S-8813 Datasheet, PDF (16/29 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)
S-8813 Series
Rev.2.1_00
(2) When f_PWM=20 kHz
VIH=2.0 V, VIN=3.0 V, fPWM=20 kHz, Ta=25°C
20
16
R1^*1=5.6 kΩ, RZ^*2=0 Ω
12
R1^*1=20 kΩ, RZ^*2=0 Ω
8
4
0
0
20
40
60
80 100
PWM Duty Ratio [%]
Figure 22 I_OUT-PWM Duty Ratio Dependence 2
(R_1*1 Dependence)
VIH=2.0 V, R1^*1=5.6 kΩ, RZ^*2=0 Ω,
fPWM=20 kHz, Ta=25°C
20
16
VIN=3.0 V
VIN=3.5 V
12
VIN=4.5 V
8
4
0
0 20 40 60 80 100
PWM Duty Ratio [%]
Figure 23 I_OUT-PWM Duty Ratio Dependence 2
(V_IN Dependence)
VIH=2.0 V, R1^*1=5.6 kΩ, RZ^*2=0 Ω,
VIN=3.0 V, Ta=25°C
20
fPWM=20 kHz
16
fPWM=10 kHz
12
8
4
0
0
20 40
60 80 100
PWM Duty Ratio [%]
Figure 24 I_OUT-PWM Duty Ratio Dependence 2
(f_PWM Dependence)
V_IH=2.0 V, R₁^*1=5.6 kΩ, R_Z^*2=0 Ω,
V_IN=3.0 V, f_PWM=20 kHz
20
Temp.=−40°C
16
Temp.=25°C
Temp.=85°C
12
8
4
0
0
20 40
60
80 100
PWM Duty Ratio [%]
Figure 25 I_OUT-PWM Duty Ratio Dependence 2
(Temp. Dependence)
*1. Current setting resistance
*2. The output impedance of the PWM output control signal source when the PWM control signal is “L”
16
Seiko Instruments Inc.