Auxiliary Switch Diodes for Snubber
SARS01, SARS02, SARS05, SARS10
Description
The SARS
(1)
is an auxiliary switch diode especially
designed for snubber circuits, which are used in the
primary sides of flyback switched-mode power supplies.
Being capable of reducing the ringing voltage
generated at power MOSFET turn-off, the
SARS-incorporated snubber circuits allow better cross
regulation of multiple outputs.
The SARS can also improve power supply efficiency
by partially transferring such ringing voltage into the
secondary side of a power supply unit.
Data Sheet
Package
SARS01 (Axial φ 2.7 / φ 0.60)
(1)
(2)
SARS02 (Axial φ 4 / φ 0.78)
(1)
(2)
SARS05 (SJP 4.5 mm × 2.6 mm)
Features
● Improves Cross Regulation
● Reduces Noise
● Improves Efficiency
(1)
(2)
Applications
For switched-mode power supplies (SMPS) with
flyback topology such as:
● White Goods
● Adaptor
● Industrial Equipment
(1)
(2)
(1) Cathode
(2) Anode
SARS10 (TO220F-2L)
(1)
(2)
Clamp snubber
Typical Application
C
S
R
S1
(1)
(2) (1) Cathode side
(2) Anode
R
S2
SARS
Not to scale
Selection Guide
Controller
AC/DC converter IC
R
S2
Part
Number
SARS01
I
F(AV)
1.2 A
1.5 A
1A
0.3 A
V
F
(max.)
0.92 V
0.92 V
1.05 V
13 V
Power Supply
Output Power,
P
O
*
up to 50 W
up to 100 W
up to 50 W
up to 300 W
External
Resistor
SARS02
SARS05
Built-in 22 Ω SARS10
* P
O
represents a reference value for product selection. When
using the product, you should monitor temperature rises during
actual operation.
(1)
The “SARS” represents any one of the SARSxx
devices listed in this document.
1
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
SARS01, SARS02, SARS05, SARS10
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
Absolute Maximum Ratings --------------------------------------------------------------------------------- 3
Electrical Characteristics ------------------------------------------------------------------------------------ 4
SARS01 Rating and Characteristic Curves--------------------------------------------------------------- 5
SARS02 Rating and Characteristic Curves--------------------------------------------------------------- 6
SARS05 Rating and Characteristic Curves--------------------------------------------------------------- 8
SARS10 Rating and Characteristic Curves--------------------------------------------------------------- 9
Physical Dimensions and Marking Diagram ----------------------------------------------------------- 11
Operating Comparison of Clamp Snubber Circuit --------------------------------------------------- 13
Power Dissipation and Junction Temperature Calculation ----------------------------------------- 14
Parameter Setting of Snubber Circuit using SARS --------------------------------------------------- 15
Reference Design of Power Supply ----------------------------------------------------------------------- 16
Important Notes ---------------------------------------------------------------------------------------------- 18
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
2
SARS01, SARS02, SARS05, SARS10
Absolute Maximum Ratings
Unless otherwise specified, T
A
= 25 °C, only the SARS10 incorporates a resistor (22 Ω).
Parameter
Symbol
Conditions
Rating
Transient Peak Reverse Voltage
Peak Repetitive Reverse Voltage
V
RSM
V
RM
800
800
1.2
Average Forward Current
(2)
Unit
V
V
Remarks
SARS01
A
SARS02
SARS05
SARS10
SARS01
SARS02
A
SARS05
SARS10
SARS01
A
2
s
SARS02
SARS05
SARS10
°C
SARS01/02/05
SARS10
SARS01/02/05
SARS10
SARS10
I
F(AV)
1.2
1.0
0.3
Half cycle sine
wave, positive side,
10 ms, 1 shot
1 ms, square pulse,
1 shot
110
100
30
1.5
60.5
Surge Forward Current
I
FSM
I
2
t Limiting Value
I
2
t
1 ms ≤ t ≤ 10 ms
50
4.5
—
−40 to 150
−20 to 125
−40 to 150
−20 to 125
3 .0
Junction Temperature
T
J
Storage Temperature
Power Dissipation
T
STG
P
°C
W
(2)
See the derating curves of each product.
3
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
SARS01, SARS02, SARS05, SARS10
Electrical Characteristics
Unless otherwise specified, T
A
= 25 °C, only the SARS10 incorporates a resistor (22 Ω).
Parameter
Symbol
Conditions
Min.
Typ. Max.
I
F
= 1.2 A
Forward Voltage Drop
V
F
I
F
= 1.5 A
I
F
= 1.0 A
I
F
= 0.5 A
—
—
—
—
—
Reverse Leakage Current
I
R
V
R
= V
RM
—
—
—
Reverse Leakage Current under
High Temperature
H∙I
R
V
R
= V
RM
,
T
J
= 100 °C
V
R
= V
RM
,
T
J
= 125 °C
I
F
= I
RP
= 100 mA,
T
J
= 25 °C,
90% recovery point
—
—
2
Reverse Recovery Time
t
rr
2
2
1
—
Thermal Resistance
R
th(J-L)
(3)
Unit
Remarks
SARS01
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
0.92
0.92
1.05
13
10
10
5
10
50
µA
100
18
18
19
9
20
15
20
15
°C/W
°C/W
µs
µA
V
SARS02
SARS05
SARS10
SARS01
SARS02
SARS05
SARS10
SARS01/02/05
SARS10
SARS01
SARS02
SARS05
SARS10
SARS01
SARS02
SARS05
SARS10
—
—
—
R
th(J-C)
(4)
(3)
(4)
R
th(J-L)
is thermal resistance between junction and lead.
R
th(J-c)
is thermal resistance between junction and case.
4
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
SARS01, SARS02, SARS05, SARS10
SARS01 Rating and Characteristic Curves
1.2
0.4
Forward Power Dissipation, P
F
(W)
1.0
Reverse Power Dissipation, P
R
(W)
0.3
0.8
0.6
DC
0.2
0.4
0.1
0.2
0.0
0
0.2
0.4
0.6
0.8
1
1.2
0
0
200
400
Sine wave
600
800
Average Forward Current, I
F(AV)
(A)
Figure 1.
I
F(AV)
vs. P
F
Power Dissipation Curves
(T
J
= 150 °C)
Figure 2.
Reverse Voltage, V
R
(V)
V
R
vs. P
R
Power Dissipation Curves
(T
J
= 150 °C)
1.2
1.2
Average Forward Current, I
F(AV)
(A)
DC
Average Forward Current, I
F(AV)
(A)
1.0
1.0
Sine wave
0.8
0.8
DC
0.6
0.6
0.4
0.4
0.2
0.2
0.0
100
110
120
130
140
150
0.0
100
110
120
130
140
150
Lead Temperature, T
L
(°C)
Figure 3. T
L
vs. I
F(AV)
Derating Curves
(V
R
= 0 V, T
J
= 150 °C)
Lead Temperature, T
L
(°C)
Figure 4. T
L
vs. I
F(AV)
Derating Curves
(V
R
= 800 V, T
J
= 150 °C)
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
5
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