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)： 19/33頁(yè)
文件大?。?/td> 444K
代理商： IR3082MTR
IR3082
Page 19 of 19
12/17/04
DESIGN PROCEDURES – IR3082 AND IR3086 CHIPSET
IR3082 EXTERNAL COMPONENTS
Oscillator Resistor
Rosc
The oscillator of IR3082 generates a triangle waveform to synchronize the phase ICs, and the switching frequency
of the each phase converter equals the oscillator frequency, which is set by the external resistor R
OSC
according to
the curve in Figure 13.
Soft Start Capacitor
C
SS/DEL
and Resistor
R
SS/DEL
Because the capacitor C
SS/DEL
programs three different time parameters, i.e. soft start time, over current latch
delay time, and the frequency of hiccup mode, they should be considered together while choosing C
SS/DEL
.
The SS/DEL pin voltage controls the slew rate of the converter output voltage, as shown in Figure 10. After the
ENABLE pin voltage rises above 1.23V, there is a soft-start delay time t
SSDEL
, after which the error amplifier output
is released to allow the soft start. The soft start time t
SS
represents the time during which the output voltage rises
from zero to Vo. t
SS
can be programmed by an external capacitor, which is determined by Equation (1).
t
t
I
C
=
=
O
V
Once C
SS/DEL
is chosen, the soft start delay time t
SSDEL
, the over-current fault latch delay time
t
OCDEL,
and the
delay time t
VccPG
from output voltage (Vo) in regulation to Power Good are fixed and shown in Equations (2), (3),
(4) and (5) respectively.
3
3
CHG
I
09
.
09
.
DISCHG
I
.
)
73
.
=
=
CHG
I
The hiccup mode duty cycle of over current protection is determined by the charge current I
CHG
and discharge
current I
DISCHG
of C
SS/DEL
and is fixed at 9%. However, the hiccup frequency is determined by the load current and
over-current set value.
If faster over-current protection is required, a resistor in series with the soft start capacitor C
SS/DEL
can be used to
reduce the over-current fault latch delay time
t
OCDEL
, and the resistor R
SS/DEL
is determined by Equation (5).
Equation (1) for soft start capacitor C
SS/DEL
and Equation (4) for power good delay time t
VccPG
are unchanged,
while the equation for soft start delay time C
SS/DEL
(Equation 2) is changed to Equation (6).
=
DISCHG
I
O
SS
SS
CHG
DEL
SS
V
6
/
10
66
(1)
6
/
/
10
66
=
=
DEL
SS
DEL
SS
SSDEL
C
C
t
(2)
6
/
/
10
6
=
=
DEL
SS
DEL
SS
OCDEL
C
C
t
(3)
6
/
/
10
66
)
73
O
DEL
SS
O
DEL
SS
VccPG
V
C
V
C
t
(4)
6
/
6
/
10
6
10
6
09
.
09
.
=
DEL
SS
OCDEL
DEL
SS
DISCHG
OCDEL
SSDEL
C
t
C
I
t
R
(5)
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