NTE7098 Datasheet, PDF (1/3 Pages) NTE Electronics – Integrated Circuit Current Mode Pulse Width Modulator (PWM) Control Circuit

NTE7098 & NTE7099
Integrated Circuit
Current Mode Pulse Width Modulator (PWM)
Control Circuit
Description:
The NTE7098 and NTE7099 are integrated circuits in 8–Lead DIP type packages that incorporate a
new precision temperature–controlled oscillator to minimize variations in frequency. An internal
toggle flip–flop, which blanks the output off every other clock cycle, limits the duty–cycle range to less
than 50%. An under–voltage lockout ensures that V_REF is stabilized before the output stage is en-
abled.
Other features include low start–up current, pulse–by–current limiting, and high–current totem pole
output for driving capacitive loads, such as the gate of a power MOSFET. The output is low in the
off state, consistent with N–channel devices.
Features:
D Optimized for Off–Line Control
D Temperature Compensated Oscillator
D 50% Maximum Duty–Cycle Clamp
D V_ref Stabilized before Output Stage is Enabled
D Low Start–Up Current
D Pulse–by Pulse Current Limiting
D Improved U/V Lockout
D Double Pulse Suppression
D 1% Trimmed Bandgap Reference
D High Current Totem Pole Output
Absolute Maximum Ratings:
Supply Voltage (I_CC < 30mA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Self Limiting
Supply Voltage (Low Impedence Source) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30V
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±1A
Output Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5µJ
Analog Inputs (V_FB, V_SENSE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to V_CC
Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA