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SM8136A Scheda tecnica(PDF) 10 Page - Nippon Precision Circuits Inc |
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SM8136A Scheda tecnica(HTML) 10 Page - Nippon Precision Circuits Inc |
10 / 15 page SM8136A SEIKO NPC CORPORATION —10 A mode hold signal of 200 µs (max) duration is output immediately after switching to ×1.0 mode. The VOUT output is held in ×1.0 mode and any LED drive current insufficient detection signal is ignored during the mode hold signal output. For example, if the VIN voltage drops and the VOUT output voltage in ×1.0 mode cannot provide sufficient current to drive the LEDs, a LED drive current insufficient condition occurs momentarily due to the mode reset. The LED low-current detector circuit outputs a LED drive current insufficient signal imme- diately after switching modes, but during the mode hold time the device stays in ×1.0 mode and does not switch to ×1.5 mode. Consequently, the VOUT voltage drops and the LED brightness decreases during the 85µs (min) to 200 µs (max) mode hold time. However, a 200µs decrease in the brightness is not a problem as it is not perceptible to the human eye. VOUT drop due to mode reset signal Mode reset (1 sec/cycle) Mode hold (L: hold) Low ILED detector (H: Low ILED) VOUT voltage VIN voltage 1.0sec 5.0V max 200 µS VOUT mode (H: 1.5, L: 1.0) 1.0 1.5 threshold |
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