參數(shù)資料
型號(hào)： L7980A
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8
封裝： ROHS COMPLIANT, HSOP-8
文件頁(yè)數(shù)： 8/44頁(yè)
文件大?。?/td> 1247K
代理商： L7980A
Application informations
L7980
16/44
Doc ID 15181 Rev 3
Given the physical dimension, ceramic capacitors can meet well the requirements of the
input filter sustaining an higher input RMS current than electrolytic / tantalum types. In this
case the equation of CIN as a function of the target VPP can be written as follows:
Equation 7
neglecting the small ESR of ceramic capacitors.
Considering
η=1, this function has its maximum in D=0.5, thus, given the maximum peak to
peak input voltage (VPP_MAX), the minimum input capacitor (CIN_MIN) value is:
Equation 8
Typically CIN is dimensioned to keep the maximum peak-peak voltage in the order of 1% of
VINMAX
In
Table 6. some multi layer ceramic capacitors suitable for this device are reported
A ceramic bypass capacitor, as close to the VCC and GND pins as possible, so that
additional parasitic ESR and ESL are minimized, is suggested in order to prevent instability
on the output voltage due to noise. The value of the bypass capacitor can go from 100 nF to
1 F.
6.2
Inductor selection
The inductance value fixes the current ripple flowing through the output capacitor. So the
minimum inductance value in order to have the expected current ripple has to be selected.
The rule to fix the current ripple value is to have a ripple at 20%-40% of the output current.
In the continuos current mode (CCM), the inductance value can be calculated by the
following equation:
Table 6.
Input MLCC capacitors
Manufacture
Series
Cap value (
μF)
Rated voltage (V)
Taiyo Yuden
UMK325BJ106MM-T
10
50
GMK325BJ106MN-T
10
35
Murata
GRM32ER71H475K
4.7
50
C
IN
I
O
V
PP
F
SW
---------------------------
1
D
η
----
–
D
η
----
1D
–
()
+
=
C
IN_MIN
I
O
2V
PP_MAX
F
SW
------------------------------------------------
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L7980ATR 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2 A Step-Down Reg 4.5V to 28V 250 kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
L7980TR 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 2A DC 4.5 V to 28 V Adj 0.6V 250 kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
L7981 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3A Step-Down Reg 3A DC 4.5-28V 250Khz RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
L7981A 制造商:STMicroelectronics 功能描述:POWER CONVERSION - Rail/Tube 制造商:STMicroelectronics 功能描述:3A Step-Down Reg 3.7A 4.5 to 28V 1MHz 制造商:ST 功能描述:3A STEP-DOWN SWITCHING REGULATOR
L7981ATR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3 A Step-Down Reg 4.5V to 28V 250 kHz RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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