STEVAL-ISA172V2 2 kW fully digital AC-DC power supply (D-SMPS) evaluation board Data brief Synchronous rectification based on STripFET Power MOSFETs Active clamp circuit based on MDmesh DM2 Power MOSFETs EMC filter for noise reduction RoHS compliant Description The STEVAL-ISA172V2 is a 2 kW fully digital switch mode AC-DC converter consisting of two power sections: a two phase interleaved power factor corrector (PFC) and a DC-DC phaseshifted full-bridge converter, controlled by a STM32F334 microcontroller for each section. Features Input AC voltage: 90 V to 264 V Output voltage: 48 V or 52 V, Max output current: 42 A Input AC frequency: 45 Hz to 65 Hz Nominal output power: 2 kW Interleaved PFC stage PFC switching frequency: 60 kHz PFC Average current mode control Cycle by cycle PFC current control Maximum power factor: 0.99 DC-DC stage: full-bridge phase-shifted ZVS with synchronous rectification DC-DC switching frequency: 100 kHz Overall efficiency: 80 PLUS Platinum level HF transformer isolation voltage: 4 kV Forced cooling with air flow speed modulation according to the output power Over-temperature protection Output short-circuit protection PFC control & DC-DC control: managed by STM32F334C8 PFC power stage based on MDmesh M2 Power MOSFETs and SiC Diodes DC-DC power stage based on MDmesh DM2 Power MOSFETs June 2016 The interleaved PFC comprises two boost converters operating with 180 out of phase, based on 600 V MDmesh M2 Power MOSFETs. The downstream section comprises of a DC-DC phase-shifted full-bridge converter based on MDmesh DM2 Power MOSFETs and performing voltage step down using HF transformer, with a primary to secondary ratio chosen to maintain high enough efficiency and regulation over the entire operating range. On the primary side the transformer is supplied by the full-bridge converter and switching losses are reduced thanks to zero voltage switching (ZVS) operation. On the secondary side synchronous rectification (SR) is used to ensure low conduction losses. The output voltage waveform is rectified by STripFET Power MOSFETs and then smoothed by the output filter. DocID029425 Rev 2 For further information contact your local STMicroelectronics sales office 1/11 www.st.com Additional information 1 STEVAL-ISA172V2 Additional information The combination of the design choices results in boosted efficiency, in line with standard requirements in the power supply industry. The system is controlled by two STM32F334 microcontrollers, one for each section. This microcontroller adds innovative features such as a high-resolution timer, which gives increased accuracy in terms of