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PL494 Datasheet Preview

PL494 Datasheet

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

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PL494
Revised Date : 2007/11/20
Page No. : 1/14
PULSE-WIDTH-MODULATION
CONTROL CIRCUITS
˙Complete PWM Power Control Circuitry
˙Uncommitted Outputs for 200-mA 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 5-V
Reference Supply With 5% Tolerance
˙Circuit Architecture Allows Easy Synchronization
Description
PLASTIC PACKAGE DIP-16
PLASTIC PACKAGE SO-16
The PL494 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 PL494 contains two error amplifiers, an on-chip
adjustable oscillator, a dead-time control (DTC)
comparator , a pulse-steering control flip-flop, a 5-V, 5%-
precision regulator, and output-control circuits.
PIN CONNECTIONS
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.
(TOP VIEW)
FUNCTION TABLE
INPUT TO OUTPUT CTRL
OUTPUT FUNCTION
VI=GND
VI=Vref
Single-ended or parallel output
Normal push-pull operation
PL494
PAIHAUNG Product Specification




PAIHAUNG

PL494 Datasheet Preview

PL494 Datasheet

PULSE-WIDTH-MODULATION CONTROL CIRCUITS

No Preview Available !

PL494
Revised Date : 2007/11/20
Page No. : 2/14
Description (continued)
The uncommitted output transistors provide either common-emitter or emitter-follower output
capability. The PL494 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.
The PL494CN is characterized for operation from 0°C to 70°C.
Functional block diagram
PL494
PAIHAUNG Product Specification


Part Number PL494
Description PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Maker PAIHAUNG
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