Auxiliary Switch Diodes for Snubber
SARS01, SARS02, SARS05, SARS10
Data Sheet
Package
Description
(1)
SARS01 (Axial φ 2.7 / φ 0.60)
The SARS 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.
(1)
(2)
SARS02 (Axial φ 4 / φ 0.78)
(2)
ns
(1)
es
ig
SARS05 (SJP 4.5 mm × 2.6 mm)
Features
(1)
(2)
ew
D
● Improves Cross Regulation
● Reduces Noise
● Improves Efficiency
Applications
(1)
● White Goods
● Adaptor
● Industrial Equipment
rN
For switched-mode power supplies (SMPS) with
flyback topology such as:
(2) (1) Cathode
(2) Anode
fo
SARS10 (TO220F-2L)
d
(1)
(1)
m
RS1
(2) (1) Cathode side
(2) Anode
m
CS
en
Clamp snubber
(2)
de
Typical Application
RS2
Not to scale
ec
o
SARS
Selection Guide
R
Controller
N
ot
AC/DC converter IC
RS2
External
Resistor
Part
Number
IF(AV)
VF
(max.)
Power Supply
Output Power,
PO*
SARS01
1.2 A
0.92 V
up to 50 W
SARS02
1.5 A
0.92 V
up to 100 W
SARS05
1A
1.05 V
up to 50 W
0.3 A
13 V
up to 300 W
Built-in 22 Ω SARS10
* PO 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.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
1
SARS01, SARS02, SARS05, SARS10
Contents
Description ------------------------------------------------------------------------------------------------------ 1
Contents --------------------------------------------------------------------------------------------------------- 2
Absolute Maximum Ratings --------------------------------------------------------------------------------- 3
Electrical Characteristics ------------------------------------------------------------------------------------ 4
SARS01 Rating and Characteristic Curves--------------------------------------------------------------- 5
ns
SARS02 Rating and Characteristic Curves--------------------------------------------------------------- 6
SARS05 Rating and Characteristic Curves--------------------------------------------------------------- 8
es
ig
SARS10 Rating and Characteristic Curves--------------------------------------------------------------- 9
Physical Dimensions and Marking Diagram ----------------------------------------------------------- 11
D
Operating Comparison of Clamp Snubber Circuit --------------------------------------------------- 13
Power Dissipation and Junction Temperature Calculation ----------------------------------------- 14
ew
Parameter Setting of Snubber Circuit using SARS --------------------------------------------------- 15
rN
Reference Design of Power Supply ----------------------------------------------------------------------- 16
N
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R
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m
m
en
de
d
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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, TA = 25 °C, only the SARS10 incorporates a resistor (22 Ω).
Parameter
Symbol
Conditions
Rating
Unit
Transient Peak Reverse Voltage
VRSM
800
V
Peak Repetitive Reverse Voltage
VRM
800
V
1.2
1.2
IF(AV)
1.0
0.3
IFSM
30
TJ
Storage Temperature
TSTG
D
A
SARS02
SARS05
SARS10
60.5
SARS01
ew
P
SARS01
4.5
A2s
—
−40 to 150
−20 to 125
−40 to 150
−20 to 125
3 .0
SARS02
SARS05
SARS10
°C
°C
W
SARS01/02/05
SARS10
SARS01/02/05
SARS10
SARS10
N
ot
R
ec
o
m
m
Power Dissipation
SARS05
1.5
50
rN
en
de
d
Junction Temperature
1 ms ≤ t ≤ 10 ms
fo
I2t
SARS02
SARS10
100
1 ms, square pulse,
1 shot
I2t Limiting Value
A
es
ig
Surge Forward Current
110
Half cycle sine
wave, positive side,
10 ms, 1 shot
SARS01
ns
Average Forward Current(2)
Remarks
(2)
See the derating curves of each product.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
3
SARS01, SARS02, SARS05, SARS10
Electrical Characteristics
Unless otherwise specified, TA = 25 °C, only the SARS10 incorporates a resistor (22 Ω).
