NTE1722
Integrated Circuit
Pulse Width Modulator (PWM) Control Circuit
Description:
The NTE1722 is a high performance pulse width modulator integrated circuit in an 18鈥揕ead DIP type
package intended for fixed frequency switching regulators and other power control applications.
Functions included in this IC are a temperature compensated voltage reference, sawtooth oscillator,
error amplifier, pulse width modulator, pulse metering and steering logic, and two high current totem
pole outputs ideally suited for driving the capacitance of power FETs at high speeds.
Additional protective features include soft start and undervoltage lockout, digital current limiting,
double pulse inhibit, adjustable dead time and a data latch for single pulse metering. All digital control
ports art TTL and B鈥搒eries CMOS compatible. Active low logic design allows easy wired鈥揙R connec-
tions for maximum flexibility. The versatility of this device enables implementation in single鈥揺nded
or push鈥損ull switching regulators that are transformerless or transformer coupled.
Features:
D
8.0 to 35 Volt Operation
D
5.0 Volt
鹵1%
Trimmed Reference
D
1.0Hz to 400kHz Oscillator Range
D
Dual Source/Sink Current Outputs:
鹵100mA
D
Digital Current Limiting
D
Programmable Dead Time
D
Wide Current Limit Common Mode Range
D
Guaranteed 6 Unit Synchronization
Absolute Maximum Ratings:
(Values beyond which damage may occur)
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Collector Supply Voltage, V
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3 to +5.5V
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.3 to V
CC
V
Output Current (Source or Sink), I
O
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
鹵200mA
Reference Load Current (V
CC
= 40V, Note 1), I
ref
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Logic Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA
Power Dissipation (T
A
= +25擄C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
Derate Above 50擄C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mW/擄C
Power Dissipation (T
C
= +25擄C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000mW
Derate Above 25擄C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24mW/擄C
Operating Junction Temperature, T
J
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . + 150擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Thermal Resistance, Junction鈥搕o鈥揂mbient, R
thJA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100擄C/W
Lead Temperature (During Soldering, 10sec), T
L
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
鹵300擄C
Note 1. Maximum junction temperature must be observed.
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