NTE1729

Integrated Circuit

Pulse Width Modulator (PWM) Control Circuit

Description:

The NTE1729 is an inverter control unit in a 16–Lead 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 Circuit Architecture Provides Easy Synchronization

D Uncommitted Outputs for 250mA Sink or Source

D With Miss–Operation Prevention Circuit for Low Level Supply Voltage

41V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

41V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1000mW

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–20

° to +85°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

–65

° to +150°C

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Recommended Operating Conditions:

Parameter

Symbol

Min

Typ

Max

Unit

Supply Voltage

7

–

40

V

Output Voltage

–0.3

–

40

V

Output Current

–

–

200

mA

Error Amplifier Sink Current

–

–

–0.3

mA

Timing Capacitor

0.47

–

10000

nF

Timing Resistance

1.8

–

500

k

Ω

Oscillation Frequency

1

–

300

kHz

Operating Temperature

–20

–

+70

°C