參數(shù)資料
型號(hào)： TPS5103DB
廠商： Texas Instruments, Inc.
英文描述： MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
中文描述： 多模同步DC / DC控制器
文件頁(yè)數(shù)： 23/37頁(yè)
文件大?。?/td> 1052K
代理商： TPS5103DB
TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240 – SEPTEMBER 1999
23
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
input capacitor RMS current
Assuming the input ripple current totally goes into the input capacitor to the power ground, the RMS current in
the input capacitor can be calculated as:
Ii(rms)
I
2
o
D
(1
D)
1
12
D
Iripple
2
Where Ii(rms)is the input RMS current in the input capacitor (A); Iois the output current (A); Dis the duty cycle.
From the equation, it can be seen that the highest input RMS current usually occurs at the lowest input voltage,
so it is the worst case design for input capacitor ripple current.
Example: Io = 5 A; D = 0.36
Then, Ii(rms)= 3.36 A
softstart
The softstart timing can be adjusted by selecting the soft-start capacitor value. The equation is
Csoft
2
Tsoft
Where C
soft
is the softstart capacitance (
μ
F); T
soft
is the start-up time on softstart terminal (S).
Example: Tsoft = 5 mS, so Csoft = 0.01
μ
F.
current protection
The current protection in TPS5103 is set using an internal current source and an external resistor to set up the
current limit. The sensed high side MOSFET drain-to-source voltage drop is compared to the set point, if the
voltage drop exceeds the limit, the internal oscillator is activated, and it continuously resets the current limit until
the over-current condition is removed. The equation below should be used for calculating the external resistor
value for current protection:
Rcl
Rds(on)
(Itrip
0.000015
Iind(p-p) 2)
PWM or HYS mode
Rcl
Rds(on)
(Itrip
0.000005
Iind(p-p) 2)
SKIP mode
Where Rcl is the external current limit resistor (R10,R11); Rds(on) is the high side MOSFET on-time resistance.
Itrip is the required current limit; Iind(p-p) is the peak-to-peak output inductor current.
Example: PWM mode or HYS mode
Rds(on) = 10 m
, Itrip =5 A, Iind = 2 A, so Rcl = 4 k
Example: SKIP mode
Rds(on) = 10 m
, Itrip = 2 A, Iind = 1 A, so Rcl = 5 k
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TPS5103EVM-136 功能描述:電源管理IC開發(fā)工具 PWM/Hysteretic Buck Contr RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS5103IDB 功能描述:DC/DC 開關(guān)控制器 Synch BuckController RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS5103IDBG4 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS5103IDBR 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
TPS5103IDBRG4 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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