NTE7117 PDF даташит
Спецификация NTE7117 изготовлена «NTE Electronics» и имеет функцию, называемую «Integrated Circuit Switched-Mode Power Supply Controller». |
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Детали детали
Номер произв | NTE7117 |
Описание | Integrated Circuit Switched-Mode Power Supply Controller |
Производители | NTE Electronics |
логотип |
2 Pages
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NTE7117
Integrated Circuit
Switched–Mode Power Supply Controller
Description:
The NTE7117 is a control circuit in an 8–Lead DIP type package designed for use in switched–mode
power supplies. It contains an internal temperature–compensated supply, PWM, sawtooth oscillator,
over–current sense latch, and output stage. This device is intended for low cost SMPS applications
where extensive housekeeping functions are not required.
Features:
D Pulse Width Modulator
D Current Limiting (Cycle–by–Cycle)
D Sawtooth Generator
D Stabilized Power Supply
D Double–Pulse Protection
D Internal Temperature–Compensated Reference
Applications:
D Switch–Mode Power Supplies
D DC Motor Controller Inverter
D DC/DC Converter
Absolute Maximum Ratings:
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40mA
Output Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98%
Maximum Total Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750mW
Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
DC Electrical Characteristics: (VCC = 12V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Reference Section
Internal Reference Voltage
Internal Zener Reference
Temperature Coefficient of VREF
Temperature Coefficient of VZ
Oscillator Section
VREF
VZ
TA = +25°C
TA = 0° to +70°C
IL = 7mA
3.69 3.75 3.84 V
3.66 – 3.87 V
7.8 8.2 8.8
V
– ±100 – ppm/°C
– ±100 – ppm/°C
Frequency Range
Initial Accuracy
Duty Cycle Range
f TA = 0° to +70°C
RT and CT Constant
fo = 20kHz
50 – 100k Hz
–5–
%
0 – 98 %
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DC Electrical Characteristics (Cont’d): (VCC = 12V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Current Limiting
Input Current
Single Pulse Inhibit Delay
Current Limit Trip Level
IIN Pin6 = 250mV
TA = +25°C
– –2 –10 µA
TA = 0° to +70°C –
– –20 µA
Inhibit Delay Time IOUT = 20mA
for 20% Overdrive IOUT = 40mA
– 0.88 1.10
– 0.7 0.8
µs
µs
0.4 0.5 0.6
V
Error Amplifier
Open–Loop Gain
– 60 –
dB
Feedback Resistor
10k –
–
Ω
Small–Signal Bandwidth
BW
– 3 – MHz
Output Voltage Swing, High
Output Voltage Swing, Low
Output Stage
VOH
VOL
6.2 –
–
– – 0.7
V
V
Output Current
Saturation Voltage
Supply Voltage/Current
IOUT
VCE
TA = 0° to +70°C
TA = 0° to +70°C
IC = 20mA
IC = 40mA
20 – – mA
– – 0.4 V
– – 0.5 V
Supply Current
Supply Voltage
Low Supply Protection
ICC IZ = 0,
Voltage–Fed
TA = +25°C
TA = 0° to +70°C
–
–
– 10
– 13
VCC IS = 10mA, Current–Fed
19 21 24
ICC = 30mA, Current–Fed
20 – 30
mA
mA
V
V
Pin1 Threshold
8.0 9.0 10.5 V
Pin Connection Diagram
VCC 1
VZ 2
Feedback 3
Gain 4
8 GND
7 Output
6 Current Sense
5 RT, CT
85
.256 (6.52) Max
14
.393 (10.0)
Max
.150
(3.81)
.300
(7.62)
.100
(2.54)
.300 (7.62)
.070 (1.77) Min
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