NTE7044

NTE7044 Integrated Circuit Switching Regulator Control Circuit Description: The NTE7044 is an integrated circuit in a 9–Lead SIP type package which contains a PWM switching regulator control circuit and protect circuit on a single chip. Features: D Soft Start Circuit D 0 to 0.7 Duty D Protection Circuit for Overvoltage and Current D External Trigger Available D High Supply Voltage Protection D Low Supply Voltage Protection D Reference Voltage Provided by an External Zener Diode Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V Circuit Voltage V6–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 14.4V V1, V2, V4–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V6–5 V3–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 10V V7–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 8V V8, V9–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –3V to +4V Supply Current, I6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18mA Circuit Current, I4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1mA to +50mApeak Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260mW Local Power Dissipation (Q1), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mW Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperatuere Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Note 1. + is flow–in current to the circuit, while – is flow–out current. Electrical Characteristics: (TA = +25°C, VCC = 12V unless otherwise specified) Parameter Total Circuit Current Oscillation Frequency Output Pulse Duty (Min) Output Pulse Duty (Max) Symbol Itot fOSC tw(duty) tw(duty) Test Conditions Min 8.4 14.0 67 – Typ 10.5 14.8 72 0 Max 12.6 15.6 77 0 Unit mA kHz % % Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified) Parameter Output Saturation Voltage Symbol VO(sat) VHVP VLVP Vt1 Vt2 Test Conditions I4 = 10mA I4 = 50mA High Supply Voltage Protection Low Supply Voltage Protection Input Voltage, External Trigger Start Input Voltage, One–Shot Multi Start Min – – 13.2 4.8 0.66 0.68 Typ 0.10 0.62 13.9 5.2 0.71 0.73 Max 0.30 1.00 14.6 5.6 0.76 0.78 Unit V V V V V V Pin Connection Diagram (Front View) 9 Protector 8 Trigger 7 Soft Start 6 VCC 5 GND 4 Output 3 Oscillator 2 Feedback 1 Reference Voltage .929 (23.6) .118 (3.0) .236 (6.0) 1 9 .098 (2.5) .100 (2.54) .118(3.0)