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TNY268P Datasheet(PDF) 2 Page - Power Integrations, Inc. |
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TNY268P Datasheet(HTML) 2 Page - Power Integrations, Inc. |
2 / 22 page Rev. H 02/09 2 TNY263-268 www.powerint.com Figure 2. Functional Block Diagram. Figure 3. Pin Configuration. Pin Functional Description DRAIN (D) Pin: Power MOSFET drain connection. Provides internal operating current for both start-up and steady-state operation. BYPASS (BP) Pin: Connection point for a 0.1 μF external bypass capacitor for the internally generated 5.8 V supply. ENABLE/UNDERVOLTAGE (EN/UV) Pin: This pin has dual functions: enable input and line undervoltage sense. During normal operation, switching of the power MOSFET is controlled by this pin. MOSFET switching is terminated when a current greater than 240 μA is drawn from this pin. This pin also senses line undervoltage conditions through an external resistor connected to the DC line voltage. If there is no external resistor connected to this pin, TinySwitch-II detects its absence and disables the line undervoltage function. SOURCE (S) Pin: Control circuit common, internally connected to output MOSFET source. SOURCE (HV RTN) Pin: Output MOSFET source connection for high voltage return. PI-2643-030701 CLOCK OSCILLATOR 5.8 V 4.8 V SOURCE (S) S R Q DCMAX BYPASS (BP) + - VI LIMIT FAULT PRESENT CURRENT LIMIT COMPARATOR ENABLE LEADING EDGE BLANKING THERMAL SHUTDOWN + - DRAIN (D) REGULATOR 5.8 V BYPASS PIN UNDER-VOLTAGE 1.0 V + VT ENABLE/ UNDER- VOLTAGE (EN/UV) Q 240 A50 A LINE UNDER-VOLTAGE RESET AUTO- RESTART COUNTER JITTER 1.0 V 6.3 V CURRENT LIMIT STATE MACHINE PI-2685-101600 EN/UV D S S S (HV RTN) S (HV RTN) BP P Package (DIP-8B) G Package (SMD-8B) 8 5 7 1 4 2 3 |
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