Datasheet LT8636, LT8637 (Analog Devices) - 9
| 制造商 | Analog Devices |
| 描述 | 42V, 5A/7A Peak Synchronous Step-Down Silent Switcher with 2.5µA Quiescent Current |
| 页数 / 页 | 32 / 9 — TYPICAL PERFORMANCE CHARACTERISTICS. Case Temperature Rise vs 7A. Case … |
| 修订版 | C |
| 文件格式/大小 | PDF / 2.7 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. Case Temperature Rise vs 7A. Case Temperature Rise. Pulsed Load. Switching Rising Edge
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LT8636/LT8637
TYPICAL PERFORMANCE CHARACTERISTICS Case Temperature Rise vs 7A Case Temperature Rise Pulsed Load Switching Rising Edge
80 135 VIN = 12V, fSW = 1MHz DC2918A DEMO BOARD V 70 IN = 24V, fSW = 1MHz 120 VIN = 12V VIN = 12V, fSW = 2MHz VOUT = 5V VIN = 24V, fSW = 2MHz 60 105 fSW = 2MHz DEMO BOARD IN STILL AIR STANDBY LOAD = 0.25A 90 50 L = XEL6030, 1.5µH 1kHz PULSED LOAD = 7A VSW 75 2V/DIV TURE RISE (°C) 40 TURE RISE (°C) 60 30 45 20 30 CASE TEMPERA CASE TEMPERA 8636 G39 10 2ns/DIV 15 VIN = 12V 0 0 ILOAD = 2A 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8636 G37 8636 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 8636 G40 5µs/DIV 8636 G41 500ns/DIV 8636 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
LT8636 Transient Response; LT8637 Transient Response; Internal Compensation External Compensation
ILOAD ILOAD 2A/DIV 2A/DIV VOUT VOUT 100mV/DIV 100mV/DIV 20µs/DIV 8636 G43 20µs/DIV 8636 G44 FRONT PAGE APPLICATION 2A TO 4A TRANSIENT 2A TO 4A TRANSIENT 12VIN, 5VOUT 12VIN, 5VOUT fSW = 2MHz fSW = 2MHz CC = 330pF, RC = 8.45k COUT = 100µF, CLEAD = 10pF COUT = 100µF, CLEAD = 4.7pF Rev. C For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS Case Temperature Rise vs 7A Case Temperature Rise Pulsed Load Switching Rising Edge
80 135 VIN = 12V, fSW = 1MHz DC2918A DEMO BOARD V 70 IN = 24V, fSW = 1MHz 120 VIN = 12V VIN = 12V, fSW = 2MHz VOUT = 5V VIN = 24V, fSW = 2MHz 60 105 fSW = 2MHz DEMO BOARD IN STILL AIR STANDBY LOAD = 0.25A 90 50 L = XEL6030, 1.5µH 1kHz PULSED LOAD = 7A VSW 75 2V/DIV TURE RISE (°C) 40 TURE RISE (°C) 60 30 45 20 30 CASE TEMPERA CASE TEMPERA 8636 G39 10 2ns/DIV 15 VIN = 12V 0 0 ILOAD = 2A 0 1 2 3 4 5 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (A) DUTY CYCLE OF 7A LOAD 8636 G37 8636 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 8636 G40 5µs/DIV 8636 G41 500ns/DIV 8636 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
LT8636 Transient Response; LT8637 Transient Response; Internal Compensation External Compensation
ILOAD ILOAD 2A/DIV 2A/DIV VOUT VOUT 100mV/DIV 100mV/DIV 20µs/DIV 8636 G43 20µs/DIV 8636 G44 FRONT PAGE APPLICATION 2A TO 4A TRANSIENT 2A TO 4A TRANSIENT 12VIN, 5VOUT 12VIN, 5VOUT fSW = 2MHz fSW = 2MHz CC = 330pF, RC = 8.45k COUT = 100µF, CLEAD = 10pF COUT = 100µF, CLEAD = 4.7pF Rev. C For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Applications Related Parts