NCP1529 Series 1.7 MHz, 1 A, High Efficiency, Low Ripple
Contents
1. se of Jet Hdaa zc m REN EHABLE Figure 10 Part Layout in TSOP 5 http onsemi com 10 NCP1529ASNT1GEVB NCP1529MUTBGEVB ra L P snm atl 1 TOP dum gambe ER Li O a d E Figure 11 Top Layer Routing in TSOP 5 Figure 12 Ground Layer Routing in TSOP 5 http onsemi com 11 NCP1529ASNT1GEVB NCP1529MUTBGEVB Figure 13 Power Layer Routing in TSOP 5 Figure 14 Bottom Layer Routing in TSOP 5 http onsemi com 12 NCP1529ASNT1GEVB NCP1529MUTBGEVB NCP1529 PCB LAYOUT OF UDFN 6 DEMO BOARD Board reference TLS P 003 A 0907 BBR MN gu M P 15829 1A DEDE Converter VIL HOLSNONOSIWIS ND SELEC R1 EI tz H48 4060 G 00 d e Figure 15 Assembly Layer in UDFN6 Figure 16 Part Layout in UDFN 6 http onsemi com 13 NCP1529ASNT1GEVB NCP1529MUTBGEVB Li Era aa Jal f m Figure 18 Ground Layer Routing in UDFN6 http onsemi com 14 NCP1529ASNT1GEVB NCP1529MUTBGEVB Figure 19 Power Layer Routing in UDFN 6 Figure 20 Bottom Layer Routing in UDFN6 http onsemi com 15 NCP1529ASNT1GEVB NCP1529MUTBGEVB ON Semiconductor and ON are registered trademarks of Semiconductor Components Industries LLC SCILLC SCILLC reserves the right to make changes with2. death associated with such unintended or unauthorized use even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part SCILLC is an Equal Opportunity Affirmative Action Employer This literature is subject to all applicable copyright laws and is not for resale in any manner PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT N American Technical Support 800 282 9855 Toll Free ON Semiconductor Website www onsemi com Literature Distribution Center for ON Semiconductor USA Canada P O Box 5163 Denver Colorado 80217 USA Europe Middle East and Africa Technical Support Order Literature http www onsemi com orderlit Phone 303 675 2175 or 800 344 3860 Toll Free USA Canada Phone 421 33 790 2910 Fax 303 675 2176 or 800 344 3867 Toll Free USA Canada Japan Customer Focus Center For additional information please contact your local Email orderlit onsemi com Phone 81 3 5817 1050 Sales Representative EVBUM2106 D
3. 2 01 GND2 Molex Waldom 90120 0160 EN SW 4 Test Point Type 3 NA NA f 1 60mm Keystone 5010 VIN VOUT PCB 1 87 mm x 57 mm x NA NA NA Any TLS P 003 A 0907 1 0 mm 4 Layers BBR Table 8 BOM IN UDFN 6 PACKAGE Toler Manufacturer Designator Qty Description Value ance Part Number U1 1 IC Converter NA NA UDFN6 ON Semiconductor NCP1529 DC DC C1 1 Ceramic capacitor 4 7 uF 6 3 V 10 0603 TDK C1608X5R0J475 X5R C2 1 Ceramic capacitor 10 uF 6 3 V 10 0603 TDK C1608X5R0J106 X5R COG R1 R2 ES SMD resistor 150k 0603 VIN a s Connector Emerson Network 111 2223 001 Power Connectivity Solutions ENABLE 3 Pin Jumper 2 54mm TYCO AMP 5 826629 0 Header Molex Waldom 90120 0160 SELECT J1 2x2 Pin Jumper 2 54mm TYCO AMP 6 166591 5 Header Molex Waldom 90131 0140 GND1 Jumper for GND NA 10 16mm Harwin D3082 01 GND2 Molex Waldom 90120 0160 EN SW 4 Test point type 3 NA NA p Keystone 5010 VIN VOUT 1 60mm PCB 1 87mm x 57mm x NA NA NA Any TLS P 003 A 0907 1 0 mm BBR 4 Layers http onsemi com 8 NCP1529ASNT1GEVB NCP1529MUTBGEVB NCP1529 PCB LAYOUT GUIDELINES LAYOUT CONSIDERATIONS Electrical Layout Considerations Implementing a high frequency DC DC converter requires respect of some rules to get a powerful portable application Good layout is key to prevent switching regulators to generate noise to application and to themselves Electrical layout guide lines are e Use short and large traces when large amount of current is