current regulation on the primary PFC and on the secondary DC-DC phase-shifted full-bridge side. The two microcontrollers exchange information about the status of the input and output power stage via bidirectional serial communication. Both the power stage and control stage are supplied by an off-line flyback circuit based on the VIPer27H, which provides a suitable regulated voltage to the microcontrollers, as well as the gate driver ICs and the signal conditioning circuits. 2/11 DocID029425 Rev 2 DocID029425 Rev 2 Out 5k N.A. C142 GND1 R26 In- In+ 2 GND1 3 1 Vcc- GND1 C23 N. A. 3 470k U18 GND1 Vcc+ BAR43S C22 N.A. 5 1nF 300VDC (Y1) N.A. 470k 470k U4 TSV611ILT 4 GND1 1K R25 C21 1uF 1 L13 33nF C123 VAC SENSE C121 10nF 4 3 1 C122 10nF TP53 1uF 250V C126 Vin_N 4 0 - 0 C16 470nF 0 CP5 CP2 CP3 CP4 CP6 1 + GND1 CP10 CP9 CP8 CP7 Clips Clips Clips 0 C18 470nF VIN_PFC SHI1 Shield EMI Suppressor C17 470nF Q15 2STR1230 Clips Clips Clips Clips Clips Clips 3 C24 R24 R21 C20 100nF 470nF C120 2 D7 40A/600V 1 470k C15 10nF C19 100pF +3.3 pri TP22 10nF t 1 470k R23 R20 4 3 R13 10R 1 1 R22 470k R17 L2 R18 10k 10k 1 2 1 GND1 C14 220nF Vin_P 14 R16 470k R15 470k R14 470k C13 11 1 Vin_N R19 MOV1 25A/600V F1 2 1 Vin_P 1 3 2 47 R12 RELAY CONTROL 10 R11 2 VIN J1 RL1 STPS1L30 D6 3 1 2 VCC pri STEVAL-ISA172V2 Schematic diagrams Schematic diagrams Figure 1: STEVAL-ISA172V2 circuit schematic: Input section and EMI filter 1 1 1 1 1 A2 A1 2 GSPG1006150955SG 3/11 DocID029425 Rev 2 In- GND1 In+ 470 4 C43 470p Vcc+ 100 GND1 Vcc- R57 GND1 C34 470p 3 GND1 R51 27k D17 MMSZ4705 R205 4 C143 GND1 +3.3 pri 100pF 27k R58 C35 100nF U5 TSV911ILT GATE Q10 10 R59 1 C42 470p PFC_I_AVG Q9A STW48N60M2-4 / STW48N60M2 0R Remove Resistor in case of four lea d Mosf e t R197 10K SOURCE Q9 1 R56 C36 100pF 470 R50 1 STPS1L30 D13 1 1.5K R201 PFC_Ipk_1 2 R199 10K PWM Q10 PWM Q9 33 R45 2.7 N.A. R41 1 4 R53 R204 0R 330 100k R54 ENABLEQ9 330 2 1 3 5 4 GATE Q10 3 3 1 1 R31 200 R55 100k C38 100p 2 C39 100p 1 STPS1L30 D15 C29 100pF R200 10K C40 100p C41 100p PFC_Ipk_2 R207 0 N.A. 0R 1 GND1 + PM8834 R209 1R C37 1uF 10k R47 R191 470K1W R190 470K1W R189 470K1W GND_PFC SOURCE Q10 SOURCE Q9 8 7 6 5 C25 470u ENABLE_1 ENABLE_2 PWM_1 OUT_1 GND VCC PWM_2 OUT_2 IC5 R208 1R 1 2 3 4 10k R48 Q10A STW48N60M2-4 / STW48N60M2 D19 MMSZ4705 R203 4 1 1.5K R202 0R R32 RemoveResistorin caseof fourlead Mosfet SOURCE Q10 33 R46 2.7 N.A. R42 D11 SPS1H100 4.7K R35 STPSC1006D D9 STPSC1006D D8 Q10 STW48N60M2-4 / STW48N60M2 ENABLEQ10 R52 T3 CURR_TRANS 11 10 9 8 12 J16 Power_Jump RemoveResistorin caseof fourlead Mosfet D18 MMSZ4705 STPS1L30 D14 1 0R Remove Resistor in case