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S-8540A15FN-IAAT2G PDF预览

S-8540A15FN-IAAT2G

更新时间： 2024-01-21 07:21:18
品牌 Logo 应用领域
精工 - SII 开关
页数 文件大小 规格书
36页 445K
描述
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

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S-8540A15FN-IAAT2G 数据手册

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Rev.3.2_00  
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM SWITCHABLE  
SWITCHING REGULATOR CONTROLLER  
S-8540/8541 Series  
The S-8540/8541 Series is a family of CMOS step-  
down switching regulator controllers with PWM control  
(S-8540 Series) and PWM/PFM switchover control (S-  
8541 Series). These devices consist of a reference  
voltage source, oscillation circuit, an error amplifier,  
phase compensation circuit, PWM control circuit,  
current limit circuit. A high efficiency and large current  
switching regulator is realized with the help of small  
external components due to the high oscillation  
frequency, 300 kHz and 600 kHz.  
The S-8540 Series provides low-ripple voltage, high  
efficiency, and excellent transient characteristics which  
come from the PMW control circuit capable of varying  
the duty ratio linearly from 0 to 100%, the optimized  
error amplifier, and the phase compensation circuit.  
The S-8541 Series operates under PWM control when  
the duty ratio is 29% or higher and operates under  
PFM control when the duty ratio is less than 29% to  
ensure high efficiency over all load range.  
These controllers serve as ideal main power supply  
units for portable devices due to the high oscillation  
frequencies together with the small 8-Pin MSOP  
package.  
„ Features  
600 kHz (A, B types)  
300 kHz (C, D types)  
• Oscillation frequency  
1.5 to 6.0 V, selectable in 0.1V steps (A, C types)  
• Output voltage  
• Output voltage precision  
• Feed back type for output voltage (FB)  
• External components:  
• Built-in PWM/PFM switchover control  
circuit (S-8541 series)  
• Current limit circuit  
±2.0%  
a transistor, a coil, a diode, and capacitors  
Duty ratio: 29% (PFM control)  
29 to 100% (PWM control)  
Current is set by an external resistor RSENSE  
Time is set by a capacitor CSS and a resistor RSS.  
.
• Soft-start  
• Shutdown function  
• Small package  
8-Pin MSOP  
• Lead-free products  
„ Applications  
• Power supplies for PDAs, electric organizers, and portable devices.  
• Power supplies for audio equipment such as portable CD players and headphone stereos.  
• Main or sub Power supplies for notebook computers and peripheral equipment.  
„ Package  
Package Name  
Drawing Code  
Tape  
Package  
FN008-A  
Reel  
FN008-A  
FN008-A  
8-Pin MSOP  
Seiko Instruments Inc.  
1
1234567...36

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