S-8813 Datasheet, PDF (13/29 Pages) Seiko Instruments Inc – 3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)

3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
Rev.2.1_00
S-8813 Series
 Application Circuit Examples
1. Variable Current Setting Resistance Type
White
LED
0.22 μF
IOUT1
ON/ OFF
IOUT2
RISET
S-881300
CPE
IOUT3
CPOUT
C+
VIN
C−
GND
4.7 μF
Control signal
10 μF
R₁^*1=
5.6 kΩ to
20 kΩ
Figure 11 Application Circuit 1 (S-881300CPE)
V_IN=3.0 V, Ta=25°C
30
V_IOUT=3.0 V
25
V_IOUT =3.5 V
20
15
10 ^VIOUT^{=4.0 V}
5
0
0
5
10
15
20
R₁^*1 [kΩ]
Figure 12 R_1*1 Dependence (S-881300CPE)
*1. Current setting resistance
19.0
18.5
18.0
17.5
17.0
16.5
16.0
3.00
R1=5.6 kΩ, VIN=3.0 V, Ta=25°C
3.25
3.50
VIOUT [V]
3.75
4.00
Figure 13 V_IOUT Dependence (S-881300CPE)
Seiko Instruments Inc.
13