NTE1678 Integrated Circuit Switching Regulator for TV Description: The NTE1687 is a switching regulator integrated circuit in a 14–Lead DIP type package especially designed for TV sets. This device can be used for both types of TV sets, insulated type and non–insulated types. The NTE1687 operates in synchronizing with the horizontal retrace pulse, so it does not generate any visual noise in the picture on the CRT. The output transistor in the powersupply circuit is protected doubly by the internal protection circuit for over load. The ON/OFF operation of the power supply is able to operate easily without any mechanical relay using the provided terminal, so timer operation, remote control, etc. are very easy. Features: D Wide range of regulating input line voltage: AC 80V to 280V D The output power transistor is doubly protected by the current limitter and the shut down circuit D No visual noise due to horizontal synchronous operation D A terminal for remote control, timer operation and etc. of the power supply is provided D Shut down circuit is easily resetable using ON/OFF terminal D Low stand–by and starting current Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Current, I8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA Sink of Output Terminal, I7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Input Voltages of Current Limitter, V5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.0V Input Voltage ON/OFF Circuit, V4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8V Sink of ON/OFF Circuit, I3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5mA Input Voltages of Duty Limit Circuit, V2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8 V External Oscillation Resistor, RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5kΩ to ∞ External Oscillation Capacitor, CO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0µF to 1µF Input Voltage of Error Amplifier, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8 V Reference Voltage, V14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8 V Drain of Error Amplifier, I13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2mA to 0mA Input Voltage of Shut Down Circuit, V12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8 V Integration Voltage of Shut Down Circuit, V6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V8 V Power Dissipation (TA = +75°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150mW Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Electrical Characteristics: (TA = +25°C unless otherwise specified) Parameter Supply Terminal Voltage Thermal Drift of V8 Starting Supply Current Symbol V8 dV8(TA) I8 Test Conditions Min Typ Max Unit 6.1 6.6 7.1 V Difference of Min. and Max.of V8 in TA from –20° to +75°C – – 200 mV V8 = 3V, Pin7: Open – 1.0 1.5 mA V8 = 3V, Pin7: GND – 3.0 4.2 mA I8 = 12mA Starting Pulse Height P7(S) V8 = 3V, Pin7: Open, Pin6: GND 1.5 2.3 3.0 Vpp Starting Supply Terminal Voltage V8(S) Pin7: Open, Pulse of Pin7 = 1.5Vp–p 2.0 2.6 3.0 V Starting Oscillation Frequency fo(S) V8 = 3V, Pin10: Open 10 13 20 kHz Output Pulse Height P7 Pin7: Open, Pin6: GND 5.0 6.0 7.1 Vp–p Drain of Output Pin I7 Pin7: GND, V2 = V8 –6.3 –5.0 –3.7 mA – – 0.3 V I5 = 100µA –700 –500 –300 µA V5 = 0.8V –700 –500 –300 µA Saturation Voltage of Output Pin Integration Pin Current V7(sat) I6(1) I7 = 5mA Leak of Integration Pin I6L V5 = 0.3V –10 – 0 µA Trigger Voltage of Shut Down Circuit V6T P7 < 100mVp–p 2.5 – 3.5 V Drain of Duty Limit Terminal I2 V2 = 3V –20 – 0 µA Pulse Width set by Pin 2 Voltage PL V = 2.33V, Frequency: 15.75kHz, Low Level Period 25 30 35 µs – – 2 µs Thermal Drift of PL dPL(TA) V2 = 2.33V, Difference of Min & Max. of PL in TA from –20° to +75°C ON Voltage of Pin 4 V4(ON) I3 = 3mA, V3 = 0.3V 1.5 2.5 3.5 V ON Current of Pin 4 I4(ON) I3 = 3mA, V3 = 0.3V – – 200 µA Output Saturation of ON/OFF Circuit V3(Sat) I3 = 3mA, V4 = 3.5V – – 300 mV V4 = 1.5V, V3 = V8 – – 1 µA Leak of ON/OFF Output I3L Offset Voltage of Error Amplifier V(OS) Absolute Value – 8 20 mV Opened Gain of Error Amplifier AVO f: 1kHz, Signal of Pin13: 1Vp–p 45 53 80 dB Current of Pin1 I1 Pin1: GND – – –10 µA Current of Pin14 I14 Pin14: GND – – –10 µA Maximum Voltage of Error Amplifier Output V13(Max) V1 = 3.5V, V14 = 3.0V 5.0 5.7 – V Minimum Voltage of Error Amplifier Output V13(Min) V1 = 2.5V, V14 = 3.0V – 50 300 mV Sink of Error Amplifier Output I13 V1 = 2.5V, V14 = 3.0V, V13 = 3.0V 50 100 250 µA Free Running Oscillation Amplitude Vfo Pin10: Open Vso 3.3 4.0 Vp–p V8 = 3.0V 0.5 1.5 – Vp–p Pin10: Open 12.3 13.3 14.3 kHz – – 500 Hz 2.7 3.0 3.3 Vp–p – – 150 V Starting Oscillation Amplitude Free Running Oscillation Frequency Thermal Drift of fo Synchronous Oscillation Amplitude Thermal Drift of VSO Vfo(S) fo dfo (TA) Vso dVso(TA) Pin10: Open, Difference of Min & Max of f in TA from –20° to +75°C Synchronous Frequency: 15.75kHz Difference of Min & Max of Vso in TA from –20° to +75°C Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified) Parameter Symbol High Level of Oscillation Test Conditions Min Typ Max Unit – 3.8 4.5 V 1.0 1.8 – V – – 100 mV Oscillation is Synchronizing (15.75kHz) –1.0 – +0.3 V Oscillation is Synchronizing (15.75kHz) –200 –40 – µA VOH Starting VOH VOH(s) Thermal Drift of VOH V8 = 3.0V dVOH(TA) Difference of Min & Max of VOH in TA from –20° to+75°C Synchronous Signal Voltage VS Pin Connection Diagram Error Voltage Input 1 14 Reference Voltage Input Duty Limit 2 13 Error Amp Output ON/OFF Output 3 12 Comparator Input ON/OFF Input 4 11 OSC Current Limit 5 10 Synchronization Shutdown 6 9 GND 8 VCC Pulse Output 7 14 8 1 7 .827 (21.0) Max .300 (7.62) .197 (5.0) Max .100 (2.45) .099 (2.5) Min .600 (15.24) .100 (2.54) .025 (0.65) .099 (2.5) .012 (0.30)