TPS767D3xx
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SLVS209H – JULY 1999 – REVISED AUGUST 2008
V
IN
IN
OUT
+
EN
GND
ESR
C
OUT
To Load
R
L
Figure 20. Test Circuit for Typical Regions of Stability (Figure
through
(Fixed Output Options)
Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor, any
resistance added externally, and PWB trace resistance to C
OUT
.
TYPICAL REGION OF STABILITY
ESR vs OUTPUT CURRENT
10
TYPICAL REGION OF STABILITY
ESR vs OUTPUT CURRENT
10
Region of Instability
ESR
-
Equivalent Series Resistance
- W
1
V
OUT
= 3.3V
C
OUT
= 4.7
m
F
V
IN
= 4.3V
T
A
= +25
°
C
0.1
ESR
-
Equivalent Series Resistance
- W
Region of Instability
1
V
OUT
= 3.3V
C
OUT
= 4.7
m
F
V
IN
= 4.3V
T
A
= +125
°
C
0.1
Region of Stability
Region of Stability
Region of Instability
0.01
0
200
400
600
800
1000
I
OUT
-
Output Current
-
mA
Region of Instability
0.01
0
200
400
600
800
1000
I
OUT
-
Output Current
-
mA
Figure 21.
TYPICAL REGION OF STABILITY
ESR vs OUTPUT CURRENT
10
10
Figure 22.
TYPICAL REGION OF STABILITY
ESR vs OUTPUT CURRENT
Region of Instability
ESR
-
Equivalent Series Resistance
- W
Region of Instability
1
V
OUT
= 3.3V
C
OUT
= 22
m
F
V
IN
= 4.3V
T
A
= +25
°
C
0.1
ESR
-
Equivalent Series Resistance
- W
1
V
OUT
= 3.3V
C
OUT
= 22
m
F
V
IN
= 4.3V
T
A
= +125
°
C
0.1
Region of Stability
Region of Stability
Region of Instability
0.01
0
200
400
600
800
1000
I
OUT
-
Output Current
-
mA
Region of Instability
0.01
0
200
400
600
800
1000
I
OUT
-
Output Current
-
mA
Figure 23.
Figure 24.
Copyright © 1999–2008, Texas Instruments Incorporated
9
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