NTE7002 Integrated Circuit Switched Mode Power Supply Control Description: The NTE7002 is a bipolar integrated circuit in a 9–Lead SIP type package that drives, regulates, and monitors the switching transistor in a power supply based on the ringing choke flyback principle. Due to the wide regulating range and the high voltage stability during large load changes, SMPS for Hi–Fi equipment and active loudspeakers can be realized as well as applications in TV receivers and video recorders. Features: D Wide Operational Range D High Voltage Stability Even at High Load Changes D Direct Control of Switching Transistor D Low Start–Up Current D Linear Foldback of the Overload Characteristic D Base Drive Proportional to the Current Through the Power Switching Transistor D Stand–By Mode 3.5W into the External Load D Inhibit Capability (TTL Compatible) D Undervoltage Lockout Absolute Maximum Ratings: Supply Voltage, V9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Sink Output Voltage V7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V9V V7–V8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±6V Reference Output, I1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 to +1.0mA Zero Crossing, I2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –3.0 to +3.0mA Control Amplifier, I3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –3.0 to 0mA Collector Current, I4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2.0 to +5.0mA Trigger Input, I5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2.0 to +3.0mA Sink Output, I7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1.5A Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Thermal Resistance, Junction–to–Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +70°C/W Thermal Resistance, Junction–to–Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15°C/W Electrical Characteristics: (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Supply Voltage V9 – 15 18 V Ambient Temperature TA –15 – +85 °C V9 = 3.0V – – 0.5 mA V9 = 5.0V – 1.5 2.0 V9 = 10V – 2.0 3.2 Start Operation (TA = +25°C) Current Consumption (V1 Not Yet Switched) I9 Turn–On Point for V1 V9 11.3 11.8 12.3 V V4 Before Start–Up (V9 < 11.8V) V4 6.0 6.7 – V Vreg = –10V 110 135 160 mA Vreg = 0 55 85 110 I1 < 0.1mA 4.0 4.2 4.5 I1 = 5.0mA 4.0 4.2 4.4 TC1 – 100 – ppm/°C V4 1.8 2.08 2.5 V IPin3 = 5.0µA 4.0 4.2 4.5 V IPin3 = 1.3mA – 2.4 3.0 IPin3 = 1.3mA – 3.7 4.0 VPin3 Fold Back IPin3 = 0.5mA – 2.5 3.0 VPin3 Overload Decision IPin3 = 1.0µA – 2.4 2.9 – 2.11 – – 1.0 – VPin3 = 1.5V – 0.4 – VR = 0V (Full Fold Back) – 3.5 – VR = –10V (Regulation) – 4.0 – VR = –15V (Stand–By) – 5.0 – VR = 0V – 1.4 – VR = –10V – 1.45 – VR = –15V – 1.57 – Regulation Mode (V9 = 15V, TA = +25°C) Current Consumption Reference Voltage Reference Voltage Temperature Coefficient VPin4 Low Static Voltage VPin4 Regulation Peak Voltage VPin3 Full Fold Back I9 V1 V4(peak) V3 VPin3 Regulation VPin3 IPin3 Regulation I3 VPin3 IPin3 Leakage VPin7 Peak High VPin7 Peak Low V7(peak) V7(peak) V V µA V V IPin7 Sink Peak I7(peak) VR = –15V – +0.7 – A IPin8 Source Peak I8(peak) VR = –15V – –0.8 – A IPin2 = –3.0mA – –0.3 – V IPin2 = –0.3mA – –0.2 – IPin2 = +3.0mA – +0.7 – IPin2 = +0.3mA – +0.8 – VPin2 V2 Protective Operation (V9 = 15V, TA = +25°C) Current Consumption I9 V5 < 1.8V 14 20 26 mA Turn–Off Voltage V7 V5 < 1.8V 1.3 1.5 1.8 V 1.8 2.1 2.5 V4 Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Enable Voltage, Vreg = 0V – 2.2 2.4 V Disable Voltage, Vreg = 0V 2.0 2.2 – 6.7 7.4 7.8 V 6.5 7.3 7.8 V µA Protective Operation (Cont’d) (V9 = 15V, TA = +25°C) External Trigger Input Supply Voltage Disabling V8 amd V1 VPin5 Zener Voltage IPin5 V5 V19 V5 Pin5 Open I5 VPin5 = 3.0V – 1.4 – VPin5 = 0V – –11 – – 350 450 ms S3 = Closed, ∆P3 = 19W – 100 500 mV S2 = Closed, ∆P2 = 15W – 500 1000 S1 = Open – 20 30 V 70 75 – kHz – 10 15 VA Turn–On Time (Secondary Voltages) ton Voltage Change ∆V2 Stand–By Operation (Minimum Secondary Power: 3W) Switching Frequency During Stand–By Mode Primary Power Consumption During Stand–By Mode ∆V2 f Pprim The Heat Sink Must Be Optimized, Taking the Maximum Data (TJ, RΘJC, TA) into Consideration Pin Connection Diagram (Front View) 9 VCC 8 Source Output 7 Sink Output 6 GND 5 Shut Down 4 Sawtooth Generator 3 Feedback 2 Zero Detection 1 Reference .897 (23.0) .874 (22.2) .143 (3.65) .135 (3.54) .377 (9.6) .260 (6.6) 1 .100 (2.54)Typ 9 .106 (2.7) .165 (4.2) Min ALL Dimensions are Max.