NTE1721 NTE Electronics, Inc., NTE1721 Datasheet
NTE1721
Manufacturer Part Number
NTE1721
Description
Regulator; Pulse Width Modulator; DIP; 50 mA; 5.1 V (Typ.); 35 V (Max.)
Manufacturer
NTE Electronics, Inc.
Type
Pulse Width Modulator Regulator, Voltage Referencer
Datasheet
1.NTE1721.pdf
(4 pages)
Specifications of NTE1721
Common Mode Rejection Ratio
75
Current, Input Bias
1 μA
Current, Output
50 μA
Current, Supply
14 mA
Frequency, Oscillator
400 kHz
Load Regulation
20 mV (Typ.)
Package Type
DIP-16
Power Dissipation
1000 mW
Regulation, Line
10 mV
Regulation, Load
20 mV
Regulator Type
Switching
Resistance, Thermal, Junction To Case
60 °C/W
Temperature, Operating
0 to 70 °C
Temperature, Operating, Range
0 to +70 °C
Time, Fall
50 ns
Time, Rise
100 ns
Type, Voltage Regulator
Pulse Width Modulator
Voltage Noise, Output
40 μV (RMS) (Typ.)
Voltage, Noise
40 μV
Voltage, Offset
2 mV
Voltage, Output
5.1 V
Voltage, Output, High
5.6 V
Voltage, Output, Low
0.2 V
Voltage, Rating
35 V (Max.)
Voltage, Supply
35 V
Voltage, Supply, Rejection Ratio
60 dB
Lead Free Status / Rohs Status
RoHS Compliant part
Description:
The NTE1721 and NTE1723 are pulse width modulator control–circuits designed to offer improved
performance and lowered external parts count when implemented for controlling all types of switching
power supplies. The no–chip +5.1V reference is trimmed to 1% and the input common–mode range
of the errror amplifier includes the reference voltage, thus eliminating the need for external divider
resistors. A sync input to the oscillator enables multiple units to be slaved or a single unit to be syn-
chronized to an external system clock. A wide range of dead time can be programmed by a single
resistor connected between the C
soft–start circuitry, requiring only an external timing capacitor. A shutdown pin controls both the soft–
start circuitry and the output stages, provided instantaneous turn–off through the PWM latch with
pulsed shutdown, as well as soft–start recycle with longer shutdown commands. The under voltage
lockout inhibits the outputs and the changing of the soft–start capacitor when V
The output stages are totem–pole design capable of sinking and sourcing in excess of 200mA. The
output stages of the NTE1721 features NOR logic resulting in a low output for an off state while the
NTE1723 utilizes OR logic which gives a high output when off.
Features:
D 8V to 35V Operation
D +5.1V 1% Trimmed Reference
D 100Hz to 400kHz Oscillator Range
D Separate Oscillator Sync Pin
D Adjustable Dead Time Control
Absolute Maximum Ratings: (Note 1)
Supply Voltage, V
Collector Supply Voltage, V
Logic Inputs
Analog Inputs
Output Current, Source or Sink, I
Reference Output Current, I
Oscillator Charging Current
Power Dissipation (T
Power Dissipation (T
Operating Junction Temperature, T
Storage Temperature Range, T
Thermal Resistance, Junction–to–Ambient, R
Thermal Resistance, Junction–to–Case, R
Lead Temperature (During Soldering, 10sec), T
Note 1 Values beyond which damage may occur
Derate Above 50 C
Derate Above 25 C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
Pulse Width Modulator (PWM) Regulator
A
C
= +25 C), P
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
= +25 C), P
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C
ref
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
O
T
D
NTE1721 & NTE1723
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
J
and the Discharge pins. These devices also feature a built–in
Integrated Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
thJC
thJA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
L
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D Input Undervoltage Lockout
D Latching PWM to Prevent Multiple Pulses
D Pulse–by–Pulse Shutdown
D Dual Source/Sink Outputs:
CC
is below nominal.
–55 to +125 C
–0.3V to +5.5V
400mA Peak
–0.3V to V
10mW/ C
16mW/ C
1000mW
2000mW
100 C/W
60 C/W
+150 C
+300 C
500mA
50mA
+40V
+40V
5mA
CC
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NTE1721 Summary of contents
Page 1
... V The output stages are totem–pole design capable of sinking and sourcing in excess of 200mA. The output stages of the NTE1721 features NOR logic resulting in a low output for an off state while the NTE1723 utilizes OR logic which gives a high output when off. ...
Page 2
Recommended Operating Conditions: Supply Voltage Collector Supply Voltage Output Sink/Source Current Steady State Peak Reference Load Current Oscillator Frequency Range Oscillator Timing Resistor Oscillator Timing Capacitor Deadtime Resistor Range Operating Ambient Temperature Range Electrical Characteristics: (V Parameter Reference Section Reference ...
Page 3
... Fall Time Shutdown Delay Supply Current Note 3.Applies to NTE1721 Only, due to polarity of output pulses. Application Information (Shutdown Options): Since both the compensation and soft–start terminals (Pin9 and Pin8) have current source pull–ups, either can readily accept a pull–down signal which only has to sink a maximum of 100 A to turn off the outputs ...
Page 4
Pin Connection Diagram Invert Input 1 Non–Invert Input 2 Sync 3 OSC Output Discharge 7 Soft–Start .870 (22.0) Max .100 (2.54) .700 (17.78 ref ...