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Электронный компонент: SR037SG

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1
SR036/SR037
B092005
Inductorless, Dual Output Off-Line Regulators
SR036
SR037
General Description
The Supertex SR036 and SR037 are inductorless, dual output
off-line controllers, providing up to 1.0W of output power. They
do not require any transformers, inductors, or high voltage
input capacitors. The input voltage, HV
IN
, is designed to
operate from an unfiltered full wave rectified 120V or 230V AC
line. It is designed to control an external N-channel MOSFET
or IGBT. When HV
IN
is less than 45V, the external transistor is
turned-on allowing it to charge an external capacitor connected
to V
SOURCE
. An unregulated DC voltage will develop on V
SOURCE
.
Once HV
IN
is above 45V, the transistor is turned off. The
maximum gate voltage for the external transistor is 24V. The
unregulated voltage is approximately 18V. The SR036 also
provides a regulated 3.3V whereas the SR037 provides a
regulated 5.0V.
WARNING!!! Galvanic isolation is not provided. Dangerous
voltages are present when connected to the AC line. It is
the responsibility of the designer to assure adequate
safeguards are in place to protect the end user from
electrical shock.
Features
Accepts peak input voltages up to 700V
Operates directly off of rectified 120V AC or 230V AC
Integrated linear regulator
Minimal power dissipation
No high voltage capacitors required
No transformers or inductors required
Up to 1.0W output power
Applications
3.3V or 5.0V power supplies
SMPS house keeping power supplies
White goods
Appliances
Small off-line low voltage power supplies
Lighting controls
SR03x Typical Application Circuit
S
ur
g
e
Pr
otection
SR036
or SR037
470F
1.0F
SR036: V
OUT
= 3.3V Regulated
SR037: V
OUT
= 5.0V Regulated
~
18V Unregulated
120VAC
or
230VAC
V
OUT
V
SOURCE
Gate
HV
IN
GN2470
1.0F
B092005
Not R
ecommended
Not R
ecom
men
ded
For Ne
w Designs!
For
New
Des
igns
!
2
SR036/SR037
B092005
Absolute Maximum Ratings*
V
IN
, High Voltage Input
+700V
V
OUT
, Low Voltage Output
+6.0V
Storage Temperature
-65C to +150C
Soldering Temperature
+300C
Power Dissipation, MSOP-8
300mW
Power Dissipation, SO-8 slug
1.50W
1
* All voltages are referenced to GND.
1. When underside plate soldered to 2cm
2
of exposed copper.
*Absolute Maximum Ratings are those values beyond which damage to the
device may occur. Functional operation under these conditions is not implied.
Continuous operation of the device at the absolute rating level may affect device
reliability. All voltages are referenced to device ground.
Ordering Information
V
T
U
O
s
n
o
i
t
p
O
e
g
a
k
c
a
P
8
-
P
O
S
M
g
u
l
S
t
a
e
H
/
w
8
-
O
S
V
3
.
3
*
G
M
6
3
0
R
S
G
S
6
3
0
R
S
V
0
.
5
*
G
M
7
3
0
R
S
G
S
7
3
0
R
S
.l
e
e
r
e
p
a
t
r
e
i
r
r
a
c
e
c
e
i
p
0
0
5
2
n
o
d
e
il
p
p
u
s
t
c
u
d
o
r
P
*
Pin Configuration
SO-8 Slug
Make no electrical connections
to Backside Plate
(top view)
1
2
3
4
8
7
6
5
HV
IN
Gate
N/C
Source
N/C
V
OUT
GND
N/C
MSOP-8
(top view)
1
2
3
4
8
7
6
5
HV
IN
Gate
N/C
Source
N/C
V
OUT
GND
N/C
Electrical Characteristics
(Over operating supply voltages unless otherwise specified, T
A
=0C to +125C)
l
o
b
m
y
S
r
e
t
e
m
a
r
a
P
n
i
M
p
y
T
x
a
M
s
t
i
n
U
s
n
o
i
t
i
d
n
o
C
V
H
N
I
e
g
a
t
l
o
v
t
u
p
n
I
0
0
7
V
e
g
a
t
l
o
v
t
n
e
i
s
n
a
r
t
k
a
e
P
7
0
4
e
g
a
t
l
o
v
C
A
d
e
i
f
i
t
c
e
r
k
a
e
P
V
H
T
V
H
N
I
d
n
u
o
r
g
o
t
d
e
ll
u
p
s
i
e
t
a
G
n
e
h
w
e
g
a
t
l
o
v
0
4
5
4
0
5
V
V
S
G
e
g
a
t
l
o
v
p
m
a
l
c
e
c
r
u
o
s
o
t
e
t
a
G
0
1
5
1
0
2
V
I
S
G
A
0
0
1
=
V
E
T
A
G
e
g
a
t
l
o
v
p
m
a
l
c
d
n
u
o
r
g
o
t
e
t
a
G
8
1
0
2
4
2
V
V
T
U
O
8
-
O
S
e
h
t
r
o
f
e
g
a
t
l
o
v
t
u
p
t
u
o
d
e
t
a
l
u
g
e
R
g
u
l
s
t
a
e
h
h
t
i
w
6
3
0
R
S
7
9
.
