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參數(shù)資料
| 型號： | IR3088M |
| 廠商： | International Rectifier |
| 英文描述： | XPHASE PHASE IC WITH FAULT AND OVERTEMP DETECT |
| 中文描述： | XPHASE相集成電路及超溫故障檢測 |
| 文件頁數(shù)： | 16/34頁 |
| 文件大?。?/td> | 688K |
| 代理商： | IR3088M |
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IR3088
MAX
L
FB
O
TOFST
CS
NLOFST
I
O
MAX
L
FB
R
R
n
V
V
R
R
_
_
_
_
=
(15)
O
MIN
CS
MAX
n
L
FB
DRP
R
G
R
R
R
=
_
_
(16)
Body Braking
TM
Related Resistors
R
BBFB
and
R
BBDRP
The body braking
TM
during Dynamic VID can be disabled by connecting BBFB pin to ground. If the feature is
enabled, Resistors R
BBFB
and R
BBDRP
are needed to restore the feedback voltage of the error amplifier after
Dynamic VID step down. Usually R
BBFB
and R
BBDRP
are chosen to match R
FB
and R
DRP
respectively
.
IR3088 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.
)]
ln(
)
[ln(
*
*
*
PWMRMP
V
DAC
V
IN
DAC
V
IN
PWMRMP
SW
IN
O
PWMRMP
R
V
V
C
f
V
V
=
(17)
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
+
+
=
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
.
=
CS
CS
R
R
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.
+
(19)
Page 16 of
34
9/30
/04
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