參數(shù)資料
型號(hào)： IR3082M
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)： 22/33頁(yè)
文件大?。?/td> 444K
代理商： IR3082M
IR3082
Page 22 of 22
12/17/04
If R
CS-
is not used, R
CS+
should be chosen so that the offset voltage is small enough. Usually R
CS+
should be less
than 2 k
and therefore a larger C
CS+
value is needed.
Over Temperature Setting Resistors
R
HOTSET1
and
R
HOTSET2
The threshold voltage of VRHOT comparator is proportional to the die temperature T
J
(oC) of phase IC. Determine
the relationship between the die temperature of phase IC and the temperature of the power converter according to
the power loss, PCB layout and airflow etc, and then calculate HOTSET threshold voltage corresponding to the
allowed maximum temperature from Equation (20).
241
.
10
73
.
+
=
J
HOTSET
T
V
3
(20)
There are two ways to set the over temperature threshold, central setting and local setting. In the central setting,
only one resistor divider is used, and the setting voltage is connected to HOTSET pins of all the phase ICs. To
reduce the influence of noise on the accuracy of over temperature setting, a 0.1uF capacitor should be placed next
to HOTSET pin of each phase IC. In the local setting, a resistor divider per phase is needed, and the setting voltage
is connected to HOTSET pin of each phase. The 0.1uF decoupling capacitor is not necessary. Use VBIAS as the
reference voltage. If R
HOTSET1
is pre-selected, R
HOTSET2
can be calculated as follows.
V
R
R
Phase Delay Timing Resistors
R
PHASE1
and
R
PHASE2
The phase delay of the interleaved multiphase converter is programmed by the resistor divider connected at
RMPIN+ or RMPIN- depending on which slope of the oscillator ramp is used for the phase delay programming of
phase IC, as shown in Figure 3.
If the upslope is used, RMPIN+ pin of the phase IC should be connected to RMPOUT pin of the control IC and
RMPIN- pin should be connected to the resistor divider. When RMPOUT voltage is above the trip voltage at
RMPIN- pin, the PWM latch is set. GATEL becomes low, and GATEH becomes high after the non-overlap time.
If down slope is used, RMPIN- pin of the phase IC should be connected to RMPOUT pin of the control IC and
RMPIN+ pin should be connected to the resistor divider. When RMPOUT voltage is below the trip voltage at
RMPIN- pin, the PWM latch is set. GATEL becomes low, and GATEH becomes high after the non-overlap time.
Use VBIAS voltage as the reference for the resistor divider since the oscillator ramp magnitude from control IC
tracks VBIAS voltage. Try to avoid both edges of the oscillator ramp for better noise immunity. Determine the ratio
of the programming resistors, RA
PHASEx
, corresponding to the desired switching frequencies and phase numbers. If
the resistor R
PHASEx1
is pre-selected, the resistor R
PHASEx2
is determined as:
R
RA
R
1
Combined Over Temperature and Phase Delay Setting Resistors
R
PHASE1
,
R
PHASE2
and
R
PHASE3
The over temperature setting resistor divider can be combined with the phase delay resistor divider to save one
resistor per phase.
Calculate the HOTSET threshold voltage V
HOTSET
corresponding to the allowed maximum temperature from
Equation (20). If the over temperature setting voltage is lower than the phase delay setting voltage,
VBIAS*RA
PHASEx
, connect RMPIN+ or RMPIN- pin between R
PHASEx1
and
R
PHASEx2
and
connect HOTSET pin
between
R
PHASEx2
and R
PHASEx3
respectively. Pre-select R
PHASEx1,
then calculate R
PHASEx2
and R
PHASEx3
,
HOTSET
BIAS
HOTSET
HOTSET
V
HOTSET
V
=
1
2
(21)
PHASEx
PHASEx
PHASEx
PHASEx
RA
=
1
2
(22)
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