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TOP222Y Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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TOP222Y Datasheet(HTML) 2 Page - Power Integrations, Inc. |
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2 / 21 page  TOP221-227 D 7/01 2 Figure 2. Functional Block Diagram. Pin Functional Description DRAIN Pin: Output MOSFET drain connection. Provides internal bias current during start-up operation via an internal switched high- voltage current source. Internal current sense point. CONTROL Pin: Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used as the connection point for the supply bypass and auto-restart/ compensation capacitor. SOURCE Pin: Y package – Output MOSFET source connection for high voltage power return. Primary side circuit common and reference point. P and G package – Primary side control circuit common and reference point. SOURCE (HV RTN) Pin: (P and G package only) Output MOSFET source connection for high voltage power return. PI-1935-091696 SHUTDOWN/ AUTO-RESTART PWM COMPARATOR CLOCK SAW OSCILLATOR CONTROLLED TURN-ON GATE DRIVER INTERNAL SUPPLY 5.7 V 4.7 V SOURCE S R Q Q DMAX - + CONTROL - + 5.7 V IFB RE ZC VC MINIMUM ON-TIME DELAY + - VI LIMIT LEADING EDGE BLANKING POWER-UP RESET S R Q Q ÷ 8 0 1 THERMAL SHUTDOWN SHUNT REGULATOR/ ERROR AMPLIFIER + - DRAIN PI-2084-040401 CONTROL DRAIN SOURCE Y Package (TO-220/3) Tab Internally Connected to SOURCE Pin CONTROL 8 5 7 6 DRAIN SOURCE (HV RTN) SOURCE SOURCE 1 4 2 3 SOURCE (HV RTN) SOURCE (HV RTN) SOURCE P Package (DIP-8) G Package (SMD-8) Figure 3. Pin Configuration. |
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