Datasheet LT3743 (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | High Current Synchronous Step-Down LED Driver with Three-State Control |
| 页数 / 页 | 28 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS. LED Current Waveforms. Overcurrent … |
| 文件格式/大小 | PDF / 535 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS. LED Current Waveforms. Overcurrent Threshold. (90% PWM) 0.5A to 5A. (2000:1) 3A to 10A
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LT3743
TYPICAL PERFORMANCE CHARACTERISTICS LED Current Waveforms LED Current Waveforms Overcurrent Threshold (90% PWM) 0.5A to 5A (2000:1) 3A to 10A
120 CTRL_SEL CTRL_SEL 100 5V/DIV 5V/DIV SW 20V/DIV ILED – (mV) 80 5A/DIV SENSE 60 ILED + – V 5A/DIV 40 I I L L V SENSE 10A/DIV 10A/DIV 20 40µs/DIV 3743 G29 5µs/DIV 3743 G30 0 0 0.75 1.5 2.25 3.0 CTRL_H (V) 3743 G28
LED Current Waveforms (3000:1) LED Current Waveforms LED Current Waveforms Analog Dimming on CTRL_L (3000:1) 2A to 20A (3000:1) 0A to 2A to 20A COUT(LOW) = 22µF, COUT(HIGH) = 1mF
CTRL_SEL PWM CTRL_SEL 5V/DIV 5V/DIV 5V/DIV PWM CTRL_L 5V/DIV 0.2V/DIV SW 10V/DIV SW CTRL_SEL 10V/DIV 5V/DIV ILED ILED ILED 11.1A/DIV 10A/DIV 8A/DIV 20µs/DIV 3743 G31 20µs/DIV 3743 G32 40µs/DIV 3743 G33
Voltage Regulation with 10A Overvoltage Lockout Operation Regulated Inductor Current Common Mode Lockout (VIN = 7V) With Open-Load Condition
IL VOUT VOUT 200mA/DIV 2V/DIV 2V/DIV VOUT IL IL 2V/DIV 5A/DIV 200mA/DIV 100µs/DIV 3743 G34 1ms/DIV 3743 G35 40ms/DIV 3743 G36 3743fe 8 For more information www.linear.com/LT3743 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information 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 LED Current Waveforms LED Current Waveforms Overcurrent Threshold (90% PWM) 0.5A to 5A (2000:1) 3A to 10A
120 CTRL_SEL CTRL_SEL 100 5V/DIV 5V/DIV SW 20V/DIV ILED – (mV) 80 5A/DIV SENSE 60 ILED + – V 5A/DIV 40 I I L L V SENSE 10A/DIV 10A/DIV 20 40µs/DIV 3743 G29 5µs/DIV 3743 G30 0 0 0.75 1.5 2.25 3.0 CTRL_H (V) 3743 G28
LED Current Waveforms (3000:1) LED Current Waveforms LED Current Waveforms Analog Dimming on CTRL_L (3000:1) 2A to 20A (3000:1) 0A to 2A to 20A COUT(LOW) = 22µF, COUT(HIGH) = 1mF
CTRL_SEL PWM CTRL_SEL 5V/DIV 5V/DIV 5V/DIV PWM CTRL_L 5V/DIV 0.2V/DIV SW 10V/DIV SW CTRL_SEL 10V/DIV 5V/DIV ILED ILED ILED 11.1A/DIV 10A/DIV 8A/DIV 20µs/DIV 3743 G31 20µs/DIV 3743 G32 40µs/DIV 3743 G33
Voltage Regulation with 10A Overvoltage Lockout Operation Regulated Inductor Current Common Mode Lockout (VIN = 7V) With Open-Load Condition
IL VOUT VOUT 200mA/DIV 2V/DIV 2V/DIV VOUT IL IL 2V/DIV 5A/DIV 200mA/DIV 100µs/DIV 3743 G34 1ms/DIV 3743 G35 40ms/DIV 3743 G36 3743fe 8 For more information www.linear.com/LT3743 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts