參數(shù)資料
型號(hào)： L6732TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, HTSSOP-16
文件頁(yè)數(shù)： 15/37頁(yè)
文件大?。?/td> 898K
代理商： L6732TR
Application details
L6732
22/37
6
Application details
6.1
Inductor design
The inductance value is defined by a compromise between the transient response time, the
efficiency, the cost and the size. The inductor has to be calculated to sustain the output and
the input voltage variation to maintain the ripple current (
I
L) between 20 % and 30 % of the
maximum output current. The inductance value can be calculated with the following
relationship:
Equation 6
Where FSW is the switching frequency, VIN is the input voltage and VOUT is the output
voltage. Figure 17. shows the ripple current vs. the output voltage for different values of the
inductor, with VIN = 5 V and VIN = 12 V at a switching frequency of 500 kHz.
Increasing the value of the inductance reduces the ripple current but, at the same time,
increases the converter response time to a load transient. If the compensation network is
well designed, during a load transient the device is able to set the duty cycle to 100 % or to
0 %. When one of these conditions is reached, the response time is limited by the time
required to change the inductor current. During this time the output current is supplied by
the output capacitors. Minimizing the response time can minimize the output capacitor size.
Figure 17.
Inductor current ripple
Vin
Vout
I
Fsw
Vout
Vin
L
0
1
2
3
4
5
6
7
8
01
2
3
4
OUT P UT V O LT AG E (V )
INDUC
T
O
R
CURR
E
N
T
RI
P
L
Vin=5V, L=500nH
Vin=5V, L=1.5uH
Vin=12V, L=2uH
Vin=12V, L=1uH
相關(guān)PDF資料
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L6788ATR 3-CHANNEL POWER SUPPLY SUPPORT CKT, QCC40
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6733 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6733TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6738 功能描述:電流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6738A 功能描述:電流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6738ATR 功能描述:電流型 PWM 控制器 Single Phase PWM CNTRL Light-Load EFF RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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