Parameter
Symbol
Conditions
Min.
Typ. Max.
Reverse Leakage Current under
High Temperature
IF = 1.5 A
—
—
0.92
IF = 1.0 A
—
—
1.05
IF = 0.5 A
—
—
13
SARS10
—
—
10
SARS01
—
—
10
—
—
5
—
—
—
—
VR = VRM
VR = VRM,
TJ = 100 °C
VR = VRM,
TJ = 125 °C
H∙IR
—
IF = IRP = 100 mA,
TJ = 25 °C,
90% recovery point
de
(4)
V
—
SARS02
SARS05
µA
SARS02
10
50
SARS05
SARS10
SARS01/02/05
µA
100
SARS10
SARS01
—
18
2
—
18
2
—
19
1
—
9
SARS10
—
—
20
SARS01
—
—
15
—
—
20
—
—
15
µs
°C/W
SARS02
SARS05
SARS02
SARS05
°C/W
SARS10
N
ot
R
ec
o
m
m
en
Rth(J-C)
d
(3)
Rth(J-L)
Thermal Resistance
SARS01
2
rN
trr
fo
Reverse Recovery Time
0.92
ns
IR
—
es
ig
Reverse Leakage Current
—
D
VF
Remarks
IF = 1.2 A
ew
Forward Voltage Drop
Unit
(3)
(4)
Rth(J-L) is thermal resistance between junction and lead.
Rth(J-c) is thermal resistance between junction and case.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
4
SARS01, SARS02, SARS05, SARS10
SARS01 Rating and Characteristic Curves
0.4
0.6
DC
0.4
0.2
0.2
ns
0.8
0.3
es
ig
1.0
0.1
D
Reverse Power Dissipation, PR (W)
Forward Power Dissipation, PF (W)
1.2
0
0.0
0.2
0.4
0.6
0.8
1
0
1.2
400
600
800
Reverse Voltage, VR (V)
rN
Average Forward Current, IF(AV) (A)
IF(AV) vs. PF Power Dissipation Curves
(TJ = 150 °C)
Figure 2.
VR vs. PR Power Dissipation Curves
(TJ = 150 °C)
fo
Figure 1.
200
ew
0
Sine wave
1.2
en
DC
m
m
0.8
ec
o
0.6
R
0.4
0.2
N
0.0
100
110
Average Forward Current, IF(AV) (A)
de
1.0
ot
Average Forward Current, IF(AV) (A)
d
1.2
1.0
Sine wave
0.8
DC
0.6
0.4
0.2
0.0
120
130
140
150
100
Lead Temperature, TL (°C)
Figure 3. TL vs. IF(AV) Derating Curves
(VR = 0 V, TJ = 150 °C)
110
120
130
140
150
Lead Temperature, TL (°C)
Figure 4. TL vs. IF(AV) Derating Curves
(VR = 800 V, TJ = 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
SARS01, SARS02, SARS05, SARS10
1E-03
TA = 150 °C
0.1
TA = 25 °C
TA = 100 °C
0.01
TA = 100 °C
1E-06
1E-07
TA = 25 °C
1E-08
1E-09
0.001
0.0
0.5
1.0
0
1.5
Forward Voltage, VF (V)
200
400
600
800
ew
Reverse Voltage, VR (V)
VF vs. IF Typical Characteristics
Figure 6.
VR vs. IR Typical Characteristics
d
SARS02 Rating and Characteristic Curves
0.5
m
0.8
ec
o
0.6
DC
ot
R
0.4
0.0
0.0
Forward Power Dissipation, PR (W)
de
m
en
1.0
N
Forward Power Dissipation, PF (W)
1.2
0.2
fo
rN
Figure 5.
ns
1
1E-05
es
ig
Reverse Current, IR (A)
10
Forward Current, IF (A)
TA = 150 °C
1E-04
D
100
0.4
0.3
0.2
0.1
Sine wave
0
0.2
0.4
0.6
0.8
1.0
1.2
0
Figure 7.
