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SR037SG Datasheet(PDF) 7 Page - Supertex, Inc |
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SR037SG Datasheet(HTML) 7 Page - Supertex, Inc |
7 / 7 page 7 SR036/SR037 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. 220 µF 1 µF SR037 VN2460N8 120VAC or 240VAC Fuse Logic Control Circuit Unregulated Voltage 5.0V 5V Coil Relay Vz 5.1V HV IN GND Gate Source V OUT 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. 220 µF 1 µF SR036 or SR037 TN2425N8 120VAC Fuse 330 Ω 330 Ω Unregulated Voltage HV IN GND Gate Source V OUT 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. |
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