EVAL6730

EVAL6730 L6730: 20A Demoboard Data Brief General description L6730 demoboard realizes in a four layer PCB a step-down DC/DC converter and shows the operation of the device in a general purpose application. The input voltage can range from 4.5 V to 14 V and the output voltage is at 3.3 V. The module can deliver an output current in excess of 30A. The switching frequency is set at 400 KHz (controller free-running FSW) but it can be increased up to 1 MHz. A 7 positions dip-switch allows to select the UVLO threshold (5 V or 12 V Bus), the OVP intervention mode and the sink-mode current capability. Demoboard picture January 2007 Rev 1 For further information contact your local STMicroelectronics sales office. 1/9 www.st.com Features 1 EVAL6730 Features Figure 1. Demoboard schematic VIN 3 2 1 D1 C3 C1 R2 SYNCH VCCDR BOOT GIN R3 1 2 3 EAREF 9 U1 R4 C9 5 SGND R22 TP2 C21 R23 TMASK S/O/U TP3 17 L6730 8 PGDelay S1 R5 S2 R6 16 20 11 C10 R12 10 6 7 OCL LGATE R19 COMP D2 PGND PGOOD GOUT PWRGD SS R20 C15 OSC VCCDR R17 VFB STATE R16 C12R13 C13 R15 C14 SW ON A S7 B S1-S7 C S2-S7 S4 R8 D S3-S7 S5 R9 E S4-S7 S6R10 F S5-S7 G S6-S7 H S1 R14 S7R11 2/9 C16-C19 C20 C11 S3 R7 Table 1. VOUT R21 Q4-6 4 3 1 L1 Q1-3 PHASE 13 19 C8 SYNCH R18 HGATE 2 14 VCC VCCDR 12 15 18 OCH C7 G2 TP1 VCC GNDCC C2 R1 C4-C6 G1 Demoboard part list Reference Value Manufacturer Package Supplier R1 820 Ω Neohm SMD 0603 IFARCAD R2 0Ω Neohm SMD 0603 IFARCAD R3 N.C. R4 10 Ω 1% 100 mW Neohm SMD 0603 IFARCAD R5 11 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R6 6.2 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R7 4.3 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R8 2.7 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R9 1.8 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R10 1.2 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R11 2.7 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R12 1 KΩ Neohm SMD 0603 IFARCAD R13 2.7 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD EVAL6730 Table 1. Features Demoboard part list (continued) Reference Value Manufacturer Package Supplier R14 1 KΩ 1% 100mW Neohm SMD 0603 IFARCAD R15 1 KΩ 1% 100mW Neohm SMD 0603 IFARCAD R16 4.7 KΩ 1% 100mW Neohm SMD 0603 IFARCAD R17 N.C. R18 2.2 Ω Neohm SMD 0603 IFARCAD R19 2.2 Ω Neohm SMD 0603 IFARCAD R20 10 KΩ 1% 100 mW Neohm SMD 0603 IFARCAD R21 N.C. R22 N.C. R23 0Ω Neohm SMD 0603 IFARCAD C1 220 nF Kemet SMD 0603 IFARCAD C3-C7-C9-C15-C21 100 nF Kemet SMD 0603 IFARCAD C2 1 nF. Kemet SMD 0603 IFARCAD C4-C6 100 µF 20V OSCON 20SA100M RADIAL 10X10.5 SANYO C8 4.7 µF 20V AVX SMA6032 IFARCAD C10 10 nF Kemet SMD 0603 IFARCAD C11 N.C. C12 47 nF Kemet SMD 0603 IFARCAD C13 1.5 nF Kemet SMD 0603 IFARCAD C14 4.7nF Kemet SMD 0603 IFARCAD C18-C19 330µF 6.3V POSCAP 6TPB330M SMD SANYO C20 N.C. L1 1.8 µH Panasonic SMD ST D1 1N4148 ST SOT23 IFARCAD D2 STS1L30M ST DO216AA ST Q1-Q2 STS12NH3LL ST SO8 ST Q4-Q5 STSJ100NH3LL ST SO8 ST U1 L6730 ST QFN 4x4 24L ST SWITCH DIP SWITCH 7 POS. Table 2. ST Other inductor manufacturer Manufacturer Series Inductor value (µH) Saturation current (A) WURTH ELEKTRONIC 744318180 1.8 20 SUMIDA CDEP134-2R7MC-H 2.7 15 EPCOS HPI_13 T640 1.4 22 3/9 Features EVAL6730 Table 2. Other inductor manufacturer Manufacturer Series Inductor value (µH) Saturation current (A) TDK SPM12550T-1R0M220 1 22 TOKO FDA1254 2.2 14 HCF1305-1R0 1.15 22 HC5-1R0 1.3 27 Series Capacitor value(µF) Rated voltage (V) C4532X5R1E156M 15 25 C3225X5R0J107M 100 6.3 NIPPON CHEMI-CON 25PS100MJ12 100 25 PANASONIC ECJ4YB0J107M 