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參數(shù)資料
| 型號： | LTC3112EDHD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 12 A SWITCHING REGULATOR, 825 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 5 X 4 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WJGD-2, DFN-16 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大?。?/td> | 651K |
| 代理商： | LTC3112EDHD#TRPBF |
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LTC3112
20
3112f
For charging, LED lighting, or other applications that
do not require an optimized output voltage transient re-
sponse, a simple Type I compensation network as shown
in Figure 5 can be used to stabilize the voltage loop. To
ensure sufcient phase margin, the gain of the error am-
plier must be low enough that the resultant crossover
frequency of the control loop is well below the resonant
frequency.
+
–
C1
GND
LTC3112
VCOMP
3112 F05
FB
VOUT
RBOT
RTOP
0.8V
In most applications, the low bandwidth of the Type I
compensated loop will not provide sufcient transient
response performance. To obtain a wider bandwidth
feedback loop, optimize the transient response, and
minimize the size of the output capacitor, a Type III com-
pensation network as shown in Figure 6 is required.
Figure 5. Error Amplier with Type I Compensation
CFB
RFB
GND
LTC3112
VCOMP
3112 F06
FB
VOUT
RBOT
RTOP
RFF
CFF
0.8V
CPOLE
+
–
Figure 6. Error Amplier with Type III Compensation
A Bode plot of the typical Type III compensation network
is shown in Figure 7. The Type III compensation network
provides a pole near the origin which produces a very high
loop gain at DC to minimize any steady state error in the
regulation voltage. Two zeros located at fZERO1 and fZERO2
provide sufcient phase boost to allow the loop crossover
frequency to be set above the resonant frequency, fO, of
the power stage. The Type III compensation network also
introduces a second and third pole. The second pole, at
frequency fPOLE2, reduces the error amplier gain to a
zero slope to prevent the loop crossover from extending
too high in frequency. The third pole at frequency fPOLE3
provides attenuation of high frequency switching noise.
APPLICATIONS INFORMATION
fZERO1
PHASE
90°
–90°
0°
GAIN
–20dB/DEC
fZERO2
3112 F07
f
fPOLE2 fPOLE3
Figure 7. Type III Compensation Bode Plot.
The transfer function of the compensated Type III error
amplier from the input of the resistor divider to the output
of the error amplier, VCOMP, is:
V
COMP (s)
V
OUT (s)
= G
EA
1
+
s
2
πf
ZERO1
1
+
s
2
πf
ZERO2
s1
+
s
2
πf
POLE1
1
+
s
2
πf
POLE2
The error amplier gain is given by the following equation.
The simpler approximate value is sufciently accurate in
most cases since CFB is typically much larger in value
than CPOLE.
G
EA =
1
R
TOP CFB + CPOLE
()
1
R
TOP CFB
The pole and zero frequencies of the Type III compensation
network can be calculated from the following equations
where all frequencies are in Hz, resistances are in ohms,
and capacitances are in farads.
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