Datasheet > MP8774H

MP8774H

更新时间： 2024-04-09 19:03:29

品牌	Logo	应用领域
芯源 - MPS		软启动
页数	文件大小	规格书
23页	1221K
描述
12A, 3V 至 18V 宽输入, 1.4Mhz 同步降压变换器，集成 PG 和外部软启动功能，采用 3mmx3mm QFN 封装

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

MP8774H 数据手册

MP8774H – 18V, 12A, SYNCHRONOUS, STEP-DOWN CONVERTER

The input voltage ripple can be estimated with

Equation (8):

The maximum output capacitor value (C_{o_max}

can be limited approximately with Equation (13):

)

(13)

C_{O_MAX} (I_{LIM_ AVG}I_OUT)t_ss/V_OUT

I_OUT

V_OUT

V 



(1

)

(8)

f_SWC_IN

Where I_{LIM_AVG}is the average start-up current

during the soft-start period, and t_ssis the soft-

start time.

The worst-case condition occurs at V_IN= 2V_OUT

calculated with Equation (9):

Design Example

I_OUT

V  

(9)

Table 2 shows a design example when ceramic

capacitors are applied.

4 f_SWC_IN

Selecting the Output Capacitor

Table 2: Design Example

An output capacitor is required to maintain the

DC output voltage. Ceramic or POSCAP

capacitors are recommended. The output

voltage ripple can be estimated with Equation

(10):

V_IN

V_OUT

I_OUT

12V

12A

For detailed application schematics, see page

20. The typical performance and waveforms are

shown in the Typical Characteristics section on

page 6. For more devices applications, refer to

the related evaluation board datasheet.

V_OUT

(10)

V_OUT



(1 ^OUT)(R_ESR



)

f_SWL

8f_SWC_OUT

For ceramic capacitors, the capacitance

dominates the impedance at the switching

frequency. The output voltage ripple is mainly

caused by the capacitance. For simplification,

the output voltage ripple can be estimated with

Equation (11):

V_OUT

8f_SW²LC_OUT

V_OUT

(11)

V_OUT



(1

)

For POSCAP capacitors, the ESR dominates

the impedance at the switching frequency. For

simplification, the output ripple can be

estimated with Equation (12):

V_OUT

(1 ^OUT)R_ESR

(12)

V_OUT



f_SWL

In addition to considering the output ripple,

choosing a larger output capacitor can also

result in a better load transient response. Be

sure to consider the maximum output capacitor

limitation in the design application. If the output

capacitor value is too high, the output voltage

cannot reach the design value during the soft-

start time, and fails to regulate.

MP8774H Rev. 1.0

5/22/2019

www.MonolithicPower.com

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

1...15 16 171819 20 21...23

中文翻译

下载PDF

与MP8774H相关器件

型号	品牌	描述	获取价格	数据表
MP8775	EXAR	CMOS 20 MSPS, 8-Bit, High Speed Analog-to-Digital Converter	获取价格
MP8775AN	EXAR	CMOS 20 MSPS, 8-Bit, High Speed Analog-to-Digital Converter	获取价格
MP8775AQ	EXAR	CMOS 20 MSPS, 8-Bit, High Speed Analog-to-Digital Converter	获取价格
MP8775AS	EXAR	CMOS 20 MSPS, 8-Bit, High Speed Analog-to-Digital Converter	获取价格
MP8775E	MPS	Switching Regulator,	获取价格
MP8775EL	MPS	Switching Regulator, Current-mode, 5A, 500kHz Switching Freq-Max, PDSO14, 3 X 4 MM, MO-229	获取价格