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SM8132AB Folha de dados(PDF) 10 Page - Nippon Precision Circuits Inc

Nome de Peças SM8132AB
Descrição Electrónicos  White LED Driver IC
Download  18 Pages
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Fabricante Electrônico  NPC [Nippon Precision Circuits Inc]
Página de início  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8132AB Folha de dados(HTML) 10 Page - Nippon Precision Circuits Inc

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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


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