Datasheet LT8640S-2, LT8643S-2 (Analog Devices) - 9

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