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參數(shù)資料
| 型號： | ISL6567 |
| 廠商： | Intersil Corporation |
| 英文描述： | Dual Low-Noise Wide-Bandwidth Precision Amplifier 8-SOIC -40 to 85 |
| 中文描述： | 多用途兩相降壓PWM控制器集成MOSFET驅(qū)動器 |
| 文件頁數(shù)： | 25/26頁 |
| 文件大?。?/td> | 659K |
| 代理商： | ISL6567 |
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provides the total ripple current as a function of duty cycle
and number of active channels, normalized to the parameter
K
NORM
at zero duty cycle.
V
L F
SW
where L is the channel inductor value.
Find the intersection of the active channel curve and duty
cycle for your particular application. The resulting ripple
current multiplier from the y-axis is then multiplied by the
normalization factor, K
NORM
, to determine the total output
ripple current for the given application.
INPUT CAPACITOR SELECTION
The important parameters for the bulk input capacitors are
the voltage rating and the RMS current rating. For reliable
operation, select bulk input capacitors with voltage and
current ratings above the maximum input voltage and
largest RMS current required by the circuit. The capacitor
voltage rating should be at least 1.25 times greater than the
maximum input voltage. The input RMS current required for
a multi-phase converter can be approximated with the aid
of Figure 28. For a more exact calculation of the input RMS
current use the following equation:
As 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. Figure 28 can be used to determine the input-
capacitor RMS current function of duty cycle, maximum
sustained output current (I
O
), and the ratio of the peak-to-
peak inductor current (I
L,PP
) to the maximum sustained load
current, I
O
.
Use a mix of input bypass capacitors to control the input
voltage ripple. Use ceramic capacitance for the high
frequency decoupling and bulk capacitors to supply the
RMS current. Minimize the connection path inductance of
the high frequency decoupling ceramic capacitors (from
drain of upper MOSFET to source of lower MOSFET).
For bulk capacitance, several electrolytic or high-capacity MLC
capacitors may be needed. For surface mount designs, solid
tantalum capacitors can be used, but caution must be
exercised with regard to the capacitor surge current rating.
These capacitors must be capable of handling the surge-
current at power-up.
APPLICATION SYSTEM DC TOLERANCE
Although the ISL6567 features a tight voltage reference, the
overall system DC tolerance can be affected by the
tolerance of the other components employed. The resistive
divider used to set the output voltage will directly influence
the system DC voltage tolerance. Figure 29 details the
absolute worst case tolerance stack-up for 1% and 0.1%
feedback resistors, and assuming the ISL6567 is regulating
at 0.8% above its nominal reference. Other component
tolerance stack-ups may be investigated using the following
equation, where REF
TM
, R
PTM
, and R
STM
are the tolerance
multipliers corresponding to V
REF
, R
S
, and R
P
, respectively.
K
NORM
--------------------
=
I
TOTAL
K
NORM
K
CM
=
I
IN RMS
)
I
O
2
D
D
2
–
(
)
I
2L PP
------
+
=
0.3
0.1
0
0.2
I
I
/
O
)
FIGURE 28. NORMALIZED INPUT RMS CURRENT vs DUTY
CYCLE FOR A 2-PHASE CONVERTER
0
0.2
0.5
0.1
0.3
0.4
DUTY CYCLE (V
O
/V
IN
)
I
L,PP
= 0
I
L,PP
= 0.5 x I
O
I
L,PP
= 0.75 x I
O
TOL
REF
TM
-----------------------------------------------------------------------------------------------
k
1
–
(
------------------------------------------------------------
)
R
100
R
+
1
–
=
[%]
FIGURE 29. WORST CASE SYSTEM DC REGULATION
TOLERANCE (V
REF
AT 0.8% ABOVE NOMINAL)
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
1
2
3
4
5
6
7
8
9
10
T
k = V
OUT
/V
REF
R
S
TM
= 1.01
R
P
TM
= 0.99
REF
TM
= 1.008
R
P
TM
= 0.999
REF
TM
= 1.008
R
S
TM
= 1.001
ISL6567
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