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參數(shù)資料
| 型號(hào)： | HB14173 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Breake Away Header .025(0.64mm) Square Posts |
| 中文描述： | 破開客場頭.025（0.64毫米）方形崗位 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 230K |
| 代理商： | HB14173 |
6
2005 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC1462
Capacitor Selection
Capacitor selection is based on both the maximum ac-
ceptable ripple voltage and the maximum tolerable drop
at the output.
Ripple
The peak-to-peak output ripple voltage is dependent on
the following factors:
1) Oscillator frequency
2) ESR of C
OUT
3) Capacitance value of C
OUT
Item 1 is xed and depend on the charge pump device
used. Item 2, and 3 can be optimized for best perfor-
mance and reduction of the output ripple.
The following formula could be used for an approximation
for V
OUT_RIPPLE.
V
OUT Drop
The voltage drop at the output is specied with the follow-
ing equation:
V
OUT_DROP = IOUT × ROUT
R
OUT is dependent on the following factors:
1) Oscillator frequency
2) ESR of C
OUT & CBUCKET
3) Capacitance value of C
OUT and CBUCKET
4) Internal switch resistance (R
SW = Total of all 4 switch
resistances).
A good approximation for calculating the output
resistance is shown below.
Applications Information (Cont.)
This equation can be used to calculate C
BUCKET for a spe-
cic V
OUT when VIN and IOUT are known. The maximum value
for the R
SW from the Electrical Characteristics section on
Page 2 should be used in order to nd a worst-case num-
ber.
Layout Consideration
Standard power board layout should be followed to ensure
proper operation. Any stray inductance should be mini-
mized, this can be achieved by using large power planes
or traces, and reducing the distances between input, out-
put and the load. All components should be placed as
close as possible to the SC1462.
The following table shows typical capacitor characteris-
tics.
V
OUT_RIPPLE =
+ 2 × I × ESR_ C
OUT
2 × f
OSC × COUT
I
OUT
R
OUT =
+ 2 × R
SW + 4 × ESR_ CBUCKET + ESR_ COUT
f
OSC × CBUCKET
1
Component
ESR(
Ω)
ESL(nH)
0.1μF Ceramic 0603 Package
0.050
1.60
1.0μF Ceramic 1206 Package
0.040
0.47
10μF Ceramic 0603 Package
0.075
0.50
47μF Ceramic, 16V Tantalum D case
0.100
0.60
330μF, 6.3V “OSCON”
0.025
2.50
330μF, 16V AL. Electrolytic
0.143
2.37
820μF, 4V “OSCON”
0.012
2.50
1000μF, 10V Al. Electrolytic
0.053
5.00
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