參數(shù)資料
型號(hào)： SM8131B00B
廠商： Seiko NPC Corporation
英文描述： The SM8131B is a charge pump DC/DC converter that switches between 1 and 1.5 automatically.
中文描述： 該SM8131B是一個(gè)電荷泵DC / DC轉(zhuǎn)換器，1至1.5自動(dòng)切換。
文件頁(yè)數(shù)： 9/21頁(yè)
文件大?。?/td> 218K
代理商： SM8131B00B
SM8131B
NIPPON PRECISION CIRCUITS INC.—9
V
OUT
Output Circuit Mode Switching
The SM8131B 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 SM8131B switches from standby condition (power-save mode) to normal operating condition (
×
1.0/
×
1.5
mode) on the
fi
rst rising edge of either EN1 or EN2. Note that if the VIN supply voltage is applied when EN1
or EN2 is HIGH, startup occurs after the internal power-ON reset time (approximately 50
μ
s) expires. At star-
tup, operation commences in
×
1.5 mode for a
fi
xed 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
μ
s after the power is applied.
(3) If EN1 or EN2 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 EN1 and EN2 are LOW when power is applied,
the
“
CE
”
rising edge occurs simultaneously with the
fi
rst rising edge.
(1) If the EN signals are input after POR time is expired, the soft start time begin from the
fi
rst EN input rising
edge. The current setting can be adjusted during the soft-start time.
(2) LED current starts
fl
ow immediately before the soft start time expires.
Power-ON reset operation
Soft start time and LED current
V
IN
power source
Power save
mode
1.5 mode
Power on
reset output
Internal
enable (CE)
POR time
typ: 50
μ
s
(1)
(2)
(3)
V
IN
Soft start time
EN1
input signal
LED current
(1)
(2)
Dimming pulses enable
EN1
LED ON
typ: 1.3ms
Soft start time
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