IL494A_09 Datasheet, PDF (1/9 Pages) IK Semicon Co., Ltd – PWM Control Circuit

TECHNICAL DATA
PWM Control Circuit
The IL494 incorporates 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, the IL494 contains an on-chip 5-
volt regulator, two error amplifiers, adjustable oscillator, dead-time control
comparator, pulse-steering flip-flop, and output-control circuitry. The
uncommitted output transistors provide either common-emitter or emitter-
follower output capability. Push-pull or single-ended output operation may be
selected through the output-control function. The architecture of the IL494
prohibits the possibility of either output being pulsed twice during push-pull
operation.
IL494A
FEATURE
• Complete PWM Power Control Circuitry
• Uncommitted Outputs for 200 mA Sink or Source
• Output Control Selects Single-Ended or Push-Pull Operation
• Internal Circuitry Prohibits Double Pulse at Either Output
• Internal Regulator Provides a Stable 5 V Reference Supply
• Variable Dead-Time Provides Control Over Total Range
PIN ASSIGNMENT
Device
IL494AN
IL494AD
IL494ADT
ORDERING INFORMATION
Operating
Temperature Range
TA = -20° to 85° C
for all packages
Package
Plastic
DIP-16
SOP-16
SOP-16
Shipping
Tube
Tube
Tape& Reel
FUNCTION TABLE
Output Control
Grounded
At V_ref
Output Function
Single-ended or Parallel Output
Normal Push-Pull Operation
LOGIC DIAGRAM
July 2009, Ver.01