View NTE7154_525002.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

NTE7154 Integrated Circuit Control Circuit for Switch Mode Power Supplies using MOS Transistors
Description: The NTE7154 is an integrated circuit in an 8-Lead DIP type package which controls the MOS power transistor and performs all necessary regulation and monitoring functions in free running flyback converters. Since good load regulation over a wide load range is attained, this device is particularly suitable for consumer as well as industrial power supplies. Features: D Fold-Back Characteristic Provides Overload Protection for External Diodes D Burst Operation Under Short-Circuit and No Load Conditions D Loop Error Protection D Switch-Off In Case of Too Low Line Voltage (Under Voltage Switch-Off) D Line Voltage Compensation of Overload Point D Soft-Start for Smooth Start-Up D Chip Over-Temperature Protection (Thermal Shutdown) D On-Chip Parasitic Transformer Oscillation Suppression Circuitry D Decrease of Regulated Voltage for Low Power Consumption Absolute Maximum Ratings: Supply Voltage (Pin1), V1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +3.0V Supply Voltage (Pin2, Pin3, Pin4, Pin7), V2, V3, V4, V7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V Supply Voltage (Pin6), V6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +20V Supply Current (Pin1, Pin2, Pin3, Pin7), I1, I2, I3, I7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3mA Supply Current (Pin4, Note 1), I4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.5A Supply Current (Pin5, Note 1), I5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to +1.5A Supply Current (Pin6, Note 1), I6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A Supply Current (Pin8), I8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -3 to +3mA Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125C Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +125C Thermal Resistance, Junction-to-Ambient, RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85C/W Thermal Resistance, Junction-to-Case, RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45C/W Note 1. tp 50s, V 0.1.
Electrical Characteristics: (VCC = 10V, TA = +25C unless otherwise specified)
Parameter Start-Up Hysteresis Start-Up Current Drain Switch-On Voltage Switch-Off Voltage Switch-On Current Switch-Off Current Voltage Clamp (V6 = 10V, IC Switched Off) At Pin2 (V6 < V6E) At Pin3 (V6 < V6E) Control Range Control Input Voltage Voltage Gain of the Control Circuit in the Control Range Primary Current Simulation Voltage Basic Value VsB V2O DV2 V2S V1 = V1R = 10mV V2O - V2B V1 = 0 0.955 1.000 1.030 V V1R -VR VR = d(V2S - V2B)/dV1, f = 1kHz 400 - 410 43 420 - mV dB V2(Max) V3(Max) I2 = 1mA I3 = 1mA 5.6 5.6 6.6 6.6 9.0 9.0 V V I6E0 V6E V6A I6E1 I6A1 V6 = V6E V6 = V6A V6 = V6E - 11 4.5 - - 0.6 12 5.0 11 10 0.8 13 5.5 - - mA V V mA mA Symbol Test Conditions Min Typ Max Unit
Overload Range and Short Circuit Operation Peak Value in the Range of Secondary Overload Maximum Ramp Amplitude Peak value in the Range of Secondary Short-Circuit Operation Foldback Point Correction Foldback Point Correction Current -I2 V8P V8N V8S TUL -I8 VSatU VSatU V8 = 0 I5 = -0.1A I5 = +0.1A I5 = +0.5A Output Slow Rate Rising Edge Falling Edge Reduction of Control Voltage Current to Reduce the Control Voltage -I1 V7 = 1V - 50 - A +dV5/dt -dV5/dt - - 70 100 - - V/s V/s V3 = 3.7V I8 = 1mA I8 = -1mA 300 500 650 A V V mV s V V V V 2.80 1.82 2.3 2.95 1.95 2.5 3.10 2.08 2.7 V V V
Generally Valid Data (V6 = 10V) Voltage of the Zero Transition Detector Positive Clamping Voltage Negative Clamping Voltage Threshold Voltage Suppression of Transformer Ringing Input Current - - 40 3.0 0 0.75 -0.2 50 3.8 - - - - 4.5 4
Push-Pull Output Stage Saturation Voltages Pin5 Sourcing Pin5 Sinking - - - 1.5 1.0 1.4 2.0 1.2 1.8
Electrical Characteristics (Cont'd): (VCC = 10V, TA = +25C unless otherwise specified)
Parameter Protection Circuit Undervoltage Protection for V6: Voltage at Pin5 = V5(min) if V6 < V6(Min) Overvoltage Protection for V6: Voltage at Pin5 = V5(min) if V6 > V6(Min) Undervoltage Protection for VAC: Voltage at Pin5 = V5(min) if V3 < V3A Over Temperature: At the given chip temperature the IC will switch V5 to V5(Min) Voltage at Pin3 if one of the protection functions was triggered; (V3 will be clamped until V6 < V6A) Current Drain During Burst Operation V6(Min) V6(Max) V3A Oj V3Sat I3 = 750A V2 = 0V 7.00 15.0 970 - - 7.25 16.0 1005 150 0.4 7.50 16.5 1040 - 0.8 V V mV C V Symbol Test Conditions Min Typ Max Unit
I6
V3 = V2 = 0V
-
8
-
mA
Pin Connection Diagram
Regulation Input 1 Primary Current Simulation 2 Primary Voltage Monitoring 3 GND 4
8 Zero Crossing Detector Input 7 Soft-Start 6 Supply Voltage 5 Output
8
5
.260 (6.6) Max
1
4
.430 (10.92) Max .200 (5.08)
.300 (7.62)
.100 (2.54) .300 (7.62)
.125 (3.18) Min

▲Up To Search▲

Price & Availability of NTE7154

	To Download NTE7154 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .