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PDF TS1520 Data sheet ( Hoja de datos )
| Número de pieza | TS1520 | |
| Descripción | White LED Driver | |
| Fabricantes | Taiwan Semiconductor Company | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TS1520 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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TS1520
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 TS1520 is a step-up DC-DC converter; operates as current source to drive up to 18 white LEDs in parallel/series
configuration. 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 TS1520 switches at a fixed frequency of 700KHz, 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 TS1520 can drive up to 18 white LEDs form 4.5V supply. The wide input voltage range
from 2.7V to7V is ideal for portable (5V) applications 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
50KHz to the CTRL pin. TS1520 has integrated 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
● 2.7V to 7V input range
● <1uA shutdown current
● High Efficiency
● Drives up to 3S2P to 3S6P White LEDs
(VIN at 3.5V to 5V)
● Over Voltage Protection 30V
Application
● Cellular Phones
● Digital Still Cameras
● Portable Electronics
● LCD Display Module
● White LED Backlighting
● PDAs, GPS terminals
Ordering Information
Typical Application Circuit
Part No.
TS1520CX5 RF
Package
SOT-25
Packing
3Kpcs / 7” Reel
1/12 Version: B07
1 page  
TS1520
Step-Up DC-DC Converter, Whwwitwe.DaLtaEShDeet4DU.croivmer
Application Information (Continue)
Capacitor Selection
Choose low ESR capacitors for the output to minimize output voltage ripple. Multilayer capacitors are a good choice for
this as well. A 47uF capacitor is sufficient for most applications. For additional bypassing, a 100nF ceramic capacitor
can be used to shunt high frequency ripple on the input. The input bypass capacitor CIN, as shown in Figure 1, must be
placed close to the IC. This will reduce copper trace resistance which affects input voltage ripple of the IC. For
additional input voltage filtering, a 100nF bypass capacitor can be placed in parallel with CIN to shunt any high
frequency noise to ground. The output capacitor, COUT, should also be placed close to the IC. Any copper trace
connections for the COUT capacitor can increase the series resistance, which directly effect output voltage ripple.
The feedback network, resister R2 should be kept close to the FB pin to minimize copper trace connections that can
inject noise into the system. The ground connection for the feedback resistor network should connect directly to an
analog ground plane. The analog ground plane should tie directly to the GND pin. If no analog ground plane is
available, the ground connection for the feedback network should tie directly to the GND pin. Trace connections made
to the inductor and Schottky diode should be minimized to reduce power dissipation and increase overall efficiency.
Typical Performance Characteristics
5/12 Version: B07
5 Page 
TS1520
Step-Up DC-DC Converter, Whwwitwe.DaLtaEShDeet4DU.croivmer
SOT-25 Mechanical Drawing
DIM
A+A1
B
C
D
E
E
H
L
Ө1
S1
SOT-25 DIMENSION
MILLIMETERS
INCHES
MIN MAX MIN MAX.
0.09
1.25
0.0354 0.0492
0.30
0.50
0.0118 0.0197
0.09
0.25
0.0035 0.0098
2.70
3.10
0.1063 0.1220
1.40
1.80
0.0551 0.0709
1.90 BSC
0.0748 BSC
2.40
3.00 0.09449 0.1181
0.35 BSC
0.0138 BSC
0º 10º 0º 10º
0.95 BSC
0.0374 BSC
11/12
Version: B07
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TS1520.PDF ] | |
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