NTE7166 Integrated Circuit Flyback Switching Regulator Description: The NTE7166 is an integrated circuit in a 5 - Lead Staggered TO3P type package and is specifically designed to satisfy the requirements for increased integration and reliability in off - line quasi- resonant flyback converters. This device incorporates a primary control and drive circuit with discrete avalanche - rated power MOSFETs. Cycle - by - cycle current limiting, under - voltage lockout with hysteresis, over - voltage protection, and thermal shutdown protects the power supply during th normal overload an fault conditions. Over voltge protection and thermal shutdown are latched after a short delay. The latch may be reset by cycling the input supply. Low - current startup and a low - power standby mode selected from the secondary circuit completes a comprehensive suite of features. Features: D Flyback Operation with Quasi - Resonant Soft Switching for Low Power Dissipation and EMI D Rugged Avalanche - Rated MOSFET D Full Over - Current Protection (No Blanking) D Under - Voltage Lockout with Hysteresis D Over - Voltage Protection D Direct Voltage Feedback D Low Start - Up Current D Low - Frequency, Low - Power Standby Operation Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Control Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V Drain - Source Voltage, VDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 450V Drain Switching Current, ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16A Peak Drain Current, IDM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26A Avalanche Energy, EAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327mJ OCP/FB Voltage Range, VOCP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 0.3V to +6V Power Dissipation (VIN x IIN(ON)), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8W FET Channel Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Internal Case Temperature, TC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125°C Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 20° to +125°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40° to +125°C Thermal Resistance, Junction - to - Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.75°C/W Electrical Characteristics: (TA = +25°C, VIN = 18V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit On - State Voltage VINT Turn - On, Increasing VIN 14.4 16.0 17.6 V Under- Voltage Lockout VINQ Turn - Off, Decreasing VIN 9 10 11 V Over - Voltage Threshold VOVP(th) Turn - Off, Increasing VIN 20.5 22.5 24.5 V Drain- Source Breakdown Voltage VBR(DSS) ID = 300µA VDSmax - - V IDSS At VDSmax - - 300 µA VS = 10V, ID = 0.9A, TJ = +25°C - - 0.58 Ω VIN = 100Vrms - - 145 W VIN = 120Vrms - - 190 W Drain Leakage Current On - State Resistance Output Power Maximum Off Time Minimum Pulse Duration for Input of Quasi- Resonant Signals Minimum Off Time Feedback Threshold Voltage rDS(ON) POUT 45 - 55 µs tw(th) Drain Waveform High, Note 1 - - 1.0 µs toff Drain Waveform High, Note 1 - - 1.5 µs Drain Waveform Low to High, Note 1 0.68 0.73 0.78 V Oscillator Synchronized, Note 2 1.30 1.45 1.60 V 1.20 1.35 1.50 mA - - 400 µA toff Drain Waveform High VFDBK Over - Current Protection/Feedback Sink Current IOCP/FB VOCP/FB = 1.0V Latch Holding Current IIN(OVP) VIN Reduced from 24.5V to 8.5V Latch Release Voltage VIN 6.6 - 8.4 V - - 250 ns IIN(ON) Operating, Note 3 - - 30 mA IIN(OFF) Increasing VIN Prior to Oscillation - - 100 µA 2000 - - V 140 - - °C tf Supply Current Insulation RMS Voltage Thermal Shutdown IIN ≤ 20µA, VIN Reduced from 24.5V VDD = 200V, ID = 0.9A Switching Time VWM(RMS) All Terminals Simultaneous reference to a Metal Plate Against the backside TJ Note 1. Feedback is square wave, VIM = 2.2V, th = 1µs, tl = 35µs. Note 2. For quasi - resonant operation, the input signal must be longer than tw(th) and greater than VFDBK. Note 3. Feedback is square wave, VIM = 2.2V, th = 4µs, tl = 1µs. Pin Connection Diagram (Front View) 5 GND 4 Supply 3 Drain 2 Source 1 Overcurrent & Feedback .217 (5.5) .614 (15.6) .136 (3.45) .217 (5.5) .126 (3.2) Dia 1 .905 (23.0) 5 .275 (7.0) .217 (5.5) .100 (2.54) .177 (4.5)