NTE1672 PDF даташит
Спецификация NTE1672 изготовлена «NTE» и имеет функцию, называемую «Integrated Circuit Power Supply Control Circuit». |
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Детали детали
Номер произв | NTE1672 |
Описание | Integrated Circuit Power Supply Control Circuit |
Производители | NTE |
логотип |
4 Pages
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NTE1672
Integrated Circuit
Power Supply Control Circuit
Description:
The NTE1672 is a control circuit in a 16–Lead DIP type package designed for use in switched mode
power supplies. This single monolithic chip incorporates all the control and housekeeping (protection)
functions required in switched mode power supplies, including an internal temperature compensated
reference source, internal Zener references, sawtooth generator, pulse width modulator, output
stage, and various protection circuits.
Features:
D Stabilized Power Supply
D Low Supply Voltage Protection
D Temperature Compensated Reference Source D Loop Fault Protection
D Sawtooth Generator
D Demagnetization/Overvoltage Protection
D Pulse Width Modulator
D Maximum Duty Cycle Clamp
D Remote ON/OFF Switching
D Feed Forward Control
D Current Limiting
D External Synchronization
Absolute Maximum Ratings:
Supply
Voltage Forced Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +18V
Current Fed Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
Output Transistor (at 20 – 30V Max)
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA
Collector Voltage (Pin15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC +1.4V
Maximum Emitter Voltage (Pin14) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V
Operating Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
DC Electrical Characteristics: (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter
Test Conditions
Min Typ Max
Reference Sections
Internal Reference Voltage (Vref)
Temperature Coefficient of Vref
Internal Zener Reference (VZ)
TA = +25°C
TA = 0° to +70°C
IL = –7mA
3.57 3.72 3.95
3.53 – 4.00
– –100 –
7.8 8.4 8.8
Temperature Coefficient of VZ
– 200 –
Unit
V
V
ppm/°C
V
ppm/°C
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DC Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter
Test Conditions
Min Typ Max
Unit
Oscillator Section
Frequency Range
Initial Accuracy Oscillator
TA = 0° to +70°C
R = 5kΩ
50 – 100k
–5–
Hz
%
Duty Cycle Range
Modulator
Modulation Input Current
Housekeeping Function
Pin6, Input Current
fo = 20kHz
0 – 98
Voltage at Pin5 = 2V TA = 0° to +70°C – 0.2 20
at 2V, TA = 0° to +70°C
– 0.2 20
%
µA
µA
Pin6, Duty Cycle Limit Control
For 50% Maximum Duty Cycle,
15kHz to 50kHz/41% of VZ
Pin1, Low Supply Voltage Protection
Thresholds
40 50 60 % of Duty
Cycle
8.0 9.0 10.5
V
Pin3, Feedback Loop Protection Trip
Threshold
400 600 720
mV
Pin3, Pull–Up Current
at 2V
Pin13, Demagnetization/Over Voltage TA = 0° to +70°C
Protection Trip on Threshold
–7 –15 –35
470 600 720
µA
mV
Pin13, Input Current
Pin16, Feed Forward Duty Cycle
Control
at 250mV, TA = +25°C
at 250mV, TA = 0° to +70°C
Voltage at Pin16 = 2VZ
– –0.6 –10
µA
– – –20
µA
30 40 50 % Original
Duty Cycle
Pin16, Feed Forward Input Current
(Note 1)
External Synchronization
Pin9 OFF
at 16V, VCC = 18V, TA = +25°C
at 16V, VCC = 18V, TA = 0° to +70°C
– 0.2 5.0
– – 10
0 – 0.8
µA
µA
V
Pin9 ON
Pin9 Sink Current
Remote
Pin10 OFF
2 – VZ
Voltage at Pin9 = 0V, TA = +25°C
– –65 –125
Voltage at Pin9 = 0V, TA = 0° to +70°C –
– –125
0 – 0.8
V
µA
µA
V
Pin10 ON
Pin10 Sink Current
Current Limiting
Pin11, IIN
Single Pulse Inhibit Delay
Trip Level: Shut Down, Slow Start,
Low Level
at = 0V, TA = +25°C
at = 0V, TA = 0° to +70°C
2 – VZ
– –85 –125
– – –125
at = 250mV, TA = +25°C
at = 250mV, TA = 0° to +70°C
Inhibit Delay Time for 20% Overdrive
at 40mA IOUT
– –2 –20
– – –40
– 0.7 0.8
0.56 0.60 0.70
V
µA
µA
µA
µA
µs
V
Current Limit, High Level
0.40 0.48 0.50
V
Low Level in terms of High
Level
0.75 0.80 0.85
V
Note 1. Does not include current for timing resistors or capacitors.
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DC Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 12V unless otherwise specified)
Parameter
Test Conditions
Min Typ Max
Unit
Error Amplifier
Output Voltage Swing (VOH)
Output Voltage Swing (VOL)
Open Loop Gain
6.2 – 9.5
– – 0.7
54 60 –
V
V
dB
Feedback Resistor
10k –
–
Ω
Small Signal Bandwidth
–3–
MHz
Output Stage
VCE(sat) IC = 40mA
Output Current (Pin15)
– – 0.5
40 –
–
V
mA
Maximum Emitter Voltage (Pin14)
56–
V
Supply Voltage/Current
ICC
VCC
IZ = 0, Voltage Forced,
VCC = 12V, TA = +25°C
IZ = 0, Voltage Forced,
VCC = 12V, TA = 0° to +70°C
ICC = 10mA Current Fed
ICC = 30mA Current Fed
– – 10
– – 15
19 – 24
20 – 30
mA
mA
V
V
Pin Connection Diagram
VCC 1
VZ 2
Feedback 3
Gain 4
Modulation 5
Duty Cycle Control 6
RT 7
CT 8
16 Feed Forward
15 Output (Collector)
14 Output (Emitter)
13 Demagnetization/Overvoltage
12 GND
11 Current Limiting
10 Remote ON/OFF
9 External Sync
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