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SM8135BB データシート(PDF) 10 Page - Nippon Precision Circuits Inc |
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SM8135BB データシート(HTML) 10 Page - Nippon Precision Circuits Inc |
10 / 19 page SM8135B SEIKO NPC CORPORATION —10 In ×1.0 mode, VIN = VOUT. However, the VOUT output does not always reach the electrical characteristics typi- cal rating of 4.9V. However, as long as an insufficient current condition is not detected, ×1.0 mode operation continues. In other words, VOUT may drop below 4.9V if sufficient LED drive current is flowing to counter the LED forward-bias voltage drop VF. The longer the device can operate in the high output efficiency ×1.0 mode, the lower the total current consumption and the longer the battery drive time can be extended. Furthermore, the more that low VF LEDs and lower LED drive current are used, the longer the device can operate automatically in ×1.0 mode. The LED low-current detector circuit switches the output boost mode whenever a single insufficient current condition is detected among the 4 channel LED drive currents, hence drive LEDs with small VF variation should be used to increase overall efficiency. If, after startup, a LED connection to the DIN pins is switched ON/OFF, the LED current detection circuit will operate incorrectly and normal boost mode switching does not occur. Also, if LED drive current control using a DIM pin is not used, the low-current detector circuit does not operate and the boost mode does not switch to either ×1.5 or ×2.0 mode. VIN voltage drop and VOUT output voltage VOUT mode switching time comparison due to drive LED “VF” variation VIN input voltage VOUT mode VOUT output voltage 4.9V 1.0 mode 1.5 mode 1.0 1.5 threshold 1.5 2.0 threshold Lack of LED current detect 2.0 mode High High VF LED Low VF LED VIN input Low 1.0 mode (high efficiency) 1.5 mode 1.0 mode (high efficiency) 2.0 mode (low efficiency) 1.5 mode (low efficiency) 2.0 mode |
同様の部品番号 - SM8135BB |
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同様の説明 - SM8135BB |
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