TS19751ACS

Taiwan Semiconductor

5

Version: C1801

The Product is Covered by Patents and/or Pending Patent Applications

APPLICATION INFORMATION

Start-up Current

The typical start-up current is around 45

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

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.

17.5V

8V

Leading-Edge Blanking (LEB)

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

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℃.

Fig.1