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SR037SG Datasheet(PDF) 5 Page - Supertex, Inc |
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SR037SG Datasheet(HTML) 5 Page - Supertex, Inc |
5 / 7 page 5 SR036/SR037 Applications Information, continued 220 µF 1 µF SR036 or SR037 VN2460N8 VUNREG HV IN GND Gate Source V OUT VREG IOUT typical 40mA ( IUNREG + IREG) Fuse 120VAC or 240VAC Figure 2: Example Circuit with Enable Control 1K Ω TN2106K1 ON/OFF Figure 3: Generating Two Regulated Voltages 220 µF 1 µF SR036 VN2460N8 1 µF 1M Ω Vz 5.6V Vout1=5.0V Vout2=3.3V 10K Ω 120VAC or 240VAC Fuse 2N3904 HV IN GND Gate Source V OUT Figure 2 is an example circuit using the SR036 or SR037 along with a Supertex VN2460N8 MOSFET to generate an unregu- lated 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. For applications requiring two regulated voltages, an inexpen- sive 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. |
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