Datasheet LT3002 (Analog Devices) - 10
| 制造商 | Analog Devices |
| 描述 | 36V 10W No-Opto Isolated Flyback Converter |
| 页数 / 页 | 12 / 10 — APPLICATIONS INFORMATION. Step 10: Ensure minimum load |
| 文件格式/大小 | PDF / 811 Kb |
| 文件语言 | 英语 |
APPLICATIONS INFORMATION. Step 10: Ensure minimum load
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LT3002
APPLICATIONS INFORMATION
Determine the UVLO thresholds and calculate R2 resistor
Step 10: Ensure minimum load.
value: The theoretical minimum load can be approximately esti- 1.228V • R ( 1+R2) mated as: VIN(UVLO+)= + 2.5µA •R1 R2 9µH • (1.04A)2 •12.7kHz I =12.4mA Example: LOAD(MIN) = 2 • 5V Set VIN UVLO rising threshold to 7.5V: Remember to check the minimum load requirement in R2 = 232k real application. The minimum load occurs at the point V where the output voltage begins to climb up as the con- IN(UVLO+) = 7.5V verter delivers more energy than what is consumed at VIN(UNLO–) = 5.5V the output. The real minimum load for this application is about 10mA. In this example, a 500Ω resistor is selected as the minimum load. Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description
APPLICATIONS INFORMATION
Determine the UVLO thresholds and calculate R2 resistor
Step 10: Ensure minimum load.
value: The theoretical minimum load can be approximately esti- 1.228V • R ( 1+R2) mated as: VIN(UVLO+)= + 2.5µA •R1 R2 9µH • (1.04A)2 •12.7kHz I =12.4mA Example: LOAD(MIN) = 2 • 5V Set VIN UVLO rising threshold to 7.5V: Remember to check the minimum load requirement in R2 = 232k real application. The minimum load occurs at the point V where the output voltage begins to climb up as the con- IN(UVLO+) = 7.5V verter delivers more energy than what is consumed at VIN(UNLO–) = 5.5V the output. The real minimum load for this application is about 10mA. In this example, a 500Ω resistor is selected as the minimum load. Rev. 0 10 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Package Description