demo board for SP6128A, a synchronous buck controller Non-Isolated DC-DC SIP Modules: 3.0Vdc-5.5Vdc In, 0.9Vdc-3.3Vdc out, 10A FEATURES: • High Efficiency: 94.5% at 3.3V output,10A Small size and very low profile 43.2mm × 7.25mm × 13.97mm (1.7in × 0.285in × 0.55in) 3V to 5.5V input voltage All ceramic capacitors design Negative or Positive remote On/Off Thermal shut down protection Low output ripple max 20mV Output voltage adjustable with the trim function Low EMI noise Short circuit and over current protection using Hiccup mode and auto-restart Build in UVLO function Wide operation temperature range -40 °C to +85 °C ± 0.1% line regulation & ± 0.3% load regulation -40 °C to +85 °C DESCRIPTION: The SP6128A demo board design is non-isolated dc-dc SIP module with a very high efficiency at 10A output. It has smallest size comparing with the current market products with the same power range and low EMI. Standard features include remote ON/OFF with the customer selectable positive and negative control, output voltage adjustment, soft start, over current and over temperature protection. This demo board proves that SP6128A is a high performance, but yet easy to use synchronous buck controller. It simplifies low voltage DC to DC power supply designs without compromising performance. -1- APPLICATION • workstations, servers • computer and its peripheral • distribution power architecture • • telecommunications equipment data processing and storage equipment • LANs and WANs • high performance data processing IC SCHEMATIC: PCB Layout: 2 Top Layer Internal-1 layer Internal-2 layer Bottom Layer 3 SST SSB CHARACTERISTIC CURVE (1.8V output) SP6128A EVAL Board regulation 95 1.816 94 1.814 93 1.812 Output(V) EFF (%) SP6128A EVAL Board Eff 92 91 3.3V 90 5V 89 1.81 1.808 1.806 3.3V 1.804 5V 1.802 88 0 1 2 3 4 5 6 7 8 9 0 10 1 Load (A) Figure 1 2 3 4 5 6 Load(A) Figure 2 Figure 3: input ripple @ Vin=3.3V, Io=10A Figure 4: input ripple @ Vin=5V, Io=10A 4 7 8 9 10 Figure 5:output ripple @ Vin=3.3V Io=10A Figure 6:output ripple @ Vin=5V Io=10A Figure 8 startup, Ch1:Vin, Ch2:Vout, Ch3:Iin 2A/div @Io=10A Figure 7: startup, Ch1:Vin, Ch2:Vout, Ch3:Iin 2A/div @Io=10A Figure 10: output short, Ch2: COM Ch4:Iin 5A/div@Vin=5.0V Figure 9: output short, Ch2: COM Ch4:Iin 5A/div@Vin=3.0V 5 Figure11: transient response, Ch1:Vout Ch2:Iout 2A/div load change At 5A/us from 0.4A to 5A @ Vin=3.3V Figure12: transient response, Ch1:Vout Ch2:Iout 2A/div load change At 5A/us from 0.4A to 5A @ Vin=5V Figure13: short circuit Iin RMS value Ch2: Vin, Ch4 Iin 2A/div Figure14: short circuit Iin RMS value Ch2: Vin, Ch4 Iin 2A/div *short circuit protection tested at with Cin=100uF, Tantalum 6 ELECTRICAL SPECIFICATIONS Parameter Operating input voltage Input voltage ripple Output voltage set point accurate Output regulation Line regulation Load regulation Output ripple&noise Output current Output current limit point Over temperature protection Negative remote control: Logic low-module on Logic high-module off Positive remote control: Logic high-module on Logic low-module off Symbol