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參數資料
| 型號： | L6725ATR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOP-16 |
| 文件頁數： | 11/34頁 |
| 文件大?。?/td> | 962K |
| 代理商： | L6725ATR |
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L6725 - L6725A
Application details
19/32
6.2
Output capacitors
The output capacitors are basic components for the fast transient response of the power supply.
For example, during a positive load transient, they supply the current to the load until the
converter reacts. The controller recognizes immediately the load transient and sets the duty
cycle at 100%, but the current slope is limited by the inductor value. The output voltage has a
first drop due to the current variation inside the capacitor (neglecting the effect of the ESL):
Moreover, there is an additional drop due to the effective capacitor discharge that is given by:
Where DMAX is the maximum duty cycle value that in the L6725 is 100%. Usually the voltage
drop due to the ESR is the biggest one while the drop due to the capacitor discharge is almost
negligible. Moreover the ESR value also affects the voltage static ripple, that is:
6.3
Input capacitors
The input capacitors have to sustain the RMS current flowing through them, that is:
Where D is the duty cycle. The equation reaches its maximum value, IOUT /2 with D = 0.5. The
losses in worst case are:
ESR
Iout
Vout
ESR
=
(3)
)
max
min
,
(
2
Vout
D
Vin
Cout
L
Iout
Vout
COUT
=
(4)
L
I
ESR
Vout
=
(5)
)
1
(
D
Iout
Irms
=
(6)
2
)
5
.
0
(
Iout
ESR
P
=
(7)
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| L6730DTR | 20 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| L6725TR | 功能描述:電壓模式 PWM 控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 輸出端數量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| L6726 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_08 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_12 | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726A | 功能描述:開關變換器、穩(wěn)壓器與控制器 Sngl phase PWM controller RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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