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| 型號： | S-8520 |
| 廠商： | Seiko Instruments Inc. |
| 英文描述： | PWM Control Step-Down Switching Regulator-Controller(PWM 控制，步降開關(guān)穩(wěn)壓器-控制器) |
| 中文描述： | PWM控制降壓型開關(guān)穩(wěn)壓控制器（脈寬調(diào)制控制，步降開關(guān)穩(wěn)壓器-控制器） |
| 文件頁數(shù)： | 10/30頁 |
| 文件大小： | 650K |
| 代理商： | S-8520 |
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PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
Rev.6.1
S-8520/8521 Series
Seiko Instruments Inc.
9
n
Selection of Series Products and Associated External Components
1. Method for selecting series products
The S-8520/21 Series is classified into 8 types, according to the way the control systems (PWM and PWM/PFM-Switched), 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.
Control systems:
Two different control systems are available: PWM control system (S-8520 Series) and PWM/PFM-switched 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-switched 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.
Oscillation frequencies:
Two oscillation frequencies--180 kHz (A & B Series) and 60 kHz (C & D Series)--are available.
Because of their high oscillation frequency and low-ripple voltage the A & B Series 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 Series ideal products for downsizing the associated equipment.
On the other hand, the C & D Series, having a lower oscillation frequency, are characterized by a small self-consumption of
current and excellent efficiency under light loads. In particular, the D Series, which employs a PWM/PFM-switched control
system, enables the operation efficiency to be improved drastically when the output load current is approximately 100
m
A. (See
Reference Data.)
Overload protection circuit:
Products can be chosen either with an overload protection circuit (A & C Series) or without one (B & D Series).
Products with an overload protection circuit (A & C Series) enter intermittent operation mode when the overload protection
circuit operates to accommodate overloads or load short-circuiting. This protects the switching elements and inductors.
Nonetheless, in an application where the load needs to be fed continually with a current by taking advantage of the 100% duty
cycle state, even if the input voltage falls below the output voltage value, a B or D Series product will have to be used. Choose
whichever product best handles the conditions of your application.
In making the selection, please keep in mind that the upper limit of the operating voltage range is either 10V (A & C Series) or
16V (B & D Series), depending on whether the product comes with an overload protection circuit built in.
The table below provides a rough guide for selecting a product type depending on the requirements of the application. Choose the
product that gives you the largest number of circles (O).
S-8520
S-8521
A
B
C
D
(E)
(F)
A
B
C
D
(E)
(F)
An overload protection circuit is required
The input voltage range exceeds 10V
The efficiency under light loads is an important factor
To be operated with a medium load current (200 mA
class)
To be operated with a high load current (1 A class)
It is important to have a low-ripple voltage
￥
￥
￥
￥
Importance is attached to the downsizing of external
components
￥
￥
￥
￥
The symbol "
" denotes an indispensable condition, while the symbol "
" indicates that the corresponding series has
superiority in that aspect. The symbol "
￥
" indicates particularly high superiority.
The E and F Series (versions with an oscillation frequency of 300 kHz) are currently under development.
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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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