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IN
EN
OUT
+
GND
C
o
ESR
R
L
V
I
To Load
0.01
0 3
10
I
O
− Output Current − A
ESR − Equivalent Series Resistance − Ω
1
0.1
0.015
C
o
= 680 µF
T
J
= 25°C
1 2
Region of Stability
Region of Instability
0.01
0 3
10
I
O
− Output Current − A
1
0.2
ESR − Equivalent Series Resistance − Ω
C
o
= 47 µF
T
J
= 25°C
1 2
Region of Stability
Region of Instability
TPS75801 , , TPS758A01
TPS75815 , TPS75818
TPS75825 , TPS75833
SLVS330F – JUNE 2001 – REVISED APRIL 2007
Figure 17. Test Circuit for Typical Regions of Stability (Figure 18 and Figure 19 ) (Fixed Output Options)
TYPICAL REGION OF STABILITY TYPICAL REGION OF STABILITY
EQUIVALENT SERIES RESISTANCE
(A)
EQUIVALENT SERIES RESISTANCE
(A)
vs vs
OUTPUT CURRENT OUTPUT CURRENT
Figure 18. Figure 19.
A. Equivalent series resistance (ESR) refers to the total series resistance, including the ESR of the capacitor,
any series resistance added externally, and printed wiring board (PWB) trace resistance to C
OUT.
9
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