Datasheet

Frequency (Log Scale)
0 dB
f
P1
f
Z1
f
P2
f
Z2
A
MID(band)
C1 +
1
2p R6 f
P1
C3 +
1
2p R6 f
Z1
R6 +
A
MID(band)
(
R10 R8
)
R10 ) R8
R10 +
1
2p C2 f
P1
C2 +
1
2p R8 f
Z2
TPS40192, TPS40193
SLUS719E –MARCH 2007–REVISED MAY 2013 www.ti.com
Table 6. Error Amplifier Design Parameters
PARAMETER SYMBOL VALUE UNITS
First zero frequency F
Z1
5.8
Second zero frequency F
Z2
11.0
kHz
First pole frequency F
P1
60
Second pole frequency F
P2
500
Midband gain A
MID(band)
1.86 V/V
Approximate C2 with the formula described in Equation 32.
(32)
C2 = 1000 pf (A standard capacitor value to calculated 723 pF) and approximate R6 with the formula described
in Equation 33.
(33)
R10 = 2.61 kΩ (Closest standard resistor value to calculated 2.65 kΩ ) Calculate R3 with Equation 34.
(34)
With A
MID(band)
= 1.86, R10 = 2.61 kΩ and R8 = 20 kΩ , R6 = 4.22 kΩ (Closest standard resistor value to
calculated 4.29 kΩ ).
Calculate C1 and C3 using Equation 35 and Equation 36.
(35)
(36)
For R6 = 4.22kΩ , C1 = 100 pF (a standard value close to 75 pF) C3 = 1000 pF (the closest standard value to
7.5 nF) error amplifier straight line approximation transfer function is described in Figure 20.
Figure 20. Error Amplifier Transfer Function Approximation
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