NTE7002
Integrated Circuit
Switched Mode Power Supply Control
Description:
The NTE7002 is a bipolar integrated circuit in a 9Lead 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
HiFi 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 StartUp Current
D
Linear Foldback of the Overload Characteristic
D
Base Drive Proportional to the Current Through the Power Switching Transistor
D
StandBy 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, JunctiontoAmbient, R
thJA
+70
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Thermal Resistance, JunctiontoCase, R
thJC
+15
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics (Cont'd): (T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Protective Operation (Cont'd) (V
9
= 15V, T
A
= +25
C)
External Trigger Input
V
5
Enable Voltage, V
reg
= 0V
2.2
2.4
V
Disable Voltage, V
reg
= 0V
2.0
2.2
Supply Voltage Disabling
V
8
amd V
1
V1
9
6.7
7.4
7.8
V
V
Pin5
Zener Voltage
V
5
Pin5 Open
6.5
7.3
7.8
V
I
Pin5
I
5
V
Pin5
= 3.0V
1.4
A
V
Pin5
= 0V
11
TurnOn Time (Secondary Voltages)
t
on
350
450
ms
Voltage Change
V
2
S
3
= Closed,
P
3
= 19W
100
500
mV
S
2
= Closed,
P
2
= 15W
500
1000
StandBy Operation
(Minimum Secondary Power: 3W)
V
2
S
1
= Open
20
30
V
Switching Frequency During
StandBy Mode
f
70
75
kHz
Primary Power Consumption
During StandBy Mode
P
prim
The Heat Sink Must Be Opti-
mized, Taking the Maximum
Data (T
J
, R
JC
, T
A
) into
Consideration
10
15
VA
Pin Connection Diagram
V
CC
Zero Detection
Sawtooth Generator
Reference
Feedback
GND
Sink Output
Source Output
9
8
7
6
5
Shut Down
4
3
2
1
(Front View)
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