IF(AV) vs. PF Power Dissipation Curves
(TJ = 150 °C)
200
400
600
800
Reverse Voltage, VR (V)
Average Forward Current, IF(AV) (A)
Figure 8.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
VR vs. PR Power Dissipation Curves
(TJ = 150 °C)
6
1.2
1.2
1.0
1.0
0.4
0.2
0.0
DC
0.6
0.4
0.2
0.0
100
110
120
130
140
150
100
120
130
140
150
Lead Temperature, TL (°C)
Figure 10. TL vs. IF(AV) Derating Curves
(VR = 800 V, TJ = 150 °C)
fo
rN
Figure 9. TL vs. IF(AV) Derating Curves
(VR = 0 V, TJ = 150 °C)
1E-03
m
TA = 150 °C
m
1
en
10
TA = 25 °C
ec
o
0.1
TA = 100 °C
ot
N
0.0
Figure 11.
0.5
TA = 150 °C
1E-04
1E-05
1E-06
TA = 100 °C
TA = 25 °C
1E-07
1E-08
R
0.01
Reverse Current, IR (A)
de
d
100
Forward Current, IF (A)
110
ew
Lead Temperature, TL (°C)
0.001
ns
0.6
Sine wave
0.8
es
ig
DC
0.8
D
Average Forward Current, IF(AV) (A)
Average Forward Current, IF(AV) (A)
SARS01, SARS02, SARS05, SARS10
1E-09
1.0
1.5
0
Forward Voltage, VF (V)
VF vs. IF Typical Characteristics
200
400
600
800
Reverse Voltage, VR(V)
Figure 12.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
VR vs. IR Typical Characteristics
7
SARS01, SARS02, SARS05, SARS10
SARS05 Rating and Characteristic Curves
1.4
0.4
0.6
0.4
DC
0.2
0.2
ns
0.8
0.3
0.1
0
0.0
0.2
0.4
0.6
0.8
ew
0.0
0
1.0
400
600
800
rN
IF(AV) vs. PF Power Dissipation Curves
(TJ = 150 °C)
Figure 14.
VR vs. PR Power Dissipation Curves
(TJ = 150 °C)
fo
Figure 13.
200
Sine wave
Reverse Voltage, VR (V)
Average Forward Current, IF(AV) (A)
d
1.0
en
0.8
m
0.7
m
0.6
DC
ec
o
0.5
0.4
R
0.3
ot
0.2
N
0.1
0.0
100
110
120
130
140
150
1.0
0.9
Average Forward Current, IF(AV) (A)
de
0.9
Average Forward Current, IF(AV) (A)
es
ig
1.0
D
Forward Power Dissipation, PR (W)
Forward Power Dissipation, PF (W)
1.2
0.8
0.7
0.6
Sine wave
0.5
DC
0.4
0.3
0.2
0.1
0.0
100
Lead Temperature, TL ( °C)
Figure 15. TL vs. IF(AV) Derating Curves
(VR = 0 V, TJ = 150 °C)
110
120
130
140
150
Lead Temperature, TL (°C)
Figure 16. TL vs. IF(AV) Derating Curves
(VR = 800 V, TJ = 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
8
SARS01, SARS02, SARS05, SARS10
1E-04
100
TA = 150 °C
1E-05
1
TA = 25 °C
0.1
TA = 100 °C
0.01
1E-06
1E-07
TA = 25 °C
1E-08
1E-09
0.001
0.5
1.0
1.5
0
d
de
ot
N
0.0
0.0
VR vs. IR Typical Characteristics
0.08
0.06
0.05
0.04
0.03
0.02
0.01
0
0.1
0.2
0.3
0
100 200 300 400 500 600 700 800
Average Forward Current, IF(AV) (A)
Figure 19.
800
0.07
Forward Power Dissipation, PR (W)
en
m
m
ec
o
DC
R
1.0
600
fo
rN
Figure 18.
SARS10 Rating and Characteristic Curves
2.0
400
Reverse Voltage, VR(V)
VF vs. IF Typical Characteristics
3.0
200
ew
Forward Voltage, VF (V)
Figure 17.
