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TS1518

Step-Up DC-DC Converter, White LED Driver

TSC Corporation 

TS1518

Step-Up DC-DC Converter, White LED Driver

Application Information (Continue)

LED Current and Dimming Control

The LED’s current is set by a resistor connected at FB pin to GND using:

100mV

I LED = RLED

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.

Dimming Control using a DC Voltage

VDC(V)

2

1.8

1.6

1.4

1.2

1

0.8

0.6

0.4

0.2

0

VFB

0

2.2

9.2

19.6

31.1

43.4

63

74

86.4

96.9

102

Iout(mA)

0

0.43

1.8

3.6

6

8.5

12.3

14.5

16.9

19

20

Dimming Control using a Filtered PWM Signal

Duty

Iout ( mA)

0%

20

20%

17.4

30%

15

40%

12.4

50%

10

60%

8

70%

6.4

80%

4.07

100%

0

PWM : 2V ; 1KHz ; Vin=3.6V

5/7

Version: B07

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