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參數(shù)資料
| 型號(hào)： | LT3581IMSE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO16 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件頁(yè)數(shù)： | 20/36頁(yè) |
| 文件大小： | 498K |
| 代理商： | LT3581IMSE#PBF |
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LT3581
3581f
From Figure 16, the DC gain, poles and zeros can be
calculated as follows:
DC Gain
A
DC
OL
:
( )
(Breaking loop at FB pin)
=
0
=
V
I
V
I
V
g
C
FB
VIN
C
OUT
VIN
FB
OUT
ma R
R
g
V
R
O
mp
IN
OUT
L
(
)
+
η
2
0 5
2
1
2
.
OOutput Pole P
R C
Error Amp Pole P
L
OUT
:
1
2
=
=
π
11
2
1
2
+
=
π
R
C
Error Amp Zero Z
R C
O
C
:
CC
ESR
OUT
IN
ESR Zero Z
R
C
RHP Zero Z
V
:
2
1
2
3
2
=
=
π
RR
V
L
High Frequency Pole P
f
Phase
L
OUT
S
2
3
2
>
π
:
LLead Zero Z
R C
Phase LeadPole P
PL
:
4
1
2
1
4
1
2
=
=
π
+
=
π
R
C
Error Amp Filter Pole
P
PL
1
2
1
2
5
1
:
22
10
+
<
π
R R
R
C
O
C
O
F
C
,
The current mode zero (Z3) is a right half plane zero which
can be an issue in feedback control design, but is manage-
able with proper external component selection.
appenDix
Using the circuit in Figure 18 as an example, Table 8 shows
the parameters used to generate the Bode plot shown in
Figure 17.
Table 8. Bode Plot Parameters
PARAMETER
VALUE
UNITS
COMMENT
RL
14.5
Ω
Application Specific
COUT
9.4
F
Application Specific
RESR
1
mΩ
Application Specific
RO
305
kΩ
Not Adjustable
CC
1000
pF
Adjustable
CF
56
pF
Optional/Adjustable
CPL
0
pF
Optional/Adjustable
RC
10.5
kΩ
Adjustable
R1
130
kΩ
Adjustable
R2
14.6
kΩ
Not Adjustable
VREF
1.215
V
Not Adjustable
VOUT
12
V
Application Specific
VIN
5
V
Application Specific
gma
270
mho
Not Adjustable
gmp
15.1
mho
Not Adjustable
L
1.5
H
Application Specific
fOSC
2
MHz
Adjustable
From Figure 17, the phase is –130° when the gain reaches
0dBgivingaphasemarginof50°.Thecrossoverfrequency
is 17kHz, which is more than three times lower than the
frequency of the RHP zero Z3 to achieve adequate phase
margin.
Figure 17. Bode Plot for Example Boost Converter
FREQUENCY (Hz)
10
50
GAIN
(dB)
PHASE
(DEG)
70
90
110
130
100
1k
10k
100k
1M
3851 F17
30
10
–10
–30
150
170
–120
–80
–40
–240
–280
–160
–180
–360
–320
–200
0
PHASE
GAIN
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| LT3582EUD#PBF | 功能描述:IC REG BOOST INV ADJ DL 16QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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