|
|
PDF TS19376CY5 Data sheet ( Hoja de datos )
| Número de pieza | TS19376CY5 | |
| Descripción | 1A Step-down High Brightness LED Driver | |
| Fabricantes | Taiwan Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de TS19376CY5 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
TS19376
1A Step-down High Brightness LED Driver
SOT-89-5L
Pin Definition:
1. SW
2. GND
3. DIM
4. CSN
5. VIN
General Description
The TS19376 is a continuous conduction mode inductive step-down converter, designed for driving single or
multiple series connected LED efficiently from a voltage source higher than the total LED chain voltage. The
device operates from an input supply between 8V and 32V and provides an externally adjustable output current of
up to 1A. Depending upon the supply voltage and external components, the TS19376 can provide more than 15
watts of output power. The TS19376 includes the power switch and a high-side output current sensing circuit,
which uses an external resistor to set the nominal average output current, and a dedicated DIM input accepts a
wide range of pulsed dimming. Applying a voltage of 0.3V or lower to the DIM pin turns the output off and switches
the device into a low current standby state
Features
● Wide input voltage range: 8V to 32V
● Up to 1A output current
● 5000:1 Dimming
● Single pin on/off and brightness control using PWM
● Up to 1MHz switching frequency
● Typical 5% output current accuracy
● High-Side Current Sense
● Hysteretic Control: No Compensation
● Adjustable Constant LED Current
Application
● White LED Backlighting
● High Power LED Application
● LED Lighting Equipment
Ordering Information
Part No.
Package
Packing
TS19376CY5 RMG SOT-89-5L 1Kpcs / 7” Reel
Note: “G” denotes Halogen Free Product.
Absolute Maximum Rating
Parameter
Symbol
Limit
Unit
Supply Voltage
Driver output Voltage
VIN
-0.3 to 40
V
SW
-0.3 to 40
V
Current sense input (Respect to VIN)
Logic level dimming input
CSN
DIM
+0.3 to (-6.0)
-0.3 to +6
V
V
Switch output current
ISW 1.0 A
Power Dissipation
PDMAX
1.5 W
Operation Junction Temperature Range
TJ
-40 to 125
°C
Storage Temperature
TSTG
-55 to 150
°C
Thermal Resistance from Junction to case θJC 15 °C/W
Thermal Resistance from Junction to ambient
θJA
50 °C/W
Note: θJA is measured with the PCB copper area (need connect to Exposed Pad) of approximately 1 in2(Multi-layer).
1/8 Version: A12
1 page  
TS19376
1A Step-down High Brightness LED Driver
Application Information (Continue)
Shutdown mode
Taking the DIM pin to a voltage below 0.3V will turn off the output and the supply current will fall to a low standby
level of 70µA nominal.
Capacitor selection
A low ESR capacitor should be used for input decoupling, as the ESR of this capacitor appears in series with the
supply source impedance and lowers overall efficiency. This capacitor has to supply the relatively high peak current
to the coil and smooth the current ripple on the input supply. A minimum value of 4.7uF is acceptable if the input
source is close to the device, but higher values will improve performance at lower input voltages, especially when
the source impedance is high. The input capacitor should be placed as close as possible to the IC.
For maximum stability over temperature and voltage, capacitors with X7R, X5R, or better dielectric are
recommended. Capacitors with Y5V dielectric are not suitable for decoupling in this application and should not be
used.
Inductor selection
Recommended inductor values for the TS19376 are in the range 47uH to 120uH.
Higher values of inductance are recommended at lower output current in order to minimize errors due to switching
delays, which result in increased ripple and lower efficiency. Higher values of inductance also result in a smaller
change in output current over the supply voltage range. The inductor should be mounted as close to the device as
possible with low resistance connections to the SW and VIN pins.
Diode selection
For maximum efficiency and performance, the rectifier (D1) should be a fast low capacitance Schottky diode with
low reverse leakage at the maximum operating voltage and temperature. They also provide better efficiency than
silicon diodes, due to a combination of lower forward voltage and reduced recovery time.
It is important to select parts with a peak current rating above the peak coil current and a continuous current rating
higher than the maximum output load current. It is very important to consider the reverse leakage of the diode
when operating above 85°C. Excess leakage will incr ease the power dissipation in the device and if close to the
load may create a thermal runaway condition.
The higher forward voltage and overshoot due to reverse recovery time in silicon diodes will increase the peak
voltage on the SW output. If a silicon diode is used, care should be taken to ensure that the total voltage appearing
on the SW pin including supply ripple, does not exceed the specified maximum value.
Reducing output ripple
Peak to peak ripple current in the LED(s) can be reduced, if required, by shunting a capacitor CLED across the
LED(s) as shown below:
A value of 1uF will reduce the supply ripple current by a factor three (approx.). Proportionally lower ripple can be
achieved with higher capacitor values. Note that the capacitor will not affect operating frequency or efficiency, but it
will increase start-up delay and reduce the frequency of dimming, by reducing the rate of rise of LED voltage.
By adding this capacitor the current waveform through the LED(s) changes from a triangular ramp to a more
sinusoidal version without altering the mean current value.
5/8 Version: A12
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TS19376CY5.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| TS19376CY5 | 1A Step-down High Brightness LED Driver | Taiwan Semiconductor |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |