參數(shù)資料
型號(hào)： S-8520
廠商： Seiko Instruments Inc.
英文描述： PWM Control Step-Down Switching Regulator-Controller(PWM 控制，步降開(kāi)關(guān)穩(wěn)壓器-控制器)
中文描述： PWM控制降壓型開(kāi)關(guān)穩(wěn)壓控制器（脈寬調(diào)制控制，步降開(kāi)關(guān)穩(wěn)壓器-控制器）
文件頁(yè)數(shù)： 13/30頁(yè)
文件大?。?/td> 650K
代理商： S-8520
PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
S-8520/8521 Series
Rev.6.1
12
Seiko Instruments Inc.
n
Standard Circuits:
(1)
Using a bipolar transistor:
VSS
VOUT
VIN
Cin
L
SD
Cout
ON / OFF
ON / OFF
Figure 8
Reference Voltage
Source with Soft-Start
+
-
PWM or
Switched Control
Circuit
Oscillation
Circuit
VIN
Tr
Cb
Rb
EXT
(2)
Using a Pch MOS-FET transistor
VSS
VOUT
L
SD
Cout
ON / OFF
ON / OFF
Reference Voltage
Source with Soft Start
+
-
PWM or
PWM/PFM-
Switched Control
Circuit
Oscillation
Circuit
VIN
Tr
EXT
VIN
Cin
Figure 9
n
Precautions:
Install the external capacitors, diode, coil, and other peripheral components as close to the IC as possible, and secure
grounding at a single location.
Any switching regulator intrinsically produces a ripple voltage and spike noise, which are largely dictated by the coil and
capacitors in use. When designing a circuit, first test them on actual equipment.
The overload protection circuit of this IC performs the protective function by detecting the maximum duty time (100%). In
choosing the components, make sure that overcurrents generated by short-circuits in the load, etc., will not surpass the
allowable dissipation of the switching transistor and inductor.
Make sure that dissipation of the switching transistor will not surpass the allowable dissipation of the package. (especially at
the time of high temperature)
200
100
0
50
100
150
P
d
P
D
(mW)
Temperature Ta(
0
C)
0
Figure 10. Power dissipation of an SOT-23-5 Package (When Not Mounted)
Seiko Instruments Inc. shall not be responsible for any patent infringement by products including the S-8520/8521 Series in
connection with the method of using the S-8520/8521 Series in such products, the product specifications or the country of
destination thereof.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S-8520A20MC-AVFT2G 功能描述:DC/DC 開(kāi)關(guān)控制器 Step Down SWR PWM 180kHz 60uA Iq RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
S-8520A21MC-AVG-T2 功能描述:DC/DC 開(kāi)關(guān)控制器 2.1V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
S-8520A21MC-AVGT2G 功能描述:DC/DC 開(kāi)關(guān)控制器 2.1V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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
S-8520A25MC-ARK-T2 制造商:SII 制造商全稱:Seiko Instruments Inc 功能描述:PWM CONTROL & PWM/PFM CONTROL STEP-DOWN SWITCHING REGULATOR-CONTROLLERS
S-8520A25MC-AVK-T2 功能描述:DC/DC 開(kāi)關(guān)控制器 2.5V Step-Down PWM RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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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