S1F76680 Epson Electronics America, Inc., S1F76680 Datasheet - Page 12

• Manufacturer Part Number: S1F76680
• Description: Led Driver
• Manufacturer: Epson Electronics America, Inc.

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
.