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參數(shù)資料
| 型號(hào)： | ML4863 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Efficiency Flyback Controller(高效回轉(zhuǎn)電源控制器) |
| 中文描述： | 高效率反激式控制器（高效回轉(zhuǎn)電源控制器） |
| 文件頁數(shù)： | 8/10頁 |
| 文件大小： | 118K |
| 代理商： | ML4863 |
ML4863
8
REV. 1.0 10/12/2000
Figure 3. 5V, 2A Circuit
Figure 2. 5V, 1A Circuit
47μF
VIN
NDS9955
1μF
Coiltronics
CTX20-4
100m
VOUT
5V, 1A
400μF
ML4863
VIN
SENSE
SHDN
VFB
GND
OUT 2
OUT 1
VCC
100μF
VIN
NDS9410
NDS9410
1μF
Dale
LPE6562
50m
VOUT
5V, 2A
800μF
ML4863
VIN
SENSE
SHDN
VFB
GND
OUT 2
OUT 1
VCC
DESIGN CONSIDERATIONS
(Continued)
3c.
Specify the inductor’s DC winding resistance:
L
DCR
= 90m
3d.
Specify the coupled inductor's turn ratio:
Np : Ns = 1:1
4a.
Calculate the minimum output capacitance
required using equation 5.
C
=
×
F
I
×
01
.
050
.
5 6
5
25 10
.
6
= 55μF
(5a)
4b.
Establish the maximum ESR for the output
capacitor using equation 6.
R
mV
ESR
<
01 012
150
.
.
= 80m
(6a)
Based on these calculations, the design should use two
100μF capacitors, with an ESR of 100m
each, in parallel
to meet the capacitance and ESR requirements.
5.
As a final design check, evaluate the system
stability using equation 7.
100
6 10
(
012
18 10
5 4
(
–6
6
mV
≤
×
×
L
O
)
.
)
= 360mV (7a)
Since the inequality is met, the circuit should be stable.
Some typical application circuits are shown in Figures 2, 3,
and 4.
LAYOUT
Good PC board layout practices will ensure the proper
operation of the ML4863. Important layout considerations
follow:
The connection from the current sense resistor to the
SENSE pin of the ML4863 should be made by a
separate trace and connected right at the sense resistor
lead.
The V
CC
bypass capacitor needs to be located close to
the ML4863 for adequate filtering of the IC's internal
bias voltage.
Trace lengths from the capacitors to the inductor, and
from the inductor to the FET should be as short as
possible to minimize noise and ground bounce.
Power and ground planes must be large enough to
handle the current the converter has been designed for.
See Figure 5 for a sample PC board layout.
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相關(guān)代理商/技術(shù)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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