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NTE1672 Integrated Circuit Power Supply Control Circuit
Description: The NTE1672 is a control circuit in a 16-Lead DIP type package designed for use in switched mode power supplies. This single monolithic chip incorporates all the control and housekeeping (protection) functions required in switched mode power supplies, including an internal temperature compensated reference source, internal Zener references, sawtooth generator, pulse width modulator, output stage, and various protection circuits. Features: D Stabilized Power Supply D Temperature Compensated Reference Source D Sawtooth Generator D Pulse Width Modulator D Remote ON/OFF Switching D Current Limiting
D D D D D D
Low Supply Voltage Protection Loop Fault Protection Demagnetization/Overvoltage Protection Maximum Duty Cycle Clamp Feed Forward Control External Synchronization
Absolute Maximum Ratings: Supply Voltage Forced Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V Current Fed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA Output Transistor (at 20 - 30V Max) Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA Collector Voltage (Pin15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC +1.4V Maximum Emitter Voltage (Pin14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V Operating Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to +70C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C DC Electrical Characteristics: (TA = +25C, VCC = 12V unless otherwise specified)
Parameter Reference Sections Internal Reference Voltage (Vref) Temperature Coefficient of Vref Internal Zener Reference (VZ) Temperature Coefficient of VZ IL = -7mA Test Conditions TA = +25C TA = 0 to +70C Min 3.57 3.53 - 7.8 - Typ 3.72 - -100 8.4 200 Max 3.95 4.00 - 8.8 - Unit V V ppm/C V ppm/C
DC Electrical Characteristics (Cont'd): (TA = +25C, VCC = 12V unless otherwise specified)
Parameter Oscillator Section Frequency Range Initial Accuracy Oscillator Duty Cycle Range Modulator Modulation Input Current Housekeeping Function Pin6, Input Current Pin6, Duty Cycle Limit Control Pin1, Low Supply Voltage Protection Thresholds Pin3, Feedback Loop Protection Trip Threshold Pin3, Pull-Up Current at 2V Pin13, Demagnetization/Over Voltage TA = 0 to +70C Protection Trip on Threshold Pin13, Input Current Pin16, Feed Forward Duty Cycle Control Pin16, Feed Forward Input Current (Note 1) External Synchronization Pin9 OFF Pin9 ON Pin9 Sink Current Remote Pin10 OFF Pin10 ON Pin10 Sink Current Current Limiting Pin11, IIN Single Pulse Inhibit Delay Trip Level: Shut Down, Slow Start, Low Level Current Limit, High Level Low Level in terms of High Level at = 0V, TA = +25C at = 0V, TA = 0 to +70C at = 250mV, TA = +25C at = 250mV, TA = 0 to +70C Inhibit Delay Time for 20% Overdrive at 40mA IOUT Voltage at Pin9 = 0V, TA = +25C Voltage at Pin9 = 0V, TA = 0 to +70C at 250mV, TA = +25C at 250mV, TA = 0 to +70C Voltage at Pin16 = 2VZ at 16V, VCC = 18V, TA = +25C at 16V, VCC = 18V, TA = 0 to +70C Test Conditions TA = 0 to +70C R = 5k fo = 20kHz Voltage at Pin5 = 2V TA = 0 to +70C at 2V, TA = 0 to +70C For 50% Maximum Duty Cycle, 15kHz to 50kHz/41% of VZ Min 50 - 0 - - 40 8.0 400 -7 470 - - 30 - - 0 2 - - 0 2 - - - - - 0.56 0.40 0.75 Typ - 5 - 0.2 0.2 50 9.0 600 -15 600 -0.6 - 40 0.2 - - - -65 - - - -85 - -2 - 0.7 0.60 0.48 0.80 Max 100k - 98 20 20 60 10.5 720 -35 720 -10 -20 50 5.0 10 0.8 VZ -125 -125 0.8 VZ -125 -125 -20 -40 0.8 0.70 0.50 0.85 Unit Hz % % A A % of Duty Cycle V mV A mV A A % Original Duty Cycle A A V V A A V V A A A A s V V V
Note 1. Does not include current for timing resistors or capacitors.
DC Electrical Characteristics (Cont'd): (TA = +25C, VCC = 12V unless otherwise specified)
Parameter Error Amplifier Output Voltage Swing (VOH) Output Voltage Swing (VOL) Open Loop Gain Feedback Resistor Small Signal Bandwidth Output Stage VCE(sat) IC = 40mA Output Current (Pin15) Maximum Emitter Voltage (Pin14) Supply Voltage/Current ICC IZ = 0, Voltage Forced, VCC = 12V, TA = +25C IZ = 0, Voltage Forced, VCC = 12V, TA = 0 to +70C VCC ICC = 10mA Current Fed ICC = 30mA Current Fed Test Conditions Min 6.2 - 54 10k - - 40 5 - - 19 20 Typ - - 60 - 3 - - 6 - - - - Max 9.5 0.7 - - - 0.5 - - 10 15 24 30 Unit V V dB MHz V mA V mA mA V V
Pin Connection Diagram
VCC 1 VZ 2 Feedback 3 Gain 4 Modulation 5 Duty Cycle Control 6 RT 7 CT 8
16 Feed Forward 15 Output (Collector) 14 Output (Emitter) 13 Demagnetization/Overvoltage 12 GND 11 Current Limiting 10 Remote ON/OFF 9 External Sync
16
9
.260 (6.6) Max
1
8
.785 (19.9) Max
.300 (7.62)
.200 (5.08) Max .245 (6.22) Min
.100 (2.54) .700 (17.7)

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