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

No de pièce TS19704CSRLG
Description  Single-Stage Primary-Side Control with High PFC LED Driver
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Fabricant  TSC [Taiwan Semiconductor Company, Ltd]
Site Internet  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS19704CSRLG Fiches technique(HTML) 4 Page - Taiwan Semiconductor Company, Ltd

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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.
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
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.
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
+
×
×
=


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