NTE7239

NTE7239 Integrated Circuit Positive Adjustable Voltage Regulator, 5A, 1.2V to 32V TO−220 Type Package Description: The NTE7239 is an adjustable 3−terminal positive voltage regulator in a TO−200 type package capable of supplying in excess of 5A over a 1.2V to 32V output range. A unique feature of this device is time−dependent 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 start−up under full−load 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 adjustment 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 regulator’s 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−to−output 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 short−circuit output to ground. Features: D Specified 7A Peak Output Current D Specified 5A Output Current D Adjustable Output Down to 1.2V D Specified Thermal Regulation D Current Limit Constant with Temperature D Output is Short−Circuit Protected Applications: D Adjustable Power Supplies D Constant Current Regulators D 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 (Cont’d): (Note 1) Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +125C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to +150C Lead Temperature (During Soldering, 4 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C Typical Thermal Resistance, Junction−to−Ambient (No Heat Sink), RthJA . . . . . . . . . . . . . . 50C/W Maximum Thermal Resistance, Junction−to−Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4C/W 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: (TJ = +25C, VIN = VOUT = 5V, IOUT = 10mA, Note 2 unless otherwise specified) Parameter Reference Voltage Line Regulation Load Regulation Symbol Test Conditions Min Typ Max Unit VREF 3V  (VIN − VOUT)  35V, 10mA  IOUT  5A, P  50W, 0  TJ  +125C 1.19 1.24 1.29 V − 0.005 0.03 %/V − 0.02 0.06 %/V − 0.1 0.5 % − 0.3 1.0 % 20ms Pulse − 0.002 0.02 %/W VRLINE VRLOAD 3V  (VIN − VOUT)  35V, Note 3 0  TJ  +125C 10mA  IOUT  5A 0  TJ  +125C Thermal Regulation Adjustment Pin Current IADJ 0  TJ  +125C − 45 100 A Adjustment Pin Current Change IADJ 3V  (VIN − VOUT)  35V, 10mA  IOUT  5A, 0  TJ  +125C − 0.2 5.0 A Temperature Stability VR/T 0  TJ  +125C − 1 − % − 3.5 10 mA 5 8 − A 7 12 − A Minimum Load Current Current Limit DC ILOAD(Min) VIN − VOUT = 35V, 0  TJ  +125C ICL VIN − VOUT  10V, 0  TJ  +125C 0.5ms Peak Current Limit ICL VIN − VOUT = 30V − − 1 A RMS Output Noise, %of VOUT VN 10Hz  f  10kHz − 0.003 − % CADJ = 0F − 60 − dB CADJ = 10F 60 75 − dB − 0.3 1.0 % Ripple Rejection Ratio Long−Term Stability VR/VIN VOUT = 10V, f = 120Hz, 0  TJ  +125C TJ = +125C, 1000 hrs 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 specification for thermal regulation. .420 (10.67) Max .110 (2.79) .147 (3.75) Dia Max .500 (12.7) Max .250 (6.35) Max .500 (12.7) Min .070 (1.78) Max Adjust .100 (2.54) VIN VOUT/Tab