參數(shù)資料
型號(hào)： L6728TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10
封裝： 3 X 3 MM, LEAD FREE, DFN-10
文件頁(yè)數(shù)： 13/31頁(yè)
文件大?。?/td> 1361K
代理商： L6728TR
Obsolete
Product(s)
- Obsolete
Product(s)
Application information
L6728
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 in consideration the output capacitor charge and discharge as a consequence of the
inductor current ripple.
During a load variation, the output capacitors supplies the current to the load or absorb the
current stored into the inductor until the converter reacts. In fact, even if the controller
recognizes immediately 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 also in this
case depends on the ESR and capacitive charge/discharge as follow:
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
capacitance that do not minimize the voltage deviation during dynamic load variations. On
the contrary, electrolytic capacitors have big capacitance to minimize voltage deviation
during load transients while they does 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 as well as reducing voltage deviation in dynamic
mode.
11.3
Input capacitors
The input capacitor bank is designed considering mainly the input rms current that depends
on the output deliverable current (IOUT) and the duty-cycle (D) for the regulation as follow:
The equation reaches its maximum value, IOUT/2, with D = 0.5. The losses depends on the
input capacitor ESR and, in 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
L6731BTR 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6731B 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L6731D 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
L9230-DIE1 STEPPER MOTOR CONTROLLER, UUC
L9230 STEPPER MOTOR CONTROLLER, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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L6730_09 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Adjustable step-down controller with synchronous rectification
L6730B 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(fēng)格: 封裝 / 箱體:CPAK
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L6730C 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無(wú) 升壓:無(wú) 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產(chǎn)品目錄頁(yè)面:1316 (CN2011-ZH PDF)
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