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LM3414SD Scheda tecnica(PDF) 9 Page - Texas Instruments |
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LM3414SD Scheda tecnica(HTML) 9 Page - Texas Instruments |
9 / 25 page ILED = 3125 x 10 3 RIADJ mA fSW = 20 x 10 6 RFS kHz LM3414, LM3414HV www.ti.com SNVS678E – JUNE 2010 – REVISED MAY 2013 APPLICATION INFORMATION SETTING THE SWITCHING FREQUENCY Both the LM3414 and LM3414HV are PWM LED drivers that contain a clock generator to generate constant switching frequency for the device. The switching frequency is determined by the resistance of an external resistor RFS in the range of 250 kHz to 1 MHz. Lower resistance of RFS results in higher switching frequency. The switching frequency of the LM3414/14HV is governed by the following equation: (1) Figure 14. Switching Frequency vs RFS Table 1. Examples for fSW Settings fSW (kHz) RFS (kΩ) 250 80 500 40 1000 20 To ensure accurate current regulation, the LM3414/14HV should be operated in continuous conduction mode (CCM) and the on time should not be shorter than 400 ns under all operation condition. SETTING LED CURRENT The LM3414/14HV requires no external current sensing resistor for LED current regulation. The average output current of the LM3414/14HV is adjustable by varying the resistance of the resistor, RIADJ that connects across the IADJ and GND pins. The IADJ pin is internally biased to 1.255V. The LED current is then governed by the following equation: where • 350 mA < ILED < 1A (2) Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3414 LM3414HV |
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