參數(shù)資料
型號(hào): SP6136ER1
英文描述: Evaluation Board Manual
中文描述: 評(píng)估板手冊(cè)
文件頁數(shù): 6/9頁
文件大?。?/td> 428K
代理商: SP6136ER1
Rev 5/01/06 SP6136 Evaluation Manual Copyright 2006 Sipex Corporation
Page 6 of 9
The simple guidelines for positioning the poles and zeros and for calculating the component
values for Type III compensation are as follows:
K
R
1
68
1
=
1
8
2
1
3
=
(sets first zero)
8
×
=
Vout
R
R
(sets output voltage)
LC
R
ZSF
CZ
1
1
×
×
(
.
)
×
(
)
Vin
Vramp
CZ
fc
Cout
L
fc
RZ
×
×
+
×
×
×
=
3
28
.
1
28
2
2
(sets the cross-over frequency, fc)
LC
RZ
ZSF
CZ
1
2
1
2
×
×
=
(sets second zero)
2
28
.
1
1
RZ
fs
CP
×
×
=
(sets first high-frequency pole)
3
28
.
1
3
CZ
fs
RZ
×
×
=
(sets second high-frequency pole)
Where ZSF=(f compensation double zero)/(f circuit double pole)
Here ZSF is set at 0.8.
As a particular example, consider for the following SP6136EB, 7AMAX with a type III Voltage
Loop Compensation component selections:
Vin = 12V
Vout = 3.30V @ 0 to 7A load
Select L = 2.2 uH => 30% current ripple.
Select Cout = 100uF Ceramic capacitor (Resr
5m
)
fs = 600KHz SP6136ER1 internal Oscillator Frequency
Vramp_pp = 1.0V SP6136ER1 internal Ramp Peak to Peak Amplitude
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