参数资料
型号: LTC3813EG#PBF
厂商: Linear Technology
文件页数: 23/32页
文件大小: 0K
描述: IC REG CTRLR BST PWM CM 28-SSOP
标准包装: 47
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1MHz
电源电压: 7 V ~ 75 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 28-SSOP(0.209",5.30mm 宽)
包装: 管件
产品目录页面: 1336 (CN2011-ZH PDF)
LTC3813
APPLICATIONS INFORMATION
C2
IN
R2
C1
–6dB/OCT
R1
FB
R B
V REF
+
OUT
0
GAIN
PHASE
–6dB/OCT
FREQ
–90
–180
–270
IN
3813 F11
Figure 11. Type 2 Schematic and Transfer Function
C2
–360
C3
R2
C1
R1
R3
–6dB/OCT
R B
FB
V REF
+
OUT
0
GAIN
+6dB/OCT
–6dB/OCT
FREQ
–90
3813 F12
PHASE
Figure 12. Type 3 Schematic and Transfer Function
–180
–270
–360
The two types of compensation networks, Type 2 and Type
3 are shown in Figures 11 and 12. When component values
are chosen properly, these networks provide a “phase
bump” at the crossover frequency. Type 2 uses a single
pole-zero pair to provide up to about 60° of phase boost
while Type 3 uses two poles and two zeros to provide up
to 150° of phase boost.
The compensation of boost converters are complicated
by two factors: the RHP zero and the dependence of the
loop gain on the duty cycle. The RHP zero adds additional
phase lag and gain. The phase lag degrades phase margin
and the added gain keeps the gain high typically in the
frequency region where the user is trying the roll off the
gain below 0dB. This often forces the user to choose a
crossover frequency at a lower frequency than originally
desired. The duty cycle effect of gain (see above transfer
function) causes the phase margin and crossover frequency
to be dependent on the input supply voltage which may
cause problems if the input voltage varies over a wide range
since the compensation network can only be optimized
for a speci?c crossover frequency. These two factors
usually can be overcome if the crossover frequency is
chosen low enough.
Feedback Component Selection
Selecting the R and C values for a typical Type 2 or
Type 3 loop is a nontrivial task. The applications shown
in this data sheet show typical values, optimized for the
power components shown. They should give acceptable
performance with similar power components, but can be
way off if even one major power component is changed
signi?cantly. Applications that require optimized transient
response will require recalculation of the compensation
values speci?cally for the circuit in question. The underly-
ing mathematics are complex, but the component values
can be calculated in a straightforward manner if we know
the gain and phase of the modulator at the crossover
frequency.
Modulator gain and phase can be obtained in one of
three ways: measured directly from a breadboard, or if
3813fb
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