of four lea d Mosf et 33 R44 2.7 N.A. 2 100pF C30 0R R30 2 3 R206 Q9 STW48N60M2-4 / STW48N60M2 GATE Q9 R40 R29 D10 200 SPS1H100 4.7K R34 2 100 2 1 3 5 4 2 3 1 R49 T2 CURR_TRANS 11 10 9 8 12 J15 Power_Jump 1 D16 MMSZ4705 4 2 3 2 3 2 0 1 STPS1L30 D12 R198 10K 2 140uH 140uH 1 33 R43 2.7 N.A. R39 L4 4 1 L3 4 1 2 3 RSENSE1 2mOhm 1 2 GATE Q9 VIN_PFC 2 7 6 2 TS756 D73 1 1 2 1 2 1 1 3 2 1 2 2 1 2 1 4/11 7 6 1 C26 470u GND1 + 1 GND1 GATE Q10 GATE Q9 + + VCCpri C27 470u R37 3.6K C28 470u GND1 R38 Not Assembly 100 R36 R33 180K R28 180K R27 180K GND1 400VDC t TP54 1 Heatsink 2 HT2 1 100pF C33 PFC_VBUS_SENSE GND_PFC VBUS 0R R185 Schematic diagrams Figure 2: STEVAL-ISA172V2 circuit schematic: Interleaved PFC STEVAL-ISA172V2 2 Out 5 4 3 GSPG0806161040SG GND1 1 2 CON2 J2 C48 470n C49 10n 1 1 2 8 6 SOURCE Q2 3.3 R82 3.3 2 3.3 D24 Bar46 R75 3.3 R73 R79 SOURCE Q1 GATE Q1 3 TX3 7 n 1:70 GATE Q2 4 3 5 7 8 1 1 1 4 TP37 1 1 1 1 TP39 1 1 1 TP47 R77 10k D33 MMSZ4705 D30 Bar46 1 TP46 1 D28 STPS1L30 D26 MMSZ4705 1 STPS1L30 TP38 1 2 D21 2 3 R85 10k 3 5 1 1 TP48 SOURCE Q4 GATE Q4 SOURCE Q3 C114 33n GND1 Q2 STW35N60DM2 2 5 Q1 2 STW35N60DM2 GATE Q3 R72 18 2 C47 470pF 3.3 R83 3.3 R80 D27 MMSZ4705 3.3 R76 3.3 1 1 1 TP42 1 1 1 1 TP44 R78 10k D34 MMSZ4705 D31 Bar46 1 D29 TP43 STPS1L30 2 1 D25 Bar46 TP41 1 1 D22 STPS1L30 R74 2 1 0R R86 10k TP40 1 1 TP45 L6 30uH D32 GATE Q1 STTH12R06G GATE Q4 SOURCE Q4 SOURCE Q3 GATE Q3 GATE Q2 SOURCE Q2 SOURCE Q1 Q4 STW35N60DM2 5 3 D23 6 4 3 1 Ls2 Ls1 Ls2 Ls1 2 4 3 6 5 4 3 6 5 TP40001 2 2 Lp 1 TX2 2 Lp 1 TX1 Earth Earth R92 10k Q11 VCC sec 33 GND2 VCC sec C62 100nF 100V PWM 2 CLAM P GND2 PWM 1 CLAM P 330 PWM Q13/Q14 R118 330 2 2 1 R174 100 100 R184 3 R93 10k C57 C101 R175 100k R176 100k 10k R165 C55 56p C102 PM8834 C67 100p C111 470nF 2 1 3 R119 100k D70 TZMC16-GS08 L12 L11 PulseTransformer 4 3 3 0.47uF C109 0.47uF D69 TZMC16-GS08 R172 4R7 1 2 R170 4R7 8.2 FAN F3 FAN F2 C56 56p SR2 Vsense C116 1uF 1 2 L10 220uH 1 2 2 1 2 1 1 STPS340U D72 1 STPS340U D68 1 GATE Q14 GATE Q13 R167 2.2 1/2W 2 2 R108 0 (n.c.) GND2 1uF C117 R173 2.2 1/2W 1 2 1 Source_Q 11/Q12 R210 0.1 Source_Q13/Q14 R211 0.1 4 3 C50 470u GATE CLAM P1 SOURCE CLAM P1 R117 8.2 R115 R97 6.04K 1k R88 360k R90 R120 100k C108 PulseTransformer C68 100p GATE Q12 8.2 8.2 R114 PWM Q4 PWM Q2 GATE Q11 VCC sec R111 100k 330 R107 R103 100k 330 R101 Q14 LT 40063 15uH 50 A L5 M2 C106 3.3uF 250V 2 STP24N60DM2 R96 10k GATE Q14 D42 MMSZ4705 D38 Bar46 STTH16L06C D64 R112 C64 100p PWM Q3 C60 100p PWM Q1 Q13 ENABLE Clamp R110 100k 330 R106 R102 100k 330 R100 GATE Q13 8 ENB2 7 OUT1 6 VCC 5 OUT2 GND2 C63 100p 1 2 ENB1 3 PWM1 4 GND PWM2 IC4 100p D41 