2
0
3
.
3
3
6
.
3
V
V
E
C
R
U
O
S
V
0
1
=
7
3
0
R
S
5
.
4
0
0
.
5
0
5
.
5
V
E
C
R
U
O
S
V
0
1
=
V
T
U
O
V
T
U
O
n
o
i
t
a
l
u
g
e
r
d
a
o
l
0
2
0
2
1
V
m
V
E
C
R
U
O
S
,
V
0
1
=
I
d
a
o
L
)
1
(
A
m
0
5
o
t
0
=
q
e
r
F
y
c
n
e
u
q
e
r
f
C
A
t
u
p
n
I
0
4
0
0
1
z
H
(1) Load current on the regulated output must not cause SR03 power dissipation to exceed max ratings. Worst case power dissipation is
given by:
P
V
185k
(16V
V
I
IN
2
OUT
OUT
+
-
)
Where I
OUT
is the load on the regulated output
3
SR036/SR037
B092005
Typical Performance Curves
Gate Clamp
Temperature (
C)
HV
IN
(off)
Temperature (
C)
HV
IN
(V)
HV
IN
(V)
Vgate (V)
HV Input Current
I
IN
(
A)
Load Regulation (SR037)
V
OUT
(V)
I
OUT
(mA)
Regulator Output (SR037)
V
OUT
(V)
Source Voltage (V)
Gate Voltage
HV
IN
(V)
V
Gate
(V)
-40
-10
20
50
80
110
140
0
5
10
15
20
25
-40
-10
20
50
80
110
140
0
10
20
30
40
50
60
0
5
10
15
20
25
0
1
2
3
4
5
6
0
10
20
30
40
50
60
70
80
0
2
4
6
8
10
12
14
16
18
20
0
50
100
150
200
250
300
350
400
0
300
600
900
1200
1500
1800
2100
0
10
20
30
40
50
4.65
4.70
4.75
4.80
4.85
4.90
4.95
5.00
5.05
-40
C
Source=15V
25
C
Source=8V
25
C
25
C
125
C
4
SR036/SR037
B092005
Applications Information
Functional Block Diagram
V
REF
CM
Reg
HV
IN
Gate
Source
GND
V
OUT
Operating Principle
The SR03x operates by controlling the conduction angle of the
external MOSFET or IGBT as shown in Figure 1. When the
rectified AC voltage is below the V
TH
threshold, the pass transistor
is turned on. The pass transistor is turned off when the rectified
AC is above HV
IN(off)
. Output voltage (Vunreg) decays during the
periods when the switch is off and when the rectified AC is below
the output voltage. The amount of decay is determined by the
load and the value of C1. Since the switch only conducts with low
voltages across it, power dissipation is minimized.
Switch ON
V
TH
HV
IN
V
REG
V
UNREG
not to scale
Figure 1: Typical Waveforms
Power Dissipation
Power dissipation in the SR03 is from 2 sources. The first is due to the bias current (or overhead) required to operate the device. This may
be calculated from P
BIAS
= V
IN
2
/ 185k where V
IN
is the input voltage in V
RMS
. The second source of power dissipation is the 3.3/5V linear
regulator and may be calculated from P
REG
= (16V - V
OUT
) * I
REG
, where V
OUT
is 3.3V or 5V, and I
REG
is the load current on the 3.3/5V output.
The total power dissipated by the SR03x is the sum of these two: P
BIAS
+ P
REG
. (These equations are conservative actual dissipation may
be less.)
To adequately dissipate the power, the underside plate of the SR03xSG should be soldered to at least 2cm
2
of exposed copper area on
the PCB.
Power is also dissipated by the pass transistor. Power dissipated by the transistor will be (16V * I
TOTAL
) * (1/Eff -1) where I
TOTAL
is the sum
of the load currents on the regulated and unregulated outputs and Eff is the converter efficiency (see Efficiency Graph next page). The
transistor should be soldered to at least 5cm
2
of exposed copper area on the PCB for heatsinking.
Transformers
5
SR036/SR037
B092005
R
G
180k
C
G
220pF
GN2470
GATE
V
IN
SOURCE
V
REG
120/230VAC
50/60Hz
GND
EMI
Suppressor
SR03x
V
UNREG
V
REG
220F (VN2460)
470F (GN2470)
C
REG
1.0F
P6KE
400CA
1.0F
Using a MOSFET in place of an IGBT
Efficiency and EMI Test Circuit
20
30
40
50
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
P
UNREG
VN2460, no EMI
VN2460, w/EMI
GN2470, no EMI
GN2470, w/EMI
SR03 Efficiency
(W)
)
%
(
y
c
n
e
i
c
i
f
f
E
SRO3 Efficiency
Sur
g
e
Pr
otection
SR036
or SR037
1.0
F
SR036: V
OUT
=3.3V Regulated
SR037: V
OUT
=5.0V Regulated
~
18V Unregulated
120VAC
or
230VAC
V
OUT
V
SOURCE
Gate
HV
IN
VN2460
270
F
1.0<