參數(shù)資料
型號： TPS65021RHARG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC40
封裝： 6 X 6 MM, GREEN, PLASTIC, MO-220/VJJD-2, QFN-40
文件頁數(shù)： 31/47頁
文件大小： 1180K
代理商： TPS65021RHARG4
www.ti.com
Output Capacitor Selection
I
RMSCout
=V
out
x
1-
V
out
V
in
L x
x
1
2x
3
(6)
DVout =Vout x
1-
Vout
Vin
L x
x
+ESR
(
)
1
8xC
x
out
(7)
SLVS613B – OCTOBER 2005 – REVISED JULY 2007
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
TPS65021 (2 A for the VDCDC1 and VDCDC2 converters, and 1.5 A for the VDCDC3 converter). The core
material from inductor to inductor differs and has an impact on the efficiency especially at high switching
frequencies.
See Table 4 and the typical applications for possible inductors.
Table 4. Tested Inductors
DEVICE
INDUCTOR
TYPE
COMPONENT SUPPLIER
VALUE
3.3
μH
CDRH2D14NP-3R3
Sumida
3.3
μH
LPS3010-332
Coilcraft
DCDC3 converter
3.3
μH
VLF4012AT-3R3M1R3
TDK
2.2
μH
VLF4012AT-2R2M1R5
TDK
3.3
μH
CDRH2D18/HPNP-3R3
Sumida
DCDC2 converter
3.3
μH
VLF4012AT-3R3M1R3
TDK
2.2
μH
VLCF4020-2R2
TDK
3.3
μH
CDRH3D14/HPNP-3R2
Sumida
3.3
μH
CDRH4D28C-3R2
Sumida
DCDC1 converter
3.3
μH
MSS5131-332
Coilcraft
2.2
μH
VLCF4020-2R2
TDK
The advanced Fast Response voltage mode control scheme of the inductive converters implemented in the
TPS65021 allow the use of small ceramic capacitors with a typical value of 10
μF for each converter without
having large output voltage under and overshoots during heavy load transients. Ceramic capacitors having low
ESR values have the lowest output voltage ripple and are recommended. See Table 5 for recommended
components.
If ceramic output capacitors are used, the capacitor RMS ripple current rating always meets 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 PSM 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.
37
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS65021RHAT 功能描述:電池管理 6-Ch Pwr Mgmt IC for Li-Ion Systems RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65021RHATG4 功能描述:電池管理 6-Ch Pwr Mgmt IC for Li-Ion Systems RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65022RHAR 功能描述:電池管理 Pwr Mgmt IC for Li-Ion Pwred Sys RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65022RHARG4 功能描述:電池管理 Pwr Mgmt IC for Li-Ion Pwred Sys RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
TPS65022RHAT 功能描述:電池管理 Pwr Mgmt IC for Li-Ion Pwred Sys RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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