MMSZ4705 R95 10k Source_Q13/Q14 C59 100p GND2 VCC sec ENABLE SR 10k R104 10k R98 GND2 C66 1uF 8 ENB2 7 OUT1 6 VCC 5 OUT2 PM8834 1 ENB1 2 PWM1 3 GND 4 PWM2 IC2 PM8834 1 2 L9 220uH SR1 Vsense 3 D37 Bar46 GATE CLAM P2 SOURCE CLAM P2 GND2 R94 6.04K 1k R87 360k R89 1 ENB1 2 PWM1 3 GND 4 PWM2 IC1 Q12 GND2 PM8834 1 2 ENB1 3 PWM1 4 GND PWM2 IC3 100p 1uF C65 8 7 ENB2 6 OUT1 5 VCC OUT2 M1 3.3uF 250V C105 2 STP24N60DM2 C100 ENB2 OUT1 VCC OUT2 100p 1uF C61 8 7 6 5 100p GATE Q12 D40 MMSZ4705 D36 Bar46 STTH16L06C D63 0R GND2 R171 10k R113 33 R105 Enable_fullBridge C58 100nF 100V R99 Enable_fullBridge GATE Q11 Source_Q 11/Q12 D39 MMSZ4705 D35 Bar46 7 11 9 10 8 12 PWM Q 11/Q12 R116 T4 TP55 1 Earth 1 t 2 1 Heatsink1 ISOLATION BARRIER STTH12R06G J11 For Current probe sensing 2 1 GND1 15n C115 Q3 STW35N60DM2 5 1 1 R71 200 2 3 2 1 VBUS 2 1 2 1 4 4 2 3 2 1 2 1 1 2 4 4 2 3 5 2 1 3 1 3 0.47uF STU2N62K3 M4 R178 10K 1/2W R177 2.2 1/2W C110 STU2N62K3 M3 R169 10K 1/2W 0.47uF R168 2.2 1/2W C107 ENABLEFAN 1uF 2A F5 gate CLAM P1 Source CLAM P2 D71 TZMC16-GS08 gate CLAM P2 Source CLAM P1 D43 J12 GND2 Q16 Jump SPS1H100 1 2 R91 22k 1k R84 R81 360k GND2 C131 470u STD12NF06 LT4 48V sec 1uF C130 STTH16L06C R195 GND2 10K 2 C129 470u 3 D67 TZMC16-GS08 51 R109 D75 SPS1H100 C53 470u 1uF C128 GND2 STTH16L06C D66 C119 C52 470u 3K9uH L14 C51 470u 1uF C118 D65 1 HT1 2 BRIDGE CURREN T SENSE 1 2 3 1 2 1 2 1 1 R70 1 2 2 1 2 1 2 1 D20 LL124148 1 2 1 2 2 1 2 21 3 2 2 1 3 3 2 1 2 2 1 2 1 DocID029425 Rev 2 1 1 2 CON2 J4 C54 56p - + C124 J3 CON2 100nF 400V C125 2 1 4 3 100nF 400V external supply voltage Remove J12 before apply External fan supply voltage R186 10k VOUT sense 48V sec 0k R188 STEVAL-ISA172V2 Figure 3: STEVAL-ISA172V2 circuit schematic: Phase shift DC-DC converter Schematic diagrams GSPG0906160910SG 5/11 Ferrite Bead C74 1F DocID029425 Rev 2 100nF 1 1 C82 TP8 1 47pF PFC_Current CT1 1 D80 BAT754 0 0 R126 C81 PFC_Ipk_2 1 2.2nF PFC_VAC 330 R137 C83 TP32 TP2 TP1 TP9 47pF PFC_Current CT2 1 TP33 TP34 PFC_USART1_TX D52 BAT754 ENABLE Q10 PWM Q10 ENABLE Q9 PWM Q9 1 1 TP7 15V 10k R138 PFC_Current R-shunt 2.2nF N.A. C80 D50 BAT754 VCC pri D79 BAT754 0R R135 +3.3 pri PFC USART1_TX PFC USART1_RX RELAY CONTROL PFC_USART1_RX PFC_I_AVG +3.3 pri J7 Ground 1 1 1 2 3 4 1 330 R136 D51 BAT754 +3.3 pri 1 1 PFC_Ipk_1 1 100nF C79 R134 D49 BAT754 TP6 VAC SENSE +3.3 pri 1 100R 1 PFC_Vbus 1 TP23 1 TP24 TP5 1 1 V_pri_Viper STM32F334C8T6 (LQFP48) PFC_Current R-shunt 1 C76 100nF J6 GND CON 1 2 3 4 36 35 100nF 34 33 COMP2-Out 32 R131 470 31 HRTIM_CHB1 R127 0 30 R130 470 29 HRTIM_CHA1 R128 0 28 R129 620R 27 D47 Blue LED 26 25 PFC_Current CT2 +3.3 pri VDD_3 