TS19830CS datasheet(5/8 Pages) TSC

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TS19830CS

Taiwan Semiconductor

Version: A1704

APPLICATION INFORMATION

Start-up Current

The typical start-up current is around 45μA. Very low start-up current allows the PWM controller to increase the

value of start-up resistor and then reduce the power dissipation.

UVLO(Under Voltage Lockout)

A hysteresis UVLO comparator is implemented in TS19830. The turn-on and turn-off thresholds level are fixed at

17.5V and 8V respectively. This hysteresis shown in Fig.2 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.

LEB(Leading-Edge Blanking)

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.

OCP(Over Current Protection)

The TS19830 has built-in cycle by cycle over current protection function on CL pin. As the CL pin voltage is larger

than VOCP (0.3V), the gate output will be turned off immediately to avoid the driver board to be burned out.

OVP (Over Voltage Protection) on VCC

To prevent the LED driver from being damaged, the TS19830 has an implemented OVP function on VCC. When the

VCC voltage is higher than the VOVP (31V), the output gate driver circuit will be shut down immediately to stop the

switching of power MOSFET. The VCC pin OVP function is an auto recovery type protection. If the OVP condition

happens, the pulses will be stopped until the VCC pin voltage is down to the UVLO off level. The TS19830 is

working in an auto-recovery mode as shown in Fig. 3.

Fig. 2

Fig. 3

TS19830CS Datasheet(PDF) 5 Page - Taiwan Semiconductor Company, Ltd