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RT8450/B
High Voltage Multi-Topology LED Driver
General Description
The RT8450/B is a current mode PWM
regulator for LED driving applications.
With an 1.
5A switch on board and wide input (4.
5V to 40V) and/or output (up to 50V)ranges the RT8450/B can operate in any of the three common topologies : Buck, Boost or Buck-Boost.
With 800k/500kHz operating frequency, the external PWM inductor and input/output capacitors can all be small.
High efficiency is achieved by a 190mV current sensing.
Dimming can be done either analog or PWM signal.
An unique built-in clampping comparator and filtering resistor allow easy low noise analog dimming conversion from PWM signal with only one external capacit...