Datasheet LT8228 (Analog Devices) - 10
| Manufacturer | Analog Devices |
| Description | Bidirectional Synchronous 100V Buck/Boost Controller with Reverse Supply, Reverse Current and Fault Protection |
| Pages / Page | 68 / 10 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| File Format / Size | PDF / 3.8 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. BUCK EFFICIENCY AND OPERATION. ISET1P and IMON1
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LT8228
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. BUCK EFFICIENCY AND OPERATION ISET1P and IMON1 Peak Inductor Current vs V1 BG MOSFET Short in Regulation Measurement Accuracy (Buck) (Buck)
8 60 ISET1P IMON1 SW 50 6 25V/DIV 40 IL 4 50A/DIV 30 DG2 I L,PEAK 10V/DIV ERROR (%) 2 V2 20 10V/DIV 0 10 100µs/DIV 8228 G12 –2 0 0 5 10 15 20 25 30 35 40 28 32 36 40 44 48 52 56 60 VRSNS1 (mV) V1 (V) 8228 G10 8228 G11
TG MOSFET Short in Regulation Reverse Battery Insertion at V2 Reverse Battery Insertion at V2 (Buck) (LT8228 Disabled) in Regulation
SW IL 25V/DIV V2D 20A/DIV 5V/DIV V2D DG2 I 10V/DIV L 5V/DIV 50A/DIV DG2 V2 10V/DIV DG2 5V/DIV V2 10V/DIV 10V/DIV V2 10V/DIV 100µs/DIV 8228 G13 100µs/DIV 8228 G14 100µs/DIV 8228 G15
Multiphase Operation (Buck) Multiphase Operation (Buck) Phase Turn-On Phase Turn-Off
V2 V2 5V/DIV 5V/DIV PHASE 1 IL PHASE 1 IL 10A/DIV 10A/DIV PHASE 2 IL PHASE 2 IL 10A/DIV 10A/DIV 1ms/DIV 8228 G16 100µs/DIV 8228 G17 Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Buck Efficiency and Operation Typical Performance Characteristics Boost Efficiency and Operation ENABLE, Supply Current and VCC SS Current, Frequency, Thresholds and Driver Protection MOSFET Controller Pin Functions Block Diagram Operation Overview Buck Mode Operation Boost Mode Operation V1 Protection MOSFET Controller Operation V2 Protection MOSFET Controller Operation Mode of Operation (DRXN) Enable and Soft-Start (Enable and SS) Paralleling Multiple Controllers (ISHARE AND IGND) BIAS Supply and VCC Regulators Strong Gate Drivers Frequency Selection, Spread Spectrum and Phase-Locked Loop (RT and SYNC) FAULT Monitoring and REPORT Feature Applications Information Introduction Programming the Switching Frequency Inductor Selection RSNS2 and RIN2 Selection for Peak Inductor Current RSET2P Selection for V2 Output Current Limit (Buck Mode) RSET2N Selection for V2 Input Current Limit (Boost Mode) RMON2 Selection for V2 Current Monitoring RSNS1 and RIN1 Selection RSET1P Selection for V1 Input Current Limit (Buck Mode) RSET1N Selection for V1 Output Current Limit (Boost Mode) RMON1 Selection for V1 Current Monitoring Output Voltage, Input Undervoltage and Output Overvoltage Programming Power MOSFET Selection and Efficiency Considerations Optional Schottky Diode (D2 and D3) Selection Top MOSFET Driver Supply (CBST, DBST) Power Path Capacitor Selection Loop Compensation Inrush Current Control Boost Output Short Protection and Timer FAULT Conditions Soft-Start REPORT Feature Paralleling Multiple LT8228s BIAS, DRVCC, INTVCC and Power Dissipation Thermal Shutdown Pin Clearance/Creepage Consideration Efficiency Considerations PC Board Layout Checklist Design Example Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. BUCK EFFICIENCY AND OPERATION ISET1P and IMON1 Peak Inductor Current vs V1 BG MOSFET Short in Regulation Measurement Accuracy (Buck) (Buck)
8 60 ISET1P IMON1 SW 50 6 25V/DIV 40 IL 4 50A/DIV 30 DG2 I L,PEAK 10V/DIV ERROR (%) 2 V2 20 10V/DIV 0 10 100µs/DIV 8228 G12 –2 0 0 5 10 15 20 25 30 35 40 28 32 36 40 44 48 52 56 60 VRSNS1 (mV) V1 (V) 8228 G10 8228 G11
TG MOSFET Short in Regulation Reverse Battery Insertion at V2 Reverse Battery Insertion at V2 (Buck) (LT8228 Disabled) in Regulation
SW IL 25V/DIV V2D 20A/DIV 5V/DIV V2D DG2 I 10V/DIV L 5V/DIV 50A/DIV DG2 V2 10V/DIV DG2 5V/DIV V2 10V/DIV 10V/DIV V2 10V/DIV 100µs/DIV 8228 G13 100µs/DIV 8228 G14 100µs/DIV 8228 G15
Multiphase Operation (Buck) Multiphase Operation (Buck) Phase Turn-On Phase Turn-Off
V2 V2 5V/DIV 5V/DIV PHASE 1 IL PHASE 1 IL 10A/DIV 10A/DIV PHASE 2 IL PHASE 2 IL 10A/DIV 10A/DIV 1ms/DIV 8228 G16 100µs/DIV 8228 G17 Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Buck Efficiency and Operation Typical Performance Characteristics Boost Efficiency and Operation ENABLE, Supply Current and VCC SS Current, Frequency, Thresholds and Driver Protection MOSFET Controller Pin Functions Block Diagram Operation Overview Buck Mode Operation Boost Mode Operation V1 Protection MOSFET Controller Operation V2 Protection MOSFET Controller Operation Mode of Operation (DRXN) Enable and Soft-Start (Enable and SS) Paralleling Multiple Controllers (ISHARE AND IGND) BIAS Supply and VCC Regulators Strong Gate Drivers Frequency Selection, Spread Spectrum and Phase-Locked Loop (RT and SYNC) FAULT Monitoring and REPORT Feature Applications Information Introduction Programming the Switching Frequency Inductor Selection RSNS2 and RIN2 Selection for Peak Inductor Current RSET2P Selection for V2 Output Current Limit (Buck Mode) RSET2N Selection for V2 Input Current Limit (Boost Mode) RMON2 Selection for V2 Current Monitoring RSNS1 and RIN1 Selection RSET1P Selection for V1 Input Current Limit (Buck Mode) RSET1N Selection for V1 Output Current Limit (Boost Mode) RMON1 Selection for V1 Current Monitoring Output Voltage, Input Undervoltage and Output Overvoltage Programming Power MOSFET Selection and Efficiency Considerations Optional Schottky Diode (D2 and D3) Selection Top MOSFET Driver Supply (CBST, DBST) Power Path Capacitor Selection Loop Compensation Inrush Current Control Boost Output Short Protection and Timer FAULT Conditions Soft-Start REPORT Feature Paralleling Multiple LT8228s BIAS, DRVCC, INTVCC and Power Dissipation Thermal Shutdown Pin Clearance/Creepage Consideration Efficiency Considerations PC Board Layout Checklist Design Example Package Description Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts
