THS4271_16 Datasheet, PDF (19/50 Pages) Texas Instruments – LOW NOISE, HIGH SLEW RATE, UNITY GAIN STABLE VOLTAGE FEEDBACK AMPLIFIER

THS4271
THS4275
www.ti.com
SLOS397F – JULY 2002 – REVISED OCTOBER 2009
APPLICATION INFORMATION
MAXIMUM DIE TEMPERATURE TO PREVENT
OSCILLATION
The THS4271 and THS4275 may have low-level
oscillation when the die temperature (also called
junction temperature) exceeds +60°C.
The oscillation is a result of the internal design of the
bias circuit, and external configuration is not expected
to mitigate or reduce the problem. This problem
occurs randomly because of normal process
variations and normal testing cannot identify problem
units.
The THS4211 and THS4215 are recommended
replacement devices.
The die temperature depends on the power
dissipation and the thermal resistance of the device.
space
The die temperature can be approximated with the
following formula:
Die Temperature = P_DISS × θ_JA + T_A
Where:
P_DISS = (V_S+– V_S–) × (I_Q + I_LOAD) – (V_OUT × I_LOAD)
Table 1 shows the estimated the maximum ambient
temperature (T_A max) in degrees Celsius for each
package option of the THS4271 and THS4275 using
the thermal dissipation rating given in the Dissipation
Ratings table for a JEDEC standard High-K test PCB.
For each case shown, R_L = 499 Ω to ground and the
quiescent current = 27 mA (the maximum over the
0°C to +70°C temperature range). The last entry for
each package option (shaded cells) lists the
worst-case scenario where the power supply is
single-supply 10 V and ground and the output voltage
is 5 V DC.
Table 1. Estimated Maximum Ambient Temperature Per Package Option
PACKAGE
DEVICE
SOIC
THS4271D
THS4271DR
THS4275D
THS4275DR
Worst Case
VSON
THS4271DRBT
THS4271DRBR
THS4275DRBT
THS4275DRBR
Worst Case
PowerPad™ MSOP
THS4271DGN
THS4271DGNR
THS4275DGN
THS4275DGNR
Worst Case
MSOP
THS4271DGK
THS4271DGKR
THS4275DGK
THS4275DGKR
Worst Case
V_S+
5V
10 V
5V
10 V
5V
10 V
5V
10 V
V_S–
–5 V
0V
–5 V
0V
–5 V
0V
–5 V
0V
V_OUT
0V
2 V_PP
4 V_PP
6 V_PP
8 V_PP
5 DC
0V
2 V_PP
4 V_PP
6 V_PP
8 V_PP
5 DC
0V
2 V_PP
4 V_PP
6 V_PP
8 V_PP
5 DC
0V
2 V_PP
4 V_PP
6 V_PP
8 V_PP
5 DC
θ_JA
97.5°C/W
45.8°C/W
58.4°C/W
260°C/W
T_A max
33.7°C
32.4°C
31.3°C
30.4°C
29.7°C
28.8°C
47.6°C
47.0°C
46.5°C
46.1°C
45.8°C
45.3°C
44.2°C
43.5°C
42.8°C
42.3°C
41.9°C
41.3°C
–10.2°C
–13.6°C
–16.5°C
–18.9°C
–20.8°C
–23.2°C
Copyright © 2002–2009, Texas Instruments Incorporated
Product Folder Link(s): THS4271 THS4275
Submit Documentation Feedback
19