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TS19371CX6RF Arkusz danych(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

Numer części TS19371CX6RF
Szczegółowy opis  Boost (Step-up) WLED Driver with OVP
Download  8 Pages
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Producent  TSC [Taiwan Semiconductor Company, Ltd]
Strona internetowa  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS19371CX6RF Arkusz danych(HTML) 6 Page - Taiwan Semiconductor Company, Ltd

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TS19371
Boost (Step-up) WLED Driver with OVP
6/8
Version: H14
Application Information (Continue)
LED Dimming Control
There are some different types of dimming control circuits:
1. Using a PWM Signal to SHDN Pin
With the PWM signal applied to the SHDN pin, the TS19371 is turned on or off by the PWM signal. The LEDs
operate at either zero or full current. The average LED current increases proportionally with the duty cycle of the
PWM signal. A 0% duty cycle will turn off the TS19371 and corresponds to zero LED current. A 100% duty cycle
corresponds to full current. The typical frequency range of the PWM signal is 1kHz to 10kHz.
The magnitude of the PWM signal should be higher than the minimum SHDN voltage high.
For some applications, the preferred method of brightness control is a variable DC voltage to adjust the LED
current. The dimming control using a DC voltage is shown in below figure. As the DC voltage increases, the voltage
drop on R2 increases and the voltage drop on R1 decreases. Thus, the LED current decreases. The selection of
R2 and R3 will make the current from the variable DC source much smaller than the LED current and much larger
than the FB pin bias current. For VDC range from 0V to 2V, the selection of resistors in Figure 4 gives dimming
control of LED current from 0mA to 20mA.
Dimming Control using a DC Voltage
2. Using a Filtered PWM Signal
The filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable DC
voltage source in dimming control. The circuit is shown as follow:
Dimming Control using a Filtered PWM Signal
3. Using Control pin for dimming
The PWM signal can be considered as TTL signal to control pin to change the power on/off time.
VDC(V)
VFB
IOUT(mA)
2
0
0
1.8
2.2
0.43
1.6
9.2
1.8
1.4
19.6
3.6
1.2
31.1
6
1
43.4
8.5
0.8
63
12.3
0.6
74
14.5
0.4
86.4
16.9
0.2
96.9
19
0
102
20
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


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