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PDF TS19751BCS Data sheet ( Hoja de datos )
| Número de pieza | TS19751BCS | |
| Descripción | Single-Stage Buck Current Control LED Driver | |
| Fabricantes | Taiwan Semiconductor | |
| Logotipo |  |
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TS19751
Taiwan Semiconductor
Single-Stage Buck Current Control LED Driver
with High Voltage MOSFET Integrated
DESCRIPTION
The TS19751 is a high performance LED driver
which accuracy constant current PWM controller with
high voltage power MOSFET integrated. It achieves
high accuracy by peak current mode. The device
provide high efficiency along with a number of key
built-in protection features while minimizing the
external component count, simplifying EMI design
and lowering the total bill of material cost. TS19751
also achieving excellent line and load regulation.
Pulse-by-pulse waveform analysis allows for a loop
response that is much faster than traditional
solutions, resulting in improved dynamic load
response. The built-in current limit function enables
optimized transformer design in universal off-line
applications over a wide input voltage range.
FEATURES
● Competitive bill of material design
● Built-in Power MOSFET
● Constant current accuracy <±3%
● VCC Over Voltage Clamp 19V
● Peak Current Mode Control
● LED Open Protection(OLP)
● Over Current Protection (OCP)
● Internal Over Thermal Protection (OTP)
● Fast start-up time < 500ms
APPLICATION
● Candle light bulb
● GU10 light bulb
SOP-8
Notes: MSL 3 (Moisture Sensitivity Level) per J-STD-020
TYPICAL APPLICATOIN CIRCUIT
Pin Definition:
1. GND
2. VCC
3. CS
4. CS
5. DRAIN
6. DRAIN
7. HV
8. GND
1
The Product is Covered by Patents and/or Pending Patent Applications
Version: B1605
1 page  
TS19751
Taiwan Semiconductor
APPLICATION INFORMATION
Start-up Current
The typical start-up current is around 45μA. The TS19751 has a built-in HV start-up circuit that avoids the need for
a start-up resistor.
Under Voltage Lockout (UVLO)
A hysteresis UVLO comparator is implemented in TS19751. The turn-on and turn-off thresholds level are fixed at
17.5V and 8V respectively. This hysteresis shown in Fig.1 ensures that the start-up capacitor will be adequate to
supply the chip during start-up. For quick start-up of the LED driver, the start-up resistor should be matched with
the start-up capacitor.
Leading-Edge Blanking (LEB)
Fig.1
Each time the power MOSFET is switched on, a turn-on spike will inevitably occur at the sense resistor. To avoid
fault trigger, a 400ns leading-edge blanking time is built in. Conventional RC filtering can therefore be omitted.
During this blanking period, the current-limit comparator is disabled and cannot switch off the gate driver.
VCC Over Voltage Clamp
VCC is clamped to 19V by an internal clamping circuit to guarantee IC normal operation.
Over Current Protection (OCP)
The TS19751 has built-in cycle by cycle over current protection function on CS pin. As the CS pin voltage is larger
than VOCP (0.5V), the gate output will be turned off immediately to avoid the driver board to be burned out.
Open load Protection (OLP)
To prevent the LED driver from being damaged, the TS19751 has an implemented OLP function. The open load
protection will shut the gate driver when minimum off time keep shorter than 4.5uS.
Over Temperature Protection (OTP)
Internal 165℃ comparator will trigger temperature protection (OTP). OTP will shut down system, until internal
temperature back to 120℃.
5
The Product is Covered by Patents and/or Pending Patent Applications
Version: B1605
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet TS19751BCS.PDF ] | |
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