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LM3414 数据表(PDF) 10 Page - Texas Instruments |
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LM3414 数据表(HTML) 10 Page - Texas Instruments |
10 / 25 page VLED VIN 400 nS x fSW t 0 1 2 3 4 5 6 7 8 9 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 RIADJ(k ) LM3414, LM3414HV SNVS678E – JUNE 2010 – REVISED MAY 2013 www.ti.com Figure 15. LED Current vs RIADJ Table 2. Examples for IOUT Settings IOUT (mA) RIADJ (kΩ) 350 8.93 500 6.25 700 4.46 1000 3.13 The LED current can be set to any level in the range from 350 mA to 1A. In order to provide accurate LED current, RIADJ should be a resistor with no more than 0.5% tolerance. If the IADJ pin is accidentally shorted to GND (RIADJ = 0), the output current will be limited to avoid damaging the circuit. When the over current protection is activated, current regulation cannot be maintained until the over-current condition is cleared. MINIMUM SWITCH ON-TIME As the LM3414 features a 400 ns minimum ON time, it is essential to make sure the ON time of the internal switch is not shorter than 400 ns when setting the LED driving current. If the switching ON time is shorter than 400 ns, the accuracy of the LED current may not maintain and exceed the rated current of the LEDs. The ratio of the LED forward voltage to input voltage is restricted by the following restriction: (3) PEAK SWITCH CURRENT LIMIT The LM3414/14HV features an integrated switch current limiting mechanism that protects the LEDs from being overdriven. The switch current limiter will be triggered when the switch current is three times exceeding the current level set by RIADJ. Once the current limiter is triggered, the internal power switch turns OFF for 3.6 µs to allow the inductor to discharge and cycles repetitively until the over current condition is removed. The current limiting feature is exceptionally important to avoid permanent damage of the LM3414/14HV application circuit due to short circuit of LED string. 10 Submit Documentation Feedback Copyright © 2010–2013, Texas Instruments Incorporated Product Folder Links: LM3414 LM3414HV |
类似零件编号 - LM3414 |
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类似说明 - LM3414 |
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