s-8813 Seiko Instruments Inc., s-8813 Datasheet - Page 15

• 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 18 I
Figure 20 I
Rev.2.1
20
16
12
20
16
12
3. Regulating Luminance Circuit via PWM control signal (It corresponds only to S-881300CPE.)
(1) 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
V
0
0
IH
White
LED
3-CHANNEL WHITE LED DRIVER IC (CHARGE PUMP IC WITH BUILT-IN CONSTANT-CURRENT CIRCUIT)
_00
=2.0 V, V
(R
(f
OUT
OUT
PWM
1
20
20
*1
V
PWM
-PWM Duty Ratio Dependence 1
-PWM Duty Ratio Dependence 1
IH
Dependence)
Dependence)
=2.0 V, R
PWM Duty Ratio [%]
PWM Duty Ratio [%]
=1.0 kHz
IN
=3.0 V, f
40
40
f
PWM
R
1
*1
R
f
PWM
=100 Hz
=5.6 kΩ, R
1
1
*1
*1
V
=20 kΩ, R
=5.6 kΩ, R
=1.0 kHz
IN
PWM
60
60
0.22 μF
=3.0 V, Ta=25°C
Figure 17 Application Circuit 3 (S-881300CPE)
=1.0 kHz, Ta=25°C
Z
*2
Z
=0 Ω
80
80
*2
=0 Ω
Z
*2
=0 Ω,
100
100
IOUT1
IOUT2
IOUT3
C+
C−
S-881300
Seiko Instruments Inc.
CPE
ON/ OFF
CPOUT
RISET
GND
VIN
Figure 19 I
Figure 21 I
20
16
12
20
16
12
8
4
0
8
4
0
0
0
4.7 μF
(V
(Temp. Dependence)
OUT
OUT
IN
20
20
V
V
-PWM Duty Ratio Dependence 1
-PWM Duty Ratio Dependence 1
Dependence)
IH
IH
=2.0 V, R
=2.0 V, R
R
PWM Duty Ratio [%]
PWM Duty Ratio [%]
1
*1
=5.6 kΩ to 20 kΩ
40
Temp.=−40°C
40
V
V
f
IN
PWM
IN
V
Temp.=25°C
=3.0 V
IN
=3.0 V, f
1
1
10 μF
*1
*1
=3.5 V
=1.0 kHz, Ta=25°C
=5.6 kΩ, R
=5.6 kΩ, R
60
60
V
Temp.=85°C
IN
=4.5 V
PWM
Control
80
80
S-8813 Series
=1.0 kHz
Z
Z
*2
*2
=0 Ω,
=0 Ω,
signal
PWM
control
100
100
signal
15