
CC
).
AM04508
Ta bl e 1 describes the function of each pin. Their position is shown in the illustration on the
cover page and in Figure 1 above.
A1
Table 1. Pin description
Symbol Type Function
Out Analog output
Gnd Power supply Ground line.
V
CC
V
p
V
m
Power supply Positive power supply line.
Analog input
Analog input
A1 Analog input Connection to current sensing amplifier output.
A2 Analog input Connection to signal conditioning amplifier non-inverting input.
A3 Analog input Connection to signal conditioning amplifier inverting input.
Out voltage is proportional to the magnitude of the sense voltage
.
V
p-Vm
Connection for the external sense resistor. The measured current
enters the shunt on the V
side.
p
Connection for the external sense resistor. The measured current
exits the shunt on the V
side.
m
Doc ID 16754 Rev 2 3/24
Absolute maximum ratings and operating conditions TSC102
2 Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings
Symbol Parameter Value Unit
V
id
V
V
1
T
stg
T
Input pins differential voltage (Vp-Vm)±20V
Current sensing input pin voltages (Vp and Vm)
i
Voltage for pins A1, A2, A3, Out, Vcc
(1)
(1)
-16 to 60 V
-0.3 to 7 V
Storage temperature -55 to 150 °C
Maximum junction temperature 150 °C
j
TSSOP8 thermal resistance junction to ambient 120 °C/W
R
thja
ESD
1. These voltage values are measured with respect to the GND pin.
2. Human body model for Vm and Vp: a 100 pF capacitor is charged to the specified voltage, then discharged
through a 1.5 kΩ resistor between the Vp or Vm pin and Gnd while the other pins are floating.
3. Human body model: a 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩ resistor between two pins of the device. This is done for all couples of connected pin combinations
while the other pins are floating.
4. Machine model: a 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5 Ω). This is done for all couples of
connected pin combinations while the other pins are floating.
5. Charged device model: all pins plus package are charged together to the specified voltage and then
discharged directly to ground.
Table 3. Operating conditions
SO-8 thermal resistance junction to ambient 125 °C/W
HBM: human body model for V
HBM: human body model
MM: machine model
CDM: charged device model
(3)
(4)
(5)
and Vp pins
m
(2)
4kV
2.5 kV
200 V
1.5 kV
Symbol Parameter Value Unit
V
CC
T
oper
V
icm
DC supply voltage from T
Operational temperature range (T
Common mode voltage range (Vm pin voltage) 2.8 to 30 V
4/24 Doc ID 16754 Rev 2
min
to T
max
min
to T
3.5 to 5.5 V
) -40 to 125 °C
max
TSC102 Electrical characteristics
3 Electrical characteristics
Unless otherwise specified, the electrical characteristics given in the following tables have
been measured under the following test conditions.
● T
● No load on Out pin.
● Signal conditioning amplifier used as a buffer (pin A3 connected to pin Out and pin A1
Table 4. Supply
Symbol Parameter Test conditions Min. Typ. Max. Unit
I
I
CC1
Table 5. Current sensing amplifier input stage
Total supply current
CC
Total supply current
=25°C, VCC=5V, V
amb
connected to pin A2).
sense=Vp-Vm
V
= 0 V, pin A1 open, pin
sense
=50mV, Vm=12V.
A2 shorted to Gnd
< T
T
V
min
sense
< T
amb
max
= 50 mV, pin A1
connected to pin A2
< T
T
min
amb
< T
max
240 420 µA
420 700 µA
Symbol Parameter Test conditions Min. Typ. Max. Unit
DC
CMR1
AC CMR1
SVR1
V
dV
os
1. See Chapter 6: Parameter definitions on page 12 for the definition of CMR.
2. See Chapter 6 for the definition of SVR.
3. See Chapter 6 for the definition of V
DC common mode rejection
Variation of V
versus V
a1
referred to input
AC common mode rejection
Variation of Va1 versus V
referred to input (peak-to-peak
voltage variation)
Supply voltage rejection
Variation of V
Input offset voltage
os
versus V
a1
(1)
(3)
icm
icm
CC
(2)
2.8 V < Vm < 30 V
-40° C < T
2.8 V< V
1kHz sine wave
2.8 V < V
10 kHz sine wave
3.5 V< VCC < 5.5 V
-40° C < T
T
amb
-40° C < T
/dT Input offset drift versus T -40° C < T
=0V
V
I
Input leakage current
lk
I
Input bias current
ib
.
os
T
V
T
CC
min
sense
min
< T
< T
=25° C
=0V
amb
< 30 V
m
< 30 V
m
amb
< 150° C
< 125° C
90 100 dB
75 dB
60 dB
85 90 dB
±1.5
< 125° C
amb
< 125° C ±3 ±8 µV/°C
amb
< T
amb
max
< T
amb
max
±2.3
1µA
57 µA
mV
Doc ID 16754 Rev 2 5/24
Electrical characteristics TSC102
Table 6. Current sensing amplifier output stage
Symbol Parameter Test conditions Min. Typ. Max. Unit
Av
V
oh1
V
I
sc1
ΔV
a1
ΔVa1/ΔIa1Output stage load regulation
ΔV
ΔV
ΔV
ΔV
1. See Chapter 6: Parameter definitions on page 12 for the definition of output voltage drift versus temperature.
2. Output voltage accuracy is the difference with the expected theoretical output voltage V
a more detailed definition.
