NTE966

NTE966 Integrated Circuit 3 Terminal Positive Voltage Regulator, 12V The NTE966 fixed voltage regulator is a monolithic integrated circuit in a TO220 type package de- signed for use in a wide variety of applications including local, oncard regulation. This regulator em- ploys internal current limiting, thermal shutdown, and safearea compensation. With adequate heat- sinking it can deliver output currents in excess of 1.0 ampere. Features: Output Current in Excess of 1.0 Ampere No External Components Reguired Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor SafeArea Compensation Absolute Maximum Ratings: (T = +25C unless otherwise specified) A Input Voltage, V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Vdc in Power Dissipation (T = +25C), P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited A D Derate above +25 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15.4mW/ C Power Dissipation (T = +25C), P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Internally Limited C D Derate above +75 C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mW/ C Thermal Resistance, JunctiontoAmbient, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 C/W thJA Thermal Resistance, Junction toCase, R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 C/W thJC Operating Junction Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 to +150C J Storage Junction Temperature Range, T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to +150C stg Electrical Characteristics: (V = 19V, I = 500mA, T = 0 to +125 C unless otherwise specified) in O J Parameter Symbol Test Conditions Min Typ Max Unit Output Voltage V T = +25C 11.5 12.0 12.5 V O J 5mA I 1A, P 15W, 14.5V V 27V 11.4 12.0 12.6 V O O in Line Regulation Reg T = +25C, Note 1 14.5V V 20V 13 240 mV line J in 16V V 22V 6 120 mV in Load Regulation Reg T = +25C, Note 1 5mA I 1.5A 45 160 mV load J O 250mA I 750mA 16 80 mV O Note 1. Load and line regulation are specified at constant junction temperature. Changes in V due O to heating effects must be taken into account separately. Pulse testing with low duty cycle is used.Electrical Characteristics (Contd): (V = 19V, I = 500mA, T = 0 to +125 C unless otherwise in O J specified) Parameter Symbol Test Conditions Min Typ Max Unit Quiescent Current I T = +25C 4.4 8.0 mA B J Quiescent Current Change I 14.5V V 30V 1.0 mA B in 5mA I 1A 0.5 mA O Ripple Rejection RR 15V V 25V, f = 120Hz 60 dB in Dropout Voltage V V T = +25C, I = 1A 2 V in O J O Output Noise Voltage V T = +25C, 10Hz f 100kHz 10 V/V n A O Output Resistance r f = 1kHz 18 m O ShortCircuit Current Limit I T = +25C, V = 35V 0.2 A sc A in Peak Output Current I T = +25C 2.2 A max J Average Temperature Coefficient TCV 1.0 mV/C O of Output Voltage Application Information: The NTE966 fixedvoltage regulator is designed with Thermal Overload Protection that shuts down the circuit when subjected to an excessive power overload condition, Internal ShortCircuit Protection that limits the maximum current the circuit will pass, and Output Transistor SafeArea Compensation that reduces the output short circuit current as the voltage across the pass transistor is increased. In many low current applications, compensation capacitors are not required. However, it is recom- mended that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire lengths, or if the output load capacitor is large. An input bypass capacitor should be selected to provide good highfrequency characteristics to insure stable operation under all load conditions. A 0.33F or larger tantalum, mylar, or other capacitor having low internal imped- ance at high frequencies should be chosen. The bypass capacitor should be mounted with the short- est possible leads directly across the regulators input terminals. Normally good construction tech- niques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense leads. Current Regulator Adjustable Output Regulator Output NTE966 NTE966 Input 0.33F R Constant 7 Current to Grounded Load 2 0.33F 0.1 F I O 6 NTE941 3 10k 1k 4 The NTE966 regulator can also be used as a current source when connected as above. Resistor R determines the current as follows: 5V V 7V to 20V O, I =+ I O Q R V V 2V IN O I 1.5mA over line and load changes Q The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtainable with this arrangement is 2 For example, a 1ampere current source would require R to be a 5, 10W resistor and the output voltage compliance would be the input voltage less 7 volts. volts greater than the regulator voltage.