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.
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- 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
- programmable soft-start
- thermaly enhnanced QFN-16 package 3x3mm or MSOP-16E
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