参数资料
型号: LTC3536IMSE#TRPBF
厂商: Linear Technology
文件页数: 22/28页
文件大小: 0K
描述: IC REG BUCK BST SYNC ADJ 12MSOP
标准包装: 2,500
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: 带卷 (TR)
供应商设备封装: 12-MSOP,裸露焊盘
LTC3536
APPLICATIONS INFORMATION
f ZERO2 =
= 5.4kHz
Inordertoimprovethestabilityalsoinbuck-boostmode
of operation, the two compensation zeros could be move
to different frequency:
1
2 π R TOP C FF
140
120
100
80
60
V O /V C
–20
–40
–60
–80
–100
f ZERO1 =
1
2 π R FB C FB
= 2 ? f ZERO2 = 10.8kHz
40
20
0
GAIN
PHASE
–120
–140
–160
The new R FB value is:
–20
–180
R FB =
1
2 π ? ( 180pF ) ? 10.8kHz
= 81.9k ? ≈ 80.6k ?
–40
–60
–80
–200
–220
–240
As consequence the f POLE2 will move to higher frequency:
–100
–260
f POLE2 =
1
2 π C POLE R FB
= 532kHz
–120
1
10
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
–280
100M
3536 F15
V OUT = 0.6 ? 1 + TOP ? V
As shown from Figures 14 and 15, the stability is now
improved for the buck-boost region (V IN = 3V) and remains
good for the boost region (V IN = 1.8V).
In buck mode there is no right-half plane zero and the
stability is normally achieved.
V O /V C
120 –60
100 –80
80 –100
Figure 15. Complete Loop Bode Plot for
Buck-Boost Operation Mode
Output Voltage Programming
The output voltage is set via the external resistor divider
comprised of resistors R TOP and R BOT . The resistor divider
values determine the output regulation voltage according to:
? R ?
? R BOT ?
60
40
20
0
–20
–40
GAIN
PHASE
–120
–140
–160
–180
–200
–220
In addition to setting the output voltage, the value of R TOP
is instrumental in controlling the dynamics of the compen-
sation network. When changing the value of this resistor,
care must be taken to understand the impact this will have
on the compensation network. As noted in the Input and
Peak Current Limit section, “for current limit feature to
be most effected, the Thevenin resistnace (R TOP //R BOT )
from FB to ground should exceed 100k.”
–60
–240
–80
–260
V OUT
LTC3536
R TOP
–100
1
10
100
1k
10k 100k
FREQUENCY (Hz)
1M
10M
–280
100M
3536 F14
FB
R BOT
3536 F16
Figure 14. Complete Loop Bode Plot for Boost Operation Mode
Figure 16. FB Resistor Network
3536fa
22
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