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| 型号： | TPS65058RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, VQFN-32 |
| 文件页数： | 10/26页 |
| 文件大小： | 1898K |
| 代理商： | TPS65058RGET |
Output Capacitor Selection
I
RMSCout + Vout
1 *
Vout
Vin
L
1
2
3
(5)
DVout + Vout
1 *
Vout
Vin
L
1
8
Cout
)
ESR
(6)
Input Capacitor Selection
SLVS851A – MAY 2008 – REVISED SEPTEMBER 2008................................................................................................................................................... www.ti.com
The advanced Fast Response voltage mode control scheme of the two converters allow the use of small ceramic
capacitors with a typical value of 22
F, without having large output voltage under and overshoots during heavy
load transients. Ceramic capacitors having low ESR values result in lowest output voltage ripple and are
recommended. SeeTable 3 for recommended components.
If ceramic output capacitors are used, the capacitor RMS ripple current rating will always meet the application
requirements. Just for completeness the RMS ripple current is calculated as:
At nominal load, current the inductive converters operate in PWM mode. The overall output voltage ripple is the
sum of the voltage spike, caused by the output capacitor ESR plus the voltage ripple, caused by charging and
discharging the output capacitor:
Where the highest output voltage ripple occurs at the highest input voltage Vin.
At light load currents, the converters operate in Power Save Mode and the output voltage ripple is dependent on
the output capacitor value. The output voltage ripple is set by the internal comparator delay and the external
capacitor. The typical output voltage ripple is less than 1% of the nominal output voltage.
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering, and minimizing the interference with other circuits caused by high input
voltage spikes. The converters need a ceramic input capacitor of 10
F. The input capacitor can be increased
without any limit for better input voltage filtering.
Table 3. Possible Capacitors
TDK
22
F
0805
Ceramic
C2012X5R0J226MT
Taiyo Yuden
22
F
0805
Ceramic
JMK212BJ226MG
Taiyo Yuden
10
F
0805
Ceramic
JMK212BJ106M
10uF
0805
TDK C2012X5R0J106M
Ceramic
18
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s) :TPS65058
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