4. FN6 Package RoJA Thermal Resistance using UDFN6 Recommended Board Layout Note 8 40 Operating Ambient Temperature Range Notes 6 and 7 40 to 85 pou A Storage Temperature Range 55 to 150 possc Junction Operating Temperature Notes 6 and 7 40 to 125 Latchup Current Maximum Rating TA 85 C Note 4 Other Pins ESD Withstand Voltage Note 3 Vesd Human Body Model 2 0 kV Machine Model 200 V Moisture Sensitivity Level Note 5 per IPC Stresses exceeding Maximum Ratings may damage the device Maximum Ratings are stress ratings only Functional operation above the Recommended Operating Conditions is not implied Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability 1 Maximum electrical ratings are defined as those values beyond which damage to the device may occur at TA 25 C 2 According to JEDEC standard JESD22 A108B 3 This device series contains ESD protection and exceeds the following tests Human Body Model HBM per JEDEC standard JESD22 A114 Machine Model MM per JEDEC standard JESD22 A115 Latchup current maximum rating per JEDEC standard JESD78 JEDEC Standard J STD 020A In applications with high power dissipation low Viv high lour special care must be paid to thermal dissipation issues Board design considerations thermal dissipation vias traces or planes and PCB material can significantly improve junction to air thermal resistance Rega for more informati
5. NCP1529ASNT1GEVB NCP1529MUTBGEVB NCP1529 Series 1 7 MHz 1 A High Efficiency Low Ripple Adjustable Output Voltage Step down Converter Evaluation Board User s Manual Overview The NCP1529 step down DC DC converter is a monolithic integrated circuit for portable applications powered from one cell Li ion or three cell Alkaline NiCd NiMH batteries The device available in an adjustable output voltage from 0 9 V to 3 9 V is able to deliver up to 1 A It uses synchronous rectification to increase efficiency and reduce external part count The device also has a built in 1 7 MHz nominal oscillator which reduces component size by Figure 1 NCP1529ASNT1GEVB Board Picture in TSOP 5 Semiconductor Components Industries LLC 2012 April 2012 Rev 1 ON Semiconductor http onsemi com EVAL BOARD USER S MANUAL allowing a small inductor and capacitors Automatic switching PWM PFM mode offers improved system efficiency Additional features include integrated soft start cycle by cycle current limiting and thermal shutdown protection The NCP1529 is available in a space saving low profile 2x2 x 0 5 mm UDFN6 package and TSOP 5 package Figure 2 NCP1529MUTBGEVB Board Picture in UDFN 6 Publication Order Number EVBUM 2106 D NCP1529ASNT1GEVB NCP1529MUTBGEVB Table 1 MAXIMUM RATINGS Thermal Resistance using TSOP 5 Recommended Board Layout Note 8 Thermal Resistance Junction to Air UD
6. d be back around 0 3 uA NCP1529 COMPONENTS SELECTION Input Capacitor Selection In PWM operating mode the input current is pulsating with large switching noise Using an input bypass capacitor can reduce the peak current transients drawn from the input supply source thereby reducing switching noise significantly The capacitance needed for the input bypass capacitor depends on the source impedance of the input supply The maximum RMS current occurs at 50 duty cycle with maximum output current which is IO max 2 For NCP1529 a low profile ceramic capacitor of 4 7 UF should be used for most of the cases For effective bypass results the input capacitor should be placed as close as possible to the VIN Pin Table 3 LIST OF INPUT CAPACITOR GRM21BR71C475KA Taiyo Yuden JMK212BY475MG 4 7 uF TDK C2012X5R0J475KT 4 7 uF C1608X5R0J475KT Output L C Filter Design Considerations The NCP1529 operates at 1 7 MHz frequency and uses current mode architecture The correct selection of the output filter ensures good stability and fast transient response Due to the nature of the buck converter the output L C filter must be selected to work with internal compensation For NCP1529 the internal compensation is internally fixed and it is optimized for an output filter of L 2 2 uH and COUT 10 uF The corner frequency is given by pee ee 2n LX Cour 20 2 2 uH x 10 uF eq 1 The device operates with inductance value of 2 2 uH If
