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參數(shù)資料
| 型號(hào)： | L6725TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Low cost adjustable step-down controller |
| 中文描述： | 低成本可調(diào)降壓控制器 |
| 文件頁數(shù)： | 17/27頁 |
| 文件大小： | 489K |
| 代理商： | L6725TR |
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L6725
Application details
17/27
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 D
MAX
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, I
OUT
/2 with D = 0.5. The
losses in worst case are:
ESR
Iout
Vout
ESR
=
(3)
)
max
min
,
(
2
2
Vout
D
Vin
Cout
L
Iout
Vout
COUT
=
(4)
L
I
ESR
Vout
=
(5)
)
1
D
D
Iout
Irms
=
(6)
2
)
5
Iout
ESR
P
=
(7)
相關(guān)PDF資料 |
PDF描述 |
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| L6728 | Single phase PWM controller with PowerGOOD |
| L6728TR | Single phase PWM controller with PowerGOOD |
| L6731B | Transistor; Type: Amplifiers/Bipolar; VCEO (V): 25; Ic (A): 1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: 0.5; Package: TO-92Mod |
| L6731BTR | Transistor; Type: Amplifiers/Bipolar; VCEO (V): -25; Ic (A): -1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: -0.5; Package: TO-92Mod |
| L6732 | Adjustable step-down controller with synchronous rectification |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(guān)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(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| L6726A_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller |
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