The output power is 12 w simple LED driver solution1
Silicon's SN3340 inductance buck converter is a continuous model, designed to from a voltage source is higher than the LED efficiently driven single or multiple series of LED. The components of the input voltage range between 6 v to 18 v, and provide an external adjustable up to a constant output current of 750 ma. Depending on the power supply voltage and external components, the device can provide up to 12 watts of power output.
SN3340 contains the output switch and a high side output current detection circuit, which USES an external resistor to set the nominal average output current. Output current can be achieved by applying an external control signal to the pins on the linear ADJ. ADJ pin dc voltage or PWM waveform. Depends on the frequency control, this would provide a continuous output current or gating.
places a 0 on the ADJ pin. 2 v or lower voltage will shut down output, and make the device into the low current standby state. SOT23 - SN3340 adopted 5 and SOT89 - 5 two kinds of packaging, respectively for 350 ma and 700 ma output current applications.
the typical feature of the device including:
circuit is simple, less external components;
, the input voltage range from 6 v to 18 v.
18 v, the internal power switch;
30 v transient maximum tolerance, the input voltage; ,
750 ma output current
,
single pin switch operation, can use voltage or DC PWM signal control brightness efficiency is as high as 95%,
up to 1 MHZ, the switching frequency of the
overheating, inherent LED protection
open, shut off protection circuit
typical application circuit is as follows:
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