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PDF TS1518 Data sheet ( Hoja de datos )
| Número de pieza | TS1518 | |
| Descripción | White LED Driver | |
| Fabricantes | Taiwan Semiconductor Company | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TS1518 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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TS1518
Step-Up DC-DC Converter, Whwwitwe.DaLtaEShDeet4DU.croivmer
SOT-25
Pin Definition:
1. SW
2. Ground
3. Feedback
4. CTRL
5. Input
General Description
The TS1518 is a step-up DC-DC converter; operates as current source to drive up to 6 white LEDs(VIN at 3.0V) or 8
LEDs(VIN at 3.5V) or 9 LEDs(VIN at 3.5V) in series. Series connecting of the LEDs provides identical LED currents
resulting in uniform brightness and eliminating the need for ballast resistors. The light intensity of these LEDs is
proportional to the current passing through them. The TS1518 switches at a fixed frequency of ~930KHz, allowing the
use of tiny, low profile inductors and capacitors to minimize footprint and cost in space consideration applications for
cellular phone backlighting or other hand held equipment. The TS1518 can drive up to 9 white LEDs from a single Li-
Ion battery. The wide input voltage range from 2.7V to 7V is ideal for portable with higher conversion efficiency. To
control LED brightness, the LED current can be pulsed by applying a PWM (pulse width modulated) signal with a
frequency range of 100Hz to 1KHz to the CTRL pin.
TS1518 has integrated Latched Over Voltage Protection that prevents damage to the device in case of a high
impedance output due to faulty LED or open circuit caused by abnormal conditions.
Features
● Built-in Internal Switch
● PWM dimming control 100Hz to 1KHz
● Analog dimming control
● 2.7V to 7V input range
● <1uA shutdown current
● Internal Soft Start
● Drives up to 9 White LEDs (VIN at 3.5V)
● Over Voltage Protection 34V
● 100mV Low Reference Voltage
Application
● Cellular Phones
● Digital Still Cameras
● Portable Electronics
● LCD Display Module
● White LED Backlighting
● PDAs, GPS terminals
Ordering Information
Part No.
TS1518CX5 RF
Package
SOT-25
Packing
3Kpcs / 7” Reel
Typical Application Circuit
1/7 Version: B07
1 page  
TS1518
Step-Up DC-DC Converter, Whwwitwe.DaLtaEShDeet4DU.croivmer
Application Information (Continue)
LED Current and Dimming Control
The LED’s current is set by a resistor connected at FB pin to GND using:
I LED
=
100mV
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
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet TS1518.PDF ] | |
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