TS1518CX5 Taiwan Semiconductor, TS1518CX5 Datasheet - Page 5

• Manufacturer Part Number: TS1518CX5
• Description: LED Lighting Drivers White LED driver
• Manufacturer: Taiwan Semiconductor

Specifications of TS1518CX5

• Rohs: yes

Application Information (Continue)
LED Current and Dimming Control
The LED’s current is set by a resistor connected at FB pin to GND using:
The maximum LED current set initially can be reduced by pulse width modulating the CTRL voltage from 0.4V to 1.8V.
A better approach is to adjust the feedback voltage for dimming control. Either a DC level signal or a filtered PWM
signal can be used to control the LED current as illustrated in below figures respectively. Using the above different
scheme, the LED current can be controlled from 0% to 100% to its maximum value.
I
LED
Dimming Control using a Filtered PWM Signal
=
Dimming Control using a DC Voltage
100
R
LED
mV
Step-Up DC-DC Converter, White LED Driver
5/7
PWM : 2V ; 1KHz ; Vin=3.6V
VDC(V)
1.8
1.6
1.4
1.2
0.8
0.6
0.4
0.2
2
1
0
100%
Duty
20%
30%
40%
50%
60%
70%
80%
0%
VFB
19.6
31.1
43.4
86.4
96.9
102
2.2
9.2
63
74
0
Iout ( mA)
Iout(mA)
17.4
12.4
4.07
6.4
0.43
12.3
14.5
16.9
20
15
10
1.8
3.6
8.5
8
0
19
20
0
6
TS1518
Version: B07