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參數(shù)資料
| 型號(hào)： | ISL6561IRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Multi-Phase PWM Controller with Precision Rds(on) or DCR Differential Current Sensing for VR10.X Application |
| 中文描述： | SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, MLFP, QFN-40 |
| 文件頁數(shù)： | 23/26頁 |
| 文件大?。?/td> | 782K |
| 代理商： | ISL6561IRZ |
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23
FN9098.5
May 12, 2005
voltage deviation is less than the allowable maximum.
Neglecting the contribution of inductor current and regulator
response, the output voltage initially deviates by an amount
The filter capacitor must have sufficiently low ESL and ESR
so that
V <
V
MAX
.
Most capacitor solutions rely on a mixture of high-frequency
capacitors with relatively low capacitance in combination
with bulk capacitors having high capacitance but limited
high-frequency performance. Minimizing the ESL of the high-
frequency capacitors allows them to support the output
voltage as the current increases. Minimizing the ESR of the
bulk capacitors allows them to supply the increased current
with less output voltage deviation.
The ESR of the bulk capacitors also creates the majority of
the output-voltage ripple. As the bulk capacitors sink and
source the inductor ac ripple current (see
Interleaving
and
Equation 2), a voltage develops across the bulk-capacitor
ESR equal to I
C,P
P
(ESR). Thus, once the output capacitors
are selected, the maximum allowable ripple voltage,
V
PP(MAX)
, determines the lower limit on the inductance.
Since the capacitors are supplying a decreasing portion of
the load current while the regulator recovers from the
transient, the capacitor voltage becomes slightly depleted.
The output inductors must be capable of assuming the entire
load current before the output voltage decreases more than
V
MAX
. This places an upper limit on inductance.
Equation 29 gives the upper limit on L for the cases when the
trailing edge of the current transient causes a greater output-
voltage deviation than the leading edge. Equation 30
addresses the leading edge. Normally, the trailing edge
dictates the selection of L because duty cycles are usually
less than 50%. Nevertheless, both inequalities should be
evaluated, and L should be selected based on the lower of
the two results. In each equation, L is the per-channel
inductance, C is the total output capacitance, and N is the
number of active channels.
Input Supply Voltage Selection
The VCC input of the ISL6561 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 3 and 6). Figure 15 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.
V
ESL
(
)
di
dt
----
ESR
(
)
I
+
≈
(EQ. 27)
L
ESR
(
)
V
IN
--------f
NV
OUT
S
V
IN
V
PP MAX
–
V
OUT
)
≥
(EQ. 28)
L
O
I
(
)
2
2NCV
V
MAX
I ESR
)
–
≤
(EQ. 29)
L
(
-1.25
V
MAX
)
NC
)
2
I
I ESR
)
–
V
IN
V
O
–
≤
(EQ. 30)
FIGURE 15. R
T
vs SWITCHING FREQUENCY
100
1000
10000
10
SWITCHING FREQUENCY (kHz)
10
100
1000
R
T
)
R
T
1.0203
10
(
)
10.6258-
1.03167
(
)
f
S
(
)
log
[
]
1200
–
·
=
(EQ. 31)
ISL6561
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參數(shù)描述 |
|---|---|
| ISL6561IRZ-T | 功能描述:IC CTRLR PWM MULTIPHASE 40-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| ISL6562 WAF | 制造商:Intersil Corporation 功能描述: |
| ISL6562CB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ISL6562CB-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
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