preliminary TTP933 2013/08/23 page j 1?25 ver. j 1.2 1.5a led driver with internal switch
preliminary TTP933 2013/08/23 page j 2?25 ver. j 1.2 . general description TTP933 is a high efficiency , constant current , c ontinuous mode inductive step-down converter, designed for driving constant current to high power (single or multiple) led with only 4 external components. TTP933 operates from input supply betw een 5v and 33v and provides an externally adjustable output current of up to 1.5a. the TTP933 is specifically designed with pfm control to enhance the efficiency up to 97%. the output current can be modify by an external resister , and can adjusted , by a pplying an external control signal to the dim pin , the dim pin will accept a pwm waveform. additionally, to ensure the system reliability , TTP933 is built-in with over temperature protection, and led open-circuit short-circuit protecti on to protect system from being damaged. . features ? 1.5a output current ? wide input voltage range: 5v to 33v ? high efficiency (up to 97%) ? internal ndmos power switch ? single pin on/off and brightness control using pwm ? hysteretic pfm improves e fficiency at light loads ? with thermal/soft start /led open-short detect protection ? only 4 external components ? up to 1mhz switching frequency ? typical 3% output current accuracy . applications z high power led lighting z automotive led lighting z low voltage industrial lighting z led back-up lighting z constant current source
preliminary TTP933 2013/08/23 page j 3?25 ver. j 1.2 . package type TTP933-jo8 dim en 5 gnd gnd TTP933-fa6 sot23-6 6 sen sw vin 4 dim 3 2 1 TTP933-gg5 vin sen gnd dim 5 sw 1 sot89-5 4 3 2 to-252 TTP933-he5 vin sen gnd dim 5 4 3 2 1 sw sop-8 gnd dgnd sw sw sen vin 8 7 6 5 4 3 2 1 sop-8 gnd dgnd sw sw en dim sen vin TTP933-do8 8 7 6 5 4 3 2 1 dgnd gnd sop-8 TTP933-co8 8 7 6 5 sw dim sen 4 3 2 1 vin 5 gnd sen sw vin 4 TTP933-ea5 sot23-5 dim 3 2 1 dgnd gnd msop-8 TTP933-bm8 8 7 6 5 sw dim sen 4 3 2 1 vin 5 5 1 # . . 4 0 1 x j u i 5 i f s n b m 1 b e
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