參數(shù)資料
型號(hào)： IR3082MTR
廠商： International Rectifier
英文描述： XPHASE AMD OPTERON/ATHLON 64 CONTROL IC
中文描述： XPHASE AMD皓龍/速龍64控制IC
文件頁(yè)數(shù)： 23/33頁(yè)
文件大?。?/td> 444K
代理商： IR3082MTR
IR3082
Page 23 of 23
12/17/04
)
1
)
(
1
2
PHASEx
BIAS
PHASEx
HOTSET
RA
BIAS
PHASEx
PHASEx
V
R
V
V
RA
R
=
(23)
)
1
1
3
PHASEx
BIAS
PHASEx
RA
HOTSET
PHASEx
V
R
V
R
=
(24)
If the over temperature setting voltage is higher than the phase delay setting voltage, VBIAS times RA
PHASEx
,
connect HOTSET pin between R
PHASEx1
and
R
PHASEx2
and
connect RMPIN+ or RMPIN- between
R
PHASEx2
and
R
PHASEx3
respectively. Pre-select R
PHASEx1
,
R
V
RA
V
R
HOTSET
BIAS
PHASEx
BIAS
PHASEx
HOTSET
PHASEx
V
V
=
1
2
)
(
(25)
HOTSET
BIAS
PHASEx
BIAS
V
PHASEx
V
PHASEx
R
V
RA
R
=
1
3
(26)
Bootstrap Capacitor
C
BST
Depending on the duty cycle and gate drive current of the phase IC, a 0.1uF to 1uF capacitor is needed for the
bootstrap circuit.
Decoupling Capacitors for Phase IC
0.1uF-1uF decoupling capacitors are required at VCC and VCCL pins of phase ICs.
VOLTAGE LOOP COMPENSATION
The adaptive voltage positioning (AVP is usually used in the computer applications to improve the transient
response and reduce the power loss at heavy load. Like current mode control, the adaptive voltage positioning loop
introduces extra zero to the voltage loop and splits the double poles of the power stage, which make the voltage
loop compensation much easier.
Resistors R
FB
and R
DRP
are chosen according to Equations (15) and (16), and the selection of compensation types
depends on the capacitors used. For the applications using Electrolytic, Polymer or AL-Polymer capacitors, type II
compensation shown in Figure 18 (a) is usually enough. While for the applications with only ceramic capacitors,
type III compensation shown in Figure 18 (b) is preferred.
RFB
RDRP
RCP
CCP
CCP1
RFB1
CFB
RFB
RDRP
RCP
CCP
CCP1
(a) Type II compensation
(b) Type III compensation
Figure 18. Voltage loop compensation network
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