100V for power LED strings from just any input
LED driver and controller - LT3756 from Linear Technology offers a possibility to use input voltage from 6 up to 100V at an excellent efficiency.
High-voltage LED driver LT3756 provides a constant voltage current limitting
regulation. It features an exceptional versatility – it can be used in a boost,
buck as well as in buck-boost mode, in a SEPIC or flyback topology, at the up to
97% efficiency. Its 100V floating current sensing enables an exact LED current
control. Precise dimming through PWM enables to reach dimming ranges up to
3000:1. Soft start prevents spiking inrush currents. A big advantage is, that it
is possible to program the frequency of the circuit from 100 kHz to 1 MHz thus
optimizing efficiency while minimizing external components size and cost.
LT3756 provides all this in a miniature 16-pin QFN package with dimensions
only 3x3mm or in a MSOP-16E package. The circuit is available in three versions
– LT3576 and LT3756-2 contains an Open LED status pin, while LT3576-1 has the
same pin in a function of frequency synchronization.
Beside the power LED driving, you can also use the LT3756 in virtually any
power applications where constant voltage current-limitting regulation is
required, for example at battery charging. You can find the examples of
application in the
Design Note 461 as well as in the
LT3756 Design Ideas.
Advantages / Features:
- universal IC for power LEDs driving and other power applications
- wide input voltage range 6 to 100V
- up to 100V output voltage
- constant current and constant voltage regulation
- 3000:1 True color PWM dimming
- 100 mV floating current sensing
- open LED protection
- operation in buck, boost and buck-boost modes, in a SEPIC or flyback
topology
- 100 kHz až 1MHz adjustable frequency
- up to 97% efficiency
- CTRL pin providing analog dimming
- low power-down current <1uA
- programmable soft-start
- thermaly enhnanced QFN-16 package 3x3mm or MSOP-16E
201111040124.11.2011ComponentsSOS electronic s.r.o.