DN06043/D Design Note – DN06043/D USB to 6V 0.3A USB Charger Device Application Input Voltage Output Power Topology I/O Isolation NCP3063 Consumer 4.5-5.5 V 1.8W Zeta Yes Characteristic Output Voltage Output Current Oscillator Frequency Output Voltage Ripple Load Regulation (Vin = 5V, Iout = 0.0 - 0.3A) PCB Dimensions Min Typ Max Unit 6.0 V 0.3 0.7 A 250 kHz 100 mVpk-pk 0.7 % 13mm X 25mm x 0.4mm Circuit Description This circuit is design to operate as a non inverting Buck-Boost (Zeta Topology) producing a fixed voltage 6.0V output from a standard USB output. It provides a maximum of 0.3A. The current limit circuit operates at loads higher than 0.3A and is compliant with the USB 2.5W maximum power draw. All devices are less than 45degC at ambient temperature. This design utilizes the NCP3063 DFN Device with slope compensation to reduce burst mode ripple effects. Rev 0 - June, 2008 DN06043/D PCB Details Top Device Bottom Device (Viewed from Back) Top Metal Rev 0 - June, 2008 DN06043/D Bottom Metal Gerber Files available upon request Rev 0 - June, 2008 DN06043/D Schematic Rev 0 - June, 2008 DN06043/D QTY 2 1 1 2 1 1 1 2 1 1 1 1 1 1 1 1 1 1 2 1 1 1 1 1 REF C5-6 C4 C3 C1-2 D3 Q2 Q1 D1-2 T1 Q3 R11 R8 R10 R9 R5 R3 R2 R4 R6-7 R1 J2 C7 J1 U1 VALUE 0.01uF 1.0uF 6.8nF 10uF 1A; 100V PNP PNP 100Vr 47uH DESCRIPTION CAP_0603,0.01uF CAP_0603,0.1uF CAP_0603,6.8nF CAP_1206,10uF MBRM130L,1A; 100V MMBT3904,PNP MMBT3904LT1,PNP MMSD4148T1_SOD-123,100Vr,N/A MSD7333-473ML NTGS4111P 1.8K RES0603,1.8K 15K RES0603,15K 6.8K RES0603,6.8K 91K RES0603,91K 150K RES_0603,150K,±1.0% 15K RES_0603,15K,±1.0% 47K RES_0603,47K,±1.0% 681 RES_0603,680,±1.0% 0.3 RES_0805,0.3,±1.0% 681 RES_0805,680,±1.0% SIP-2P-MICRO 100uF TPSY107M006R0100,100uF NA WM17118 40 V 1.5A NCP3063BDR2G Ceramic Chip Capacitor Ceramic Chip Capacitor Ceramic Chip Capacitor Ceramic Chip Capacitor Schottky Power Rectifier General Purpose NPN Transistor General Purpose NPN Transistor Switching Diode Coupled Inductor - Coilcraft PFET SURFACE MOUNT RESISTOR 0.031 X 0.061 INCHES, 1/10W SURFACE MOUNT RESISTOR 0.031 X 0.061 INCHES, 1/10W SURFACE MOUNT RESISTOR 0.031 X 0.061 INCHES, 1/10W SURFACE MOUNT RESISTOR 0.031 X 0.061 INCHES, 1/10W Resistor Resistor Resistor Resistor Resistor Resistor GENERIC 2 PIN SIP HEADER .100 CENTERS Tantalum Capacitor Molex USB Connector 1.5 A, 150 kHz Switching Regulator Bill of Materials Rev 0 - June, 2008 DN06043/D Block Diagram - NCP3063 Rev 0 - June, 2008 DN06043/D Performance Information The following Figures show typical measured performance of the NCP3063 in this evaluation board Efficiency vs Iout 90 80 70 60 4.5V in Efficiency 50 5.0V in Efficiency 40 5.5V in Efficiency 30 20 10 0 0 0.2 0.4 0.6 0.8 Figure 1 –Efficiency vs Load Current Pout vs Rload 3 2.5 2 Pout for 4.5V in 1.5 Pout for 5.0V in Pout for 5.5V in 1 0.5 0 100 80 60 40 20 0 Figure 2 – Output Power vs Load Resistance Rev 0 - June, 2008 DN06043/D Vout vs Iout 7 6 5 4 4.5 Vin 5.0 Vin 3 5.5 Vin 2 1 0 0 0.2 0.4 0.6 0.8 Figure 3 – Output Voltage vs Output Current 1 © 2008 ON Semiconductor. Disclaimer: ON Semiconductor is providing this design note “AS IS” and does not assume any liability arising from its use; nor does ON Semiconductor convey any license to its or any third party’s intellectual property rights. This document is provided only to assist customers in evaluation of the referenced circuit implementation and the recipient assumes all liability and risk associated with its use, including, but not limited to, compliance with all regulatory standards. ON Semiconductor may change any of its products at any time, without notice. Design note created by Tom Duffy and Tim Kaske, e-mail:[email protected] & [email protected] Rev 0 - June, 2008