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參數(shù)資料
| 型號： | S-8520E47MC-BKG-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 |
| 文件頁數(shù)： | 7/43頁 |
| 文件大?。?/td> | 499K |
| 代理商： | S-8520E47MC-BKG-T2 |
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PWM CONTROL, PWM/PFM SWITCHING CONTROL STEP-DOWN SWITCHING REGULATOR
Rev.7.4_20
S-8520/8521 Series
Seiko Instruments Inc.
15
5. 100 % duty cycle
The S-8520/8521 Series operates with a maximum duty cycle of 100 %. When a B, D and F types
products not provided with an overload protection circuit is used, the switching transistor can be kept ON
to supply current to the load continually, even in cases where the input voltage falls below the preset
output voltage value. The output voltage delivered under these circumstances is one that results from
subtracting, from the input voltage, the voltage drop caused by the DC resistance of the inductance and
the on-resistance of the switching transistor.
If an A, C and E types products provided with an overload protection circuit is used, this protection circuit
will function when the 100 % duty state has lasted longer than the preset overload detection time (tpro),
causing the IC to enter intermittent operation mode. Under these conditions, the IC will not be able to
supply current to the load continually, unlike the case described in the preceding paragraph.
Selection of Series Products and Associated External Components
1. Method for selecting series products
The S-8520/8521 Series is classified into 12 types, according to the way the control systems (PWM
control and PWM/PFM Switching control), the different oscillation frequencies, and the inclusion or
exclusion of an overload protection circuit are combined one with another. Please select the type that
best suits your needs by taking advantage of the features of each type described below.
1-1. Control systems
Two different control systems are available: PWM control system (S-8520 Series) and PWM/PFM
switching control system (S-8521 Series).
If particular importance is attached to the operation efficiency while the load is on standby -- for
example, in an application where the load current heavily varies from that in standby state as the load
starts operating -- a high efficiency will be obtained in standby mode by selecting the PWM/PFM
switching control system (S-8521 Series).
Moreover, for applications where switching noise poses a serious problem, the PWM control system
(S-8520 Series), in which the switching frequency does not vary with the load current, is preferable
because it can eliminate ripple voltages easily using a filter.
1-2. Oscillation frequencies
Three oscillation frequencies--180 kHz (A, B types), 60 kHz (C, D types), and 300 kHz (E, F types) --
are available.
Because of their high oscillation frequency and low ripple voltage the A, B, E and F types offer
excellent transient response characteristics. The products in these series allow the use of small-
sized inductors since the peak current remains smaller in the same load current than with products of
the other series. In addition, they can also be used with small output capacitors. These outstanding
features make the A, B, E and F types ideal products for downsizing the associated equipment.
On the other hand, the C and D types, having a lower oscillation frequency, are characterized by a
small self-consumption of current and excellent efficiency under light loads. In particular, the D type,
which employs a PWM/PFM switching control system, enables the operation efficiency to be improved
drastically when the output load current is approximately 100
A. (Refer to “ Reference Data”.)
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| S-8520E50MC-BKJ-T2 | 功能描述:DC/DC 開關控制器 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520E50MC-BKJT2G | 功能描述:DC/DC 開關控制器 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)動器 功能:降壓 輸出配置:正 拓撲: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:300kHz 占空比（最大）:1 同步整流器:無 時鐘同步:無 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 供應商器件封裝:SOT-23-5 標準包裝:1 |
| S-8520E52MC-BKLT2G | 功能描述:DC/DC 開關控制器 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 安裝風格: 封裝 / 箱體:CPAK |
| S-8520F15MC-BNAT2G | 功能描述:DC/DC 開關控制器 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 安裝風格: 封裝 / 箱體:CPAK |
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