NTE NTE7044

NTE7044
Integrated Circuit
Switching Regulator Control Circuit
Description:
The NTE7044 is an integrated circuit in a 9–Lead SIP type package which contains a PWM switching
regulator control circuit and protect circuit on a single chip.
Features:
D Soft Start Circuit
D 0 to 0.7 Duty
D Protection Circuit for Overvoltage and Current
D External Trigger Available
D High Supply Voltage Protection
D Low Supply Voltage Protection
D Reference Voltage Provided by an External Zener Diode
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V
Circuit Voltage
V6–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 14.4V
V1, V2, V4–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V6–5
V3–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3V to 10V
V7–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 8V
V8, V9–5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –3V to +4V
Supply Current, I6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18mA
Circuit Current, I4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1mA to +50mApeak
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260mW
Local Power Dissipation (Q1), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60mW
Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C
Storage Temperatuere Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C
Note 1. + is flow–in current to the circuit, while – is flow–out current.
Electrical Characteristics: (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter
Min
Typ
Max
Unit
Itot
8.4
10.5
12.6
mA
fOSC
14.0
14.8
15.6
kHz
Output Pulse Duty (Min)
tw(duty)
67
72
77
%
Output Pulse Duty (Max)
tw(duty)
–
0
0
%
Total Circuit Current
Oscillation Frequency
Symbol
Test Conditions
Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter
Symbol
Output Saturation Voltage
VO(sat)
Test Conditions
Min
Typ
Max
Unit
I4 = 10mA
–
0.10
0.30
V
I4 = 50mA
–
0.62
1.00
V
High Supply Voltage Protection
VHVP
13.2
13.9
14.6
V
Low Supply Voltage Protection
VLVP
4.8
5.2
5.6
V
Input Voltage, External Trigger Start
Vt1
0.66
0.71
0.76
V
Input Voltage, One–Shot Multi Start
Vt2
0.68
0.73
0.78
V
Pin Connection Diagram
(Front View)
9 Protector
8 Trigger
7 Soft Start
6 VCC
5 GND
4 Output
3 Oscillator
2 Feedback
1 Reference Voltage
.929 (23.6)
.118 (3.0)
.236
(6.0)
1
9
.098
(2.5)
.100 (2.54)
.118(3.0)