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AP1520SG-13 PDF预览

AP1520SG-13

更新时间: 2024-10-28 08:31:43
品牌 Logo 应用领域
美台 - DIODES 转换器
页数 文件大小 规格书
9页 238K
描述
PWM CONTROL 2A STEP-DOWN CONVERTER

AP1520SG-13 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:SOIC
包装说明:SOP, SOP8,.25针数:8
Reach Compliance Code:compliantECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.31
模拟集成电路 - 其他类型:SWITCHED CAPACITOR CONVERTER控制模式:VOLTAGE-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:23 V
最小输入电压:3.6 V标称输入电压:12 V
JESD-30 代码:R-PDSO-G8JESD-609代码:e3
长度:5.05 mm湿度敏感等级:1
功能数量:1端子数量:8
最高工作温度:85 °C最低工作温度:-20 °C
最大输出电流:2 A封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装等效代码:SOP8,.25
封装形状:RECTANGULAR封装形式:SMALL OUTLINE
峰值回流温度(摄氏度):260认证状态:Not Qualified
座面最大高度:1.75 mm子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:BUCK
最大切换频率:360 kHz温度等级:COMMERCIAL EXTENDED
端子面层:Matte Tin (Sn)端子形式:GULL WING
端子节距:1.27 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:3.9 mm

AP1520SG-13 数据手册

 浏览型号AP1520SG-13的Datasheet PDF文件第3页浏览型号AP1520SG-13的Datasheet PDF文件第4页浏览型号AP1520SG-13的Datasheet PDF文件第5页浏览型号AP1520SG-13的Datasheet PDF文件第6页浏览型号AP1520SG-13的Datasheet PDF文件第8页浏览型号AP1520SG-13的Datasheet PDF文件第9页 
AP1520  
PWM CONTROL 2A STEP-DOWN CONVERTER  
Functional Description  
PWM Control  
Inductor Selection  
The AP1520 is a DC/DC converter that employs pulse width  
modulation (PWM) scheme. Its pulse width varies in the range of  
0% to 99%, based on the output current loading. The output  
ripple voltage caused by the PWM high frequency switching can  
easily be reduced through an output filter. Therefore, this  
converter provides a low ripple output supply over a broad range  
of input voltage & output current loading  
For most designs, the operation range with inductors is from  
22µH to 33µH. The inductor value can be derived from the  
following equation:  
V
IN VOUT VOUT  
L =  
×
fs× ΔI  
V
IN  
Under Voltage Lockout  
Where ΔIL is inductor Ripple Current. Large value inductors lower  
ripple current and small value inductors result in high ripple  
current. Choose inductor ripple current approximately 15% of the  
maximum load current 2A, IL=0.30A. The DC current rating of  
the inductor should be at least equal to the maximum load current  
plus half the ripple current to prevent core saturation (2A+0.15A).  
The under voltage lockout circuit of the AP1520 assures that the  
high-side MOSFET driver remains in the off state whenever the  
supply voltage drops below 3.3V. Normal operation resumes  
once VCC rises above 3.5V.  
Current Limit Protection  
The current limit threshold is set by external resistor ROCSET  
connected from VCC supply to OCSET pin. The internal sink  
current IOCSET (90μA typical) across this resistor sets the voltage  
at OCSET pin. When the PWM voltage is less than the voltage at  
OCSET, an over-current condition is triggered.  
Input Capacitor Selection  
This capacitor should be located close to the IC using short leads  
and the voltage rating should be approximately 1.5 times the  
maximum input voltage. The RMS current rating requirement for  
the input capacitor of a buck regulator is approximately 12 the  
DC load current. A low ESR input capacitor sized for maximum  
RMS current must be used. A 470µF low ESR capacitor for most  
applications is sufficient.  
The current limit threshold is given by the following equation:  
×
=
×
IPEAK RDS(ON) IOCSET ROCSET  
Output Capacitor Selection  
The output capacitor is required to filter the output voltage and  
provides regulator loop stability. The important capacitor  
parameters are the 100KHz Equivalent Series Resistance (ESR),  
the RMS ripples current rating, voltage rating and capacitance  
value. For the output capacitor, the ESR value is the most  
important parameter. The output ripple can be calculated from  
the following formula.  
(ΔI)  
2
>
+
IPEAK IOUT(MAX)  
where,  
V
IN VOUT VOUT  
ΔI =  
×
=
×ESR  
VRIPPLE ΔIL  
fs×L  
V
IN  
The bulk capacitor’s ESR will determine the output ripple voltage  
and the initial voltage drop after a high slew-rate transient.  
IPEAK is the output peak current; RDS (ON) is the MOSFET ON  
resistance; fS is the PWM frequency (300KHz typical). Also, the  
inductor value will affect the ripple current ΔI.  
An aluminum electrolytic capacitor's ESR value is related to the  
capacitance and its voltage rating. In most case, higher voltage  
electrolytic capacitors have lower ESR values. Most of the time,  
capacitors with much higher voltage ratings may be needed to  
provide the low ESR values required for low output ripple voltage.  
The above equation is recommended for input voltage range of  
5V to 18V. For input voltage lower than 5V or ambient  
temperature over 100°C, higher ROCSET is recommended.  
PCB Layout Guide  
If you need low TC & TJ or large PD (Power Dissipation), The dual  
SW pins (5& 6) and Vss pins(7& 8)on the SOP-8L package are  
internally connected to die pad, The evaluation board should be  
allowed for maximum copper area at output (SW) pins.  
1.  
Connect FB circuits as closely as possible and keep away  
from inductor flux for pure VFB  
.
2.  
3.  
4.  
Connect input capacitor to Vcc and Vss pin as closely as  
possible to get good power filter effect.  
Connect ROCSET to Vcc and OCSET pin as closely as  
possible.  
Connect ground side of the input capacitor & Schottky &  
output capacitor as closely as possible and use ground  
plane for best performance.  
AP1520 Rev. 5  
DS31174  
7 of 9  
www.diodes.com  
JULY 2009  
© Diodes Incorporated  

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