Datasheet LT8640S-2, LT8643S-2 (Analog Devices) - 9
| Manufacturer | Analog Devices |
| Description | 42V, 6A Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| Pages / Page | 30 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS. Case Temperature Rise vs 7A. Case … |
| File Format / Size | PDF / 2.6 Mb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. Case Temperature Rise vs 7A. Case Temperature Rise. Pulsed Load. Switching Rising Edge
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LT8640S-2/LT8643S-2
TYPICAL PERFORMANCE CHARACTERISTICS Case Temperature Rise vs 7A Case Temperature Rise Pulsed Load Switching Rising Edge
80 90 DC2530A DEMO BOARD DC2530A DEMO BOARD 70 80 V V IN = 12V, fSW = 1MHz IN = 12V V V IN = 24V, fSW = 1MHz OUT = 5V 60 70 V f IN = 12V, fSW = 2MHz SW = 2MHz V STANDBY LOAD = 0.25A IN = 24V, fSW = 2MHz 60 50 1kHz PULSED LOAD = 7A VSW 50 2V/DIV TURE RISE (°C) 40 TURE RISE (°C) 40 30 30 20 20 CASE TEMPERA CASE TEMPERA 8640s2 G39 10 2ns/DIV 10 VIN = 12V 0 0 ILOAD = 2A 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8640s2 G37 8640s2 G38
Switching Waveforms, Full Switching Waveforms, Burst Frequency Continuous Operation Mode Operation Switching Waveforms
IL 1A/DIV I I L L 500mA/DIV 1A/DIV VSW 5V/DIV V V SW SW 5V/DIV 10V/DIV 500ns/DIV 8640s2 G40 5µs/DIV 8640s2 G41 500ns/DIV 8640s2 G42 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12V 36V IN TO 5VOUT AT 1A 12VIN TO 5VOUT AT 10mA IN TO 5VOUT AT 1A VSYNC = 0V
LT8640S-2 Transient Response; LT8643S-2 Transient Response; Internal Compensation External Compensation
ILOAD ILOAD 2A/DIV 2A/DIV VOUT VOUT 100mV/DIV 100mV/DIV 20µs/DIV 8640s2 G43 20µs/DIV 8640s2 G44 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 2A TO 4A TRANSIENT 2A TO 4A TRANSIENT 12VIN, 5VOUT 12VIN, 5VOUT fSW = 2MHz fSW = 2MHz COUT = 100µF, CLEAD = 10pF CC = 330pF, RC = 8.45k COUT = 100µF, CLEAD = 4.7pF Rev 0 For more information www.analog.com 9 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION E LECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATIONS RELATED PARTS
TYPICAL PERFORMANCE CHARACTERISTICS Case Temperature Rise vs 7A Case Temperature Rise Pulsed Load Switching Rising Edge
80 90 DC2530A DEMO BOARD DC2530A DEMO BOARD 70 80 V V IN = 12V, fSW = 1MHz IN = 12V V V IN = 24V, fSW = 1MHz OUT = 5V 60 70 V f IN = 12V, fSW = 2MHz SW = 2MHz V STANDBY LOAD = 0.25A IN = 24V, fSW = 2MHz 60 50 1kHz PULSED LOAD = 7A VSW 50 2V/DIV TURE RISE (°C) 40 TURE RISE (°C) 40 30 30 20 20 CASE TEMPERA CASE TEMPERA 8640s2 G39 10 2ns/DIV 10 VIN = 12V 0 0 ILOAD = 2A 0 1 2 3 4 5 6 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8640s2 G37 8640s2 G38
Switching Waveforms, Full Switching Waveforms, Burst Frequency Continuous Operation Mode Operation Switching Waveforms
IL 1A/DIV I I L L 500mA/DIV 1A/DIV VSW 5V/DIV V V SW SW 5V/DIV 10V/DIV 500ns/DIV 8640s2 G40 5µs/DIV 8640s2 G41 500ns/DIV 8640s2 G42 FRONT PAGE APPLICATION FRONT PAGE APPLICATION FRONT PAGE APPLICATION 12V 36V IN TO 5VOUT AT 1A 12VIN TO 5VOUT AT 10mA IN TO 5VOUT AT 1A VSYNC = 0V
LT8640S-2 Transient Response; LT8643S-2 Transient Response; Internal Compensation External Compensation
ILOAD ILOAD 2A/DIV 2A/DIV VOUT VOUT 100mV/DIV 100mV/DIV 20µs/DIV 8640s2 G43 20µs/DIV 8640s2 G44 FRONT PAGE APPLICATION FRONT PAGE APPLICATION 2A TO 4A TRANSIENT 2A TO 4A TRANSIENT 12VIN, 5VOUT 12VIN, 5VOUT fSW = 2MHz fSW = 2MHz COUT = 100µF, CLEAD = 10pF CC = 330pF, RC = 8.45k COUT = 100µF, CLEAD = 4.7pF Rev 0 For more information www.analog.com 9 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION E LECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATIONS RELATED PARTS
