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STR3A455 Datasheet(PDF) 21 Page - Sanken electric

Part # STR3A455
Description  Off-Line PWM Controllers with Integrated Power MOSFET
PDF  26 Pages
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Manufacturer  SANKEN [Sanken electric]
Direct Link  http://www.sanken-ele.co.jp/en
Logo SANKEN - Sanken electric

STR3A455 Datasheet(HTML) 21 Page - Sanken electric

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STR3A400 Series
STR3A400-DSE Rev.2.1
SANKEN ELECTRIC CO.,LTD.
21
Sept. 18, 2015
http://www.sanken-ele.co.jp/en/
© SANKEN ELECTRIC CO.,LTD. 2014
(7) Thermal Considerations
Because the power MOSFET has a positive thermal
coefficient of RDS(ON), consider it in thermal design.
Since the copper area under the IC and the D/ST pin
trace act as a heatsink, its traces should be as wide as
possible.
C1
C5
R1
D1
D2
R2
C2
T1
C51
D
P
S
PC1
C3
ROCP
C4
1
2
3
4
D/ST
VCC
NC
S/OCP
FB/OLP
GND
8
7
5
STR3A400
U1
A
DST
CY
D51
(1) Main trace should be wide
trace and small loop
(6) Main trace of secondary side should
be wide trace and small loop
(7)Trace of D/ST pin should be
wide for heat release
(2) Control GND trace should be connected at a
single point as close to the ROCP as possible
(3) Loop of the power
supply should be small
(4)ROCP Should be as close to S/OCP pin as
possible.
(5)The components connected to
FB/OLP pin should be as close
to FB/OLP pin as possible
6
D/ST
D/ST D/ST
Figure 10-5 Peripheral circuit example around the IC



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