- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄97995 > L6728D (STMICROELECTRONICS) 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10 PDF資料下載
參數(shù)資料
| 型號： | L6728D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 30 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, ROHS COMPLIANT, DFN-10 |
| 文件頁數(shù)： | 14/33頁 |
| 文件大?。?/td> | 1215K |
| 代理商： | L6728D |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁當前第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁
L6728D
Application information
Doc ID 16498 Rev 1
21/33
11.2
Output capacitor(s)
The output capacitors are basic components to define the ripple voltage across the output
and for the fast transient response of the power supply. They depend on the output voltage
ripple requirements, as well as any output voltage deviation requirement during a load
transient.
During steady-state conditions, the output voltage ripple is influenced by both the ESR and
capacitive value of the output capacitors as follow:
Where
ΔI
L is the inductor current ripple. In particular, the expression that defines ΔVOUT_C
takes into consideration the output capacitor charge and discharge as a consequence of the
inductor current ripple.
During a load variation, the output capacitor supplies the current to the load or absorbs the
current stored into the inductor until the converter reacts. In fact, even if the controller
immediately recognizes the load transient and sets the duty cycle at 80% or 0%, the current
slope is limited by the inductor value. The output voltage has a drop that, in this case also,
depends on the ESR and capacitive charge/discharge as follows:
Where
ΔV
L is the voltage applied to the inductor during the transient response
(
for the load appliance or VOUT for the load removal).
MLCC capacitors have typically low ESR to minimize the ripple but also have low
capacitances that do not minimize the voltage deviation during dynamic load variations. On
the contrary, electrolytic capacitors have big capacitances to minimize voltage deviation
during load transients, while they do not show the same ESR values of the MLCC resulting
then in higher ripple voltages. For these reasons, a mix between electrolytic and MLCC
capacitor is suggested to minimize ripple and reduce voltage deviation in dynamic mode.
11.3
Input capacitors
The input capacitor bank is designed considering mainly the input RMS current, which
depends on the output deliverable current (IOUT) and the duty cycle (D) for regulation as
follows:
The equation reaches its maximum value, IOUT/2, with D = 0.5. The losses depend on the
input capacitor’s ESR and, in the worst case, are:
ΔV
OUT_ESR
ΔI
L
ESR
=
ΔV
OUT_C
ΔI
L
1
8C
OUT
F
SW
---------------------------------------
=
ΔV
OUT_ESR
ΔI
OUT
ESR
=
ΔV
OUT_C
ΔI
OUT
L
ΔI
OUT
2C
OUT
ΔV
L
--------------------------------------
=
D
MAX
V
IN
V
OUT
–
I
rms
I
OUT
D1
D
–
()
=
PESR
I
OUT 2
()
2
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| L6911C | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6911DTR | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6911E | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6911ETR | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| L6924U013 | POWER SUPPLY SUPPORT CKT, PQCC16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6728DTR | 功能描述:電流型 PWM 控制器 Single-Phase PWM 5V to 12V Controller RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6728H | 功能描述:電壓模式 PWM 控制器 Sgl Output 300 KHz DFN-10 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)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 |
| L6728HTR | 功能描述:電流型 PWM 控制器 SINGLE PHASE PWM CNTRL PWR GOOD RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6728TR | 功能描述:DC/DC 開關(guān)控制器 Sngl phase PWM controller 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 安裝風格: 封裝 / 箱體:CPAK |
| L6730 | 功能描述:DC/DC 開關(guān)控制器 Adjustable Step Down Controller 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 安裝風格: 封裝 / 箱體:CPAK |
發(fā)布緊急采購，3分鐘左右您將得到回復。