D
1E-10
0.0
Forward Power Dissipation, PF (W)
TA = 100 °C
ns
TA = 150 °C
es
ig
Reverse Current, IR (A)
Forward Current, IF (A)
10
IF(AV) vs. PF Power Dissipation Curves
(TJ = 125 °C)
Reverse Voltage, VR (V)
Figure 20.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
VR vs. PR Power Dissipation Curve
(TJ = 125 °C)
9
SARS01, SARS02, SARS05, SARS10
1
DC
0.1
0.1
0.01
TA = 150 °C
ns
0.2
es
ig
Forward Current, IF (A)
Average Forward Current, IF(AV) (A)
0.3
TA = 100 °C
TA = 25 °C
0.0
50
60
70
80
90
0
100 110 120 130
5
10
15
20
Forward Voltage, VF (V)
ew
Case Temperature, TC (°C)
Figure 22.
VF vs. IF Typical Characteristics
fo
rN
Figure 21. TC vs. IF(AV) Derating Curves
(VR = 800 V, TJ = 125 °C)
1E-04
d
TA = 150 °C
en
de
1E-05
ec
o
TA = 25 °C
m
TA = 100 °C
1E-07
m
1E-06
1E-08
R
Reverse Current, IR (A)
D
0.001
ot
1E-09
1E-10
N
0
Figure 23.
200
400
600
800
Reverse Voltage, VR(V)
VR vs. IR Typical Characteristics
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
10
SARS01, SARS02, SARS05, SARS10
Physical Dimensions and Marking Diagrams
● SARS01
Axial (φ 2.7 / φ 0.6)
Polarity Marking (Cathode band)
AR
S1
Device Code of SARS01
ns
YM
D
D
es
ig
Lot Number:
Y is the last digit of the year of manufacture (0 to 9)
M is the month of the year (1 to 9, O, N, or D)
D is a period of days:
“・” is the first 10 days of the month (1st to 10th)
“・・” is the second 10 days of the month (11th to 20th)
“・・・” is the last 10–11 days of the month (21st to 31st)
d
fo
rN
ew
NOTES:
- Dimensions in millimeters
- Bare lead: Pb-free (RoHS compliant)
- When soldering the products, be sure to minimize the working time, within the following limits:
Flow: 260 ± 5 °C / 10 ± 1 s, 2 times
Soldering Iron: 380 ± 10 °C / 3.5 ± 0.5 s, 1 time (Soldering should be at a distance of at least 1.5 mm from the
body of the products.)
Polarity Marking (Cathode band)
SARS2
SARS2
YM D
YM D
Device Code of SARS02
Lot Number:
Y is the last digit of the year of manufacture (0 to 9)
M is the month of the year (1 to 9, O, N, or D)
D is a period of days:
“・” is the first 10 days of the month (1st to 10th)
“・・” is the second 10 days of the month (11th to 20th)
“・・・” is the last 10–11 days of the month (21st to 31st)
N
ot
R
ec
o
m
m
en
de
● SARS02
Axial (φ 4 / φ 0.78)
NOTES:
- Dimensions in millimeters
- Bare lead: Pb-free (RoHS compliant)
- When soldering the products, be sure to minimize the working time within the following limits:
Flow: 260 ± 5 °C / 10 ± 1 s, 2 times
Soldering iron: 380 ± 10 °C / 3.5 ± 0.5 s, 1 time (Soldering should be at a distance of at least 1.5 mm from the
body of the products.)
