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參數(shù)資料
| 型號： | ISL6316 |
| 廠商： | Intersil Corporation |
| 英文描述： | Quadruple 2-Input Exclusive-OR Gates 14-SOIC -40 to 85 |
| 中文描述： | 增強4相PWM控制器，用于VR10應用6位VID代碼能夠精確的RDS（ON）或DCR差分電流檢測 |
| 文件頁數(shù)： | 14/29頁 |
| 文件大?。?/td> | 838K |
| 代理商： | ISL6316 |
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14
FN9227.0
August 31, 2005
With the internal low-offset current amplifier, the capacitor
voltage V
C
is replicated across the sense resistor R
ISEN
.
Therefore the current out of ISEN+ pin, I
SEN
, is proportional
to the inductor current.
Equation 5 shows that the ratio of the channel current to the
sensed current I
SEN
is driven by the value of the sense
resistor and the DCR of the inductor.
RESISTIVE SENSING
For accurate current sense, a dedicated current-sense
resistor R
SENSE
in series with each output inductor can serve
as the current sense element (see Figure 5). This technique is
more accurate, but reduces overall converter efficiency due to
the additional power loss on the current sense element
R
SENSE
.
Equation 6 shows the ratio of the channel current to the
sensed current I
SEN
.
MOSFET R
DS(ON)
SENSING
The controller can also sense the channel load current by
sampling the voltage across the lower MOSFET R
DS(ON)
(see Figure 6). The amplifier is ground-reference by
connecting the ISEN- pin to the source of the lower MOSFET.
ISEN+ pin is connected to the PHASE node through the
current sense resistor R
ISEN
. The voltage across R
ISEN
is
equivalent to the voltage drop across the R
DS(ON)
of the
lower MOSFET while it is conducting. The resulting current
out of the ISEN+ pin is proportional to the channel current I
L.
Equation 7 shows the ratio of the channel current to the
sensed current I
SEN
.
R
)
ISEN
Both inductor DCR and MOSFET R
DS(ON)
value will increase
as the temperature increases. Therefore the sensed current
will increase as the temperature of the current sense element
increases. In order to compensate the temperature effect on
the sensed current signal, a Positive Temperature Coefficient
(PTC) resistor can be selected for the sense resistor R
ISEN
,
or the integrated temperature compensation function of
ISL6316 should be utilized. The integrated temperature
compensation function is described in the
Temperature
Compensation
section.
Channel-Current Balance
The sensed current I
n
from each active channel are summed
together and divided by the number of active channels. The
resulting average current I
AVG
provides a measure of the total
load current. Channel current balance is achieved by
comparing the sampled current of each channel to the
average current to make an appropriate adjustment to the
WPM duty cycle of each channel. Intersil’s patented current-
balance method is illustrated in Figure 7. In the figure, the
average current combines with the channel 1 current I
1
to
create an error signal I
ER
. The filtered error signal modifies
the pulse width commanded by V
COMP
to correct any
unbalance and force I
ER
toward zero. The same method for
error signal correction is applied to each active channel.
I
SEN
I
L
ISEN
-----------------
=
(EQ. 5)
I
SEN
I
L
R
ISEN
-----------------------
=
(EQ. 6)
FIGURE 5. SENSE RESISTOR IN SERIES WITH INDUCTORS
I
n
ISEN
IL
RISEN
=
-
+
ISEN-(n)
SAMPLE
&
HOLD
ISL6316 INTERNAL CIRCUIT
ISEN+(n)
R
ISEN(n)
R
SENSE
L
V
OUT
C
OUT
IL
FIGURE 6. MOSFET R
DS(ON)
CURRENT-SENSING CIRCUIT
I
n
ISEN
IL
(
)
RISEN
=
-
+
ISEN+(n)
R
ISEN
(PTC)
SAMPLE
&
HOLD
ISL6316 INTERNAL CIRCUIT
EXTERNAL CIRCUIT
V
IN
N-CHANNEL
MOSFETs
-
+
ILxRDS ON
)
I
L
ISEN-(n)
I
SEN
I
L
--R
=
(EQ. 7)
ISL6316
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