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參數(shù)資料
| 型號： | ML4863 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Efficiency Flyback Controller(高效回轉電源控制器) |
| 中文描述： | 高效率反激式控制器（高效回轉電源控制器） |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 118K |
| 代理商： | ML4863 |
ML4863
REV. 1.0 10/12/2000
7
DESIGN CONSIDERATIONS
DESIGN PROCEDURE
A typical design can be implemented by using the
following procedure.
1.
Specify the application by defining:
The maximum input voltage (V
IN(MAX)
)
The mainimum input voltage (V
IN(MIN)
)
The maximum output current (I
OUT(MAX)
)
The maximum output ripple (
V
OUT
)
As a general design rule, the output ripple should be kept
below 100mV to ensure stability.
2.
Select a sense resistor, R
SENSE
, using equation 1.
3a.
Determine the inductance required for the
optimum output ripple using equation 2.
3b.
Determine the minimum inductor current rating
required. The peak inductor current is calculated
using the following formula:
I
mV
R
V
L
LPEAK
SENSE
IN MAX
(
P
=
+
×
235
6
(25 10
)
)
(4)
3c.
Specify the inductor's DC winding resistance. A
good rule of thumb is to allow 5m
, or less, of
resistance per μH of inductance. For minimum
core loss, choose a high frequency core material
such as Kool-Mu, ferrite, or MPP.
3d.
Specify the coupled inductor's turns ratio:
Np : Ns = 1:1
4a.
Calculate the minimum output capacitance
required using:
F
C
I
V
V
V
V
OUT MAX
(
OUT
IN MAX
(
OUT
OUT
=
×
+
I
×
)
)
.5 10
6
(5)
4b.
Establish the maximum allowable ESR for the
ouput capacitor:
R
V
R
mV
ESR
OUT
150
SENSE
<
×
(6)
5.
As a final design check, evaluate the system
stability (no compensation, single pole response)
by using the following equation:
L
N
V
R
V
V
L
OUT
SENSE
OUT
IN MIN
(
P
≤
×
×
+
O
Q
(
)
(
)
)
6 10
6
(7)
where R
SENSE
and L
P
are the actual values to be
used.
See Table 1 for suggested component manufacturers.
Table 1. Component Suppliers
Part
Component Manufacturer
Sense
Dale
Resistors
IRC
Number
Phone
LRC Series
WSL Series
(402) 563-6506
(512) 992-7900
Inductors
Coilcraft
Coiltronics
Dale
R4999
OCTA-PAC Series (561)241-7876
LPE-6562 Series (605) 665-9301
LPT-4545 series
(847) 639-6400
Capacitors
AVX
Sprague
TPS series
593D Series
(207) 282-5111
(207) 324-4140
MOSFETs
National
NDS94XX
NDS99XX
MMDF Series
MMSF Series
Littlefoot Series
(800) 272-9954
Motorola
(602) 897-5056
Siliconix
(408) 988-8000
DESIGN EXAMPLE
1.
Specify the application by defining:
V
IN(MAX)
= 6V
V
IN(MIN)
= 4V
I
OUT(MAX)
= 500mA
V
OUT
= 100mV
2.
Select the sense resistor, R
SENSE
, using Equation 1:
F
5 4
500
20
R
mV
mA
V
6
SENSE
=
×
+
×
×
I
×
4
150
4
05
.
085
.
(1a)
R
SENSE
= 138m
120m
3a.
Determine the inductance required using
equation 2.
L
P
=
×
×
(
)
.
25 10
6
012
6
= 18μH
(2a)
3b.
Determine the minimum inductor current rating
required.
I
mV
m
A
LPEAK
=
+
×
=
235
120
6
18 10
279
.
6
(25 10
)
–6
(4a)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ML4863CS | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4863CS / ES WAF UP | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4863CSX | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4863ES | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Efficiency Flyback Controller |
| ML4863IS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Efficiency Flyback Controller |
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