s-8813 Seiko Instruments Inc., s-8813 Datasheet - Page 16

• Manufacturer Part Number: s-8813
• Description: 3-channel White Led Driver Ic Charge Pump Ic With Built-in Constant-current Circuit
• Manufacturer: Seiko Instruments Inc.

Figure 22 I
Figure 24 I
16
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
S-8813 Series
20
16
12
20
16
12
(2) When f
*1. Current setting resistance
*2. The output impedance of the PWM output control signal source when the PWM control signal is “L”
8
4
0
8
4
0
0
0
V
IH
=2.0 V, V
(R
(f
OUT
OUT
PWM
1
20
20
*1
V
PWM
-PWM Duty Ratio Dependence 2
-PWM Duty Ratio Dependence 2
IH
Dependence)
f
Dependence)
=2.0 V, R
PWM
PWM Duty Ratio [%]
PWM Duty Ratio [%]
=20 kHz
IN
=20 kHz
=3.0 V, f
40
40
R
f
1
PWM
R
*1
1
1
=5.6 kΩ, R
*1
*1
V
=10 kHz
=5.6 kΩ, R
=20 kΩ, R
IN
PWM
60
60
=3.0 V, Ta=25°C
=20 kHz, Ta=25°C
Z
*2
80
80
Z
=0 Ω
*2
Z
=0 Ω
*2
=0 Ω,
100
100
Seiko Instruments Inc.
Figure 23 I
Figure 25 I
20
16
12
20
16
12
8
4
0
8
4
0
0
0
(V
(Temp. Dependence)
OUT
OUT
Temp.=−40°C
IN
20
20
V
V
-PWM Duty Ratio Dependence 2
-PWM Duty Ratio Dependence 2
Dependence)
IH
IH
Temp.=25°C
=2.0 V, R
=2.0 V, R
PWM Duty Ratio [%]
PWM Duty Ratio [%]
40
40
V
Temp.=85°C
IN
V
f
=3.0 V
PWM
IN
1
1
=3.0 V, f
*1
*1
V
=5.6 kΩ, R
=5.6 kΩ, R
=20 kHz, Ta=25°C
IN
60
60
=3.5 V
V
PWM
IN
80
=4.5 V
80
=20 kHz
Z
Z
*2
*2
=0 Ω,
=0 Ω,
Rev.2.1
100
100
_00