- 您現在的位置：買賣IC網 > PDF目錄375723 > FAN5019 (Fairchild Semiconductor Corporation) 6-Bit VID Controller 2-4 Phase VRM10.X Controller PDF資料下載
參數資料
| 型號： | FAN5019 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 6-Bit VID Controller 2-4 Phase VRM10.X Controller |
| 中文描述： | 6西元控制器2-4位控制器相VRM10.X |
| 文件頁數： | 20/30頁 |
| 文件大小： | 781K |
| 代理商： | FAN5019 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
FAN5019
PRODUCT SPECIFICATION
20
REV. 1.0.7 1/5/04
Selecting a Standard Inductor
The companies listed below can provide design consultation
and deliver power inductors optimized for high power
applications upon request.
Power Inductor Manufacturers
Coilcraft
(847)639-6400
www.coilcraft.com
Coiltronics
(561)752-5000
www.coiltronics.com
Sumida Electric Company
(510) 668-0660
www.sumida.com
Vishay Intertechnology
(402) 563-6866
www.vishay.com
Output Droop Resistance
The design requires that the regulator output voltage
measured at the CPU pins drops when the output current
increases. The specified voltage drop corresponds to a DC
output resistance (R
O
).
The output current is measured by summing together the
voltage across each inductor and then passing the signal
through a low-pass filter. This summer-filter is the CS
amplifier configured with resistors R
PH(X)
(summers), and
R
CS
and C
CS
(filter). The output resistance of the regulator is
set by the following equations, where R
L
is the DCR of the
output inductors:
One has the flexibility of choosing either R
CS
or R
PH(X)
.
It is best to select R
CS
equal to 100k
, and then solve for
R
PH(X)
by rearranging Equation 6.
Next, use Equation 7 to solve for C
CS
:
It is best to have a dual location for C
CS
in the layout so stan-
dard values can be used in parallel to get as close to the value
desired. For this example, choosing C
CS
to be 4.7nF is a
good choice. For best accuracy, C
CS
should be a 5% or 10%
NPO capacitor. A close standard 1% value for R
PH(X)
is
100k
.
Inductor DCR Temperature Correction
With the inductor’s DCR being used as the sense element,
and copper wire being the source of the DCR, one needs to
compensate for temperature changes of the inductor’s wind-
ing. Fortunately, copper has a well-known temperature coef-
ficient (TC) of 0.39%/°C.
If R
CS
is designed to have an opposite and equal percentage
change in resistance to that of the wire, it will cancel the
temperature variation of the inductor’s DCR. Due to the non-
linear nature of NTC thermistors, resistors R
CS1
and R
CS2
are needed (see Figure 5) to linearize the NTC and produce
the desired temperature tracking.
Figure 5. Temperature Compensation Circuit
The following procedure and expressions will yield values to
use for R
CS1
, R
CS2
, and R
TH
(the thermistor value at 25°C)
for a given R
CS
value.
1.
Select an NTC to be used based on type and value. Since
we do not have a value yet, start with a thermistor with a
value close to R
CS
. The NTC should also have an initial
tolerance of better than 5%.
2.
Based on the type of NTC, find its relative resistance
value at two temperatures. The temperatures to use that
work well are 50°C and 90°C. We will call these resis-
tance values A (A is R
TH(50°C
)/R
TH(25°C)
) and B (B is
R
TH(90°C)
/R
TH(25°C)
). Note that the NTC’s relative value
is always 1 at 25°C.
3.
Next, find the relative value of R
CS
required for each of
these temperatures. This is based on the percentage
change needed, which we will initially make 0.39%/°C.
We will call these r
1
and r
2
where:
L
X
PH
CS
O
R
R
R
R
×
=
)
(
(6)
CS
L
CS
R
R
L
×
C
=
(7)
CS
O
L
X
PH
R
R
R
R
×
=
)
(
=
×
=
k
k
m
m
R
X
PH
123
100
3
6
)
(
nF
k
m
nH
100
×
C
CS
06
.
6
650
=
=
18
17
16
CSREF
CSSUM
CSCOMP
CSA
C
CS
1.8nF
R
CS1
R
CS2
R
TH
R
PH1
R
PH3
R
PH2
Keep this path as
short as possible
and well away from
Switch Node lines
Place as close as
possible to nearest
inductor or low-side
MOSFET
To Switch Nodes
To V
OUT
sense
(
)
(
)
25
1
1
1
1
×
+
=
T
TC
r
(
)
(
)
25
1
1
2
2
×
+
=
T
TC
r
TC = 0.0039
T
1
= 50°C
T
2
= 90°C
相關PDF資料 |
PDF描述 |
|---|---|
| FAN5026 | Dual DDR/Dual-output PWM Controller |
| FAN5026MTC | Dual DDR/Dual-output PWM Controller |
| FAN5026MTCX | Dual DDR/Dual-output PWM Controller |
| FAN5037 | Isolated Flyback Switching Regulator with 9V Output |
| FAN5037M | Analog IC |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FAN5019_ABC3026B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5019_ABC3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5019_BBC3116B WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5019B | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:6-Bit VID Controller 2-4 Phase VR10.X Controller |
| FAN5019BMTCX | 功能描述:DC/DC 開關控制器 ANG FG PWM 4 pases controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
發(fā)布緊急采購，3分鐘左右您將得到回復。