NTE7117 Datasheet, PDF (1/2 Pages) NTE Electronics – Integrated Circuit Switched-Mode Power Supply Controller

NTE7117
Integrated Circuit
Switched–Mode Power Supply Controller
Description:
The NTE7117 is a control circuit in an 8–Lead DIP type package designed for use in switched–mode
power supplies. It contains an internal temperature–compensated supply, PWM, sawtooth oscillator,
over–current sense latch, and output stage. This device is intended for low cost SMPS applications
where extensive housekeeping functions are not required.
Features:
D Pulse Width Modulator
D Current Limiting (Cycle–by–Cycle)
D Sawtooth Generator
D Stabilized Power Supply
D Double–Pulse Protection
D Internal Temperature–Compensated Reference
Applications:
D Switch–Mode Power Supplies
D DC Motor Controller Inverter
D DC/DC Converter
Absolute Maximum Ratings:
Supply Voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Output Current, I_OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA
Output Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98%
Maximum Total Power Dissipation, P_D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW
Operating Temperature Range, T_A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
DC Electrical Characteristics: (V_CC = 12V, T_A = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Reference Section
Internal Reference Voltage
Internal Zener Reference
Temperature Coefficient of V_REF
Temperature Coefficient of V_Z
Oscillator Section
V_REF
V_Z
T_A = +25°C
T_A = 0° to +70°C
I_L = 7mA
3.69 3.75 3.84 V
3.66 – 3.87 V
7.8 8.2 8.8
V
– ±100 – ppm/°C
– ±100 – ppm/°C
Frequency Range
Initial Accuracy
Duty Cycle Range
f T_A = 0° to +70°C
R_T and C_T Constant
f_o = 20kHz
50 – 100k Hz
–
5
–
%
0
– 98
%