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| 型号： | TPS61093DSK |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 2.50 X 2.50 MM, 0.80 MM HEIGHT, PLASTIC, SON-10 |
| 文件页数： | 5/23页 |
| 文件大小： | 760K |
| 代理商： | TPS61093DSK |
80
60
40
20
0
-20
-40
180
135
90
45
0
-45
-90
-135
-180
10
100
1k
10k
100k
1M
f-Frequency-Hz
Gain-dB
Phase-deg
Gain
Phase
V
FB
EA
fzea
fp-ea
P
o
O
1
=
(a)
× R
× C
p
p-f
ff
1
=
(b)
2
R2
C
p
z-f
ff
1
=
(c)
2
R1
C
p
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SLVS992A – SEPTEMBER 2009 – REVISED NOVEMBER 2009
SMALL SIGNAL STABILITY
The TPS61093 integrates slope compensation and the RC compensation network for the internal error amplifier.
Most applications will be control loop stable if the recommended inductor and input/output capacitors are used.
For those few applications that require components outside the recommended values, the internal error
amplifier’s gain and phase are presented in Figure 14.
Figure 14. Bode Plot of Error Amplifier Gain and Phase
The RC compensation network generates a pole fp-ea of 57-kHz and a zero fz-ea of 1.9-kHz, shown in Figure 14.
Use Equation 7 to calculate the output pole, fP, of the boost converter. If fP << fz-ea. due to a large capacitor
beyond 10
μF, for example, a feed forward capacitor on the resistor divider, as shown in Figure 14, is necessary
to generate an additional zero fz-f. to improve the loop phase margin and improve the load transient response.
The low frequency pole fp-f and zero fz-f generated by the feed forward capacitor are given by Equation 8 and
(7)
(8)
(9)
Where Cff = the feed-forward capacitor.
For example, in the typical application circuitry (see Figure 1), the output pole fP is approximately 1-kHz. When
the output capacitor is increased to 100-
μF, then the fP is reduced to 10-Hz. Therefore, a feed-forward capacitor
of 10-nF compensates for the low frequency pole.
A feed forward capacitor that sets fz-f near 10-kHz improves the load transient response in most applications, as
shown in Figure 8.
Copyright 2009, Texas Instruments Incorporated
13
Product Folder Link(s): TPS61093
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