7159

NTE7159
Integrated Circuit
Switch Mode Power Supply Controller
Description:
The NTE7159 is a monolithic integrated circuit in a 16–Lead DIP type package designed for use as
the primary part of an off–line switching mode power supply. All functions required for SMPS control
under normal operating, transient or abnormal conditions are provided.
The capability of working according to the “master–slave” concept, or according to the “primary regulation”
mode makes the NTE7159 very flexible and easy to use. This is particularly true for TV receivers where
the IC provides an attractive and low cost solution (no need of stand–by auxiliary power supply).
Features:
D Positive and Negative Current Up To 1.2A and –2A
D Low Start–Up Current
D Direct Drive of the Power Transistor
D Two Levels Transistor Current Limitation
D Double Pulse Suppression
D Soft–Starting
D Under and Overvoltage Lock–Out
D Automatic Stand–By Mode Recognition
D Large Power Range Capability in Stand–By (Burst Mode)
D Internal PWM Signal Generator
Absolute Maximum Ratings:
Power Supply (V16–V4, V5, V12, V13), VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Output Stage Power Supply (V15–V4, V5, V12, V13), V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Output Current, IOUT
Positive (Source Current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Negative (Sink Current) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.5A
Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
StorageTemperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C
Thermal Resistance, Junction–to–Case (Note 1), RthJC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11°C/W
Thermal Resistance, Junction–to–Ambient (Note 1), RthJA . . . . . . . . . . . . . . . . . . . . . . . . . . . 45°C/W
Note 1. Soldered on a 35µm, 40cm2 board copper area.
Recommended Operating Conditions:
Parameter
Symbol
Min
Typ
Max
Unit
VCC
VCCstop
12
VCCmax
V
Positive Output Current (Source Current)
IOUT+
–
–
1.2
A
Negative Output Current (Sink Current)
IOUT–
–
–
2.0
A
Average Positive Output Current
IOUT+
–
–
0.6
A
Average Negative Output Current
IOUT–
–
–
0.6
A
Operating Frequency
Foper
10
–
100
kHz
VIN
1.5
2.5
4.5
V
Oscillator Resistor Range
ROSC
20
–
150
kΩ
Oscillator Capacitor Range
COSC
0.47
–
4.7
nF
Soft–Starting Capacitor Range
C1
0.047
1.0
–
µF
Overload Integration Capacitor
C2
0.047
1.0
–
µF
Ratio C2/C1 (C2 must be ≥ C1)
C2/C1
1
–
–
Operating Ambient Temperature
TA
–20
–
+70
Power Supply
Input Pulses Amplitude (Pin2)
°C
Electrical Characteristics: (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Power Supply
Starting Voltage
VCC(start)
VCC increasing
9.3
10.3
11.3
V
Stopping Voltage
VCC(stop)
VCC decreasing
6.4
7.4
8.4
V
Hysteresis
Hyst VCC VCC(start) – VCC(stop)
2.4
2.9
–
V
Starting Current
ICC(start)
VCC = 9V
–
0.7
1.4
mA
Supply Current
ICC
VCC = 12V
–
7.5
15.0
mA
15.0
15.7
–
V
VCC = 17V
26
35
42
mA
ROSC = 68kΩ, COSC = 1nF
–
10
–
%
Overvoltage Threshold on VCC
VCC(max)
Supply Current After Overvoltage Detection
ICC(over)
Oscillator/PWM Section
Accuracy
∆F/F
Error Amplifier Section
Open Loop Gain
AVO
–
75
–
dB
Unity Gain Frequency
Fug
–
550
–
kHz
Short Circuit Output Current
ISC
Pin7 Connected to GND
–
2
–
mA
E Input Bias Current
IBE
Pin6
–
0.08
–
µA
Connected to Error Amplifier
Input and Not Directly Accessible
2.34
2.49
2.64
V
Internal Voltgage Reference
VREF
Input Section
IN Input Threshold
VIN
Pin2
0.60
0.85
1.20
V
IS Input Threshold
VIS
Pin1
–
0.15
–
V
IN Input Bias Current
IBIN
–
0.3
–
µA
IS Input Bias Current
IBIS
–
0.4
–
µA
Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Current Limitation Section
First Current Limitation Threshold
VIM1
558
600
642
mV
Second Current Limitation Threshold
VIM2
837
900
963
mV
Thresholds Difference
∆VIM
–
300
–
mV
Lock–Out Threshold on Pin2
VC2
2.25
2.55
2.85
V
Capacitor C2 Discharge Current
IDC2
–
10
–
µA
Capacitor C2 Charge Current
ICC2
–
45
–
µA
Maximum Input Bias Current
IBI(max)
–
0.2
–
µA
VIM2 – VIM1
Pin3
Pin Connection Diagram
Transformer Demagnetizatin 1
Sensing Input
Secondary Pulses Input 2
Power Transistor Current 3
Limitation Input
GND 4
16 Power Supply
15 Positive Output Stage Supply
14 Power Output
13 GND
GND 5
12 GND
Error Amplifier Input (Inverting) 6
11 Oscillator Resistor
Error Amplifier Output 7
10 Oscillator Capacitor
Overload Integration Capacitor 8
9 Soft–Start Capacitor
16
9
1
8
.787 (20.0) Max
.280 (7.1)
.201
(5.1)
.100 (2.54)
.130 (3.3) Min
.335 (8.5)