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| 型号： | TPS65145RGERG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.56 A SWITCHING REGULATOR, 2100 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | GREEN, PLASTIC, QFN-24 |
| 文件页数： | 6/31页 |
| 文件大小： | 1391K |
| 代理商： | TPS65145RGERG4 |
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Output Capacitor Selection
DVout +
Iout
Cout
1
fs
*
Ip
L
Vout ) Vd * Vin
) Ip
ESR
Input Capacitor Selection
Rectifier Diode Selection
SLVS497C – SEPTEMBER 2003 – REVISED APRIL 2006
APPLICATION INFORMATION (continued)
Table 1. Inductor Selection
DEVICE
INDUCTOR VALUE
COMPONENT SUPPLIER
DIMENSIONS / mm
ISAT/DCR
4.7
H
Coilcraft DO1813P-472HC
8,89 x 6,1 x 5
2.6 A/54 m
4.2
H
Sumida CDRH5D28 4R2
5,7 x 5,7 x 3
2.2 A/23 m
4.7
H
Sumida CDC5D23 4R7
6 x 6 x 2,5
1.6 A/48 m
TPS65140
3.3
H
Wuerth Elektronik 744042003
4,8 x 4,8 x 2
1.8 A/65 m
4.2
H
Sumida CDRH6D12 4R2
6,5 x 6, 5 x 1,5
1.8 A/60 m
3.3
H
Sumida CDRH6D12 3R3
6,5 x 6,5 x 1,5
1.9 A/50 m
3.3
H
Sumida CDPH4D19 3R3
5,1 x 5,1 x 2
1.5 A/26 m
3.3
H
Coilcraft DO1606T-332
6,5 x 5,2 x 2
1.4 A/120 m
TPS65145
3.3
H
Sumida CDRH2D18/HP 3R3
3,2 x 3,2 x 2
1.45 A/69 m
4.7
H
Wuerth Elektronik 744010004
5,5 x 3,5 x 1
1 A/260 m
3.3
H
Coilcraft LPO6610-332M
6,6 x 5,5 x 1
1.3 A/160 m
For best output voltage filtering, a low ESR output capacitor is recommended. Ceramic capacitors have a low
ESR value but depending on the application, tantalum capacitors can be used as well. A 22-
F ceramic output
capacitor works for most of the applications. Higher capacitor values can be used to improve load transient
regulation. See Table 2 for the selection of the output capacitor. The output voltage ripple can be calculated as:
with:
IP = Peak switch current as calculated in the previous section with ISW(peak).
L = Selected inductor value
IOUT = Normal load current
fs = Switching frequency
Vd = Rectifier diode forward voltage (typical 0.3 V)
COUT = Selected output capacitor
ESR = Output capacitor ESR value
For good input voltage filtering, low ESR ceramic capacitors are recommended. A 22-
F ceramic input capacitor
is sufficient for most of applications. For better input voltage filtering, this value can be increased. See Table 2
and the typical applications for input capacitor recommendations.
Table 2. Input and Output Capacitors Selection
CAPACITOR
VOLTAGE RATING
COMPONENT SUPPLIER
COMMENTS
22
F/1210
16 V
Taiyo Yuden EMK325BY226MM
CO
22
F/1206
6.3 V
Taiyo Yuden JMK316BJ226
CI
To achieve high efficiency, a Schottky diode should be used. The voltage rating should be higher than the
maximum output voltage of the converter. The average forward current should be equal to the average inductor
current of the converter. The main parameter influencing the efficiency of the converter is the forward voltage
and the reverse leakage current of the diode; both should be as low as possible. Possible diodes are: On
Semiconductor MBRM120L, Microsemi UPS120E, and Fairchild Semiconductor MBRS130L.
14
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