NTE1672
Integrated Circuit
Power Supply Control Circuit
Description:
The NTE1672 is a control circuit in a 16鈥揕ead 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
Temperature Compensated Reference Source
D
Sawtooth Generator
D
Pulse Width Modulator
D
Remote ON/OFF Switching
D
Current Limiting
D
D
D
D
D
D
Low Supply Voltage Protection
Loop Fault Protection
Demagnetization/Overvoltage Protection
Maximum Duty Cycle Clamp
Feed Forward Control
External Synchronization
Absolute Maximum Ratings:
Supply
Voltage Forced Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V
Current Fed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
Output Transistor (at 20 鈥?30V Max)
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA
Collector Voltage (Pin15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
CC
+1.4V
Maximum Emitter Voltage (Pin14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V
Operating Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0擄 to +70擄C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
DC Electrical Characteristics:
(T
A
= +25擄C, V
CC
= 12V unless otherwise specified)
Parameter
Reference Sections
Internal Reference Voltage (V
ref
)
Temperature Coefficient of V
ref
Internal Zener Reference (V
Z
)
Temperature Coefficient of V
Z
I
L
= 鈥?mA
Test Conditions
T
A
= +25擄C
T
A
= 0擄 to +70擄C
Min
3.57
3.53
鈥?/div>
7.8
鈥?/div>
Typ
3.72
鈥?/div>
鈥?00
8.4
200
Max
3.95
4.00
鈥?/div>
8.8
鈥?/div>
Unit
V
V
ppm/擄C
V
ppm/擄C
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