STR-A6131 Datasheet, PDF (12/25 Pages) Allegro MicroSystems – 120 V/12 or 16 W Flyback Switching Regulators

STR-A6100 Series
6. Typical Application Circuit
 The PCB traces of D pins should be as wide as possible, in order to enhance thermal dissipation.
 In applications having a power supply specified such that V_DS has large transient surge voltages, a clamp snubber
circuit of a capacitor-resistor-diode (CRD) combination should be added on the primary winding P, or a damper
snubber circuit of a capacitor (C) or a resistor-capacitor (RC) combination should be added between the D pin and
the S/OCP pin.
 As shown in Figure 6-2, STR-A6153E does not need diode connected to ST pin.
BR1
VAC
C1
CRD clamp snubber
C6
DST
L1
T1 ^D51
R1
P
D1
C51
S
R54
R51
PC1
R55
R52
VOUT
C53
C（RC）
Damper snubber
87
5
D D NC ST
C5
U1
STR-A61××
STR-A61××M
S/OCP VCC GND FB/OLP
D2 _R2
C2
D
1234
CY
ROCP
DZ1
C3 ^PC1
C4
C52 R53
U51
R56
GND
Figure 6-1 Typical application circuit (STR-A61××/ STR-A61××M)
BR1
VAC
C1
CRD clamp snubber
T1 ^D51
C6
R1
P
D1
C51
S
87
5
D D NC ST
C5
U1
STR-A6153E
D2 _R2
C2
D
S/OCP VCC GND FB/OLP
C（RC）
Damper snubber
1234
CY
ROCP
DZ1
C3 ^PC1
C4
L1
R54
R51
PC1
R55
R52
C52 R53
U51
R56
VOUT
C53
GND
Figure 6-2 Typical application circuit (STR-A6153E)
STR-A6100 - DS Rev.2.0
SANKEN ELECTRIC CO.,LTD.
12
Dec. 25, 2013