參數(shù)資料
型號： S-8341A
廠商： Seiko Instruments Inc.
英文描述： PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM/PFM控制，高頻步升開關(guān)穩(wěn)壓器-控制器)
中文描述： PWM / PFM切換控制高頻升壓型開關(guān)穩(wěn)壓器控制器（PWM / PFM切換控制，高頻步升開關(guān)穩(wěn)壓器-控制器）
文件頁數(shù)： 16/38頁
文件大?。?/td> 420K
代理商： S-8341A
PWM Control & PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers
Rev.1.00
S-8340/8341 Series
Seiko Instruments Inc.
15
Note:
Connect IC power pin VDD to VOUT for both fixed output type and external setting type as in the standard circuit
shown on pages 18 and 19. If VDD is inevitably taken from input voltage VIN or other power source, instead of VOUT,
VDD must be raised to 2.5 V or higher within the soft-start time (3.0 ms).
If VDD pin is connected to VOUT, input voltage VIN can be increased slowly without any problems.
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).
Table 1
S-8340
S-8341
A
B
C
D
A
B
C
D
The set output voltage is 6 V or less
Set an output voltage freely
The efficiency under light loads(1mA approx.) 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 "
corresponding series has superiority in that aspect. The symbol "
superiority.
" denotes an indispensable condition, while the symbol "
" indicates that the
" indicates particularly high
2.
Inductor
The inductance value greatly affects the maximum output current I
OUT
and the efficiency .
As the L-value is reduced gradually, the peak current Ipk increases, to finally reach the maximum output
current I
OUT
when the L-value has fallen to a certain point. If the L-value is made even smaller, I
OUT
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 inductor will increase to the detriment of the efficiency.
相關(guān)PDF資料
PDF描述
S-8341B PWM/PFM Control High-Frequency Step-Up Switching Regulator-Controllers(PWM/PFM控制，高頻步升開關(guān)穩(wěn)壓器-控制器)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S-8341A25AFT-T2 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2.5V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8341A25AFT-T2-G 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 2.5V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8341A30AFT-T2 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.0V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8341A30AFT-T2-G 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.0V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
S-8341A33AFT-T2 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 3.3V Step-Up 2.0% RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
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