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产品型号EVAL5985的Datasheet PDF文件预览

EVAL5985  
2 A step-down switching regulator demonstration board  
based on the L5985  
Data Brief  
Features  
2 A DC output current  
2.9 V to 18 V input voltage  
Output voltage adjustable from 0.6 V to 16 V  
250 kHz switching frequency, programmable  
up to 1 MHz  
Internal soft-start and inhibit  
Low dropout operation: 100 % duty cycle  
Zero-load current operation  
Over-current and thermal protection  
VFQFPN8 3 mm x 3 mm package  
EVAL5985  
!-ꢀꢁꢂꢀꢃVꢂ  
Description  
The compensation network on the demonstration  
board allows the use of MLCC as output filter to  
keep the loop stable. The inductor saturation  
current and forward current of the Schottky diode  
are within the current limit values.  
The EVAL5985 demonstration board provides the  
design engineer with a fully functional step-down  
switching regulator with an output current of up to  
2 A. The board integrates STMicroelectronics’  
L5985 step-down switching regulator, together  
with all the external components required for a  
typical application.  
The switching frequency on the demonstration  
board is set to 500 kHz by means of the R5  
resistor connected to pin Fsw.  
The rated voltage of the input capacitor and the  
Schottky diode rectifier repetitive peak reverse  
voltage are both 25 V, making the board capable  
of covering the entire 2.9 V - 18 V input voltage  
range of the L5985 device.  
The board features an external resistor divider  
(R1 and R2) designed for an output voltage  
of 3.3 V.  
The output voltage can be set to a level from 0.6 V  
up to the rated voltage of the output capacitor  
(16 V).  
January 2009  
Rev 1  
1/4  
For further information contact your local STMicroelectronics sales office.  
www.st.com  
1
EVAL5985  
1
EVAL5985 application circuit and component list  
Figure 1.  
Application circuit  
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Figure 2.  
Package  
Table 1.  
Component list  
Part number  
Reference  
Description  
Manufacturer  
C1  
C2  
C3  
C4  
C5  
C6  
R1  
R2  
R3  
R4  
R5  
L1  
GRM31CR61E106KA12  
GRM31CR61C226KE15B  
10 µF, 25 V  
22 µF, 16 V  
2.2 nF, 50 V  
10 nF, 50 V  
220 pF, 50 V  
68 nF, 25 V  
Murata  
Murata  
4.99 kΩ, 1%, 0.1 W 0603  
1.1 kΩ, 1%, 0.1 W 0603  
330 Ω, 1%, 0.1 W 0603  
2.49 kΩ, 1%, 0.1 W 0603  
100 kΩ, 1%, 0.1 W 0603  
6.8 µH, 30%, 2.91 A  
2 A, 25 V  
7447779006  
STPS2L25V  
Wurth Elektronik  
D1  
STMicroelectronics  
2/4  
PCB layout  
EVAL5985  
2
PCB layout  
Figure 3.  
PCB layout (component side)  
Figure 4.  
PCB layout (bottom side)  
Figure 5.  
PCB layout (front side)  
3/4  
EVAL5985  
3
Package mechanical data  
In order to meet environmental requirements, ST offers these devices in different grades of  
®
ECOPACK packages, depending on their level of environmental compliance. ECOPACK®  
specifications, grade definitions and product status are available at: www.st.com.  
®
ECOPACK is an ST trademark.  
4/4  
Revision history  
EVAL5985  
4
Revision history  
Table 2.  
Date  
19-Jan-2009  
Document revision history  
Revision  
Changes  
1
Initial release  
5/4  
EVAL5985  
Please Read Carefully:  
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the  
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any  
time, without notice.  
All ST products are sold pursuant to ST’s terms and conditions of sale.  
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no  
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.  
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this  
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products  
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such  
third party products or services or any intellectual property contained therein.  
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED  
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED  
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS  
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.  
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT  
RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING  
APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY,  
DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE  
GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER’S OWN RISK.  
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void  
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any  
liability of ST.  
ST and the ST logo are trademarks or registered trademarks of ST in various countries.  
Information in this document supersedes and replaces all information previously supplied.  
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.  
© 2009 STMicroelectronics - All rights reserved  
STMicroelectronics group of companies  
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -  
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America  
www.st.com  
4/4  
配单直通车
EVANA产品参数
型号:EVANA
生命周期:Obsolete
包装说明:,
Reach Compliance Code:unknown
风险等级:5.84
执行器方向:VERTICAL
执行器类型:SLIDE
帮派号码:1
JESD-609代码:e2
制造商序列号:EVANA
安装特点:THROUGH HOLE MOUNT
端子数量:3
封装形状:RECTANGULAR PACKAGE
包装方法:BULK; TRAY
额定温度:70 °C
电阻定律:INVERSE LOGARITHMIC; LINEAR; LOGARITHMIC
电阻器类型:POTENTIOMETER
子类别:Variable Resistors
表面贴装:NO
端子面层:TIN COPPER
端子形状:FLAT AND SNAP-IN
Base Number Matches:1
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