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

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

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.

S

P

S

P

O_avg

R

K

2

2.5

N

N

I

×

×

×

=

Pin Detail Description

RT

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

2250

R

T

T

S)

S(

=

µ

225

R

T

T

S)

STR(

=

µ

DMG

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

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

2

2

1

A

S

O_STR

R

R

R

3

N

N

V

+

×

×

=

2

2

1

OVPS

A

S

O_OVP

R

R

R

V

N

N

V

+

×

×

=