7. flowing e Keep the same ground reference for input and output capacitors to minimize the loop formed by high current path from the battery to the ground plane e Isolate feedback pin from the switching pin and the current loop to protect against any external parasitic signal coupling Add a feed forward capacitor between Vout and FB which adds a zero to the loop and GND Plane Figure 7 TSOP 5 Recommended Board Layout EN Trace participates to the good loop stability A 18pF capacitor is recommended to meet compensation requirements A four layer PCB with a ground plane and a power plane will help NCP1529 noise immunity and loop stability Thermal Layout Considerations High power dissipation in small package leads to thermal consideration such as e Enlarge ViN trace and added several vias connected to power plane e Connect GND pin to top plane Join top bottom and each ground plane together using several free vias In order to increase radiator size For high ambient temperature and high power dissipation requirements UDFN6 package using exposed pad connected to main radiator is recommended Refer to Notes 6 7 and 8 GND Plane Figure 8 UDFN6 Recommended Board Layout http onsemi com 9 NCP1529ASNT1GEVB NCP1529MUTBGEVB NCP1529 PCB LAYOUT OF TSOP 5 DEMO BOARD Board reference TLS P 003 A 0907 BBR VOUT VIL 2 JOLSINONOSIWSS ND CU d NCP 1579 CERIN Converter L A H
8. ill have the lowest output ripple voltage and are strongly recommended The output capacitor requires either an X7R or X5R dielectric The output ripple voltage in PWM mode is given by 4 ESR eq 4 4 X faw X Cour AV ours ATL Table 6 LIST OF OUTPUT CAPACITOR E Feed Forward Capacitor Selection The feed forward capacitor sets the feedback loop response and is critical to obtain good loop stability Given that the compensation is internally fixed an 18 pF ceramic capacitor is needed Choose a small ceramic capacitor X7R or X5R or COG dielectric 4 7 uuF NCP1529 BILL OF MATERIAL Table 7 BOM IN TSOP 5 PACKAGE U1 C1 C2 C3 R1 P2 L1 COG Lr oemoer ms o Toler Manufacturer Designator Qty Description Value ance Part Number 1 IC Converter NA NA TSOP 5 ON Semiconductor NCP1529 DC DC 1 Ceramic Capacitor 4 7 uF 6 3 V 1096 0603 TD X5R 1 Ceramic Capacitor 10 uF 6 3 V 1096 0603 TD C1608X5R04J106 X5R BE NM A C1608X5R0J475 C1608C0G1H180 K K K td Vishay Spectrol 63M T607 105 VIN VOUT 4 Connector NA NA Emerson Network 111 2223 001 Power Connectivity Solutions http onsemi com NCP1529ASNT1GEVB NCP1529MUTBGEVB Table 7 BOM IN TSOP 5 PACKAGE Toler Manufacturer Designator Qty Description Value ance Part Number ENABLE 1 3 Pin Jumper NA NA 2 54mm TYCO AMP 5 826629 0 Header Molex Waldom 90120 0160 GND1 2 Jumper for GND NA NA 10 16mm Harwin D308
9. on see design and layout consideration section Environmental conditions such as ambient temperature TA brings thermal limitation on maximum power dissipation allowed The following formula gives calculation of maximum ambient temperature allowed by the application TA MAX TJ max Roja X Pa Where Tjisthe junction temperature Py is the maximum power dissipated by the device worst case of the application and Roya is the junction to ambient thermal resistance 7 To prevent permanent thermal damages this device include a thermal shutdown which engages at 180 C typ 8 Board recommended TSOP 5 and UDFN 6 layouts are described on Layout Considerations section C C Thermal Resistance Junction to Air TSOP 5 Package Roja V V V AN AN C C oo ELECTRICAL CHARACTERISTICS For Electrical Characteristic please report to our NCP1529 datasheet available on our website http onsemi com http onsemi com 2 NCP1529ASNT1GEVB NCP1529MUTBGEVB Table 2 NCP1529 BOARD CONNECTIONS Symbol Switch Descriptions INPUT POWER This is the positive connection for power supply This is the return connection for the power supply GND1 GND2 Ground clip SETUP ENABLE To enable the buck converter connect a shorting jumper between ENABLE 1 and ENABLE 2 To disable the buck converter connect a shorting jumper between ENABLE 3 and ENABLE 2 SELECT A shorting jumper must be used to select an output voltage of 1 2V o
