參數(shù)資料
型號(hào)： FAN5231QSC
廠(chǎng)商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Analog IC
中文描述： 0.34 A SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO28
封裝： PLASTIC, QSOP-28
文件頁(yè)數(shù)： 9/17頁(yè)
文件大?。?/td> 360K
代理商： FAN5231QSC
FAN5231
REV. 1.1.1 8/15/01
9
not the same because the CPU current is significantly lower
as it is illustrated by the following equaton.
I
CPU
= K
CPU
V
CPUi
F
CPUi
K
F
;
Where, K
CPU
— is a processor constant; V
CPUi
— is proces-
sor operating voltage; F
CPUi
— is processor clock frequency;
K
F
— is a coefficient that varies from 0 to 1 and indicates
how heavily processor is engaged by the software; i — is a
denominator associated with the processor mode of opera-
tion (performance or battery optimized).
Figure 4.
This leads to deterioration of the droop benefits in the
battery-optimized mode where they are mostly appreciable,
Fig. 3.
Figure 5.
The FAN5231 incorporates a new proprietary droop
technique specially designed for the SpeedStep-enabled
converters and provides mode-compensated, relatively equal
droop in both, the performance and the battery-optimized
modes. The droop is set as a fraction of the VID programmed
voltage and the gain in the current loop is different for each
VID combination, those providing the droop, which is
compensated for the voltage and the frequency changes
associated with the different CPU modes of operation.
Figure 6.
To accommodate the droop the output voltage of core
converter is raised 2% at no load conditions. The resistor
connected to ISEN1 pin programs the amount of droop.
This resistor sets the gain in the current feedback loop. The
droop is scaled to 5.5% of the VID code when current into
ISEN1 pin equals 75μA.
The output voltage waveforms with droop subjected to load
step are shown on Fig. 4–Fig. 6 .
Feedback Loop Compensation
Due to implemented average current mode control, the
modulator has a single pole response with -1 slope at
frequency determined by load
where Ro – is load resistance, Co – is load capacitance. For
this type of modulator Type 2 compensation circuit is usually
sufficient. To reduce number of external components and
remove the burden at determining compensation components
from a system designer, both PWM controllers have
internally compensated error amplifiers.
Figure 7 shows Type 2 amplifier and its response along with
responses of current mode modulator and the converter. The
Type 2 amplifier, in addition to the pole at origin, has a zero-
pole pair that causes a flat gain region at frequencies in
between the zero and the pole.
Ch1 50mV
Ch2 5.0A
M50μs
1
2
V
CPU
=1.6V
I
CPU
=0.3A>>18A
Ch1 50mV
Ch2 5.0A
M50μs
1
2
V
CPU
=1.35V
I
CPU
= 0.3A>>13 5A
Ch1 50mV
Ch2 5.0A
M50μs
1
2
V
CPU
=1.00V
I
CPU
=0.3A>>12.0A
R
CS
I
R
75
A
)
--------------------------------------
=
F
PO
2
R
0
C
0
-------------1
=
’
F
Z
2
R
2
C
1
-------------1
6
kHz
=
=
;
F
P
2
R
2
C
1
-------------1
600
kHz
=
=
;
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參數(shù)描述
FAN5231QSCX 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 QSOP-28 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
FAN5232 制造商:FAIRCHILD 制造商全稱(chēng):Fairchild Semiconductor 功能描述:Adjustable PWM Buck Controller for LCD PCs
FAN5232_CBC3116B WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
FAN5232MTC 功能描述:DC/DC 開(kāi)關(guān)控制器 DC/DC RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
FAN5232MTC_NL 功能描述:開(kāi)關(guān)變換器、穩(wěn)壓器與控制器 ANG FG RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開(kāi)關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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