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參數(shù)資料
| 型號(hào)： | LT3460 |
| 廠(chǎng)商： | Linear Technology Corporation |
| 英文描述： | 1.3MHz Step-Up DC/DC Converter in SC70 and ThinSOT |
| 中文描述： | 1.3MHz升壓直流/直流轉(zhuǎn)換器SC70和采用ThinSOT |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大小： | 211K |
| 代理商： | LT3460 |
LT3460
6
3460f
margin, C
F
should be chosen so that the midpoint fre-
quency between the zero and the pole is at the cross over
frequency.
With C
F
= 20pF, the feedback loop Bode plot is reshaped
as shown in Figure 4. The phase margin is about 60
°
.
OPERATIOU
60
50
40
30
20
10
0
–10
–20
–30
–40
P
90
45
0
–45
–90
–135
–180
–225
–270
–315
–360
FREQUENCY (kHz)
PHASE
GAIN
1
G
10
100
1000
3460 F04
R1
R2
GND
C
F
C2
L1
D1
C1
V
OUT
V
IN
SHUTDOWN
+
+
R1
R2
GND
C
F
C2
L1
D1
C1
V
OUT
V
IN
SHUTDOWN
3460 F05
+
+
(SOT-23 PACKAGE)
(SC70 PACKAGE)
Figure 5. Suggested Layout
The feed-forward capacitor increases the gain at high
frequency. The feedback loop therefore needs to have
enough attenuation at the switching frequency to reject the
switching noise. Additional internal compensation com-
ponents have taken this into consideration.
For most of the applications of LT3460, the output capaci-
tor ESR zero is at very high frequency and can be ignored.
If a low frequency ESR zero exists, for example, when a
high-ESR Tantalum capacitor is used at the output, the
phase margin may be enough even without a feed-forward
capacitor. In these cases, the feed-forward capacitor should
not be added because it may cause the feedback loop to
not have enough attenuation at the switching frequency.
Layout Hints
The high speed operation of the LT3460 demands careful
attention to board layout. You will not get advertised
performance with careless layout. Figure 5 shows the
recommended component placement.
Figure 4.
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