參數(shù)資料
型號(hào)： ISL6219ACA
廠商： INTERSIL CORP
元件分類： 穩(wěn)壓器
英文描述： Microprocessor CORE Voltage Regulator Precision Multi-Phase BUCK PWM Controller for Mobile Applications
中文描述： SWITCHING CONTROLLER, 1500 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.150 INCH, PLASTIC, QSOP-28
文件頁(yè)數(shù)： 14/17頁(yè)
文件大小： 408K
代理商： ISL6219ACA
14
defined below, there is a separate set of equations for the
compensation components.
In Equations 17, 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
PP
is
the peak-to-peak sawtooth signal amplitude as described in
Figure 5 and
Electrical Specifications
.
Once selected, the compensation values in Equations 17
assure a stable converter with reasonable transient perfor-
mance. 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
Equations 17 unless some performance issue is noted.
The optional capacitor C
2
, is sometimes needed to bypass
noise away from the PWM comparator (see Figure 5). Keep
a position available for C
2
, and be prepared to install a high-
frequency capacitor of between 22pF and 150pF in case any
jitter problem 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 12, 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 chose 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.
In the solutions to the compensation equations, there is a
single degree of freedom. For the solutions presented in
Equations 18, R
FB
is selected arbitrarily. The remaining
compensation components are then selected according to
Equations 18.
2
π
LC
-------------------
f
0
>
R
C
R
FB
2
π
f
V
LC
IN
0.75V
PP
FB
f
0
-----------------------------------
=
C
C
-----------------------------------
=
Case 1:
2
π
LC
-------------------
f
0
)
-----------------------------
<
≤
R
C
R
FB
V
2
π
IN
0.75V
)
f
V
PP
R
FB
LC
(
)
2
f
2
LC
--------------------------------------------
=
C
C
2
π
(
------------------------------------------------------------
=
Case 2:
(EQ. 17)
f
0
)
-----------------------------
>
R
C
R
FB
2
π
f
V
L
IN
)
-----------------------------------------
=
C
C
0.75V
ESR
2
π
V
PP
R
FB
f
0
L
-------------------------------------------------
=
Case 3:
FIGURE 12. COMPENSATION CIRCUIT FOR ISL6219A BASED
CONVERTER WITHOUT LOAD-LINE
REGULATION.
I
COMP
C
C
R
C
R
FB
FB
VSEN
-
+
V
DROOP
C
2
C
1
R
1
R
1
R
FB
LC
–
C ESR
)
----------------------------------------
=
C
1
FB
)
--------------–
=
C
2
0.75V
2
π
(
)
f
0
f
HF
LCR
FB
V
PP
------------------------------------------------------------------
=
(EQ. 18)
R
C
V
2
π
---------------------------------------------------------------------
2
f
f
LC
0.75 V
IN
2
π
f
HF
LC 1
–
=
C
C
0.75V
2
π
V
PP
R
FB
f
0
1
2
π
f
HF
LC
-----------------------------
–
---------------------------------------------------------------------------------
=
ISL6219A
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參數(shù)描述
ISL6219ACA-T 功能描述:IC REG CTRLR BUCK PWM VM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
ISL6219ACAZ 功能描述:IC REG CTRLR BUCK PWM VM 28-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無(wú) 升壓:無(wú) 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF)
ISL6219ACAZ-T 功能描述:IC REG CTRLR BUCK PWM VM 28-QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無(wú) 升壓:無(wú) 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF)
ISL6219CA 制造商:Rochester Electronics LLC 功能描述:- Bulk
ISL6219CA-T 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述:
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