VSS_3 PA13 PA12 PA11 PA10 PA9 PA8 PB15 PB14 PB13 PB12 1 1 R133 D48 +3.3 pri VBAT PC13/TAMP/RTC PC14 PC15 PF0/OSC-IN PF1/OSC-OUT NRST VSSA VDDA PA0-WKUP PA1 PA2 +3.3 pri C71 1 +3.3 pri 1 BAT754 100nF C78 1 1 PFC_VBUS_SENSE 470R 1 VO PFC Temperature 1 GND R132 TP25TP31 10k 24 23 22 21 20 PFC Temperature COMP4-Out 19 18 PFC_Current CT1 17 PFC_Current CT2 16 PFC_Vbus 15 DAC_OUT2 14 DAC_OUT1 13 +VS 2 TP4 R123 1 1 TP3 2 VDD_2 VSS_2 PB11 PB10 PB2 PB1 PB0 PA7 PA6 PA5 PA4 PA3 1 C77 LM19CIZ +3.3 pri U9 100nF 1 R122 4.7k 1 U10 C72 1 1 2 3 8MHz HC49/US 4 5 6 1 2 7 8 C73 10nF 9 PFC_Current R-shunt 10 PFC_Current CT1 11 PFC_VAC 12 1 +3.3 pri C69 R121 4.7k +3.3 pri 1 1 1 C75 100nF 1 X1 22pF C70 22pF Green LED D46 J5 PMBUS-I2C 1 +3.3 pri + 620 R124 1 +3.3 pri PA14 PA15 PB3 PB4 PB5 PB6 PB7 BOOT0 PB8 PB9 VSS_1 VDD_1 1 L7 +3.3 pri +3.3 pri GND_SIGNAL_1 +3.3 pri 1 1 1 1 1 6/11 3 2 1 37 38 39 40 1 1 41 PFC_USART1_TX 42 PFC_USART1_RX 43 44 45 46 1 47 48 1 1 1 R139 2k V_pri_Viper 1 100nF C84 D53 BAT754 +3.3 pri TP10 1 1 Schematic diagrams Figure 4: STEVAL-ISA172V2 circuit schematic: Primary MCU STEVAL-ISA172V2 1 1 3 GSPG2710151630SG 2 DocID029425 Rev 2 3 SR2 Vsense 0 C98 R160 1 2 47pF 2 TP18 DCDC_Iin 2 TP14 TP13 4k3 R161 TP15 TP16 DCDC_VDS_SR2 12V VCC sec DCDCPWM_SR2 DCDCPWM_SR1 R180 360 N.A. D59 BAT754 100nF +3.3 sec C96 D57 BAT754 +3.3 sec TP20 13k R158 U14 BAR43S +3.3 sec 2 2 2 2 +3.3 sec DCDC_VDS_SR1 BRIDGE CURRENT SENSE Enable_fullBridge 1 2 1 U13 BAR43S R179 360 N.A. D58 BAT754 2 1 47pF TP19 DCDC_Vout 100nF C95 1 TP27 470 ENABLE Clamp 1 C97 TEST POINT 100R R157 TP17 1 1 +3.3 sec VOUT sense D56 BAT754 +3.3 sec 1 D55 Blue LED DCDCPWM_LS2 DCDCPWM_HS2 DCDCPWM_LS1 DCDCPWM_HS1 R162 1k V_sec_Viper 2 100nF C99 D60 BAT754 +3.3 sec PWM Q13/Q14 PWM Q11/Q12 PWM Q4 PWM Q3 PWM Q2 PWM Q1 DCDCUSART1_TX DCDCUSART1_RX TP11 TP12 1 0 R159 2 100nF C94 DCDCTemperature R154 470 R145 620 PWM 2 CLAMP PWM 1 CLAMP 1 TP21 1 SR1 Vsense 100nF C93 2 2 R156 470 24 23 22 21 20 19 18 17 COMP2_INP R153 0R 16 R151 0R DCDC_VDS_SR2 15 R150 0R DCDC_VDS_SR1 14 R149 0R V_sec_Viper 13 ADC1_IN4 R152 0R DCDC_Iin C92 100nF 1 TP28 1 +VS VO GND VDD_2 VSS_2 PB11 PB10 PB2 PB1 PB0 PA7 PA6 PA5 PA4 PA3 +3.3 sec STM32F334C8T6 (LQFP48) 1 DCDC_USART1_TX 1 1 R155 2 COMP2_OUT DCDCPWM_LS2 DCDC PWM_HS2 DCDC PWM_Clamp2 DCDCPWM_Clamp1 DCDCPWM_SR2 DCDC PWM_SR1 DCDCPWM_LS1 DCDCPWM_HS1 TP29 TP30 DCDC_USART1_RX Ground 2 1 1 LM19CIZ 2 C87 100nF 2 1 U12 C91 100nF VDD_3 VSS_3 PA13 PA12 PA11 PA10 PA9 PA8 PB15 PB14 PB13 PB12 2 GND CON 1 2 3 4 J10 1 1 +3.3 sec + VBAT PC13/TAMP/RTC PC14 PC15 PF0/OSC-IN PF1/OSC-OUT NRST VSSA VDDA PA0-WKUP PA1 PA2 2 +3.3 sec 36 35 34 33 