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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 888A-B 

36V-72VIN, ISOLATED SYNCHRONOUS FORWARD  

 

 

15

 

 

 

 

 

Ref 

Des 

Single 

Phase 

PolyPhase 

C29 

10nF 

4.7nF 

C70 

3.3nF 

15nF 

C78 

10nF 

4.7nF 

R71 

OPT 

0

Ω

 

R72 

OPT 

0

Ω

 

M

A

S

TE

R

 

R74 

OPT 

0

Ω

 

C29 

10nF 

4.7nF 

C70 

3.3nF 

15nF 

C78 

10nF 

4.7nF 

C79 

3.3nF 

open 

R41 

4.42k

Ω

 

open 

R46 

604

Ω

 

open 

R59 

OPT 

0

Ω

 

R60 

OPT 

0

Ω

 

R62 

OPT 

0

Ω

 

R63 

100k

Ω

 

open 

R64 

OPT 

0

Ω

 

R67 

OPT 

0

Ω

 

R68 

9.1k

Ω

 

open 

R69 

110k

Ω

 

open 

R70 

0

Ω

 

open 

S

LA

V

E

 

R73 

OPT 

0

Ω

 

  

Figure 18.

 

 Single Phase to PolyPhase Electrical Component Changes 

Summary of Contents for LTC3706

Page 1: ...OUT VIN 36V to 72V IOUT 0A to 40A 5V Maximum Output Current 200LFM 40A Typical Output Ripple VOUT VIN 48V IOUT 40A 250kHz 60mVP P Output Regulation Over All Input Voltages and Output Currents 1 Reference Peak Deviation with 20A to 40A Load Step 10A us 250mV Load Transient Response Settling Time 50us Nominal Switching Frequency 250kHz Efficiency VIN 36V IOUT 28A 93 5 Typical Isolation BASIC 1500VDC...

Page 2: ...posite phase via the primary side SS FLT pin inter connection or the secondary side RUN SS intercon nection Sharing Vcc on the secondary side ensures the master which initially develops this bias voltage and slave power up simultaneously Each phase then contributes to the shared Vcc bus Finally the input voltage Vin and output voltage Vout busses are interconnected to allow for load sharing OPTION...

Page 3: ...d Vin a Input voltages lower than 36V can keep the con verter from turning on due to the undervoltage lockout feature of the LTC3725 b If efficiency measurements are desired an am meter capable of measuring at least 8Adc per phase can be put in series with the input supply in order to measure the DC888A B s input cur rent c A voltmeter with a capability of measuring 72V can be placed across the in...

Page 4: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 888A B 36V 72VIN ISOLATED SYNCHRONOUS FORWARD 4 Figure1 Proper Measurement Equipment Setup VIN GND Figure2 Measuring Input or Output Ripple ...

Page 5: ...VIN ISOLATED SYNCHRONOUS FORWARD 5 MEASURED DATA Figures 3 through 14 are measured data for a typical DC888A B Figures 15 through 23 consist of schematics bill of materials and a picture Figure3 Efficiency Figure4 Output Voltage Ripple 48Vin 40A Single Phase ...

Page 6: ...ART GUIDE FOR DEMONSTRATION CIRCUIT 888A B 36V 72VIN ISOLATED SYNCHRONOUS FORWARD 6 Figure5 Load Transient Response 48Vin 20A to 40A to 20A at 10A us Single Phase Figure6 Loop Response 48Vin 4A 40A Single Phase ...

Page 7: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 888A B 36V 72VIN ISOLATED SYNCHRONOUS FORWARD 7 Figure7 Turn on 48Vin 40A Single Phase Figure8 Turn on 48Vin 80A PolyPhase ...

Page 8: ...FOR DEMONSTRATION CIRCUIT 888A B 36V 72VIN ISOLATED SYNCHRONOUS FORWARD 8 Figure9 Transient Sharing of Inductor Current 48Vin 30A to 60A PolyPhase Figure10 Transient Sharing of Inductor Current 48Vin 60A to 30A PolyPhase ...

