TS19704CSRLG datasheet(4/7 Pages) TSC

4 / 7 page

TS19704

Single-Stage Primary-Side Control

with High PFC LED Driver

4/7

Version: C12

Application Information

Function Description

The TS19704 is a constant current Flyback controller with primary side control and PFC function for LED lighting

applications. Which controller is DCM operation with constant on time based regulator design. In other to achieve

high power factor and good EMI performance. This control algorithm fix ICS_PK in wide range variation of Line

voltage. We can design transformer critically by ICS(Limit) function. The TS19704 are built-in functions of VCC over

voltage protection, open LED protection, short LED protection, over temperature protection, and primary side

current limit, and gate clamp within. The TS19704 sense switch current from CS voltage Multiplier by TDIS to

provide the integral result(VINT). The avarge VINT is finally 2.5V(Vref) by the system close loop feedback. The

avarge output current can express as below.

O_avg

2.5

Pin Detail Description

Switch timer(Ts) and Start up timer(Tstr) setup Tstr = 10Ts:

2250

225

STR(

DMG

The Output voltage is reflected by the auxiliary winding(NAUX) voltage of Flyback transformer, the DMG pin can

sense output information to depart from start up voltage(VO_STR) and protection voltage(VO_OVP).

When DMG sense voltage under VO_STR, the circuit will work on short circuit protection, FSTR=1/Tstr,

VCS_PK=0.35V, When DMG sense voltage over VO_OVP, the circuit will work on over voltage protection, it will latch

out off until VCC under VCC_OFF.

O_STR

OVPS

O_OVP

TS19704CSRLG Datasheet(PDF) 4 Page - Taiwan Semiconductor Company, Ltd