參數(shù)資料
型號(hào)： S-8520E35MC-BJU-T2
元件分類： 穩(wěn)壓器
英文描述： 0.05 A SWITCHING CONTROLLER, 375 kHz SWITCHING FREQ-MAX, PDSO5
封裝： SOT-23, 5 PIN
文件頁(yè)數(shù)： 5/43頁(yè)
文件大小： 499K
代理商： S-8520E35MC-BJU-T2
PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-DOWN SWITCHING REGULATOR
Rev.7.4_20
S-8520/8521 Series
Seiko Instruments Inc.
13
Operation
1. Step-down DC-DC Converter
1-1. PWM control (S-8520 Series)
The S-8520 Series consists of DC-DC converters that employ a pulse-width modulation (PWM)
system. This series is characterized by its low current consumption. In conventional PFM system
DC-DC converters, pulses are skipped when they are operated with a low output load current, causing
variations in the ripple frequency of the output voltage and an increase in the ripple voltage. Both of
these effects constitute inherent drawbacks to those converters.
In converters of the S-8520 Series, the pulse width varies in a range from 0 to 100 %, according to the
load current, and yet ripple voltage produced by the switching can easily be removed through a filter
because the switching frequency remains constant. Therefore, these converters provide a low-ripple
power over broad ranges of input voltage and load current.
1-2. PWM/PFM switching control (S-8521 Series)
The S-8521 Series consists of DC-DC converters capable of automatically switching the pulse-wide
modulation system (PWM) over to the pulse-frequency modulation system (PFM), and vice versa,
according to the load current. This series of converters features low current consumption.
In a region of high output load currents, the S-8521 Series converters function with PWM control,
where the pulse-width duty varies from 25 to 100 %. This function helps keep the ripple power low.
For certain low output load currents, the converters are switched over to PFM control, whereby pulses
having their pulse-width duty fixed at 25 % are skipped depending on the quantity of the load current,
and are output to a switching transistor. This causes the oscillation circuit to produce intermittent
oscillation. As a result, current consumption is reduced and efficiency losses are prevented under
low loads. Especially for output load currents in the region of
100
A, these DC-DC converters can operate at extremely high efficiency.
2.
OFF
ON/
pin (Shutdown pin)
This pin deactivates or activates the step-down operation. When the
OFF
/
ON
pin is set to "L", the VIN
voltage appears through the EXT pin, prodding the switching transistor to go off. All the internal circuits
stop working, and substantial savings in current consumption are thus achieved.
The
OFF
/
ON
pin is configured as shown in Figure 7. Since pull-up or pull-down is not performed
internally, please avoid operating the pin in a floating state. Also, try to refrain from applying a voltage of
0.3 to 1.8 V to the pin, lest the current consumption increase. When this
OFF
/
ON
pin is not used,
leave it coupled to the VIN pin.
Table 8
OFF
/
ON
pin
CR Oscillation Circuit
Output Voltage
“H”
Activated
Set value
“L”
Deactivated
VSS
OFF
/
ON
VIN
VSS
Figure 7
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S-8520E50MC-BKJ-T2 功能描述:DC/DC 開關(guān)控制器 5.0V Step-Down PWM 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
S-8520E50MC-BKJT2G 功能描述:DC/DC 開關(guān)控制器 5.0V Step-Down PWM 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
S-8520E50MC-BKJT2U 功能描述:IC REG CTRLR BUCK SOT23-5 制造商:ablic u.s.a. inc. 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 輸出類型:晶體管驅(qū)動(dòng)器 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出數(shù):1 輸出階段:1 電壓 - 電源（Vcc/Vdd）:2.5 V ~ 10 V 頻率 - 開關(guān):300kHz 占空比（最大）:1 同步整流器:無(wú) 時(shí)鐘同步:無(wú) 串行接口:- 控制特性:使能 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:SC-74A，SOT-753 供應(yīng)商器件封裝:SOT-23-5 標(biāo)準(zhǔn)包裝:1
S-8520E52MC-BKLT2G 功能描述:DC/DC 開關(guān)控制器 Step Down SWR PWM 300kHz 100uA Iq 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
S-8520F15MC-BNAT2G 功能描述:DC/DC 開關(guān)控制器 Step Down SWR PWM 300kHz 100uA Iq 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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