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)： 21/33頁(yè)
文件大?。?/td> 444K
代理商： IR3082MTR
IR3082
Page 21 of 21
12/17/04
No Load Output Voltage Setting Resistor
R
FB
and Adaptive Voltage Positioning Resistor
R
DRP
A resistor between FB pin and the converter output is used to create output voltage offset V
O_NLOFST,
which is the
difference between V
DAC
voltage and output voltage at no load condition. Adaptive voltage positioning lowers the
converter voltage by Ro times Io, where Ro is the required output impedance of the converter.
R
FB
is not only determined by I
FB
, the current flowing out of the FB pin as shown in Figure 14, but also affected by
the total input offset voltage of current sense amplifiers. R
FB
and R
DRP
are determined by (15) and (16)
respectively.
R
n
V
V
R
R
_
G
R
R
R
IR3086 EXTERNAL COMPONENTS
PWM Ramp Resistor
R
PWMRMP
and Capacitor C
PWMRMP
PWM ramp is generated by connecting the resistor R
PWMRMP
between
a voltage source and PWMRMP pin as well
as the capacitor C
PWMRMP
between PWMRMP and LGND. Choose the desired PWM ramp magnitude V
RAMP
and
the capacitor C
PWMRMP
in the range of 100pF and 470pF, and then calculate the resistor R
PWMRMP
from Equation
(17). To achieve feed-forward voltage mode control, the resistor R
RAMP
should be connected to the input of the
converter.
V
R
Inductor Current Sensing Capacitor
C
CS+
and Resistors
R
CS+
and
R
CS-
The DC resistance of the inductor is utilized to sense the inductor current. Usually the resistor R
CS+
and capacitor
C
CS+
in parallel with the inductor are chosen to match the time constant of the inductor, and therefore the voltage
across the capacitor C
CS+
represents the inductor current. If the two time constants are not the same, the AC
component of the capacitor voltage is different from that of the real inductor current. The time constant mismatch
does not affect the average current sharing among the multiple phases, but affect the current signal ISHARE as well
as the output voltage during the load current transient if adaptive voltage positioning is adopted.
Measure the inductance L and the inductor DC resistance R
L
. Pre-select the capacitor C
CS+
and calculate R
CS+
as
follows.
R
L
R
MAX
L
FB
O
TOFST
CS
NLOFST
I
O
MAX
L
FB
R
_
_
_
=
(15)
O
MIN
CS
MAX
n
L
FB
DRP
R
=
_
_
(
16)
)]
ln(
)
[ln(
PWMRMP
DAC
IN
DAC
IN
PWMRMP
SW
IN
O
PWMRMP
V
V
V
V
V
C
f
V
=
(17)
+
+
=
CS
L
CS
C
(18)
The bias current flowing out of the non-inverting input of the current sense amplifier creates a voltage drop across
R
CS+,
which is equivalent to an input offset voltage of the current sense amplifier. The offset affects the accuracy of
converter current signal ISHARE as well as the accuracy of the converter output voltage if adaptive voltage
positioning is adopted. To reduce the offset voltage, a resistor R
CS-
should be added between the amplifier inverting
input and the converter output
.
The
resistor R
CS-
is determined by the ratio of the bias current from the non-inverting
input and the bias current from the inverting input.
I
R
+
+
=
CS
CSIN
CSIN
CS
R
I
(19)
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