參數(shù)資料
型號(hào)： IR3092MTR
廠商： International Rectifier
英文描述： 2 PHASE OPTERON, ATHLON, OR VR10.X CONTROL IC
中文描述： 2相皓龍，速龍，或控制IC的VR10.X
文件頁(yè)數(shù)： 24/37頁(yè)
文件大?。?/td> 619K
代理商： IR3092MTR
IR3092
Page 24 of 37
06/25/04
The maximum and minimum duty cycle adjust range of Ramp2 compared to Ramp1 has been limited to 0.5x and 2.0x of
the master’s ramp (see Figure 3.). The crossover frequency of the current share loop can be programmed with a capacitor
at the SCOMP pin so that the share loop does not interact with the output voltage loop. A 22nF capacitor from SCOMP to
LGND is good for most of the applications. If necessary
have a 1k resistor in series with the Csc to make the current loop
a little bit faster.
The SCOMP capacitor is driven by a trans-conductance stage capable of sourcing and sinking 25uA. The duty cycle of
Ramp2 inversely tracks the voltage on the SCOMP pin; if V(SCOMP) increases, Ramp2’s slope will increase and the
effective duty cycle will decrease resulting in a reduction in Phase 2’s output current. Due to the limited 25uA source
current, an SCOMP pre-charge circuit has been included to pre-condition V(SCOMP) so that the duty cycle of Ramp2 is
equal to Ramp1 prior to any GATEHX high pulses. The pre-condition circuit can source 400uA. The Equal Duty Cycle
Comparator (see Block Diagram) activates a pre-charge circuit when SS/DEL is less than 0.7V. The Error Amplifier
becomes active enabling GATEH switching when SS/DEL is above 1.3V.
Compensation of Voltage Loop
The adaptive voltage positioning is used in the computer applications to meet the load line requirements. 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 (9) and (10), 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 11 (a) is usually enough. While for the applications with only low ESR ceramic capacitors,
type III compensation shown in Figure 11 (b) is preferred.
(a) Type II compensation
(b) Type III compensation
Figure11 . Voltage loop compensation network
Type II Compensation
Determine the compensation at no load, the worst case condition. Assume the time constant of the resistor and capacitor
across the output inductors matches that of the inductor, the crossover frequency of the voltage loop can be estimated by
Equations (13), where C
E
and R
CE
are the equivalent capacitance and ESR of output capacitors respectively and R
LE
is
the equivalent resistance of inductor DCR.
R
f
S
)
*
(
*
2
CE
LE
FB
CS
E
DRP
R
C
R
R
G
C
(13)
CFB
CDRP
RCOMP
EAOUT
CCP1
CCOMP
RFB
RDRP
VO+
VDRP
VDAC
FB
+
-
EAOUT
RFB1
RCOMP
CCP1
EAOUT
CCOMP
RFB
RDRP
VO+
VDRP
VDAC
+
-
EAOUT
FB
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