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LM3414SDX Scheda tecnica(PDF) 10 Page - Texas Instruments

Il numero della parte LM3414SDX
Spiegazioni elettronici  1A 60W Common Anode Capable Constant Current Buck LED Driver Requires No
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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
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