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TSC2012 Arkusz danych(PDF) 34 Page - STMicroelectronics

Numer części TSC2012
Szczegółowy opis  High voltage, precision, bidirectional current sense amplifiers
PDF  50 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSC2012 Arkusz danych(HTML) 34 Page - STMicroelectronics

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Figure 68. Capacitive load response at Vcc = 3.3 V with
720 kHz RC filter
-4µ
0
4µ
8µ
12µ
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
100
200
300
400
500
600
700
800
900
1000
Time (s)
Sample and hold
Vout
Vcc=3.3V, Vicm=1.65V, Vsense=0Vpp
T=25°C,
Rs=470Ω,Ct=470pF
50kHz square signal of 3.3V amplitude
injected in the output through 40pF
Figure 69. Capacitive load response at Vcc = 3.3 V with
194 kHz RC filter
-4µ
0
4µ
8µ
12µ
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
-1000
-900
-800
-700
-600
-500
-400
-300
-200
-100
0
100
200
300
400
500
600
700
800
900
1000
Time (s)
Sample and hold
Vout
Vcc=3.3V, Vicm=1.65V, Vsense=0Vpp
T=25°C,
Rs=820Ω,Ct=1nF
50kHz square signal of 3.3V amplitude
injected in the output through 40pF
The value of the added external capacitor must be taken into account. Indeed, if this one is chosen with an
excessive value and the serial resistance with a too small value, the risk of instability on the output of the
TSC2011 is high.
•
Driving large capacitive Cload
Increasing the load capacitance produces gain peaking in the frequency response, with an overshoot and ringing
in the step response.
The figure below, shows the serial resistors that must be added to the output, to make a system stable. The
chosen criteria ensures the stability of the system and it is an overshoot lower than 24%.
Figure 70. Stability criteria with a serial resistor at VCC = 5 V
0.1
1
10
100
0
100
200
300
400
500
Stable
Vcc=5V, Vicm=0V,
Vref=Vcc/2,
T=25°C,
Unstable
Capacitive Load (nF)
TSC2010, TSC2011, TSC2012
Application information
DS13057 - Rev 7
page 34/50



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