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TOP222P Datasheet(PDF) 6 Page - Power Integrations, Inc. |
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TOP222P Datasheet(HTML) 6 Page - Power Integrations, Inc. |
6 / 20 page TOP221-227 C 12/97 6 Figure 7. Schematic Diagram of a 4W TOPSwitch-II Stand-by Power Supply using an 8 lead PDIP. Application Examples Following are just two of the many possible TOPSwitch implementations. Refer to the Data Book and Design Guide for additional examples. 4W Stand-by Supply using 8 Lead PDIP Figure 7 shows a 4W stand-by supply. This supply is used in appliances where certain stand-by functions (e.g. real time clock, remote control port) must be kept active even while the main power supply is turned off. The 5V secondary is used to supply the stand-by function and the 12V non-isolated output is used to supply power for the PWM controller of the main power supply and other primary side functions. For this application the input rectifiers and input filter are sized for the main supply and are not shown. The input DC rail may vary from 100V to 380V DC which corresponds to the full universal AC input range. The TOP221 is packaged in a 8 pin power dip package. The output voltage (5V) is directly sensed by the zener diode (VR1) and the optocoupler (U2). The output voltage is determined by the sum of the zener voltage and the voltage drop across the LED of the optocoupler (the voltage drop across R1 is negligible). The output transistor of the optocoupler drives the CONTROL pin of the TOP221. C5 bypasses the CONTROL pin and provides control loop compensation and sets the auto-restart frequency. The transformer’s leakage inductance voltage spikes are snubbed by R3 and C1 through diode D1. The bias winding is rectified and filtered by D3 and C4 providing a non-isolated 12V output which is also used to bias the collector of the optocoupler’s output transistor. The isolated 5V output winding is rectified by D2 and filtered by C2, L1 and C3. Wide-Range DC Input D S C CONTROL PI-2115-111797 + - R3 47K D1 UF4005 C1 2.2 nF 1KV D2 UF5401 TOP221P L1 3.3 µH D3 IN4148 C4 100 µF 16V U2 PC817A R1 10 Ω C3 100 µF 10V +5V C5 47 µF 10V C2 330 µF 10V U1 R2 100 Ω VR1 TOPSwitch-II T1 RTN + - 12V Non-Isolated |
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