SR037MG

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 100µF Surge Protection Gate 120VAC or 240VAC SR036 or SR037 VSOURCE VOUT SR036: VOUT=3.3V Regulated SR037: VOUT=5.0V Regulated 1.0µF 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. 1 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 -65°C to +150°C +300°C 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=0°C to +125°C) 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 = ±100µA 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 125 ° C 1800 5.00 25 ° C -40 ° C 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 (µA) 900 VOUT (V) Source=15V 25 ° C Source=8V 25 ° C 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 4 SR036/SR037 Applications Information, continued Fuse Surge Protection VN2460N8 VUNREG 220µF 1KΩ IOUT typical 40mA (IUNREG + IREG) Gate HVIN Source VOUT 120VAC or 240VAC SR036 or SR037 GND VREG 1µF 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 1KΩ resistor can be added for applications requiring an enable control. Fuse VN2460N8 220µF 2N3904 Vout1=5.0V 10KΩ Vz 5.6V Vout2=3.3V 1µF 1MΩ 1µF 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 220µF 1N4001 120VAC or 240VAC Gate HVIN Source VOUT 3.3V 1µF 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 220µF Gate HVIN Source VOUT SR037 GND 5.0V 1µF Logic Control Circuit 1KΩ 2N3904 100Ω 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= = 100Ω 40mA 1KΩ - Vbe β , where Vbe = 0.6V and β = 100 40mA 6 SR036/SR037 Applications Information, continued Fuse Surge Protection VN2460N8 Unregulated Voltage 120VAC or 240VAC 220µF Vz 5.1V 5V Coil Relay Gate HVIN Source VOUT SR037 GND 5.0V 1µF 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 220µF 120VAC Gate HVIN Source VOUT SR036 or SR037 GND VREG 1µF 330Ω 330Ω 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 ©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. 7 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 • FAX: (408) 222-4895 www.supertex.com