TECHNICAL DATA
PWM Control Circuit
The
KKK494
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
KK494
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
KK494
prohibits the possibility of either output being
pulsed twice during push-pull operation.
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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
KK494
ORDERING INFORMATION
KK494N
Plastic
KK494D
SOIC
T
A
= -20擄C to 85擄 C for all packages
PIN ASSIGNMENT
FUNCTION TABLE
Output Control
Grounded
At V
ref
Output Function
Single-ended or Parallel Output
Normal Push-Pull Operation
LOGIC DIAGRAM
1
1
2
3
4
5
