参数资料
型号: LT8582EDKD#TRPBF
厂商: Linear Technology
文件页数: 29/36页
文件大小: 0K
描述: IC REG MULTI CONFIG ADJ 3A 24DFN
标准包装: 2,500
类型: 升压(升压),反相,回扫,Sepic
输出类型: 可调式
输出数: 2
输出电压: 最高 42V
输入电压: 2.5 V ~ 22 V
PWM 型: 电流模式
频率 - 开关: 200kHz ~ 2.5MHz
电流 - 输出: 3A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 24-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 24-DFN(7x4)
LT8582
APPENDIX
The current mode zero (Z3) is a right half plane zero
140
0
which can be an issue in feedback control design, but is
manageable with proper external component selection.
Using the circuit in Figure 17 as an example, Table 8 shows
the parameters used to generate the bode plot shown in
Figure 16.
Table 8. Bode Plot Parameters
120
100
80
60
40
20
GAIN
PHASE
50° AT
5kHz
–45
–90
–135
–180
–225
–270
PARAMETER
VALUE
UNITS
COMMENT
0
–315
R L
C OUT
20
22
Ω
μF
Application Specific
Application Specific
–20
10
100
1k 10k
FREQUENCY (Hz)
100k
–360
1M
R ESR
R O
C C
C F
1
305
4700
47
pF
pF
Application Specific
Not Adjustable
Adjustable
Optional/Adjustable
8582 F16
Figure 16. Bode Plot for Example Boost Converter
C PL
R C
0
6.49
pF
Optional/Adjustable
Adjustable
V IN
5V
L1
4.7μH
D1
V OUT
12V
R1
R2
130
14.5
Adjustable
Not Adjustable
V IN
SWA
SWB
FBX
130k
V REF
V OUT
V IN
1.204
12
5
V
V
V
Not Adjustable
Application Specific
Application Specific
215k
100k
SHDN
PG
RT
GATE
LT8582
CHx CLKOUT
VC
C OUT
22μF
g ma
g mp
L
270
15.1
4.7
μmho
mho
μH
Not Adjustable
Not Adjustable
Application Specific
C IN
4.7μF
R T
53.6K
SYNC
GND
SS
0.1μF
47pF
6.49k
4.7nF
f OSC
1.5
MHz
Adjustable
8582 F17
From Figure 16, the phase is –130° when the gain reaches
Figure 17. 5V to 12V Boost Converter
0dB, giving a phase margin of 50°. The crossover frequency
is 5kHz, which is many times lower than the frequency of
the RHP zero Z3, thus providing for adequate phase margin.
8582f
29
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