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
11
SARS01, SARS02, SARS05, SARS10
● SARS05
SJP 4.5 mm × 2.6 mm
AS05
Device Code of SARS05
YMDD
Lot Number:
Y is the last digit of the year of manufacture (0 to 9)
M is the month of the year (1 to 9, O, N, or D)
DD is the day of the month (01 to 31)
ns
Polarity Marking (Cathode band)
es
ig
NOTES:
- Dimensions in millimeters
- Bare lead frame: Pb-free (RoHS compliant)
- When soldering the products, be sure to minimize the
working time, within the following limits:
Reflow (MSL 1):
Preheat: 180 °C, 90 ± 30 s
Solder heating: 250 °C, 10 ± 1s, 2 times (260 °C peak)
Soldering iron: 380 ± 10 °C, 3.5 ± 0.5s, 1 time
SJP Land Pattern Example
ew
D
2.0
rN
2.0
fo
4.0 to 4.2
SARS10
Y MD D
Part Number
Lot Number:
Y is the last digit of the year of manufacture (0 to 9)
M is the month of the year (1 to 9, O, N, or D)
DD is the day of the month (01 to 31)
N
ot
R
ec
o
m
m
en
de
d
● SARS10
TO220F-2L
1
2
NOTES:
- Dimensions in millimeters
- Bare lead frame: Pb-free (RoHS compliant)
- When soldering the products,be sure to minimize the working time, within the following limits:
Flow: 260 ± 5 °C / 10 ± 1 s, 2 times
Soldering Iron: 380 ± 10 °C / 3.5 ± 0.5 s, 1 time (Soldering should be at a distance of at least 1.5 mm from the
body of the products.)
- The recommended screw torque for TO220F: 0.490 N∙m to 0.686 N∙m (5 kgf∙cm to 7 kgf∙cm)
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
12
SARS01, SARS02, SARS05, SARS10
Operational Comparison of Clamp Snubber
Circuits
ns
Figure 24 shows a general clamp snubber circuit. In
the circuit, the surge voltage at tuning off a power
MOSFET is charged to CS through the surge absorb loop,
and is consumed by RS1 through the energy discharge
loop. All the consumed energy becomes loss in RS1. In
addition, the ringing of surge voltage results in poor
cross regulation of multi-outputs.
Figure 27 shows the clamp snubber circuit using the
SARS. The surge voltage at tuning off a power
MOSFET is charged to CS through the surge absorb loop.
Since the reverse recovery time, trr, of the SARS is a
relatively long period, the energy charged to CS is
discharged to the reverse direction of the surge absorb
loop until CS voltage is equal to the flyback voltage.
Some discharged energy is transferred to secondary side.
Thus, the power supply efficiency improves.
In addition, the power supply using the SARS reduces
the ringing voltage. Thus, the cross regulation of
multi-outputs can be improved.
CS
Energy
discharge loop
RS1
DFRD
es
ig
Energy
discharge loop
RS1
CS
Controller
D
RS2
ID
SARS
Surge absorb loop
ew
VDS
AC/DC converter IC
rN
Figure 24.
Controller
General Clamp Snubber Circuit
VDS
Clamp Snubber Circuit using SARS
VDS
ID
RS1: 570 kΩ
RS2: 22 Ω
CS: 1000 pF
SARS: SARS01
Waveforms of General Clamp Snubber
Circuit
Figure 28.
Waveforms of Clamp Snubber Circuit using
SARS
N
ot
R
Figure 25.
ec
o
m
m
en
ID
Surge absorb loop
VDS
AC/DC converter IC
d
de
RS1: 570 kΩ
CS: 1000 pF
DFRD: EG01C
fo
Figure 27.
ID
ID
VDS
ID
Figure 26.
VDS
Enlarged View of Figure 25
Figure 29.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
Enlarged View of Figure 28
13
SARS01, SARS02, SARS05, SARS10
Power Dissipation and Junction
Temperature Calculation
Figure 30 shows a typical application using the SARS.
Figure 31 shows the operating waveforms of the SARS.
The power dissipation of the SARS is calculated as
follows:
Energy
P3 …
Pk
es
ig
T
ns
0
SARS Current
D
Figure 31.
ew
In addition, by using the temperature of the SARS in
actual application operation, the estimated junction
temperature of the SARS is calculated by Equation (2)
and Equation (3). It should be enough lower than T J of
the absolute maximum rating.
fo
d
de
en
m
m
ec
o
R
ISARS
SARS
P2
(2)
where:
TJ(SARS) is junction temperature of the SARS,
TL is lead temperature of the SARS, and
J-L is thermal resistance between junction to lead.
