Diodes AP3036/A - Manual (Page 9)

Preliminary Datasheet
WHITE LED STEP-UP CONVERTER AP3036/A
Jul. 2012 Rev. 1.3 . BCD Semiconductor Manufacturing Limited
9
0 20 40 60 80 100
0
5
10
15
20
25
30
LED Current
(m
A)
Duty (%)
V
IN
=3.6V, 5 LEDs
PWM Frequency=0.5kHz
0 20 40 60 80 100
0
5
10
15
20
25
30
LED Current
(m
A)
Duty (%)
V
IN
=3.6V, 5 LEDs
PWM Frequency=100KHz
Typical Performance Characteristics (Continued)
The WLED forward voltage (V
F
) is 3.45V at I
F
=20mA, unless otherwise noted.
Figure 16. LED Current vs. Duty Figure 17. LED Current vs. Duty
Time 40 µs/div Time 10ms/div
Figure 18. Powering On Figure 19. PWM Dimming
(V
IN
=3.6V, V
CTRL
=2.5V, I
LED
=20mA, 5 LEDs) (V
IN
=3.6V, V
PWM
=2.5V, f
PWM
=0.5kHz, Duty=50%, 5 LEDs)
V
IN
2V/div
V
SW
10V/div
V
OUT
10V/div
I
L
100mA/div
V
CTRL
2V/div
V
SW
10V/div
V
OUT
10V/div
I
LED
10mA/div