10. out further notice to any products herein SCILLC makes no warranty representation or guarantee regarding the suitability of its products for any particular purpose nor does SCILLC assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation special consequential or incidental damages Typical parameters which may be provided in SCILLC data sheets and or specifications can and do vary in different applications and actual performance may vary over time All operating parameters including Typicals must be validated for each customer application by customer s technical experts SCILLC does not convey any license under its patent rights nor the rights of others SCILLC products are not designed intended or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application Buyer shall indemnify and hold SCILLC and its officers employees subsidiaries affiliates and distributors harmless against all claims costs damages and expenses and reasonable attorney fees arising out of directly or indirectly any claim of personal injury or
11. r an adjustable output voltage UDFN package OUTPUT POWER TEST POINT TPSW This is the test point of the inductor voltage TPVOUT This is the test point of the output voltage http onsemi com 3 NCP1529ASNT1GEVB NCP1529MUTBGEVB NCP1529 BOARD SCHEMATIC NCP1529 NCP1529 Figure 3 Board Schematic in TSOP 5 ENABLE S1 FB EN GND2 JMP Figure 4 Board Schematic in UDFN6 http onsemi com 4 NCP1529ASNT1GEVB NCP1529MUTBGEVB NCP1529 TEST PROCEDURE Equipment Needed Power supply Digital Volt Meter Digital Amp Meter Test 1 Jumper ENABLE and SELECT for the UDFN6 package should be open 2 Set the power supply to 3 6 V and the current limit of at least 1 5 A Un Connect Vin to power supply and Vin to ground The DC current measurement on Vin line should be around 0 3 uA For the UDFN6 package close the SELECT connector to the potentiometer Close EN connector Modify P2 potentiometer to get Vout to 1 2 V Output voltage value is defined by Vout 2 0 6 x 1 R1 R2 The DC current measurement on Vin line should be around 36 uA The part operates in PFM mode Figure 5 Vsw and Vout in PEM Mode http onsemi com 5 NCP1529ASNT1GEVB NCP1529MUTBGEVB 8 Increase Output current to 1 A The part works in PWM mode with a low ripple Figure 6 Vsw and Vout in PWM Mode 9 Remove J5 connector The DC current measurement on Vp line shoul
12. the corner frequency is moved it is recommended to check the loop stability depending of the accepted output ripple voltage and the required output current Take care to check the loop stability The phase margin is usually higher than 45 Table 4 L C FILTER EXAMPLE Inductance L Output Capacitor Cour 2 2 uH 10 uF 4 7 uH 4 7 uF http onsemi com 6 NCP1529ASNT1GEVB NCP1529MUTBGEVB Inductor Selection The inductor parameters directly related to device performances are saturation current and DC resistance and inductance value The inductor ripple current Al decreases with higher inductance V V Al REL 2 eq 2 L X fsw ViN e Alr Peak to peak inductor ripple current e L Inductor value fsw Switching frequency The saturation current of the inductor should be rated higher than the maximum load current plus half the ripple current loma hed ES eq 3 I max B l max Maximum inductor current lo maxy Maximum Output current The inductor s resistance will factor into the overall efficiency of the converter For best performances the DC resistance should be less than 0 3 Q for good efficiency Table 5 LIST OF INDUCTOR TDK VLF3010AT Series TFC252005 Series Taiyo Yuden LQ CBL2012 Coil Craft DO1605 T Series LPS3008 Output Capacitor Selection Selecting the proper output capacitor is based on the desired output ripple voltage Ceramic capacitors with low ESR values w
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