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參數(shù)資料
| 型號： | ISL6568CRZA-T |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | VP Fixed Series, 500 Ohms, 50.0 W, Fixed, Wirewound Resistor |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封裝： | 5 X 5 MM, LEAD FREE, PLASTIC, MO-220-VHHD, MLPL, QFN-32 |
| 文件頁數(shù)： | 21/28頁 |
| 文件大?。?/td> | 716K |
| 代理商： | ISL6568CRZA-T |
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21
FN9187.3
July 25, 2005
The total gate drive power losses are dissipated among the
resistive components along the transition path and in the
bootstrap diode. The portion of the total power dissipated in the
controller itself is the power dissipated in the upper drive path
resistance, P
DR_UP
, the lower drive path resistance, P
DR_UP
,
and in the boot strap diode, P
BOOT
. The rest of the power will
be dissipated by the external gate resistors (R
G1
and R
G2
) and
the internal gate resistors (R
GI1
and R
GI2
) of the MOSFETs.
Figures 15 and 16 show the typical upper and lower gate
drives’ turn-on transition path. The total power dissipation in the
controller itself, P
DR
, can be roughly estimated as:
Current Balancing Component Selection
The ISL6568 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 24.
r
)
50 10
6
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 25, 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 25 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 ISL6568 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.
FIGURE 16. TYPICAL LOWER-GATE DRIVE TURN-ON PATH
PVCC
Q2
D
S
G
R
GI2
R
G2
R
HI2
C
DS
C
GS
C
GD
R
LO2
LGATE
P
DR
P
DR_UP
P
DR_LOW
P
BOOT
I
Q
VCC
(
)
+
+
+
=
(EQ. 23)
P
DR_UP
R
HI1
R
EXT1
---------------+
R
LO1
R
EXT1
---------------+
+
P
---------------------
=
P
DR_LOW
R
+
R
HI2
R
EXT2
--------------------------------------
R
+
R
LO2
R
EXT2
---------------------------------------
+
P
2
---------------------
=
R
EXT1
R
G1
R
Q1
-------------
+
=
R
EXT2
R
G2
R
Q2
-------------
+
=
P
BOOT
P
---------------------
=
FIGURE 17. ISL6568 INTERNAL AND EXTERNAL CURRENT-
SENSING CIRCUITRY
ISEN(n)
R
ISEN
V
IN
CHANNEL N
UPPER MOSFET
CHANNEL N
LOWER MOSFET
-
+
ILrDS ON
(
)
I
L
ISL6568
R
ISEN
–
-----------------------
I
FL
--N
=
(EQ. 24)
R
ISEN 2
R
ISEN
T
2
T
1
----------
=
(EQ. 25)
ISL6568
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