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SR036 SR037
Demo Kit Available
SR036/SR037
Inductorless, Dual Output Off-Line Regulators
Features
Accepts peak input voltages up to 700V Operates directly off of rectified 120V AC or 240V AC Integrated linear regulator Minimal power dissipation No high voltage capacitors required No transformers or inductors required
General Description
The Supertex SR036 and SR037 are inductorless, dual output off-line controllers. They do not require any transformers, inductors, or high voltage input capacitors. The input voltage, HVIN, is designed to operate from an unfiltered full wave rectified 120V or 240V AC line. It is designed to control an external N-channel MOSFET. When HVIN is between VGS(th) to 40V, where VGS(th) is the threshold voltage of the external MOSFET, the external N-channel MOSFET is turned on allowing it to charge an external capacitor connected to VSOURCE. An unregulated DC voltage will develop on VSOURCE. Once HVIN is above 45V, the N-channel MOSFET is turned off. The maximum gate voltage for the external MOSFET 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.
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
~18V Unregulated
100F
Gate
Surge Protection
120VAC or 240VAC
SR036 or SR037
VSOURCE VOUT
SR036: VOUT=3.3V Regulated SR037: VOUT=5.0V Regulated 1.0F
06/13/02
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
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SR036/SR037
Ordering Information
HVIN Maximum Voltage Gate Voltage (max) VOUT 3.3V 5.0V Package Options MSOP-8 700V 24V SR036MG* SR037MG* SO-8 w/ Heat Slug SR036SG SR037SG
* Product supplied on 2500 piece carrier tape reel.
Absolute Maximum Ratings*
VIN, High Voltage Input VOUT, Low Voltage Output Storage Temperature Soldering Temperature Power Dissipation, MSOP-8 Power Dissipation, SO-8 slug
* All voltages are referenced to GND.
Pin Configuration
+700V
HVIN
1 2 3 4
8 7 6 5
Gate Source VOUT N/C
+6.0V -65C to +150C +300C 300mW 1.50W
N/C N/C GND
MSOP-8 (top view)
HVIN N/C N/C GND
1 2 3 4
8 7 6 5
Gate Source VOUT N/C
SO-8 Slug Backside: GND (top view)
Electrical Characteristics
(Over operating supply voltages unless otherwise specified, TA=0C to +125C)
Symbol HVIN VTH VGS VGATE VOUT VOUT Freq Input voltage HVIN voltage when Gate is pulled to ground Gate to source clamp voltage Gate to ground clamp voltage Regulated output voltage for the MSOP-8 Regulated output voltage for the SO-8 with heat slug Input AC frequency SR036 SR037 SR036 SR037 40 10 18 2.97 4.50 2.97 4.5 40 45 15 20 3.30 5.00 3.30 5.00 Parameter Min Typ Max 700 407 50 20 24 3.63 5.50 3.63 5.50 100 Units V V V V V V Hz VSOURCE = 10V, IOUT = 15mA VSOURCE = 10V, IOUT = 15mA VSOURCE = 10V, IOUT = 30mA VSOURCE = 10V, IOUT = 30mA IGS = 100A Conditions Peak transient voltage Peak rectified AC voltage
2
SR036/SR037
Typical Performance Curves
Gate Clamp
25 60
HVIN (off)
20
50
40
Vgate (V)
HVIN (V)
-40 -10 20 50 80 110 140
15
30
10
20 5
10
0
0 -40 -10 20 50 80 110 140
Temperature (C) Regulator Output (SR037)
6 20 18 5 16 14
Temperature (C) Gate Voltage
VGate (V)
0 5 10 15 20 25
4
VOUT (V)
12 10 8
3
2
6 4 2
1
0
0 0 10 20 30 40 50 60 70 80
Source Voltage (V) HV Input Current
2100 125C 1800 5.00 25C -40C 4.95 4.90 4.85 4.80 600 4.75 4.70 4.65 0 50 100 150 200 250 300 350 400 0 5 10 5.05
HVIN (V) Load Regulation (SR037)
1500
1200
IIN (A)
900
VOUT (V)
Source=15V 25C
Source=8V 25C
300 0
15
20
25
30
35
HVIN (V)
IOUT (mA)
3
SR036/SR037
Applications Information
Operating Principle
The SR03x operates by controlling the conduction angle of the external MOSFET as shown in Figure 1. When the rectified AC voltage is below the VTH threshold, the pass transistor is turned on. The pass transistor is turned off when the rectified AC is above HVIN(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.
