NTE7098 & NTE7099
Integrated Circuit
Current Mode Pulse Width Modulator (PWM)
Control Circuit
Description:
The NTE7098 and NTE7099 are integrated circuits in 8鈥揕ead DIP type packages that incorporate a
new precision temperature鈥揷ontrolled oscillator to minimize variations in frequency. An internal
toggle flip鈥揻lop, which blanks the output off every other clock cycle, limits the duty鈥揷ycle range to less
than 50%. An under鈥搗oltage lockout ensures that V
REF
is stabilized before the output stage is en-
abled.
Other features include low start鈥搖p current, pulse鈥揵y鈥揷urrent limiting, and high鈥揷urrent 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鈥揷hannel devices.
Features:
D
Optimized for Off鈥揕ine Control
D
Temperature Compensated Oscillator
D
50% Maximum Duty鈥揅ycle Clamp
D
V
ref
Stabilized before Output Stage is Enabled
D
Low Start鈥揢p Current
D
Pulse鈥揵y 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
鹵1A
Output Energy (Capacitive Load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5碌J
Analog Inputs (V
FB
, V
SENSE
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3V to V
CC
Error Amp Output Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
1
2
3
