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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 22/37頁 |
| 文件大?。?/td> | 1052K |
| 代理商： | TPS5103DB |
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TPS5103
MULTIPLE MODE SYNCHRONOUS DC/DC CONTROLLER
SLVS240 – SEPTEMBER 1999
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
switching frequency
With hysteretic control, the switching frequency is a function of the input voltage, the output voltage, the
hysteresis window, the delay of the hysteresis comparator and the driver, the output inductance, the resistance
in the output inductor, the output capacitance, the ESR and ESL in the output capacitor, the output current, and
the turnon resistance of high side and low side MOSFET. It is a very complex equation if everything is included.
To make it more useful to the designers, a simplified equation only considers the most influential factors. The
tolerance of this equation is about 30%:
s
Vout
(Vin
(V
i
n
ESR
Vout)
(10
(ESR
(10
10
7
Td) Cout)
Lout
Vin
10
7
Td)
0.0097
ESL
Vin)
Where fsis the switching frequency (Hz); Voutis the output voltage (V); Vinis the input voltage (V); Coutis the
output capacitance; ESRis the equivalent series resistance in the output capacitor (
); ESLis the equivalent
series inductance in the output capacitor (H); Loutis the output inductance (H); Td s output feedback RC filter
time constant (S).
In the EVM module design, for the 1.8 V output, for example: Vin = 5 V, Vout = 1.8 V, Cout = 680
μ
F; ESR =
40 m
; ESL = 3 nH; Lout = 6
μ
H; Td = 0.5
μ
s.
Then, the frequency fs = 122 kHz.
output inductor ripple current
The output inductor current ripple can affect not only the efficiency and the inductor saturation, but also the
output voltage capacitor selection. The equation is exhibited as below:
Iripple
Vin
Vout
Iout
Lout
(Rdson
RL)
D
Ts
Where Irippleis the peak-to-peak ripple current (A) through inductor; Vinis the input voltage (V); Voutis
the
output voltage (V); Ioutis the output current; Rdsonis the on-time resistance of MOSFET (
); Dis
the duty
cycle; and Tsis the switching cycle (S). From the equation, it can be seen that the current ripple can be adjusted
by changing the output inductor value.
Example: Vin = 5 V; Vout = 1.8 V; Iout = 5 A; Rdson = 10 m
; RL = 5 m
; D = 0.36; Ts = 10
μ
S; Lout = 6
μ
H
Then, the ripple Iripple = 2 A.
output capacitor RMS current
Assuming the inductor ripple current totally goes through the output capacitor to the ground, the RMS current
in the output capacitor can be calculated as:
Io(rms)
I
12
Where I(orms)is the maximum RMS current in the output capacitor (A);
Iis the peak-to-peak inductor ripple
current (A).
Example:
I = 2 A, so Io(rms) = 0.58 A
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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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