參數(shù)資料
型號(hào)： ISL6564
廠商： Intersil Corporation
英文描述： PWM Controller with Wide Input Range 8-CDIP -55 to 125
中文描述： 多相PWM控制器，帶有線性6位DAC能精密的RDS（ON）或DCR差分電流檢測(cè)
文件頁(yè)數(shù)： 25/27頁(yè)
文件大小： 798K
代理商： ISL6564
25
FN9156.2
December 27, 2004
Input Supply Voltage Selection
The VCC input of the ISL6564 can be connected either
directly to a +5V supply or through a current limiting resistor
to a +12V supply. An integrated 5.8V shunt regulator
maintains the voltage on the VCC pin when a +12V supply is
used. A 300
resistor is suggested for limiting the current
into the VCC pin to a worst-case maximum of approximately
25mA.
Switching Frequency
There are a number of variables to consider when choosing
the switching frequency, as there are considerable effects on
the upper-MOSFET loss calculation. These effects are
outlined in
MOSFETs
, and they establish the upper limit for
the switching frequency. The lower limit is established by the
requirement for fast transient response and small output-
voltage ripple as outlined in
Output Filter Design
. Choose the
lowest switching frequency that allows the regulator to meet
the transient-response requirements.
Switching frequency is determined by the selection of the
frequency-setting resistor, R
T
(see the figures labeled
Typical Application
on pages 4, 5, 6 and 7). Figure
23
and
Equation 31 are provided to assist in selecting the correct
value for R
T
.
Input Capacitor Selection
The input capacitors are responsible for sourcing the ac
component of the input current flowing into the upper
MOSFETs. Their RMS current capacity must be sufficient to
handle the ac component of the current drawn by the upper
MOSFETs which is related to duty cycle and the number of
active phases.
For a two phase design, use Figure 24 to determine the
input-capacitor RMS current requirement given the duty
cycle, maximum sustained output current (I
O
), and the ratio
of the per-phase peak-to-peak inductor current (I
L,PP
) to I
O
.
Select a bulk capacitor with a ripple current rating which will
minimize the total number of input capacitors required to
support the RMS current calculated. The voltage rating of
the capacitors should also be at least 1.25 times greater
than the maximum input voltage.
Figures 24 and 25 provide the same input RMS current
information for three and four phase designs respectively.
Use the same approach to selecting the bulk capacitor type
and number as described above.
Low capacitance, high-frequency ceramic capacitors are
needed in addition to the bulk capacitors to suppress leading
and falling edge voltage spikes. The result from the high
current slew rates produced by the upper MOSFETs turn on
FIGURE 20. R
T
vs SWITCHING FREQUENCY
100
1000
10000
10
SWITCHING FREQUENCY (kHz)
10
100
1000
R
T
)
R
T
10
10.886
1.0792
f
S
(
)
log
–
[
]
=
(EQ. 30)
0.3
0.1
0
0.2
I
R
/
O
)
FIGURE 21. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 2-PHASE CONVERTER
0
0.4
1.0
0.2
0.6
0.8
DUTY CYCLE (V
O
/V
IN
)
I
L,PP
= 0
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
DUTY CYCLE (V
O/
V
IN
)
FIGURE 22. NORMALIZED INPUT-CAPACITOR RMS CURRENT
vs DUTY CYCLE FOR 3-PHASE CONVERTER
0
0.4
1.0
0.2
0.6
0.8
I
R
I
O
)
0.3
0.1
0
0.2
I
L,PP
= 0
I
L,PP
= 0.25 I
O
I
L,PP
= 0.5 I
O
I
L,PP
= 0.75 I
O
ISL6564
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