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S-8541C15FN-IGKT2G PDF预览

S-8541C15FN-IGKT2G

更新时间： 2024-11-06 00:25:11
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精工 - SII 开关
页数 文件大小 规格书
36页 2114K
描述
SWITCHABLE SWITCHING REGULATOR CONTROLLER

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S-8541C15FN-IGKT2G 数据手册

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S-8540/8541 Series  
STEP-DOWN, 600 kHz PWM CONTROL or PWM/PFM  
SWITCHABLE SWITCHING REGULATOR CONTROLLER  
www.sii-ic.com  
© SII Semiconductor Corporation, 2000-2010  
Rev.4.0_01  
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)  
2.0%  
• Output voltage  
• Output voltage precision  
• Feed back type for output voltage (FB)  
• External components:  
• Built-in PWM/PFM switchover control  
circuit (S-8541 series)  
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.  
.
• Current limit circuit  
• Soft-start  
• Shutdown function  
• Lead-free, halogen-free*1  
*1. Refer to “Product Name Structure” for details.  
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  
• 8-Pin MSOP  
1
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