Page 9: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 888A B 36V 72VIN ISOLATED SYNCHRONOUS FORWARD 9 Figure11 Temp Data 48Vin 40A 200LFM airflow top Figure12 Temp Data 48Vin 40A 200LFM airflow bottom ...

Page 10: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 888A B 36V 72VIN ISOLATED SYNCHRONOUS FORWARD 10 Figure13 Temp Data 48Vin 36A 0LFM airflow top Figure14 Temp Data 48Vin 36A 0LFM airflow bottom ...

Page 11: ... IHLP2525CZERR68M01 T2 Pulse PA1954NL D29 BAS21 Q14 C30 2 2nF 250V IS C2 2 2uF 100V A R51 6 8 1 4W C79 3 3n R69 110K C51 2 2n 100V VOUT T3 CT02 100 1 2 3 4 R68 9 1K SG VCC C55 1nF C3 C5 3 X 2 2uF 100V C24 1uF T4 R46 604 C27 100pF R18 365K R79 68K Q25 FMMT718 VOUT C78 10nF Q30 2N7002 3 R75 510 Q27 FCX491A SG R78 750 Si7336ADP C86 68pF VOUT Q8 Si7450DP Q15 Q11 Si7336ADP R80 100K Q29 Si2303BDS R101 1...

Page 12: ...VOUT Q24 4 5 2 3 6 7 8 1 1 0K Q8 C75 9 1K VERSION TABLE 3 3nF C72 0 1uF 36V 72Vin SSS 1 5nF 330 VERSION Si7336ADP Q30 2N7002 1 2 3 R71 OPT C33 VCC C31 R63 100K B R82 150 R29 100K Q13 4 5 2 3 6 7 8 1 opt 10nF Q23 4 5 2 3 6 7 8 1 R108 C86 68pF R46 604 P1 10 10 SYNC 3 C66 390 12V 20A D26 CMPSH1 4 R73 OPT C79 C77 2 2uF opt R84 R78 D FOR POLYPHASE J1 5 5 R69 110K VOUT LTC3706EGN U2 7 2 20 6 12 16 15 1 ...

Page 13: ... 25V 10 0603 AVX 06033A680KAT2A 1 C100 CAP C0G 150pF 25V 10 0603 AVX 06033A151KAT2A 1 C101 CAP C0G 470pF 25V 10 0603 AVX 06033A471KAT2A 4 D1 D2 D24 D26 Diode Schottky CMPSH1 4 40V SOT23 CENTRAL SEMI CMPSH1 4 LTC 2 D27 D29 Diode BAS21 SOT23 Diodes Inc BAS21 1 L1 INDUCTOR 100uH DO1606T Coilcraft DO1606T 104MLC 1 L6 INDUCTOR PLANAR 0 65uH PULSE PA1382 650 2 Q11 Q9 Q8 FET N CH Si7450DP Powerpak SO 8 V...

Page 14: ...SSOP 24GN LINEAR TECH LTC3706EGN PBF ADDITIONAL DEMO BOARD CIRCUIT COMPONENTS 2 1 C2 CAP X7R 2 2uF 100V 20 1210 Murata GRM32ER72A225K 0 C74 opt CAP 0603 0 C81 C82 opt CAP 0603 0 D30 opt Diode SOT23 0 D31 opt Diode SOT23 1 L5 INDUCTOR 0 68uH VISHAY IHLP 2525CZERR68M01 e3 0 Q8 opt FET N CH SO 8 2 R49 R70 RES CHIP 0 1 16W 0603 VISHAY CRCW06030000Z0EA 0 R59 R60 R62 R64 R67 R71 R74 opt RES 0603 0 R102 ...

