SR036.pdf

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SR036/SR037
SR036
SR037
Inductorless, Dual Output Off-Line Regulators
Features
❑
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.
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
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.
SMPS house keeping power supplies
❑
White goods
❑
Appliances
❑
Small off-line low voltage power supplies
❑
Lighting controls
❑
SR03x Typical Application Circuit
~ 18V Unregulated
1.0µF
470µF
GN2470
120VAC
or
230VAC
SR036: V OUT = 3.3V Regulated
SR037: V OUT = 5.0V Regulated
V SOURCE
SR036
or SR037
HV IN
V OUT
1.0µF
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SR036/SR037
Ordering Information
P
O
V
O
M
S
w
H
S
3
S
S
5
S
S
*
Pin Configuration
Absolute Maximum Ratings*
V IN , High Voltage Input
+700V
HV IN
Gate
1
2
3
4
8
7
6
5
V OUT , Low Voltage Output
+6.0V
N/C
Source
N/C
V OUT
GND
N/C
Storage Temperature
-65°C to +150°C
MSOP-8
(top view)
Soldering Temperature
+300°C
Power Dissipation, MSOP-8
300mW
HV IN
Gate
1
2
8
7
Power Dissipation, SO-8 slug
1.50W 1
N/C
Source
* All voltages are referenced to GND.
N/C
V OUT
3
4
6
5
GND
N/C
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.
SO-8 Slug
Make no electrical connections
to Backside Plate
(top view)
Electrical Characteristics
(Over operating supply voltages unless otherwise specified, T A =0°C to +125°C)
S
P
M
T
M
U
C
7
P
t
v
H
I
v
V
I
4
P
r
A
v
V
H
v
w
G
i
p
t
g
4
4
5
V
T
I
V
G
t
s
c
v
±
±
±
V
I
=
±
A
G
G
V
G
t
g
c
v
1
2
2
V
G
S
2
3
3
V
=
1
R
o
v
f
t
S
S
V
V
O
w
h
s
S
4
5
5
V
=
1
S
V
=
1
S
∆ V
V
l
r
2
1
m
O
O
I
=
0
t
5
(
L
F
I
A
f
4
1
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:
2
V
IN
P
≈
+
(16V
−
V
)
×
I
OUT
OUT
185k
Ω
Where I OUT is the load on the regulated output
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SR036/SR037
Typical Performance Curves
Gate Clamp
HV IN (off)
25
60
50
20
40
15
30
10
20
5
10
0
0
-40
-10
20
50
80
110
140
-40
-10
20
50
80
110
140
Temperature (
C)
Temperature (
C)
°
°
Regulator Output (SR037)
Gate Voltage
6
20
18
5
16
14
4
12
3
10
8
2
6
4
1
2
0
0
0
5
10
15
20
25
0 0 0 0 0 0 0 080
Source Voltage (V)
HV IN (V)
HV Input Current
Load Regulation (SR037)
2100
5.05
125 ° C
5.00
1800
25
°
C
4.95
-40
°
C
1500
4.90
Source=15V
25 ° C
1200
4.85
900
4.80
600
Source=8V
25 ° C
4.75
300
4.70
0
4.65
0
50
100
150
200
250
300
350
400
0
10
20
30
40
50
HV IN (V)
I OUT (mA)
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SR036/SR037
Applications Information
Functional Block Diagram
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.
HV IN
Gate Source
V REF
CM
Reg
V OUT
GND
Switch ON
HV IN
V TH
V UNREG
V REG
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 / 185ký 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
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SR036/SR037
Using a MOSFET in place of an IGBT
~ 18V Unregulated
VN2460
1.0
µ
F
270
µ
F
120VAC
or
230VAC
SR036: V OUT =3.3V Regulated
SR037: V OUT =5.0V Regulated
V SOURCE
SR036
or SR037
HV IN
V OUT
1.0
µ
F
SRO3 Efficiency
SR03 Efficiency
50
VN2460, no EMI
GN2470, no EMI
40
30
VN2460, w/EMI
GN2470, w/EMI
20
0.00.1 0.20.30.40.50.60.70.80.91.01.11.21.3 1.41.51.6
P UN REG
(W)
Efficiency and EMI Test Circuit
GN2470
120/230VAC
50/60Hz
V UNREG
P6KE
400CA
220μF (VN2460)
470μF (GN2470)
EMI
Suppressor
1.0μF
C G
220pF
R G
180k Ω
V IN
GATE
SOURCE
SR03x
V REG
V REG
GND
C REG
1.0μF
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