● SARS10
(3)
Where:
TJ(SARS) is junction temperature of the SARS,
TC is case temperature of the SARS, and
J-C is thermal resistance between junction to case.
N
ot
VSARS
P1
0
● SARS01/02/05
A differential probe is recommended to use for the
measurement of VSARS. Please conform to the
oscilloscope manual about power dissipation
measurement including the delay compensation of
probe.
VSARS(10)
tk
rN
where:
PSARS is power dissipation of the SARS,
T is switching cycle of power MOSFET (s), and
Pk is average energy of period tk (W).
RS2
t3 …
VSARS
(1)
CS
t2
0
1) The waveforms of the SARS voltage, VSARS, and the
SARS current, ISARS, are measured in actual
application operation. VSARS × ISARS is calculated by
the math function of oscilloscope.
(Since the SARS10 incorporates a resistor, VSARS(10)
is measured.)
2) The each average energy (P1, P2…Pk) is measured at
period of each polarity of VSARS × ISARS (t1, t2,…tk) as
shown in Figure 30 by the automatic measurement
function of the oscilloscope.
3) The power dissipation of the SARS, PSARS, is
calucultaed by Equation (1):
RS1
t1
ISARS
Controller
AC/DC converter IC
Figure 30.
Typical Application
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
14
SARS01, SARS02, SARS05, SARS10
Parameter Setting of Snubber Circuit using
SARS
The temperature of the SARS and peripheral
components should be measured in actual application
operation.
The reference values of snubber circuit using the
SARS are as follows:
ns
● CS
680 pF to 0.01 μF.
The voltage rating is selected according to the voltage
subtraced the input voltage from the peak of VDS.
D
ew
rN
fo
N
ot
R
ec
o
m
m
en
de
d
● RS2
RS2 is the limited resistance in the energy discharging.
The value of 22 Ω to 220 Ω is connected to the SARS in
series (the SARS10 incorporates RS2).
The power rating of resistor should be selected from
the measurement of the effective current of RS2 based on
actual operation in the application.
es
ig
● RS1
RS1 is the bias resistance to turn off the SARS, and is
100 kΩ to 1 MΩ.
Since a high voltage is applied to RS1 that has high
resistance, the following should be considered according
to the requirement of the application:
- Select a resistor designed for electromigration, or
- Connect more resistors in series so that the applied
voltages of individual resistors can be reduced.
The power rating of resistor should be selected from
the measurement of the effective current of RS1 based on
actual operation in the application.
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
15
SARS01, SARS02, SARS05, SARS10
Reference Design of Power Supply
This section provides the information on a reference design, including power supply specifications, a circuit diagram,
the bill of materials, and transformer specifications.
ns
● Power Supply Specifications
Item
Specification
Input Voltage
85 VAC to 265 VAC
Output Power
34.8 W (40.4 W peak)
Output 1
8 V / 0.5 A
Output 2
14 V / 2.2 A (2.6 A peak)
● Circuit Schematic
F1
L1
D1
D2
es
ig
1
D51
T1
VOUT1
(+)
C1
D3
C3
R1
S1
C2
C51
D
D4
3
C52
R2
ew
D52
P1
D5
U1
R51
FB/OLP
5
S2
4
rN
D/ST
D/ST
GND
3
D6
D/ST
VCC
D/ST
S/OCP
7
2
d
STR3A400
R4
C6
PC1
m
● Bill of Materials
U51
R55
R52
C54
R56
(-)
C7
Ratings(1)
Recommended Part No.
