NTE1672 Datasheet, PDF (1/4 Pages) NTE Electronics – Integrated Circuit Power Supply Control Circuit

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 Low Supply Voltage Protection
D Temperature Compensated Reference Source D Loop Fault Protection
D Sawtooth Generator
D Demagnetization/Overvoltage Protection
D Pulse Width Modulator
D Maximum Duty Cycle Clamp
D Remote ON/OFF Switching
D Feed Forward Control
D Current Limiting
D 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V_CC +1.4V
Maximum Emitter Voltage (Pin14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V
Operating Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
DC Electrical Characteristics: (T_A = +25°C, V_CC = 12V unless otherwise specified)
Parameter
Test Conditions
Min Typ Max
Reference Sections
Internal Reference Voltage (V_ref)
Temperature Coefficient of V_ref
Internal Zener Reference (V_Z)
T_A = +25°C
T_A = 0° to +70°C
I_L = –7mA
3.57 3.72 3.95
3.53 – 4.00
– –100 –
7.8 8.4 8.8
Temperature Coefficient of V_Z
– 200 –
Unit
V
V
ppm/°C
V
ppm/°C