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参数资料
| 型号： | TPS65023RSBT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 3-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC40 |
| 封装： | 5 X 5 MM, GREEN, PLASTIC, QFN-40 |
| 文件页数： | 32/53页 |
| 文件大小： | 1274K |
| 代理商： | TPS65023RSBT |
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I
RMSCout
=V
out
x
1-
V
out
V
in
L x
x
1
2x
3
DVout =Vout
x
1-
V
out
V
in
L x
x
+ESR
(
)
1
8xC
x
out
SLVS670I – JUNE 2006 – REVISED JULY 2010
www.ti.com
A conservative approach is to select the inductor current rating just for the maximum switch current of the
TPS65023, TPS65023B (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 5 and the typical applications for possible inductors.
Table 5. Tested Inductors
DEVICE
INDUCTOR
TYPE
COMPONENT SUPPLIER
VALUE
2.2 mH
LPS4012-222LMB
Coilcraft
All Converters
2.2 mH
VLCF4020T-2R2N1R7
TDK
For DCDC2 or
2.2uH
LQH32PN2R2NN0
Murata
DCDC3
For DCDC1
1.5uH
LQH32PN1R5NN0
Murata
All converters
2.2uH
PST25201B-2R2MS
Cyntec
Output Capacitor Selection
The advanced Fast Response voltage mode control scheme of the inductive converters implemented in the
TPS65023, TPS65023B allow the use of small ceramic capacitors with a typical value of 10 mF 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 6 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:
(6)
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:
(7)
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.
Input Capacitor Selection
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. Each dc-dc converter requires a 10-mF ceramic input capacitor on its input pin VINDCDCx. The
input capacitor is increased without any limit for better input voltage filtering. The VCC pin is separated from the
input for the dc-dc converters. A filter resistor of up to 10R and a 1-mF capacitor is used for decoupling the VCC
pin from switching noise. Note that the filter resistor may affect the UVLO threshold since up to 3 mA can flow via
this resistor into the VCC pin when all converters are running in PWM mode.
38
Copyright 2006–2010, Texas Instruments Incorporated
Product Folder Link(s) : TPS65023, TPS65023B
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相关代理商/技术参数 |
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| TPS65023RSBT | 制造商:Texas Instruments 功能描述:Power Management IC |
| TPS65023RSBTG4 | 功能描述:电池管理 6-Channel Power Management IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TPS650240EVM-331 | 功能描述:电源管理IC开发工具 TPS650240EVM331 Eval Mod RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS650240RHBR | 功能描述:电池管理 Pwr Mgmt ICs for Li-Ion Powered Sys RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| TPS650240RHBRG4 | 功能描述:电池管理 Pwr Mgmt ICs RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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