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LM3556 数据表(PDF) 11 Page - Texas Instruments |
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LM3556 数据表(HTML) 11 Page - Texas Instruments |
11 / 31 page 40 s/DIV VIN 200 mV/ DIV ILED 200 mA/ DIV 400 s/DIV 500 mA/ DIV VOUT 2V/DIV TX ILED 2V/DIV 1 s/DIV 500 mA/ DIV VOUT 2V/DIV TX ILED 2V/DIV 400 s/DIV 1A/DIV VIN 200 mV/ DIV ILED IIN 1A/DIV 400 s/DIV 1A/DIV VIN 200 mV/ DIV ILED IIN 1A/DIV LM3556 www.ti.com SNVS796C – AUGUST 2011 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Input Voltage Flash Monitor, Up and Down Mode Input Voltage Flash Monitor, Up and Down Mode (0mv Hysteresis, 512 µs Filter Time) (256µs Flash Ramp, 1/2 Step Filter Time) Figure 26. Figure 27. Time Taken for LM3556 to Ramp Impact on LED Current with a TX Event from Torch to Flash after TX Event Figure 28. Figure 29. Transient Plot when VIN Stepped from 3 → 2.9V Figure 30. LM3556 GENERAL INFORMATION The LM3556 is a high-power white LED flash driver capable of delivering up to 1.5A into a single high-powered LED. The device incorporates a 4 MHz constant frequency-synchronous current-mode PWM boost converter, and a single high-side current source to regulate the LED current over the 2.5V to 5.5V input voltage range. The LM3556 PWM converter switches and maintains at least VHR across the current source (LED). This minimum headroom voltage ensures that the current source remains in regulation. If the input voltage is above the LED voltage + current source headroom voltage the device does not switch and turns the PFET on continuously (Pass mode). In Pass mode the difference between (VIN− ILED x RPMOS) and the voltage across the LED is dropped across the current source. Copyright © 2011–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3556 |
类似零件编号 - LM3556 |
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类似说明 - LM3556 |
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