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AP1537SA PDF预览

AP1537SA

更新时间: 2024-01-02 08:28:10
品牌 Logo 应用领域
易亨 - ANACHIP 转换器
页数 文件大小 规格书
7页 201K
描述
PWM Control 3A Step-Down Converter

AP1537SA 技术参数

生命周期:Obsolete包装说明:,
Reach Compliance Code:unknown风险等级:5.83

AP1537SA 数据手册

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AP1537  
PWM Control 3A Step-Down Converter  
„ Features  
„ General Description  
- Input voltage: 3.6V to 18V.  
AP1537 consists of step-down switching regulator  
with PWM control. These devices include a reference  
voltage source, oscillation circuit, error amplifier,  
internal PMOS and etc.  
- Output voltage: 0.8V to VCC  
.
- Duty ratio: 0% to 100% PWM control  
- Oscillation frequency: 500KHz typ.  
- Soft-start, Current Limit, Enable function  
- Thermal Shutdown function  
AP1537 provides low-ripple power, high efficiency,  
and excellent transient characteristics. The PWM  
control circuit is able to vary the duty ratio linearly  
from 0 up to 100%. This converter also contains an  
error amplifier circuit as well as a soft-start circuit that  
prevents overshoot at startup. An enable function,  
an over current protect function and a short circuit  
protect function are built inside, and when OCP or  
SCP happens, the operation frequency will be  
reduced from 500KHz to 50KHz. Also, an internal  
compensation block is built in to minimum external  
component count.  
- Built-in internal SW P-channel MOS  
- Low ESR output capacitor (Multi-layer chip  
capacitor (MLCC)) application  
- SOP-8L Pb-Free Package.  
„ Applications  
- PC Motherboard  
- LCD Monitor  
- Graphic Card  
- DVD-Video Player  
- Telecom Equipment  
- ADSL Modem  
With the addition of an internal P-channel Power MOS,  
a coil, capacitors, and a diode connected externally,  
these ICs can function as step-down switching  
regulators. They serve as ideal power supply units for  
portable devices when coupled with the SOP–8L  
mini-package, providing such outstanding features as  
low current consumption. Since this converter can  
accommodate an input voltage up to 18V, it is also  
suitable for the operation via an AC adapter.  
- Printer and other Peripheral Equipment  
- Microprocessor core supply  
- Networking power supply  
„ Pin Assignments  
„ Pin Descriptions  
Name  
FB  
Pin  
1
Description  
Vss  
Feedback pin  
1
2
8
7
6
5
FB  
EN  
Power-off pin  
H: Normal operation  
Vss  
EN  
2
(Step-down operation)  
L: Step-down operation stopped  
(All circuits deactivated)  
Compensation pin  
AP1537  
Comp 3  
Output  
Output  
Comp  
3
4
4
VCC  
VCC  
IC power supply pin  
Switch Pin. Connect external  
inductor/diode here. Minimize trace  
area at this pin to reduce EMI.  
GND Pin  
56  
78  
Output  
VSS  
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of  
this product. No rights under any patent accompany the sale of the product.  
Rev. 1. 3 May 09, 2006  
1/7  

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