NTE7239

NTE7239 Integrated Circuit Positive Adjustable Voltage Regulator, 5A, 1.2V to 32V TO220 Type Package Description: The NTE7239 is an adjustable 3terminal positive voltage regulator in a TO200 type package capa- ble of supplying in excess of 5A over a 1.2V to 32V output range. A unique feature of this device is timedependent current limiting, which allows peak current up to 12A to be drawn from the regulator for short periods of time. his allows the NTE7239 to be used with heavy transient loads and speeds startup under fullload conditions. Under sustained loading conditions, the current limit decreases to a safe value protecting the regulator. Also included on th chip are thermal overload protection, and safe area protection for the power transistor. Overload protection remains functional even if the ad- justment pin is accidentally disconnected. Normally, no capacitors are needed unless the device is situated more than 6 inches from the input filter capacitors in which case an input bypass is needed. An output capacitor can be added to improve transient response, while bypassing the adjustment pin will increase th regulators ripple rejection. Besides replacing fixed regulators o discrete designs, the NTE7239 is useful in a wide variety of other applications. Since the regulator is floating and sees only the input tooutput differential voltage, supplies of several hundred volts can be regulated as long as the maximum input to output differential is not exceeded, i.e., do not shortcircuit output to ground. Features: Specified 7A Peak Output Current Specified 5A Output Current Adjustable Output Down to 1.2V Specified Thermal Regulation Current Limit Constant with Temperature Output is Short Circuit Protected Applications: Adjustable Power Supplies Constant Current Regulators Battery Chargers Absolute Maximum Ratings: (Note 1) Power Dissipation ...................................................... Internally Limited Input/Output Voltage Differential .............................................. +40V, 0.3V Note 1. Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics.Absolute Maximum Ratings (Contd): (Note 1) Operating Temperature Range ............................................... 0 to +125C Storage Temperature Range ............................................... 65 to +150C Lead Temperature (During Soldering, 4 sec) ........................................ +260 C Typical Thermal Resistance, Junction toAmbient (No Heat Sink), R .............. 50 C/W thJA Maximum Thermal Resistance, Junction toCase, R .............................. 4 C/W thJC Note 1. Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is intended to be functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. Electrical Characteristics: (T = +25C, V = V = 5V, I = 10mA, Note 2 unless otherwise J IN OUT OUT specified) Parameter Symbol Test Conditions Min Typ Max Unit Reference Voltage V 3V (V V ) 35V, 10mA I 5A, 1.19 1.24 1.29 V REF IN OUT OUT P 50W, 0 T +125 C J Line Regulation V 0.005 0.03 %/V 3V (V V ) 35V, RLINE IN OUT Note 3 0 T +125 C 0.02 0.06 %/V J Load Regulation V 10mA I 5A 0.1 0.5 % RLOAD OUT 0 T +125 C 0.3 1.0 % J Thermal Regulation 20ms Pulse 0.002 0.02 %/W Adjustment Pin Current I 0 T +125 C 45 100 A ADJ J Adjustment Pin Current I 3V (V V ) 35V, 10mA I 5A, 0.2 5.0 A ADJ IN OUT OUT Change 0 T +125 C J Temperature Stability V 0 T +125 C 1 % R/T J Minimum Load Current I (Min) V V = 35V, 0 T +125 C 3.5 10 mA LOAD IN OUT J Current Limit DC I V V 10V, 0 T +125 C 5 8 A CL IN OUT J 0.5ms Peak 7 12 A Current Limit I V V = 30V 1 A CL IN OUT RMS Output Noise, V 10Hz f 10kHz 0.003 % N %of V OUT Ripple Rejection Ratio V /V V = 10V, f = 120Hz, C = 0F 60 dB R IN OUT ADJ 0 T +125 C J C = 10F 60 75 dB ADJ LongTerm Stability T = +125C, 1000 hrs 0.3 1.0 % J Note 2. These specifications are applicable for power dissipation up to 25W. Power dissipation is specified up to 15V input output differential. Above 15V differential, power dissipation will be limited by internal protection circuitry. Note 3. Regulation is measured at a constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specifica- tion for thermal regulation.