參數(shù)資料
型號(hào)： TPS65055RSMR
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 1.8 A DUAL SWITCHING CONTROLLER, 2475 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 4 X 4 MM, GREEN, PLASTIC, QFN-32
文件頁數(shù)： 28/41頁
文件大?。?/td> 1276K
代理商： TPS65055RSMR
Output Capacitor Selection
RMSCout
Vout
1-
1
Vin
I
= Vout
L
2
3
f
Vout
1-
1
Vin
Vout = Vout
×
+ ESR
L
8
Cout
f
D
÷
è
Input Capacitor Selection
SLVS844 – SEPTEMBER 2008.......................................................................................................................................................................................... www.ti.com
The advanced fast response voltage mode control scheme of the two converters allows 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 the lowest output voltage ripple and are
therefore recommended. Refer to Table 4 for recommended components.
If ceramic output capacitors are used, the capacitor RMS ripple current rating always meets the application
requirements. For completeness, the RMS ripple current is calculated as:
At nominal load current the inductive converters operate in PWM mode and 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 interference with other circuits caused by high input
voltage spikes. The converters require a ceramic input capacitor of 10
F. The input capacitor can be increased
without limit for better input voltage filtering.
Table 4. Possible Capacitors
22
F
0805
TDK C2012X5R0J226MT
Ceramic
22
F
0805
Taiyo Yuden JMK212BJ226MG
Ceramic
10
F
0805
Taiyo Yuden JMK212BJ106M
Ceramic
10
F
0805
TDK C2012X5R0J106M
Ceramic
10
F
0603
Taiyo Yuden JMK107BJ106MA
Ceramic
34
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s): TPS65055
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