Datasheet
Table Of Contents
- 1 Absolute maximum ratings and operating conditions
- 2 Electrical characteristics
- Table 3. Electrical characteristics at VCC = +5 V, VDD = 0 V, Vicm = VCC/2, Tamb = 25 °C, RL connected to VCC/2 (unless otherwise specified)
- Table 4. Electrical characteristics at VCC = +3.3 V, VDD = 0 V, Vicm = VCC/2, Tamb = 25 °C, RL connected to VCC/2 (unless otherwise specified)
- Table 5. Electrical characteristics at VCC = +2.7 V VDD = 0 V, Vicm = VCC/2, Tamb = 25 °C, RL connected to VCC/2 (unless otherwise specified)
- Figure 1. Input offset voltage distribution for Vicm£ VCC-1.2 V at T=25 °C
- Figure 2. Input offset voltage distribution vs. temperature for Vicm£ VCC-1.2 V
- Figure 3. Input offset voltage distribution vs. temperature for Vicm ³ VCC-0.8 V
- Figure 4. Input offset voltage distribution for Vicm £ VCC-1.2 V at T=25 °C after HTB
- Figure 5. Input offset voltage distribution for Vicm £ VCC-1.2 V at T=25 °C after THB
- Figure 6. Input offset voltage vs. input common mode voltage at T=25 °C
- Figure 7. Supply current vs. input common mode voltage in closed loop configuration at VCC=5 V
- Figure 8. Supply current vs. supply voltage at Vicm=VCC/2
- Figure 9. Supply current vs. input common mode voltage in follower configuration at VCC=2.7 V
- Figure 10. Supply current vs. input common mode voltage in follower configuration at VCC=5 V
- Figure 11. Output current vs. supply voltage at Vicm=VCC/2
- Figure 12. Output current vs. output voltage at VCC=2.7 V
- Figure 13. Output current vs. output voltage at VCC=5 V
- Figure 14. Positive and negative slew rate vs. supply voltage
- Figure 15. Voltage gain and phase vs. frequency at VCC=5 V and Vicm=2.5 V at T=25 °C
- Figure 16. Voltage gain and phase vs. frequency at VCC=5 V and Vicm=2.5 V at T=-40 °C
- Figure 17. Voltage gain and phase vs. frequency at VCC=5 V and Vicm=2.5 V at T=125 °C
- Figure 18. Closed loop gain in voltage follower configuration for different capacitive load at T=25 °C
- Figure 19. Gain margin according to the output load, at VCC=5 V and T=25 °C
- Figure 20. Phase margin according to the output load, at VCC=5 V and T=25 °C
- Figure 21. Gain margin vs. output current, at VCC=5 V and T=25 °C
- Figure 22. Phase margin vs. output current, at VCC=5 V and T=25 °C
- Figure 23. Phase and gain margins vs capacitive load at = 25 °C
- Figure 24. Distortion + noise vs. output voltage
- Figure 25. Distortion + noise vs. frequency
- Figure 26. Noise vs. frequency
- 3 Application note
- 4 Package information
- 5 Ordering information
- 6 Revision history
DocID10958 Rev 6 15/20
TS507 Application note
3 Application note
The application note AN2653, based on the TS507, describes three compensation
techniques for solving stability issues when driving large capacitive loads. Two of these
techniques are briefly explained below. For more details, refer to the AN2653 on:
www.st.com.
3.1 Out-of-the-loop compensation technique
The first technique, named out-of-the-loop compensation, uses an isolation resistor, R
OL
,
added
in series between the output of the amplifier and its load (see Figure 27). The resistor
isolates the op-amp feedback network from the capacitive load. This compensation method
is effective, but the drawback is a limitation on the accuracy of V
out
depending on the
resistive load value.
Figure 27. Out-of-the-loop compensation schematics
To help implement the compensation, the abacus given in Figure 28 and Figure 29 provides
the R
OL
value to be chosen for a given C
L
and phase/gain margins. These abacus are
plotted for voltage follower configuration with a load resistor of 10 k
Ω at 25 °C.
Figure 28. Gain margin abacus: serial resistor
to be added in a voltage follower
configuration at 25 °C
Figure 29. Phase margin abacus: serial resistor
to be added in a voltage follower
configuration at 25 °C
10p 100p 1n 10n 100n 1µ 10µ
0.01
0.1
1
10
100
V
cc
= 5 V
V
icm
= 2,5 V
T = 25 °C
R
L
= 10 kΩ
16 dB
12 dB
8 dB
4 dB
0 dB
UNSTABLE
STABLE
Compensation Resistor R
OL
Load Capacitor (F)
10p 100p 1n 10n 100n 1µ 10µ
0.01
0.1
1
10
100
30 °
20 °
10 °
V
cc
= 5 V
V
icm
= 2,5 V
T = 25 °C
R
L
= 10 kΩ
0 °
UNSTABLE
STABLE
Compensation Resistor R
OL
Load Capacitor (F)