D4
600 V, 1 A
EM01A
T1
D5
D6
D51
800 V, 1.2 A
Fast recovery, 200 V, 1 A
Schottky, 60 V, 1.5 A
SARS01
AL01Z
EK16
U1
U51
ot
R
ec
o
m
EM01A
EM01A
EM01A
D52
F1
L1(2)
PC1
R1(3)
R2
R3
R4(2)
R51
R52
R53(2)
R54(2)
R55
R56
N
Ratings(1)
Symbol
Film, 0.1 μF, 275 V
Electrolytic, 150 μF, 400 V
Ceramic, 1000 pF, 1 kV
Ceramic, 0.01 μF
Electrolytic, 22 μF, 50 V
Ceramic, 15 pF / 2 kV
Ceramic, 2200 pF, 250 V
Electrolytic, 680 μF, 25 V
Electrolytic, 680 μF, 25 V
Electrolytic, 470 μF, 16 V
Ceramic, 0.1 μF, 50 V
600 V, 1 A
600 V, 1 A
600 V, 1 A
C1
C2(2)
C3
C4
C5
C6(2)
C7(2)
C51(2)
C52
C53
C54(2)
D1
D2
D3
R53
R54
en
C4
Symbol
D
C5
1
OUT2
(+)
de
8
(2)
PC1
R3
fo
NC
C53
6
(-)
Recommended Part No.
Schottky, 100 V, 10 A
FMEN-210A
Fuse, 250 V AC, 3 A
CM inductor, 3.3 mH
Optocoupler, PC123 or equiv.
Metal oxide, 330 kΩ, 1 W
47 Ω, 1 W
10 Ω
0.47 Ω, 1/2 W
1 kΩ
1.5 kΩ
100 kΩ
6.8 kΩ
± 1%, 39 kΩ
± 1%, 10 kΩ
See the Transformer
Specification
IC,
STR3A453D
(TL431 or equiv.)
Shunt regulator, VREF = 2.5 V
(1)
Unless otherwise specified, the voltage rating of capacitor is 50 V or less and the power rating of resistor is 1/8 W or less.
Refers to a part that requires adjustment based on operation performance in an actual application.
(3)
High voltage is applied to this resistor that has high resistance. To meet your application requirements, it is required to select resistors designed for
electromigration, or to connect more resistors in series so that the applied voltages of individual resistors can be reduced.
(2)
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
16
SARS01, SARS02, SARS05, SARS10
● Transformer Specifications
Item
Primary Inductance, LP
Core Size
AL Value
Winding Specification
Winding Structure
Specification
518 μH
EER-28
245 nH/N2 (with a center gap of about 0.56 mm)
See Table 1
See Figure 32
es
ig
φ 0.23 × 2
φ 0.30
φ 0.30 × 2
φ 0.4 × 2
φ 0.4 × 2
φ 0.4 × 2
φ 0.4 × 2
Structure
Single-layer, solenoid winding
Single-layer, solenoid winding
Solenoid winding
Solenoid winding
Solenoid winding
Solenoid winding
Solenoid winding
D
P1
P2
D
S1-1
S1-2
S2-1
S2-2
Wire Diameter (mm)
ew
Primary Winding
Primary Winding
Auxiliary Winding
Output 1 Winding
Output 1 Winding
Output 2 Winding
Output 2 Winding
Number of Turns
(turns)
18
28
12
6
6
4
4
rN
Symbol
fo
Winding
ns
Table 1. Winding Specification
d
4 mm
2 mm
Pin side
m
D
S2-1 S1-1
P2
Margin tape
S2-2 S1-2
m
Margin tape
P1
en
de
VDC
ec
o
P1
S1-1
S1-2
14 V
VCC
S2-1
D
S2-2
GND
GND
R
● denotes the start of winding.
Cross-section View
Figure 32.
Winding Structure
N
ot
8V
Drain
Bobbin
Core
P2
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
17
SARS01, SARS02, SARS05, SARS10
Important Notes
N
ot
R
ec
o
m
m
en
de
d
fo
rN
ew
D
es
ig
ns
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DSGN-CEZ-16002
SARSxx-DSE Rev.1.2
SANKEN ELCTRIC CO., LTD.
Jan. 30, 2017
http://www.sanken-ele.co.jp/en
© SANKEN ELECTRIC CO., LTD. 2015
18
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