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| 型號： | S-8520E30MC-BJP-T2 |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數(shù)： | 11/37頁 |
| 文件大?。?/td> | 599K |
| 代理商： | S-8520E30MC-BJP-T2 |
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PWM Control & PWM/PFM Control Step-Down Switching Regulator-Controllers
Rev.7.2
S-8520/8521 Series
Seiko Instruments Inc.
11
In making the selection, please keep in mind that the upper limit of the operating voltage range is
either 10 V (A, C, E Series) or 16 V (B, D, F 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
C
S-8521
C
A
B
D
E
F
A
B
D
E
F
An
circuit is required
The input voltage range
exceeds 10V
The efficiency under light
loads(load current
≤
1mA)
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.
overload
protection
2. Inductor
The inductance value greatly affects the maximum output current Iout and the efficiency
η
.
As the L-value is reduced gradually, the peak current Ipk increases, to finally reach the maximum
output current Iout when the L-value has fallen to a certain point. If the L-value is made even smaller,
Iout will begin decreasing because the current drive capacity of the switching transistor becomes
insufficient.
Conversely, as the L-value is augmented, the loss due to Ipk in the switching transistor will decrease
until the efficiency is maximized at a certain L-value. If the L-value is made even larger, the loss due to
the series resistance of the coil will increase to the detriment of the efficiency.
If the L-value is increased in an S-8520/21 Series product, the output voltage may turn unstable in
some cases, depending on the conditions of the input voltage, output voltage, and the load current.
Perform thorough evaluations under the conditions of actual service and decide on an optimum L-
value.
In many applications, selecting a value of A/B/C/D Series 47
μ
H, E, F Series 22
μ
H will allow a S-
8520/21 Series product to yield its best characteristics in a well balanced manner.
When choosing an inductor, pay attention to its allowable current, since a current applied in excess of
the allowable value will
cause the inductor to produce magnetic saturation, leading to a marked decline in efficiency.
Therefore, select an inductor in which the peak current Ipk will not surpass its allowable current at any
moment. The peak current
Ipk is represented by the following equation in continuous operation mode:
(VOUT + VF) x (VIN - VOUT)
2 x fosc x L x (VIN + VF)
I
PK
= IOUT +
Where fosc is the oscillation frequency, L the inductance value of the coil, and VF the forward voltage
of the diode.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| S-8520E30MC-BJPT2G | 功能描述:DC/DC 開關(guān)控制器 3.0V 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-8520E33MC-BJS-T2 | 功能描述:DC/DC 開關(guān)控制器 3.3V 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-8520E33MC-BJST2G | 功能描述:DC/DC 開關(guān)控制器 3.3V 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-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 |
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