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SM8132A 数据表(PDF) 10 Page - Nippon Precision Circuits Inc |
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SM8132A 数据表(HTML) 10 Page - Nippon Precision Circuits Inc |
10 / 18 page SM8132A NIPPON PRECISION CIRCUITS INC.—10 VOUT Output Circuit Mode Switching The SM8132A switches between 3 output states: power-save mode (standby state), ×1.0 mode (VIN through mode), and ×1.5 mode (×1.5 charge pump boost). This automatically adjusts the VOUT output to match the drive LED characteristics and reduces the total power dissipation. Switching to and from ×1.0 and ×1.5 mode occurs automatically in an internal circuit, and cannot be controlled using an external input. Power-ON internal reset time The SM8132A switches from standby condition (power-save mode) to normal operating condition ( ×1.0/×1.5 mode) on the first rising edge of EN. Note that if the VIN supply voltage is applied when EN is HIGH, startup occurs after the internal power-ON reset time (approximately 50 µs) expires. At startup, operation commences in ×1.5 mode for a fixed interval during the soft-start time in order to determine whether a LED is connected to each DIN pin. (1) VIN voltage rises when power is applied. (2) Power-ON reset (POR) circuit resets internal circuits approximately 50 µs after the power is applied. (3) If EN is HIGH when power is applied, the internal circuits start operating when the internal “CE” signal rising edge occurs after the power-ON reset time. If EN is LOW when power is applied, the “CE” rising edge occurs simultaneously with the first rising edge. (1) If the EN signals are input after POR time is expired, the soft start time begin from the first EN input rising edge. The current setting can be adjusted during the soft-start time. (2) LED current starts flow immediately before the soft start time expires. Power-ON reset operation Soft start time and LED current VIN power source Power save mode 1.5 mode Power on reset output Internal enable (CE) POR time typ: 50 µs (1) (2) (3) VIN Soft start time EN input signal LED current (1) (2) Dimming pulses enable LED ON typ: 1.3ms Soft start time EN |
类似零件编号 - SM8132A |
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类似说明 - SM8132A |
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