參數(shù)資料
型號(hào)： IR3080
廠商： International Rectifier
英文描述： XPHASE VRD10 CONTROL IC WITH VCCVID & OVERTEMP DETECT
中文描述： XPHASE VRD10控制集成電路VCCVID
文件頁(yè)數(shù)： 23/41頁(yè)
文件大?。?/td> 2267K
代理商： IR3080
IR3080
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
+
+
=
CS
L
CS
C
(21)
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
(22)
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 (23).
241
.
*
10
*
73
.
+
=
J
HOTSET
T
V
3
(23)
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.
HOTSET
V
BIAS
V
HOTSET
V
HOTSET
R
HOTSET
R
=
1
2
(24)
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 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
PHASEx
RA
PHASEx
PHASEx
PHASEx
=
1
2
(25)
Page 23 of 41
9
/30/04
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