参数资料
型号: LTC3536IMSE#PBF
厂商: Linear Technology
文件页数: 16/28页
文件大小: 0K
描述: IC REG BUCK BST SYNC ADJ 12MSOP
标准包装: 37
类型: 降压(降压),升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 1.8 V ~ 5.5 V
输入电压: 1.8 V ~ 5.5 V
PWM 型: 电压模式,混合
频率 - 开关: 300kHz ~ 2MHz
电流 - 输出: 1A
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: 12-TSSOP (0.118",3.00mm 宽)裸露焊盘
包装: 管件
供应商设备封装: 12-MSOP,裸露焊盘
LTC3536
APPLICATIONS INFORMATION
? V
?
R S
? ? OUT ?
R LOAD
? V
G = V IN ? LOAD ?
R S
? V IN ?
R
? ?
? V OUT ? ?
? V IN ?
? V OUT ? ?
LC OUT ( R LOAD + R C )
? V IN ?
? V IN ?
? ? V
? ? V
? R LOAD – R S ? R LOAD – R S
ω Z =
, f Z =
? V IN ?
LC OUT ( R LOAD + R C ) R S + R LOAD ?
? V OUT ? ?
Q =
? V IN ?
L + C OUT R LOAD R C ? + R S C OUT ( R LOAD + R C )
( s )
V OUT
V C
( 1 + sR C C OUT ) ? ? 1– ω s
Z ?
17.62 ? G
? s ?
s
+ ?
ω O Q ? ω O ? ?
V IN ? 1.85
V OUT + V IN
R S + R LOAD ? ε 2
LC OUT ( R LOAD + R C )
1.85 ? ε 2 R LOAD – R S ? ( 1.85 – ε )
L ? ( 1.85 – ε )
increasinggainanddecreasingphaseathigherfrequen-
cies. As a result, the crossover frequency in boost mode
operation generally must be set lower than in buck mode
in order to maintain sufficient phase margin.
2
1–
R IN ?
2
1 + LOAD
R S
2
R S + R LOAD ?
ω O =
In boost mode operation, the frequency of the right-half
plane zero, f Z , is given by the following expression. The
frequency of the right half plane zero decreases at higher
loads and with larger inductors.
2 2
OUT ? OUT ?
L 2 π L
Finally, the magnitude of the quality factor of the power
stage in boost mode operation is given by the following
expression:
2
2
? V OUT ? ?
Buck-Boost Mode
When the converter operates in buck-boost mode and the
small-signal transfer function from control voltage, V C , to
the output voltage is given by the following expression:
=
Buck-Boost Mode
? ?
2
1 +
Also in buck-boost mode operation, the transfer function
is characterized by a pair of resonant poles and a zero
generated by the ESR of the output capacitor as in buck
mode and a right half plane zero.
G = 0.15 ? V OUT ( R LOAD ? ε 2 ? 1.85 – R S ? ( 1.85 – ε ) )
ε ? ( 1.85 – ε ) ? ( R S + R LOAD ? ε 2 )
where the variable ε is defined:
ε=
ω O =
In buck-boost mode operation, the frequency of the right-
half plane zero, f Z , is given by the following expression.
The frequency of the right-half plane zero decreases at
higher loads and with larger inductors.
ω Z =
3536fa
16
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