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參數(shù)資料
| 型號： | ISL8102CRZ-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Two-Phase Buck PWM Controller with High Current Integrated MOSFET Drivers |
| 中文描述： | SWITCHING CONTROLLER, PQCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, PLASTIC, MO-220VHHD-2, MLFP-32 |
| 文件頁數(shù)： | 19/27頁 |
| 文件大?。?/td> | 711K |
| 代理商： | ISL8102CRZ-T |
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19
FN9247.0
October 19, 2005
Current Balancing Component Selection
The ISL8102 senses the channel load current by sampling
the voltage across the lower MOSFET r
DS(ON)
, as shown in
Figure 17. The ISEN pins are denoted ISEN1, and ISEN2.
The resistors connected between these pins and the
respective phase nodes determine the gains in the channel
current balance loop.
Select values for these resistors based on the room
temperature r
DS(ON)
of the lower MOSFETs; the full-load
operating current, I
FL
; and the number of phases, N using
Equation 23.
In certain circumstances, it may be necessary to adjust the
value of one or more ISEN resistors. When the components of
one or more channels are inhibited from effectively dissipating
their heat so that the affected channels run hotter than
desired, choose new, smaller values of R
ISEN
for the affected
phases (see the section entitled
Channel Current Balance
).
Choose R
ISEN,2
in proportion to the desired decrease in
temperature rise in order to cause proportionally less current
to flow in the hotter phase.
In Equation 24, make sure that
T
2
is the desired temperature
rise above the ambient temperature, and
T
1
is the measured
temperature rise above the ambient temperature. While a
single adjustment according to Equation 24 is usually
sufficient, it may occasionally be necessary to adjust R
ISEN
two or more times to achieve optimal thermal balance
between all channels.
Load Line Regulation Component Selection (DCR
Current Sensing)
For accurate load line regulation, the ISL8102 senses the
total output current by detecting the voltage across the
output inductor DCR of each channel (As described in the
Load Line Regulation
section). As Figure 18 illustrates, an
R-C network is required to accurately sense the inductor
DCR voltage and convert this information into a “droop”
voltage, which is proportional to the total output current.
Choosing the components for this current sense network is a
two step process. First, R
COMP
and C
COMP
must be
chosen so that the time constant of this R
COMP
-C
COMP
network matches the time constant of the inductor L/DCR.
Then the resistor R
S
must be chosen to set the current
sense network gain, obtaining the desired full load droop
voltage. Follow the steps below to choose the component
values for this R-C network.
1. Choose an arbitrary value for C
COMP
. The recommended
value is 0.01
μ
F.
2. Plug the inductor L and DCR component values, and the
values for C
COMP
chosen in steps 1, into Equation 25 to
calculate the value for R
COMP
.
3. Use the new value for R
COMP
obtained from Equation 25,
as well as the desired full load current, I
FL
, full load droop
voltage, V
DROOP
, and inductor DCR in Equation 26 to
calculate the value for R
S
.
I
DROOP
FIGURE 15. TYPICAL UPPER-GATE DRIVE TURN-ON PATH
FIGURE 16. TYPICAL LOWER-GATE DRIVE TURN-ON PATH
Q1
D
S
G
R
GI1
R
G1
BOOT
R
HI1
C
DS
C
GS
C
GD
R
LO1
PHASE
PVCC
UGATE
PVCC
Q2
D
S
G
R
GI2
R
G2
R
HI2
C
DS
C
GS
C
GD
R
LO2
LGATE
FIGURE 17. ISL8102 INTERNAL AND EXTERNAL CURRENT-
SENSING CIRCUITRY
ISEN(n)
R
ISEN
V
IN
CHANNEL N
UPPER MOSFET
CHANNEL
N
LOWER MOSFET
-
+
IL
x
rDS ON
(
)
I
L
ISL8102
R
ISEN
r
50 10
6
)
–
-----------------------
I
N
-------
=
(EQ. 23)
R
ISEN 2
R
ISEN
T
2
T
1
----------
=
(EQ. 24)
R
COMP
COMP
---------------------------------------
=
(EQ. 25)
R
S
------------------------
R
COMP
DCR
=
(EQ. 26)
ISL8102
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