NTE7154
Integrated Circuit
Control Circuit for Switch Mode Power Supplies
using MOS Transistors
Description:
The NTE7154 is an integrated circuit in an 8鈥揕ead DIP type package which controls the MOS power
transistor and performs all necessary regulation and monitoring functions in free running flyback con-
verters. Since good load regulation over a wide load range is attained, this device is particularly suit-
able for consumer as well as industrial power supplies.
Features:
D
Fold鈥揃ack Characteristic Provides Overload Protection for External Diodes
D
Burst Operation Under Short鈥揅ircuit and No Load Conditions
D
Loop Error Protection
D
Switch鈥揙ff In Case of Too Low Line Voltage (Under Voltage Switch鈥揙ff)
D
Line Voltage Compensation of Overload Point
D
Soft鈥揝tart for Smooth Start鈥揢p
D
Chip Over鈥揟emperature Protection (Thermal Shutdown)
D
On鈥揅hip Parasitic Transformer Oscillation Suppression Circuitry
D
Decrease of Regulated Voltage for Low Power Consumption
Absolute Maximum Ratings:
Supply Voltage (Pin1), V
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3 to +3.0V
Supply Voltage (Pin2, Pin3, Pin4, Pin7), V
2
, V
3
, V
4
, V
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3V
Supply Voltage (Pin6), V
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3 to +20V
Supply Current (Pin1, Pin2, Pin3, Pin7), I
1
, I
2
, I
3
, I
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3mA
Supply Current (Pin4, Note 1), I
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.5A
Supply Current (Pin5, Note 1), I
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.5 to +1.5A
Supply Current (Pin6, Note 1), I
6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
Supply Current (Pin8), I
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥? to +3mA
Operating Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +125擄C
Ambient Temperature Range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +85擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +125擄C
Thermal Resistance, Junction鈥搕o鈥揂mbient, R
thJA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85擄C/W
Thermal Resistance, Junction鈥搕o鈥揅ase, R
thJC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45擄C/W
Note 1. t
p
1
2
3
