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| 型号： | TPS65148RHBR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件页数： | 9/30页 |
| 文件大小： | 947K |
| 代理商： | TPS65148RHBR |
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D1
Q1
V
~-7V/20mA
GL
T1
BC857B
-V
S
D3
D4
R14
5.6kW
D2
BZX84C
7V5
C16
1 F/
16V
m
C17
470nF
C18
470nF
V
S
13.6V/500mA
V
2.5Vto6V
IN
BAT54S
www.ti.com
SLVS904A – MAY 2009 – REVISED JANUARY 2011
Figure 21. Negative Charge Pump
Components Selection
Capacitors (Charge Pumps)
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.
The rated voltage of the capacitor has to be able to withstand the voltage across it. Capacitors rated at 50 V are
enough for most of the applications. Typically a 470-nF capacitance is sufficient for the flying capacitors whereas
bigger values like 1 F or more can be used for the output capacitors to reduce the output voltage ripple.
CAPACITOR
COMPONENT SUPPLIER
COMPONENT CODE
COMMENTS
100 nF/0603
Taiyo Yuden
HMK107BJ104KA
Flying Cap
470 nF/0805
Taiyo Yuden
UMK212BJ474KG
Output Cap 1
1 mF/1210
Taiyo Yuden
HMK325BJ105KN
Output Cap 2
Diodes (Charge Pumps)
For high efficiency, one has to minimize the forward voltage drop of the diodes. Schottky diodes are
recommended. The reverse voltage rating must withstand the maximum output voltage VS of the boost converter.
Usually a Schottky diode with 200 mA average forward rectified current is suitable for most of the applications.
CURRENT
VR
VF / IF
COMPONENT
PACKAGE
RATING IF
SUPPLIER
CODE
TYPE
200 mA
30 V
0.5V / 30mA
International Rectifier
BAT54S
SOT23
Copyright 2009–2011, Texas Instruments Incorporated
17
Product Folder Link(s) :TPS65148
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