Table 7. Current sensing amplifier frequency response
Gain
(variation of V
A1 node high-level saturation
voltage
V
oh1=Vcc-Va1
A1 node low-level saturation
ol1
voltage
versus V
a1
sense
)
V
= 1 V
sense
=1mA
I
a1
-40° C< T
=-1 V
V
sense
Ia1=1mA
-40° C< T
< 125° C
amb
< 125° C
amb
20 V/V
85 185 mV
75 165 mV
Short-circuit current A1 connected to VCC or Gnd 10 30 mA
/ΔT Output voltage drift versus T
Total output voltage accuracy
a1
Total output voltage accuracy
a1
Total output voltage accuracy
a1
Total output voltage accuracy
a1
(1)
(2)
(2)
(2)
(2)
T
< T
amb
a1
= 50 mV
= 25° C
< T
amb
= 100 mV
= 25° C
< T
amb
= 20 mV
= 25° C
< T
amb
= 10 mV
= 25° C
< T
amb
< T
max
< +5 mA
< T
max
< T
max
< T
max
< T
max
min
-5 mA < I
sink or source current
I
a1
V
sense
T
amb
T
min
V
sense
T
amb
T
min
V
sense
T
amb
T
min
V
sense
T
amb
T
min
a1-th
0.4 ±2 mV/mA
=Av * V
sense
±400 ppm/°C
±2.5
±4
±2.5
±4
±8
±10
±13
±16
. See Chapter 6 for
%
%
%
%
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
ts V
settling to 1% final value
a1
SR Slew rate V
BW 3 dB bandwidth C
Table 8. Current sensing amplifier noise
C
sense
load
sense
load
Symbol Parameter Test conditions Min. Typ. Max. Unit
e
Equivalent input noise voltage f = 1 kHz 50 nV/√ Hz
N
6/24 Doc ID 16754 Rev 2
=10mV to 100mV,
=47pF
7µs
=10mV to 100mV 0.2 0.4 V/µs
= 47 pF 800 kHz
TSC102 Electrical characteristics
Table 9. Signal conditioning amplifier
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
Common mode voltage range T
icm
min
< T
amb
< T
max
0Vcc
Va2=1V
V
ΔV
Input offset voltage
IO
Input offset voltage drift T
IO
Iib Input bias current V
Output high-level saturation
voltage (V
Output low-level saturation voltage
ol2
oh2=VCC-Vout
)
Short-circuit current Out connected to VCC or Gnd 12 30 mA
/ΔI
Output stage load regulation
out
DC common mode rejection
Variation of V
versus V
IO
icm
Supply voltage rejection
Variation of V
versus V
IO
CC
ΔV
CMR2
SVR2
V
out
V
I
oh2
sc2
GBP Gain bandwidth product
PM Phase margin R
T
=25° C
amb
-40° C < T
< T
min
a2=Va3=VCC
amb
< 150° C
amb
< T
max
/2 10 pA
Va2=1V Va3=0V I
-40° C< T
V
=0V Va3=1V
a2
=1mA
I
out
-40° C< T
-10 mA < I
=1V
V
a2
I
sink or source current
out
< T
T
min
amb
amb
out
amb
< 125° C
< 125° C
< +10 mA
< T
max
0V<Va2<3 V
0V<Va2<5 V
3.5 V<VCC<5.5 V
=1V
V
a2
-40° C < T
R
=10kΩ, C
L
< 125° C
amb
load
=100pF,
f=100kHz
=10kΩ, C
L
=10kΩ, C
R
L
= 100 pF 65 deg
load
=100pF
load
=1mA
out
70
60
85 105 dB
±3.5
±4.5
5µV/°C
85 185 mV
75 165 mV
300 µV/mA
95
80
1MHz
Va2= 0.5 V to 4.5 V
SR Slew rate
A3 connected to OUT (follower
configuration)
0.2 0.4 V/µs
Slew rate measured from 10%
to 90% of V
out
step
mV
dB
Doc ID 16754 Rev 2 7/24
Electrical characteristics curves: current sense amplifier TSC102
-20%
-15%
-10%
-5%
0%
5%
10%
15%
20%
0 50 100 150 200
0
100
200
300
400
500
600
700
-250 -150 -50 50 150 250
T=-40°C
4 Electrical characteristics curves: current sense
amplifier
Unless otherwise specified, the test conditions for the following curves are:
● T
● no load on Out pin.
● signal conditioning amplifier used as a buffer (pin A3 connected to pin Out and pin A1
Figure 2. Output voltage vs. Vsense Figure 3. A1 pin voltage accuracy vs. Vsense
6
5
4
3
Vout (V)
2
1
=25°C, VCC=5V, V
amb
connected to pin A2).
sense=Vp-Vm
=50mV, Vm=12V.
typical accuracy
guaranteed
accuracy vs. T
guaranteed
accuracy @25°C
0
-50 50 150 250
Vsense (mV)
Vsense (mV)
Figure 4. Supply current vs. supply voltage Figure 5. Supply current vs. Vsense
500
450
400
350
T=125°C
300
250
200
Icc (µA)
150
100
50
T=-40°C
T=25°C
0
0246
Vcc (V)
Icc (µA)
Vsense (mV)
T=25°C
T=125°C
8/24 Doc ID 16754 Rev 2
Loading...