S1F76680 Epson Electronics America, Inc., S1F76680 Datasheet - Page 12
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S1F76680
Manufacturer Part Number
S1F76680
Description
Led Driver
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.S1F76680.pdf
(29 pages)
7. OPERATIONAL AND FUNCTIONAL DESCRIPTION
7.2 Setting and operating state
7.3 LED current setting
7.3.1 Setting of maximum current value
8
*1 EN2=H when either EN2 pin or I
*2 The standby current value depends on the setting of EN2 pin I
The LED’s maximum current value is determined by the resistance value of resistor RLED connected with
AOUT pin.
The current value that can be set with I
(The current value can be set in the unit of one 127th of ILEDmax)
Connect resistor RLED as shown below, and be sure connect it between AOUT pin and V
Determine RLED from the following formula:
Maximum current set value = ILEDmax (mA), resistance value = RLED (kΩ)
For example, when ILEDmax=20mA is to be set, RLED=10kΩ.
EN1
H
H
H
H
L
X *2
EN2
*1
H
X
X
L
RLED=200 / ILEDmax
EN3
X
H
L
L
L
2
C register SEN2 (see No.P14) is set to HIGH.
2
C register described later cannot exceed this maximum current value.
(I
2
C register)
NLED
X
X
H
L
L
RLED
EPSON
S1F76680
AOUT
LED lights up
LED lights up
V
LED lights up
SS3
2
C register (SEN2). (See No.P21)
(After completion of soft start)
2
3
S1F76680 Technical Manual (Rev.1.22)
(Under automatic luminance control)
(At fixed current set in the register)
Operating state
LED lights off
1
Standby
(At maximum current)
SS3
.