100 6.3 COILTRONICS Table 3. Other capacitor manufacturer Manufacturer TDK 1.1 I/O description Figure 2. ● I/O description Input (Vin-Gin): The input voltage can range from 1.8 V to 14 V. If the input voltage is between 4.5 V and 14 V it can supply also the device (through the Vcc pin) and in this case the pin 1 and 2 of the jumper G1 must be connected together. ● Output (Vout-Gout): The output voltage is fixed at 3.3 V but it can be changed by replacing the resistor R14 of the output resistor divider: R 16⎞ V O = V REF • ⎛ 1 + -------⎝ R ⎠ 14 4/9 EVAL6730 Features The over-current-protection limit is set at 15 A but it can be changed by replacing the resistors R1 and R12 (see OCL and OCH pin). ● Vcc-Gndcc: Using the input voltage to supply the controller no power is required at this input. However the controller can be supplied separately from the power stage through the Vcc input (4.514V) and, in this case, jumper G1 must be left open. ● VCCDR: An internal LDO provides the power into the device. The input of this stage is the Vcc pin and the output (5 V) is the VCCDR pin. The LDO can be bypassed, providing directly a 5 V voltage from VCCDR and Gndcc. In this case the pins 1 and 3 of the jumper G1 must be shorted. ● TP1: This pin can be used as an input or as a test point. If all the jumper G2 pins are shorted, TP1 can be used as a test point of the voltage at the EAREF pin. If the pins 2 and 3 of G2 are connected together, TP1 can be used as an input to provide an external reference for the internal error amplifier. ● TP2: This test point is connected to the Tmask pin. ● TP3: This test point is connected to the S/O/U pin. ● SYNCH: This pin is connected to the synch pin of the controller. ● PWRGD: This pin is connected to the PGOOD pin of the controller. ● DIP SWITCH Different positions of the dip switch correspond to different settings of the multifunction pin (S/O/U) (CC/O/U). Table 4. Dip switch UVLO OVP 5V Not latched 5V SINK Vsou/ VBCCDRB DIP SWITCH STATE Not 0 S7 A Not latched Yes 0.2 S1-S7 B 5V Latched Not 0.3 S2-S7 C 5V Latched Yes 0.4 S3-S7 D 12 V Not latched Not 0.5 S4-S7 E 12 V Not latched Yes 0.6 S5-S7 F 12 V Latched Not 0.7 S6-S7 G 12 V Latched Yes 1 S1 H CC 5/9 Features 1.2 EVAL6730 Efficiency The following figures show the demoboard efficiency versus load current for different values of input voltage and switching frequency: Figure 3. Demoboard efficiency - Fsw=400 KHz Fsw=400KHz Vo=3.3V EFFICIENCY 95.00% 90.00% Vin=5V 85.00% 80.00% Vin=12V 75.00% 1 3 5 7 9 11 13 15 Iout (A) Figure 4. Demoboard efficiency - Fsw=645 KHz Fsw=645KHz Vo=3.3V EFFICIENCY 95.00% 90.00% Vin=5V 85.00% 80.00% Vin=12V 75.00% 70.00% 1 3 5 7 Iout (A) 6/9 9 11 13 15 EVAL6730 Features Figure 5. Demoboard efficiency - Fsw=1 MHz Fsw=1MHz Vo=3.3V 95.00% Vin=5V EFFICIENCY 90.00% 85.00% 80.00% Vin=12V 75.00% 70.00% 65.00% 60.00% 1 3 5 7 9 11 13 15 Iout (A) Efficiency with 2xSTS12NH3LL+2XSTSJ100NH3LL 12V-->3.3V EFFICIENCY (%) Figure 6. 0.96 0.95 0.94 0.93 0.92 0.91 0.9 0.89 0.88 0.87 400KHz 700KHz 1MHz 3 5 7 9 11 13 15 17 19 OUTPUT CURRENT (A) 7/9 Pictures of demoboard EVAL6730 EVAL6730 2 Pictures of demoboard EVAL6730 Figure 7. PCB layout - top layer Figure 8. Figure 9. PCB layout - Signal-ground layer Figure 10. PCB layout - bottom layer 3 Revision history Table 5. 8/9 PCB layout - power ground layer Revision history Date Revision 03-Jan-2007 1 Changes First issue EVAL6730 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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