NTE7002
Integrated Circuit
Switched Mode Power Supply Control
Description:
The NTE7002 is a bipolar integrated circuit in a 9–Lead SIP type package that drives, regulates, and
monitors the switching transistor in a power supply based on the ringing choke flyback principle.
Due to the wide regulating range and the high voltage stability during large load changes, SMPS for
Hi–Fi equipment and active loudspeakers can be realized as well as applications in TV receivers and
video recorders.
Features:
D
Wide Operational Range
D
High Voltage Stability Even at High Load Changes
D
Direct Control of Switching Transistor
D
Low Start–Up Current
D
Linear Foldback of the Overload Characteristic
D
Base Drive Proportional to the Current Through the Power Switching Transistor
D
Stand–By Mode 3.5W into the External Load
D
Inhibit Capability (TTL Compatible)
D
Undervoltage Lockout
Absolute Maximum Ratings:
Supply Voltage, V
9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Sink Output Voltage
V
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V
9
V
V
7
–V
8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
±6V
Reference Output, I
1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 to +1.0mA
Zero Crossing, I
2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –3.0 to +3.0mA
Control Amplifier, I
3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –3.0 to 0mA
Collector Current, I
4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2.0 to +5.0mA
Trigger Input, I
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2.0 to +3.0mA
Sink Output, I
7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1.5A
Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C
Thermal Resistance, Junction–to–Ambient, R
thJA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +70°C/W
Thermal Resistance, Junction–to–Case, R
thJC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15°C/W
Electrical Characteristics (Cont’d):
(T
A
= +25°C unless otherwise specified)
Parameter
External Trigger Input
Supply Voltage Disabling
V
8
amd V
1
V
Pin5
Zener Voltage
I
Pin5
Turn–On Time (Secondary Voltages)
Voltage Change
Stand–By Operation
(Minimum Secondary Power: 3W)
Switching Frequency During
Stand–By Mode
Primary Power Consumption
During Stand–By Mode
Symbol
V
5
V1
9
V
5
I
5
t
on
∆V
2
∆V
2
f
P
prim
The Heat Sink Must Be Opti-
mized, Taking the Maximum
Data (T
J
, R
ΘJC
, T
A
) into
Consideration
S
3
= Closed,
∆P
3
= 19W
S
2
= Closed,
∆P
2
= 15W
S
1
= Open
Pin5 Open
V
Pin5
= 3.0V
V
Pin5
= 0V
Test Conditions
Enable Voltage, V
reg
= 0V
Disable Voltage, V
reg
= 0V
Min
–
2.0
6.7
6.5
–
–
–
–
–
–
70
–
Typ
2.2
2.2
7.4
7.3
1.4
–11
350
100
500
20
75
10
Max
2.4
–
7.8
7.8
–
–
450
500
1000
30
–
15
V
kHz
VA
ms
mV
V
V
µA
Unit
V
Protective Operation (Cont’d)
(V
9
= 15V, T
A
= +25°C)
Pin Connection Diagram
(Front View)
9
8
7
6
5
4
3
2
1
V
CC
Source Output
Sink Output
GND
Shut Down
Sawtooth Generator
Feedback
Zero Detection
Reference
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