Datasheet

TPS92311
D
3
1A 100V
T1
2200 pF
R
2
66 kQ
R
3
11 kQ
1A 600V
R
4
20Q
D
2
BAV20
35V*
D
1
0.5A 600V
R
AC
C
AC
47 nF
C
IN
0.1 PF
L
1
3.3 mH
VR1
0.5A
250V
ZCD
R1b
100k
1.52Q
C
ZCD
15p
LED+
LED-
6 ± 7
LED
90-135VAC
L
P
L
S
L
AUX
C
OUTa
10 PF
R1a
100k
C
OUTb
470 PF
C
1
0.1PF
SWSW
GND
ZCD
VIN
SW
ISNS
SW
GND
COMP
MODE1
DLY
MODE2
NC
NC
NC
3.3 F
CUSU4148
10 F
6.34k
SCR*
*Optional for short circuit protection
6k*
N
P
: N
S
: N
AUX
= 3.8 : 1 : 1
D
ZCD
C
VCC
C
COMP
R
ISNS
R
DLY
CY1
22: / 1W
TPS92311
SNVS811B –MAY 2012–REVISED MAY 2013 www.ti.com
PCB Layout Considerations
The performance of any switching power supplies depend as much upon the layout of the PCB as the
component selection. Good layout practices are important when constructing the PCB. The layout must be as
neat and compact as possible, and all external components must be as close as possible to their associated
pins. High current return paths and signal return paths must be separated and connect together at single ground
point. All high current connections must be as short and direct as possible with thick traces. The SW pin of the
internal MOSFET should be connected close to the transformer pin with short and thick trace to reduce potential
electro-magnetic interference. For off-line applications, one more consideration is the safety requirements. The
clearance and creepage to high voltage traces must be complied to all applicable safety regulations.
Figure 25. Isolated topology schematic
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