SR036 SUTEX | Alldatasheet

Document overview

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Technical content

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

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 Surge Protection SR036 or SR037 100µF 1.0µF SR036: VOUT=3.3V Regulated SR037: VOUT=5.0V Regulated ~18V Unregulated 120VAC or 240VAC VOUT VSOURCE Gate Demo Kit Available

Absolute Maximum Ratings* VIN, High Voltage Input +700V VOUT, Low Voltage Output +6.0V Storage Temperature -65 °C to +150°C Soldering Temperature +300 °C Power Dissipation, MSOP-8 300mW Power Dissipation, SO-8 slug 1.50W * All voltages are referenced to GND.

Ordering Information

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Electrical Characteristics

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Typical Performance Curves Gate Clamp Temperature (°C) HVIN (off) Temperature (°C) HVIN (V) HVIN (V) Vgate (V) HV Input Current IIN (µA) Load Regulation (SR037) VOUT (V) IOUT (mA) Regulator Output (SR037) VOUT (V) Source Voltage (V) Gate Voltage HVIN (V) VGate (V) -40 -10 20 50 80 110 140 -40 -10 20 50 80 110 140 05 1 0 15 20 25 01 0 2 03 04 05 06 07 0 80 05 0 100 150 200 250 300 350 400 300 600 900 1200 1500 1800 2100 05 1 0 15 20 25 30 35 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 5.05 Source=8V 25°C Source=15V 25°C -40 °C 25 °C 125 °C

Applications Information Functional Block Diagram VREF CM Reg HVIN Gate Source GND VOUT 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 V TH 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. Switch ON VTH HVIN VREG VUNREG not to scale Figure 1: Typical Waveforms

Applications Information, continued

1235 Bordeaux Drive, Sunnyvale, CA 94089

TEL: (408) 744-0100 • FAX: (408) 222-4895 www.supertex.com 06/13/02rev.12 ©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited. 220µF 1µF SR037 VN2460N8 120VAC or 240VAC Fuse Surge Protection Logic Control Circuit Unregulated Voltage 5.0V 5V Coil Relay Vz 5.1V HVIN GND Gate Source VOUT 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. 220µF 1µF SR036 or SR037 TN2425N8 120VAC Fuse Surge Protection 330Ω330Ω Unregulated Voltage HVIN GND Gate Source VOUT Figure 7: Driving LEDs from 120VAC VREG 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.