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參數(shù)資料
| 型號： | SC1402 |
| 廠商： | Semtech Corporation |
| 英文描述： | Multi-Output, Low-Noise Power Supply Controller for Notebook Computers |
| 中文描述： | 多輸出，低噪聲電源控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 270K |
| 代理商： | SC1402 |
SC1402
2000 SEMTECH CORP.
652 MITCHELL ROAD
NEWBURY PARK CA 91320
Multi-Output, Low-Noise Power Supply
Controller for Notebook Computers
December 15, 2000
14
Switching Losses Upper FET:
Note: switching losses exist on the upper FET only
because the clamp diode across the lower FET will
turn on prior to the lower FET turning on.
Where Ig is the gate driver current. This is equal to
1A for the SC1402.
Crss is the reverse transfer capacitance of the FET;
in this case it equals 240pF for the IRF7413.
So the total FET losses equate to:
P
FETS
= 0.027+0.072+0.031 = 0.130W
Note that as Vin increases the power dissipation from
switching losses will also increase. This is especially
important if the input to the supply is from an AC
adapter. Therefore, it is necessary to check the cal-
culations with your maximum input voltage specifica-
tion. In addition, the distribution of power in the upper
and lower FET will change as input voltage in-
creases.
Other losses to consider are gate charge losses, in-
ductor switching and copper losses, and losses in the
input and output capacitors. All these items will de-
crease efficiency and need to be carefully analyzed to
obtain the highest efficiency possible, especially if
running off battery power.
Basic Application Circuit
The basic dual-output 3.3V / 5V synchronous buck
converter is shown in Figure 2. This circuit shows the
minimum requirements for successful operation. For
varying current levels, Table 3 provides a useful se-
lection of components for varying supply require-
ments and is based on the calculations described
previously. Input voltage ranges for all designs in the
table are 6.5V to 28V. Frequency used in calculations
is 300KHz.
2A
3A
4A
High & Low
Side FET’s
IR IRF7901D1
Siliconix Si4412
IR IRF7413
Siliconix Si4412
IR IRF7805
Siliconix Si4410
Input
Capacitor
10uF, 30V Sanyo
OS-CON
2 X 10uF, 30V Sanyo
OS-CON
3 X 10uF, 30V Sanyo
OS-CON
Output
Capacitor
330uF, 6.3V/10V*
AVX TPS
2X 330uF, 6.3V/10V*
AVX TPS
4X 330uF, 6.3V/10V*
AVX TPS
Resistor
0.033
,
Dale
WSL2010-R033-F
0.02
, Dale
WSL2010-R020-F
0.012
, Dale
WSL2512-R012-F
Inductor
15uF, Coilcraft
DO-3316P-153
10uF, Coilcraft
DO3316P-103
4.7uF, Coilcraft
DO3316P-472
*10V for 5V SMPS, 6.3V for 3V SMPS
Table 3
0.031W
1
3
300000
12
10
240
I
I
F
V
C
P
2
12
G
OUT
2
IN
RSS
SU
=
=
=
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