Page 15: ...3nF 15nF C78 10nF 4 7nF R71 OPT 0Ω R72 OPT 0Ω MASTER R74 OPT 0Ω C29 10nF 4 7nF C70 3 3nF 15nF C78 10nF 4 7nF C79 3 3nF open R41 4 42kΩ open R46 604Ω open R59 OPT 0Ω R60 OPT 0Ω R62 OPT 0Ω R63 100kΩ open R64 OPT 0Ω R67 OPT 0Ω R68 9 1kΩ open R69 110kΩ open R70 0Ω open SLAVE R73 OPT 0Ω Figure18 Single Phase to PolyPhase Electrical Component Changes ...

Page 16: ...LMT IS GATE SSFLT FB IN FS IN ULVO PGND GND C51 2 2n 100V IS J1 5 5 T1 PA0954 4 4 1 1 7 2 4 11 3 8 10 5 6 1 VPKS to VPKS SLV 6 VOUT B R23 6 8 1 4W R58 5 1K C78 4 7nF R53 12 Vaux R101 100 5Vo MASTER C67 10uF 25V E4 4 J1 6 6 VOUT VOUT ITH Q29 Si2303BDS C75 100p R81 150 Q13 3 1 Vin to SLV SSS to SSS SLV C86 68pF R24 6 8 1 4W Vout VPKS C77 2 2uF VCC C72 0 1uF E2 E3 R41 4 42K D1 CMPSH1 4 Q28 FDC2512 P1...

Page 17: ...MODE PGND VIN NDRV PGOOD REGSD PHASE VS VS VSOUT C69 2 2n 100V R75 510 Si7336ADP C77 2 2uF Q29 Si2303BDS C29 4 7n R24 6 8 1 4W VPKS to VPKS SLV C C30 2 2nF 250V P1 10 10 SSS to SSS SLV VOUT VOUT to SLV C100 150pF R76 8 06 SYNC to SYNC SLV R56 100 C71 1uF E2 SG Q25 FMMT718 Vaux VOUT C85 0 1uF IS VOUT VOUT D27 BAS21 D2 CMPSH1 4 6 SW R18 365K VOUT 36V 72Vin ITH R48 15m 1 5W J1 8 8 Q27 FCX491A 1 E1 C3...

Page 18: ...72A225K L5 VISHAY IHLP2525CZERR68M01 T2 Pulse PA1954NL 47pF R78 9 1K R82 150 D26 CMPSH1 4 R56 100 J1 6 6 C3 2 2uF 100V opt VCC Q12 4 5 2 3 6 7 8 1 C81 opt R68 opt 10 R107 LTC3706EGN U2 7 2 20 6 12 16 15 1 24 22 21 14 13 8 4 23 19 18 3 17 5 10 11 9 ITH FG SW FB GND IS IS SG VCC PT PT SLP FS SYNC RUN SS MODE PGND VIN NDRV PGOOD REGSD PHASE VS VS VSOUT C51 C69 VOUT P1 11 11 E4 R62 OPT DC888A C R53 12...

Page 19: ...PSH1 4 C34 C66 opt 10nF B R80 100K R3 100 FMMT718 Q26 C33 FMMT619 Q32 8 06 VCC VOUT ITH to ITH MSTR VOUT 3 4 7nF R102 R67 0ohms C100 150pF R102 C30 2 2nF 250V LTC3725EMSE U1 3 8 9 10 7 2 4 5 1 6 11 NDRV VCC VSLMT IS GATE SSFLT FB IN FS IN ULVO PGND GND E1 opt C82 opt E2 VCC J1 5 5 J1 10 10 LTC3706EGN U2 7 2 20 6 12 16 15 1 24 22 21 14 13 8 4 23 19 18 3 17 5 10 11 9 ITH FG SW FB GND IS IS SG VCC PT...

Page 20: ...QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 888A B 36V 72VIN ISOLATED SYNCHRONOUS FORWARD 20 Figure23 Picture of two DC888A s configured for PolyPhase ...

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