LND494

Features:

• Complete PWM Circuitry Power Control
• Uncommitted Outputs for 200mA Sink or source current
• Output Control Selects Single-Ended or Push-Pull operation
• Internal Circuitry Prohibits Double Pulse at Either Output
• Variable Dead-Time Provides a stable 5-V Reference Supply, 5%
• Circuit Architecture Allows Easy Synchronization




Pinout






Specifications

Rating	Value	Unit
Supply voltage, Vcc	41	V
Amplifier input voltage	Vcc+0.3
Collector output voltage	41
Collector output current	250	mA
Operating free-air temperature range	0 to 70
Storage temperature range	-65 to 150
Lead temperature 1,6 mm from case for 10 seconds	260

Description

The LND494 incorporate on a single monolithic chip all the functions required in the construction of a pulse-width-modulation control circuit.

Designed primarily for power supply control, these devices offer the systems engineer the flexibility to tailor the power supply control circuitry to his application. The LND494 contains an error amplifier, an on-chip adjustable oscillator, a dead time control comparator, pulse steering control flip-flop, a 5- volt, 5% precision regulator, and output-control circuits. The error amplifier exhibits a commonmode voltage range from 0.3 volts to Vcc-2 volts. The dead-time control compactor has a fixed offset that provides approximately 5% dead time when externally altered. The on-chip oscillator may be by passed by terminating R_T (pin 6) to the reference output and providing a sawtooth input to C_T (pin 5), or it may be used to drive the common circuits in synchronous multiple-rail power supplies. The uncommitted output transistors provide either common-emitter or emitter-follower output capability. Each device provides for push-pull or single-ended output operation, which may be selected through the output-control function. The architecture of these devices prohibits the possibility of either output being pulsed twice during push-pull operation.