YB1315 Datasheet, PDF (5/10 Pages) YOBON TECHNOLOGIES,INC. – High Efficiency Charge Pump White LED Driver

Preliminary YB1315
High Efficiency Charge Pump White LED Driver
Typical Performance Characteristics
V_IN =3.6V, C_IN =4.7μF, C1=C2=0.47μF, C_OUT = 1μF, unless otherwise noted.
Efficiency vs. Supply Voltage (I_LED=20mA)
LED Efficiency
90
80
70
60
50
40
30
20
10
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VI (V)
Dimming Response
I_LED1
DC
Coupled
20mA/Div
EN2/EN1
DC
Coupled
2V/Div
V_IN=3.6V, I_LED=20mA
5 LEDs connected,
f= 1k Hz
Time=500μs/div
V_EN2/V_EN1
DC
Coupled
5V/Div
V_OUT
DC
Coupled
2V/Div
I_IN
DC
Coupled
200mA/Div
1X Mode, Software
Time=100μs/div
Dimming Respons
I_LED1
DC
Coupled
20mA/Div
EN2/EN1
DC
Coupled
2V/Div
V_IN=3.6V, I_LED=20mA
5 LEDs connected,
f= 32k Hz
Time=500μs/div
Input and Output Voltage Ripple
V_IN
AC
Coupled
50mV/Div
V_OUT
AC
Coupled
50mV/Div
VIN=3.4V, 1.5X
ILED1=20mA
5LEDs connected
Time=1μs/div
LED1 Current VS Duty Cycle
18
16
14
12
10
8
6
4
2
0
0
10
20
30
40
50
60
70
80
90
Duty Cycle ( %)
YB1315 Rev.0.1
www.yobon.com.tw
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