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TSC2011H データシート(PDF) 34 Page - STMicroelectronics

部品番号 TSC2011H
部品情報  High temperature, high voltage, precision, bidirectional current sense amplifiers
PDF  49 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TSC2011H データシート(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
TSC2011H 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)
TSC2010H, TSC2011H, TSC2012H
Application information
DS13791 - Rev 2
page 34/49



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