Datasheet LT8650S (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | Dual Channel 4A, 42V, Synchronous Step-Down Silent Switcher 2 with 6.2µA Quiescent Current |
| Pages / Page | 32 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS. Start-Up Dropout Performance. Case … |
| Revision | B |
| File Format / Size | PDF / 3.3 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Start-Up Dropout Performance. Case Temperature Rise
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LT8650S
TYPICAL PERFORMANCE CHARACTERISTICS Start-Up Dropout Performance Case Temperature Rise Case Temperature Rise
120 100 Burst Mode OPERATION DC2407A DEMO BOARD 110 24VIN, LOAD2 = LOAD1 (SYNC = 0V) 12V 90 IN, LOAD2 = LOAD1 VIN1,2 = 12V, fSW = 2MHz 100 12VIN, LOAD2 = 4A 80 VOUT1 = 5V, VOUT2 = 3.3V V 12V IN 90 IN, LOAD2 = 0A 2V/DIV 70 80 70 60 V TURE RISE (°C) TURE RISE (°C) OUT 60 50 2V/DIV 50 40 40 30 30 CASE TEMPERA 20 CASE TEMPERA 100ms/DIV 8650S G41 20 10 5Ω LOAD 10 (1A IN REGULATION) 0 0 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 1 LOAD1 CURRENT (A) DUTY CYCLE OF PULSED LOAD 8650S G42 8650S G43 DC2407A DEMO BOARD CH1 = 0.5A STANDBY, 6A PULSED; CH2 = 0A DC VOUT1 = 5V, VOUT2 = 3.3V, fSW = 2MHz CH1 = 0.5A STANDBY, 6A PULSED; CH2 = 4A DC CH1 = CH2 = 2A STANDBY, 6A PULSED
Radiated EMI Performance (CISPR25 Radiated Conducted EMI Performance Emission Test with Class 5 Peak Limits)
60 50 VERTICAL POLARIZATION 50 45 PEAK DETECTOR 40 40 30 35 V/m) V/m) 30 20 25 10 20 0 15 –10 AMPLITUDE (dBµ AMPLITUDE (dBµ 10 –20 5 SPREAD SPECTRUM MODE CLASS 5 PEAK LIMIT –30 FIXED FREQUENCY MODE SPREAD SPECTRUM MODE 0 FIXED FREQUENCY MODE –40 –5 0 3 6 9 12 15 18 21 24 27 30 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) FREQUENCY (MHz) DC2407A DEMO BOARD 8650S G44 DC2407A DEMO BOARD 8650S G45 (WITH EMI FILTER INSTALLED) (WITH EMI FILTER INSTALLED) 12V INPUT TO 5V OUTPUT1 AT 4A AND 3.3V OUTPUT2 AT 4A, fSW = 2MHz 12V INPUT TO 5V OUTPUT1 AT 4A AND 3.3V OUTPUT2 AT 4A, fSW = 2MHz Rev. B For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Start-Up Dropout Performance Case Temperature Rise Case Temperature Rise
120 100 Burst Mode OPERATION DC2407A DEMO BOARD 110 24VIN, LOAD2 = LOAD1 (SYNC = 0V) 12V 90 IN, LOAD2 = LOAD1 VIN1,2 = 12V, fSW = 2MHz 100 12VIN, LOAD2 = 4A 80 VOUT1 = 5V, VOUT2 = 3.3V V 12V IN 90 IN, LOAD2 = 0A 2V/DIV 70 80 70 60 V TURE RISE (°C) TURE RISE (°C) OUT 60 50 2V/DIV 50 40 40 30 30 CASE TEMPERA 20 CASE TEMPERA 100ms/DIV 8650S G41 20 10 5Ω LOAD 10 (1A IN REGULATION) 0 0 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 1 LOAD1 CURRENT (A) DUTY CYCLE OF PULSED LOAD 8650S G42 8650S G43 DC2407A DEMO BOARD CH1 = 0.5A STANDBY, 6A PULSED; CH2 = 0A DC VOUT1 = 5V, VOUT2 = 3.3V, fSW = 2MHz CH1 = 0.5A STANDBY, 6A PULSED; CH2 = 4A DC CH1 = CH2 = 2A STANDBY, 6A PULSED
Radiated EMI Performance (CISPR25 Radiated Conducted EMI Performance Emission Test with Class 5 Peak Limits)
60 50 VERTICAL POLARIZATION 50 45 PEAK DETECTOR 40 40 30 35 V/m) V/m) 30 20 25 10 20 0 15 –10 AMPLITUDE (dBµ AMPLITUDE (dBµ 10 –20 5 SPREAD SPECTRUM MODE CLASS 5 PEAK LIMIT –30 FIXED FREQUENCY MODE SPREAD SPECTRUM MODE 0 FIXED FREQUENCY MODE –40 –5 0 3 6 9 12 15 18 21 24 27 30 0 100 200 300 400 500 600 700 800 900 1000 FREQUENCY (MHz) FREQUENCY (MHz) DC2407A DEMO BOARD 8650S G44 DC2407A DEMO BOARD 8650S G45 (WITH EMI FILTER INSTALLED) (WITH EMI FILTER INSTALLED) 12V INPUT TO 5V OUTPUT1 AT 4A AND 3.3V OUTPUT2 AT 4A, fSW = 2MHz 12V INPUT TO 5V OUTPUT1 AT 4A AND 3.3V OUTPUT2 AT 4A, fSW = 2MHz Rev. B For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
