NTE1729
Integrated Circuit
Pulse Width Modulator (PWM) Control Circuit
Description:
The NTE1729 is an inverter control unit in a 16鈥揕ead DIP type package which provides all the control
circuitry for PWM type switching regulators. Included in this device is the voltage reference, dual error
amplifiers, oscillator, pulse width modulator, pulse steering flip flop, dual alternating output switches,
and dead time control.
Features:
D
Complete PWM Power Control Circuit
D
Adjustable Dead Time: 0 to 100%
D
No Double Pulsing of Same Output during Load Transient Condition
D
Dual Error Amplifiers have Wide Common Mode Input Voltage Capability: 鈥?.3V to V
CC
鈥?V
D
Circuit Architecture Provides Easy Synchronization
D
Uncommitted Outputs for 250mA Sink or Source
D
With Miss鈥揙peration Prevention Circuit for Low Level Supply Voltage
Absolute Maximum Ratings:
(T
A
= +25擄C unless otherwise specified)
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41V
Error Amplifier Input Voltage, V
ICM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
CC
+0.3V
Output Voltage, V
CER
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41V
Total Power Dissipation (T
A
= +25擄C), P
T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +85擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Recommended Operating Conditions:
Parameter
Supply Voltage
Output Voltage
Output Current
Error Amplifier Sink Current
Timing Capacitor
Timing Resistance
Oscillation Frequency
Operating Temperature
Symbol
V
CC
V
CER
I
C
I
OAMP
C
T
R
T
f
osc
T
opt
Min
7
鈥?.3
鈥?/div>
鈥?/div>
0.47
1.8
1
鈥?0
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Max
40
40
200
鈥?.3
10000
500
300
+70
Unit
V
V
mA
mA
nF
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