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參數(shù)資料
| 型號： | IR3088M |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT |
| 中文描述： | XPHASE相集成電路及超溫故障檢測 |
| 文件頁數(shù)： | 18/34頁 |
| 文件大?。?/td> | 688K |
| 代理商： | IR3088M |
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IR3088
If the over temperature setting voltage is higher than the phase delay setting voltage, VBIAS*RA
PHASEx
, connect
HOTSET pin between R
PHASEx1
and
R
PHASEx2,
and
connect RMPIN+ or RMPIN- between
R
PHASEx2
and R
PHASEx3
.
Pre-select R
PHASEx1
,
V
RA
V
R
HOTSET
BIAS
PHASEx
BIAS
PHASEx
HOTSET
PHASEx
V
V
R
=
1
2
)
(
(25)
HOTSET
V
BIAS
V
PHASEx
R
BIAS
V
PHASEx
RA
PHASEx
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 adopted 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 output capacitors used in the converter. For the applications using Electrolytic, Polymer or AL-
Polymer capacitors and running at lower frequency, type II compensation shown in Figure 9(a) is usually enough.
While for the applications using only ceramic capacitors and running at higher frequency, type III compensation
shown in Figure 9(b) is preferred.
For applications where AVP is not required, the compensation is the same as for the regular voltage mode control.
For converter using Polymer, AL-Polymer, and ceramic capacitors, which have much higher ESR zero frequency,
type III compensation is required as shown in Figure 9(b) with R
DRP
and C
DRP
removed.
RCP
CCP1
EAOUT
CCP
RFB
RDRP
VO+
VDRP
VDAC
+
-
EAOUT
FB
CFB
CDRP
RCP
EAOUT
CCP1
CCP
RFB
RDRP
VO+
VDRP
VDAC
FB
+
-
EAOUT
RFB1
(a) Type II compensation
(b) Type III compensation
Figure 9. Voltage loop compensation network
Type II Compensation for AVP Applications
Determine the compensation at no load, the worst case condition. Choose the crossover frequency fc between 1/10
and 1/5 of the switching frequency per phase. Assume the time constant of the resistor and capacitor across the
output inductors matches that of the inductor, and determine R
CP
and C
CP
from Equations (27) and (28), where L
E
and C
E
are the equivalent inductance of output inductors and the equivalent capacitance of output capacitors
respectively.
Page 18 of
34
9/30
/04
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