BIPOLAR LINEAR INTEGRATED CIRCUIT
Voltage-Mode PWM Controller IC
The KIA494AP/AF 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, this device offers the systems engineer the flexibility to
tailor the power supply control circuitry to a specific application.
The KIA494AP/AF contains two error amplifiers, an on-chip
adjustable oscillator, a dead-tme control(DTC) comparator, a
pulse-steering control flip-flop, a 5-V, 5%-precision requlator,
and output-control circuits.
The error amplifiers exhibit a common-mode voltage range
from -0.3V to Vcc -2V. The dead-time control comparator has
a fixed offset that provides approximately 5% dead time.
The on-chip oscillator may be bypassed by terminating RT to
the reference output and providing a sawtooth input to CT,
or it may drive the common circuits in synchronous multiple-
rail power supplies.
The uncommitted output transistors provide either common-
emitter or emitter-follower output capability. The KIA494AP/AF
provides for push-pull or single-ended output operation, which
may be selected through the output-control function.
The architecture of this device prohibits the possibility of
either output being pulsed twice during push-pull operation.
0 . 5 0 MIN
L 3.3± 0.3
0 0 - 15-
* Completed PWM Power Control Circuitry.
* 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 Control Over Total Range.
* Internal Regulator Provides a Stable 5V Reference Supply
With 5% Tolerance.
* Circuit Architecture Allows Easy Synchronization.
MAXIMUM RATINGS (Ta=25°C)
SYMBOL RATING UNIT
Vcc 41 V
Error Amplifier Input Voltage
Collector Output Voltage
Collector Output Current
V 0 41 V
Io 250 mA
T 0 p r -40 — 85 °C
Tstg -65 — 150 °C
J U 1 Ld
H H H Hifl H H H"
H H H H! H H H H_
Vi=GND Single-ended or paralled output
Vi=Vref Normal push-pull operation
1999. 2. 20
Revision No : 0