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參數(shù)資料
| 型號： | ISL6316IRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | MINIATURE TOGGLE SWITCH |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, MO-220-VJJD-2, QFN-40 |
| 文件頁數(shù)： | 25/29頁 |
| 文件大小： | 838K |
| 代理商： | ISL6316IRZ |
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25
FN9227.0
August 31, 2005
The feedback resistor, R
FB
, has already been chosen as
outlined in
Load-Line Regulation Resistor
. Select a target
bandwidth for the compensated system, f
0
. The target
bandwidth must be large enough to assure adequate transient
performance, but smaller than 1/3 of the per-channel
switching frequency. The values of the compensation
components depend on the relationships of f
0
to the L-C pole
frequency and the ESR zero frequency. For each of the three
cases which follow, there is a separate set of equations for the
compensation components.
In Equation 32, L is the per-channel filter inductance divided
by the number of active channels; C is the sum total of all
output capacitors; ESR is the equivalent-series resistance of
the bulk output-filter capacitance; and V
P-P
is the peak-to-
peak sawtooth signal amplitude as described in Figure 7 and
Electrical Specifications
.
The optional capacitor C
2
, is sometimes needed to bypass
noise away from the PWM comparator (see Figure 20). Keep
a position available for C
2
, and be prepared to install a high-
frequency capacitor of between 22pF and 150pF in case any
leading-edge jitter problem is noted.
Once selected, the compensation values in Equation 32
assure a stable converter with reasonable transient
performance. In most cases, transient performance can be
improved by making adjustments to R
C
. Slowly increase the
value of R
C
while observing the transient performance on an
oscilloscope until no further improvement is noted. Normally,
C
C
will not need adjustment. Keep the value of C
C
from
Equation 32 unless some performance issue is noted.
COMPENSATION WITHOUT LOAD-LINE REGULATION
The non load-line regulated converter is accurately modeled
as a voltage-mode regulator with two poles at the L-C
resonant frequency and a zero at the ESR frequency. A
type III controller, as shown in Figure 20, provides the
necessary compensation.
The first step is to choose the desired bandwidth, f
0
, of the
compensated system. Choose a frequency high enough to
assure adequate transient performance but not higher than
1/3 of the switching frequency. The type-III compensator has
an extra high-frequency pole, f
HF
. This pole can be used for
added noise rejection or to assure adequate attenuation at the
error-amplifier high-order pole and zero frequencies. A good
general rule is to choose f
HF
= 10f
0
, but it can be higher if
desired. Choosing f
HF
to be lower than 10f
0
can cause
problems with too much phase shift below the system
bandwidth.
FIGURE 19. COMPENSATION CONFIGURATION FOR
LOAD-LINE REGULATED ISL6316 CIRCUIT
I
COMP
C
C
R
C
R
FB
FB
IDROOP
VDIFF
-
+
V
DROOP
C
2
(OPTIONAL)
2
π
LC
--------1
f
0
>
R
C
R
FB
2
π
f
V
LC
IN
0.75V
π
V
P-P
R
FB
f
0
---------0.75V
=
C
C
2
=
Case 1:
2
π
LC
-------1
f
0
2
C ESR
)
------------1
<
≤
R
C
R
FB
V
2
π
IN
0.75V
)
2
f
02
V
P-P
R
FB
LC
(
)
2
f
0
2
LC
----------0.75 V
=
C
C
2
π
(
---------------------------------------------------------------
=
Case 2:
(EQ. 32)
f
0
π
C ESR
)
2
>
R
C
R
FB
2
π
f
V
L
IN
ESR
(
)
0.75 V
=
C
C
0.75V
ESR
2
π
V
P-P
R
FB
f
0
L
-------------------------------------------- C
=
Case 3:
FIGURE 20. COMPENSATION CIRCUIT FOR ISL6316 BASED
CONVERTER WITHOUT LOAD-LINE
REGULATION
I
COMP
C
C
R
C
R
FB
FB
IDROOP
VDIFF
C
2
C
1
R
1
ISL6316
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