32 31 30 29 28 27 26 25 R144 470 +3.3 sec 1 C90 1uF 2 22pF C88 2 ENABLE FAN ENABLE SR J9 1 L8 1 PA14 PA15 PB3 PB4 PB5 PB6 PB7 BOOT0 PB8 PB9 VSS_1 VDD_1 1 Ferrite Bead +3.3 sec 100nF U11 2 R142 10k 37 38 39 40 41 DCDC_USART1_TX 42 DCDC_USART1_RX 43 44 45 46 47 48 1 2 3 4 5 6 1 2 7 8 C89 10nF 9 DCDC_Vout R146 0R 10 DCDC_VDS_SR1 R147 0R 11 DCDC_VDS_SR2 R148 0R 12 X2 8MHz HC49/US 2 +3.3 sec C85 2 R141 4.7k 1 2 3 4 1 C86 22pF 2 Green LED D54 R140 4.7k +3.3 sec 1 GND2 R143 620 2 J8 PMBUS-I2C 1 +3.3 sec +3.3 sec GND_SIGNAL_2 +3.3 sec 2 3 2 1 1 1 +3.3 sec STEVAL-ISA172V2 Figure 5: STEVAL-ISA172V2 circuit schematic: Secondary MCU Schematic diagrams 1 1 3 1 3 1 GSPG2710151600SG 7/11 8/11 GND1 + DocID029425 Rev 2 1 GND1 1 9 8 VIPER27HD 4 7 11 GND1 C12 3.3nF FB CONTROL VDD 8.2k R9 C11 33nF SOURCE DRAIN PC817 1 47k R8 3 CONT 5 470uF 25V 6 BR OPTO1 GND2 3 C10 GND1 10 U2 GND1 C5 2.2nF C3 C2 4 0 +3.3 pri GND1 D3 STPS1L40U STTH102A D2 2 C9 100uF 20V 1 R194 1 D78 DIODE Zener 15V 1W N.A. 2 9 8 10 7 1 LD1117 3 2 1 TP52 R3 R2 3.3 C6 22uF 25V 16 15 14 13 VIN VOUT GND U3 TP49 C127 100uF 20V 1 GND1 + VCC pri STPS1150A STPS1150A D5 T1 TS2431 2 VR1 220 R4 1k R5 1uH C4 82k R7 C8 33nF 470uF L1 470uF R192 VIN VOUT GND GND2 GND2 3 2 1 + 2 C7 100uF 0 R193 TP50 TEST POINT VCC sec TEST POINT 12V TP51 GND2 LD1117 U1 5V R6 2.2K GND2 R10 2K GND2 100uF 16V 0 D74 DIODE Zener 15V 1W 1 3.3 R196 D77 1 4 3 STPS1150A D76 D4 2.2 R1 D1 6 1 GND1 C1 0.1uF PKC-136 1 STPS1150A VBUS Schematic diagrams Figure 6: STEVAL-ISA172V2 circuit schematic: Auxiliary power supply STEVAL-ISA172V2 +3.3 sec 1 3 5 1 2 12 GSPG100615 1120SG DocID029425 Rev 2 GND_SIGNAL_2 2 +3.3 sec 1 PFC USART1_TX +3.3 sec GND_SIGNAL_1 +3.3 pri +3.3 pri 2 0 4 R69 2 47 3 39 1 R67 R65 1 0 4 R64 2 47 3 39 R62 R60 1 SHIELD SHIELD PS9821 U8 PS9821 U7 5 6 1 7 R66 8 5 6 7 R61 8 820 +3.3 pri 2 820 +3.3 sec R68 C45 0 100nF R63 0 100nF C44 1 C104 15pF 2 1 C103 15pF 2 STEVAL-ISA172V2 Figure 7: STEVAL-ISA172V2 circuit schematic: Communications Schematic diagrams DC-DCUSART1_RX PFC USART1_RX DC-DCUSART1_TX GSPG1006151140SG 9/11 Revision history 3 STEVAL-ISA172V2 Revision history Table 1: Document revision history 10/11 Date Version Changes 10-Jun-2016 1 Initial release. 17-Jun-2016 2 Updated title in Figure 3: "STEVAL-ISA172V2 circuit schematic: Phase shift DC-DC converter". DocID029425 Rev 2 STEVAL-ISA172V2 IMPORTANT NOTICE - PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST's terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers' products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. (c) 2016 STMicroelectronics - All rights reserved DocID029425 Rev 2 11/11