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SM8135BB Datenblatt(PDF) 9 Page - Nippon Precision Circuits Inc

Teilenummer SM8135BB
Bauteilbeschribung  White LED Driver IC
Download  19 Pages
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Hersteller  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM8135BB Datenblatt(HTML) 9 Page - Nippon Precision Circuits Inc

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SM8135B
SEIKO NPC CORPORATION —9
Boost Mode Auto-switching
The SM8135B switches between
×1.0 mode (VIN through mode), ×1.5 mode (1.5-times charge pump boost),
and
×2.0 mode (2.0-times charge pump boost) automatically in response to the operating state to reduce current
consumption. The switching transition flow chart is shown in the following figure.
This section describes the boost mode switching in response to insufficient LED drive current level detection.
The next section describes the mode reset functions. Initially, when the LED drive current begins to flow, oper-
ation begins in
×1.0 mode at the set current value if possible, without boosting the input voltage VIN. If the set
current value cannot be attained in
×1.0 mode due to a VIN voltage drop or an increase in the set current value,
a low-current detector circuit connected to each LED drive circuit is activated that switches the VOUT output
to
×1.5 mode automatically, and the charge pump circuit starts boosting the voltage by 1.5 times. If the set cur-
rent value still cannot be attained, the LED drive circuits are switched to
×2.0 mode, and the charge pump starts
boosting the voltage by 2 times.
Boost mode switching flow chart
LED ON
1.0 mode
ILED judgment
1.5 mode
ILED judgment
1.5 mode
1.0sec
ILED judgment
sufficient
insufficient
insufficient
1.0sec
2.0 mode
sufficient
ILED judgment
insufficient
sufficient
insufficient
Mode reset
1.5
1.0
Mode reset
2.0
1.5
sufficient


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