JW5018B

EV5018B_S0_R0 600mA, 40V Synchronous Step-Down Converter Evaluation Board Parameters Subject to Change Without Notice FEATURES









4.7V to 40V operating input range 600mA output current Up to 93% efficiency High efficiency (>78%) at light load Internal Soft-Start 800kHz switching frequency Input under voltage lockout Available in SOT23-6 package Current run-away protection Short circuit protection Thermal protection APPLICATIONS




DESCRIPTION Distributed Power Systems Automotive Systems High Voltage Power Conversion Industrial Power Systems Battery Powered Systems The JW5018B is a current mode monolithic buck switching regulator. Operating with an input range of 4.7V~40V, the JW5018B delivers 600mA of continuous output current with two integrated N-Channel MOSFETs. The internal synchronous power switches provide high efficiency without the use of an external Schottky diode. At light loads, the regulator operates in low frequency to maintain high efficiency and low output ripple. Current mode control provides tight load transient response and cycle-by-cycle current limit. The JW5018B guarantees robustness with short-circuit protection, thermal protection, current run-away protection, and input under voltage lockout. ELECTRICAL SPECIFICATIONS Parameter Symbol Value Unit Input Voltage VIN 7.5~40 V Output Voltage VOUT 5 V Output Current IOUT 0~0.6 A EVALUATION BOARD AND TYPICAL PERFORMANCE Efficiency @ Vout=5V 100.00% 95.00% 90.00% EFFICIENCY 85.00% 80.00% 75.00% 70.00% Vin=8V 65.00% Vin=12V 60.00% Vin=24V 55.00% Vin=36V 50.00% 0 100 200 300 400 500 600 700 OUTPUT CURRENT(mA) EV5018B_S0_R0 Rev.0.8 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 1 EV5018B_S0_R0 JoulWatt SCHEMATIC BILL OF MATERIALS Qty. Designator Value 1 C0 47uF 1 C1 100nF 1 1 C2 4.7uF Description Electrolytic capacitor 50V Ceramic capacitor 50V ,X7R Ceramic capacitor 50V ,X7R Ceramic capacitor Package Manufacturer Manufacturer P/N RB.1/.2 0603C CL10B104KO8N SAMSUNG 1206C NNC CL31B475KBHN SAMSUNG NNE C3 10uF 0 C4 NC 1 L1 10uH/3.2A Inductor 7332 WE 1 R1 100k Resistor,5% 0603R Uniohm 0603J0104T5E 1 R2 100k Resistor,5% 0603R Uniohm 0603J0104T5E 1 R3 11.2k Resistor,1% 0603R Uniohm 0603F1122T5E 1 R4 2.1k Resistor,1% 0603R Uniohm 0603F2101T5E 1 R5 0Ω Resistor,5% 0603R Uniohm 0603J0000T5E EV5018B_S0_R0 Rev.0.8 16V ,X7R 1210C JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2 EV5018B_S0_R0 JoulWatt Qty Designator Value 1 VIN 7.5V~40V TEST-Pole 1 VOUT 5V/600mA TEST-Pole 1 JW5018B 40V/600mA EV5018B_S0_R0 Rev.0.8 Description Buck Package SOT23-6 Manufacturer Joulwatt JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Manufacturer P/N JW5018B 3 EV5018B_S0_R0 JoulWatt PRINTED CIRCUIT BOARD LAYEROUT Figure1— —Top Layer Figure2— —Bottom Layer Figure3— —Top Silk Layer Figure4— —Bottom Silk Layer QUICK START GUIDE 1. Connect the positive terminal and negative terminal of the load to Vout and GND of EVB, respectively. 2. Connect a power supply between VIN and GND with the supply in “OFF” state. Set the output voltage of the power supply to 7.5V~40V. 3. Turn on the power supply and the evaluation board starts operating in normal condition. 4. The output voltage can be adjusted by varying the R3 and R4 on EVB. For example： ：Fixed R4 to2.1K,when adjusting the output voltage to 5V， ， R3=Vout/0.8*R4-R4. For more information, please refer to the datasheet ofJW5018B. EV5018B_S0_R0 Rev.0.8 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 4 EV5018B_S0_R0 JoulWatt TYPICAL PERFORMANCE CHARACTERISTICS Vin = 12V, Vout = 5V, L = 10µH, Cout = 10µF, TA = +25°C, unless otherwise noted Steady State Test Startup through Enable Shutdown through Enable VIN=12V, Vout=5V Iout=600mA VIN=12V, Vout=5V Iout=600mA(Resistive load) VIN=12V, Vout=5V Iout=600mA(Resistive load) Light Load Operation Medium Load Operation Heavy Load Operation 0 A LOAD 300mA LOAD 600mA LOAD Short Circuit Protection VIN=12V, Vout=5V Iout=600mA- Short EV5018B_S0_R0 Rev.0.8 Short Circuit Recovery VIN=12V, Vout=5V Iout= Short-600mA JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. Load Transient → 600mA LOAD → 300mA LOAD 300mA LOAD 5 EV5018B_S0_R0 JoulWatt IMPORTANT NOTICE
Joulwatt Technology Inc. reserves the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein.
Any unauthorized redistribution or copy of this document for any purpose is strictly forbidden.
Joulwatt Technology Inc. does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. Copyright © 2015 EV5018B_S0_R0 Incorporated. All rights are reserved by Joulwatt Technology Inc. EV5018B_S0_R0 Rev.0.8 JoulWatt® Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 6