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LM2735XMF/NOPB データシート(PDF) 12 Page - Texas Instruments

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部品番号 LM2735XMF/NOPB
部品情報  LM2735-xx 520-kHz and 1.6-MHz Space-Efficient Boost and SEPIC DC-DC Regulator
PDF  59 Pages
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM2735XMF/NOPB データシート(HTML) 12 Page - Texas Instruments

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background image
10 kHz
5 kHz o
=
=
1
(
)
R2 xCf
2 S
F
CF
ZERO -
REF
V
¨
¨
©
§
OUT
V
=
2
R
1¸¸
¹
·
-
x
1
R
10
100
1k
10k
100k
1M
FREQUENCY
-80
-60
-40
-20
0
20
40
60
80
-180
-90
0
90
180
RHP-Zero
Ext (Cf)
gm-Pole
RC-Pole
Vi = 5V
Vo = 12V
Io = 500 mA
Co = 10 mF
Lo = 5 mH
Ext (Cf)-Pole
gm-zero
-Zero
D = 0.625
Cf = 220 pF
Fz-cf = 8 kHz
RHP-Zero = 107 kHz
Fp-rc = 660 Hz
Fp-cf = 77 kHz
10
100
1k
10k
100k
1M
FREQUENCY
-80
-60
-40
-20
0
20
40
60
80
-180
-90
0
90
180
RHP-Zero
gm-Zero
gm-Pole
RC-Pole
Vi = 5V
Vo = 12V
Io = 500 mA
Co = 10 2F
Lo = 5 2H
LM2735, LM2735-Q1
SNVS485G – JUNE 2007 – REVISED AUGUST 2015
www.ti.com
Feature Description (continued)
Figure 15. LM2735 Without External Compensation
One can see that the crossover frequency is fine, but the phase margin at 0 dB is very low (22°). A zero can be
placed just above the crossover frequency so that the phase margin will be bumped up to a minimum of 45°.
Below is the same application with a zero added at 8 kHz.
Figure 16. LM2735 With External Compensation
The simplest method to determine the compensation component value is as follows.
Set the output voltage with the following equation.
where
•
R1 is the bottom resistor and R2 is the resistor tied to the output voltage.
(1)
The next step is to calculate the value of C3. The internal compensation has been designed so that when a zero
is added from 5 kHz to 10 kHz, the converter will have good transient response with plenty of phase margin for
all input and output voltage combinations.
(2)
12
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Copyright © 2007–2015, Texas Instruments Incorporated
Product Folder Links: LM2735 LM2735-Q1



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