Min Vin Vinripple 2.9 Typ Max Units 250 6 300 ± 1.5 Vdc mVp-p % ± 0.1 ± 0.3 % % mVp-p A A 15 Io 110 Vrem Irem Vrem Irem Vrem Irem Vrem Irem Turn-on time Short circuit input current(RMS) Output voltage trim range -0.7 25 10 16 120 0.3 100 2.4 0.5 °C V µA 1 0.8 1 5 0.5 V mA V mA V µA ms A +10 % Vout ,nom 2.4 -0.7 -10 FEATURE DISCRIPTION Output voltage trim function: In this design,there is a trim pin that allows the customer to trim the output voltage to ± 10% off the nominal voltage. In the schematic on page 2, R3, R14, R2 and external trim resistor (Rtrim) comprise the trim function circuit. To trim-up, connect Rtrim between trim pin and GND. The Rtrim value is equal to: Rtrim= 0 .8 × R 2 − R14 ∆V To trim-down, connect Rtrim between trim pin and Vout. The Rtrim value can be derived from: 2 Rtrim= 0.8 × R2 − R2 − R14 R3 × ∆V Remote On/OFF: 7 This design allows user to select positive or negative logic remote control. This demo board only implements the negative logic remote control circuit. To change to positive logic, remove Q5, R7, R8, and R12.and add D2 andD3. Over temperature protection: The over temperature protection will shut down the module when abnormal high temperature is detected by the circuit.. The module will attempt to restart once the temperature cools down. The temperature set point can be adjusted by resistor R11. Mechanical Outline Diagram Dimensions are in millimeter (inch) 43.2(1.7) 7.25(0.285) 13.95(5.5) 1 2 3 4 5 6 7 8 9 IN 1 2 3 4 5 6 7 8 9 *the pin out is not the same as standard BILL MATERIAL 8 FUNCTION Vo Vo GND GND GND ON/OFF Trim Vi Vi Item Quantity Reference Part Manufacture information 1 2 C1,C2 22u TDK C3225X5R1A226M 2 3 C3,C8,C13 1u TDK C2012X7R1C105K 3 3 C4,C5,C6 47u TDK C3225X5R0J476M 4 1 C9 470p TDK C1608C0G1H471J 5 1 C10 22p TDK C1608C0G1H220J 6 2 C11,C12 0.1u TDK C1608X7R1H104K 7 1 C14 6.8n TDK C1608X7R1H682K 8 1 D1 MBR0530 ON semiconductor 10 1 D4 STPS2L25U ST 11 12 9 J1,J2,J3,J4,J5,J6,J7 PIN ,J8,J9 1 L1 SC5018-1R2M Easy Magnetic 13 2 Q1,Q2 IRF7811W IRF 14 1 R1 300 0603 15 1 R2 10.2k 0603 16 1 R3 8k 0603 17 1 R5 20k 0603 18 1 R6 4.22k 0603 19 1 R13 0 0603 20 1 R14 45k 0603 21 1 U1 SP6128A SIPEX 22 1 R11 100 0603 23 4 R7,R8,R10,R12 10K 0603 24 2 Q3,Q4 MMBT4401 ON semiconductor 25 1 Q5 MMBT2907 ON semiconductor 22 1 R9 NTC-100K TDK NTCG204CH104J ∗ For the low profile application, SC5015-1R2M from Easy magnetic recommended for L1 9 EFFICIENCY ON THE DIFFERENT OUTPUT VOLTAGE Input voltage 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 3.0-5.5V 4.5-5.5V Output voltage 0.9V 1V 1.2V 1.5V 1.8V 2.0V 2.5V 3.3V Output current 10A 10A 10A 10A 10A 10A 10A 10A SIGNAL PROCESSING EXCELLENCE Headquarters and sales office 22 Linnell Circle Billerica,MA 01821 TEL:978-667-8700 FAX:978-670-9001 E-mail: [email protected] Sales office 233 South Hillview Drive Milpitas,CA 95035 TEL:408-934-7500 FAX:408-935-7600 Application support Jack Ni TEL:978-671-4644 Email: [email protected] 10 Efficiency 82% 84% 86% 88% 90.5% 90.5% 92.7% 94.5% Internal Trim resistor 80.6K 40.2K 20.5K 11.8K 8.06K 6.81K 4.75K 3.24K