Functional Block Diagram
HVIN VREF
CM
Gate
Source
Reg
VOUT
GND
Switch ON
HVIN V TH VREG
not to scale
VUNREG
Figure 1: Typical Waveforms
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SR036/SR037
Applications Information, continued
Fuse
Surge Protection
VN2460N8 VUNREG 220F 1K IOUT typical 40mA (IUNREG + IREG)
Gate HVIN Source VOUT
120VAC or 240VAC
SR036 or SR037
GND
VREG 1F
ON/OFF
TN2106K1
Figure 2: Example Circuit with Enable Control
Figure 2 is an example circuit using the SR036 or SR037 along with a Supertex VN2460N8 MOSFET to generate an unregulated voltage of approximately 18V and a regulated voltage of 3.3V for the SR036 or 5.0V for the SR037. The combined total output current is typically 40mA. The TN2106K1 in series with a 1K resistor can be added for applications requiring an enable control.
Fuse
VN2460N8 220F
2N3904 Vout1=5.0V 10K Vz 5.6V Vout2=3.3V 1F 1M 1F
120VAC or 240VAC
Surge Protection
Gate HVIN
Source VOUT
SR036
GND
Figure 3: Generating Two Regulated Voltages
For applications requiring two regulated voltages, an inexpensive discrete linear regulator can be added to regulate the unregulated output as show in Figure 3. The discrete linear regulator consists of a Zener diode, a resistor and a bipolar transistor. The regulated voltage, Vout1, is determined by the Zener diode voltage minus the base-to-emitter voltage drop of 0.6V. Figure 3 uses a 5.6V Zener diode to obtain a 5.0V output. Different Zener diode voltages can be used to obtain different regulated output voltages.
5
SR036/SR037
Applications Information, continued
Fuse
Surge Protection
VN2460N8
Unregulated Voltage
120VAC or 240VAC
220F
1N4001
Gate HVIN
Source VOUT
3.3V 1F
SR036
GND
Logic Control Circuit
12V Coil Relay VN2110K1
Figure 4: Driving 12V Relay Coils
The circuit shown in Figure 4 uses the SR036 to supply a regulated 3.3V for the logic control circuitry while the unregulated voltage is used to drive a 12V relay coil. The operating voltage for a 12V relay coil is typically very wide and can therefore operate directly from the unregulated line.
Fuse
Surge Protection
VN2460N8
Unregulated Voltage 1N4001
120VAC or 240VAC
220F
Gate HVIN
Source VOUT
SR037
GND
5.0V 1F
Logic Control Circuit
1K 2N3904 100
5V Coil Relay
Figure 5: Driving 5V Relay Coils
The circuit shown in Figure 5 uses the SR037 to supply a regulated 5.0V for the logic control circuitry while the unregulated voltage is used to drive a 5.0V coil relay. To overcome the voltage variation of the unregulated line, a bipolar transistor is used to drive the coil with a constant current. The resistor value from the emitter to ground sets the desired coil current. For an arbitrary coil current of 40mA, the resistor value can be calculated as:
5.0V R= = 100
40mA 1K - Vbe , where Vbe = 0.6V and = 100 40mA
6
SR036/SR037
Applications Information, continued
Fuse
Surge Protection
VN2460N8
Unregulated Voltage Vz 5.1V 5V Coil Relay
120VAC or 240VAC
220F
Gate HVIN
Source VOUT
SR037
GND
5.0V 1F
Logic Control Circuit
Figure 6: Driving 5V Relay Coils with Zener Diode Clamp
The circuit shown in Figure 6 uses the SR037 to supply a regulated 5.0V for the logic control circuitry. A 5.1V Zener diode is used in parallel with the 5.0V relay coil to ensure that the relay coil's maximum operating voltage is not exceeded. The Zener diode also acts as the catch diode when the coil is switched to the off state. An external series resistor is used to limit the amount of Zener current.
Fuse
Surge Protection
TN2425N8
Unregulated Voltage
220F
120VAC
Gate HVIN
Source VOUT
SR036 or SR037
GND
VREG
1F
330 330
Figure 7: Driving LEDs from 120VAC
The circuit shown in Figure 7 uses the SR036 or SR037 to drive 12 high efficient red LEDs from a 120V AC line. The average LED current is approximately 20mA.
06/13/02rev.12
(c)2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
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1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 * FAX: (408) 222-4895 www.supertex.com

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