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PJ494 Schematic ( PDF Datasheet ) - Promax-Johnton

Teilenummer PJ494
Beschreibung Switchmode Pulse Width Modulation Control Circuit
Hersteller Promax-Johnton
Logo Promax-Johnton Logo 




Gesamt 11 Seiten
PJ494 Datasheet, Funktion
PJ494
Switchmode Pulse Width Modulation Control Circuit
T he PJ494 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, these devices offer the systems
engineer the flexibility to tailor the power supply control
circuitry to his application.
The PJ494 contains an error amplifier, an on-chip adjustable
oscillator, a deed-time control comparator, pulse-steering
control flip-flop, a 5-volt, 5% precision regulator, and output-
control circuits. The error amplifier exhibits a common-mode
voltage from –0.3 volts to Vcc –2 volts. The dead-time
control comparator has a fixed offset that provides
approximately 5% dead time when externally altered. The on-
chip oscillatory be bypassed by terminating RT (pin 6) to the
reference output and providing a sawtooth input to CT (PIN
5), or it may be used to drive the common circuits in
synchronous multiple-rail power supplies. The uncommited
output transistor 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.
FEATURES
Complete 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 5-V Reference Supply, 5%
ORDCiErcRuiItNAGrcIhNiteFcOturReMAAlloTwIsOENasy Synchronization
Device
PJ494CD
PJ494CS
OperatingTemperature
(Ambient)
-20to +85
Package
DIP-16
SOP-16
DIP-16
SOP-16
Pin 1.Noninv Input
2.Inv Input
3.Feedback
5.CT
8.C1
11.C2
13.Output Control
15. Inv Input
16. Noninv Input
Error Amp1
4.Dead-Time Control
6.RT
9.E1
7.Gnd
10.E2
12.Vcc
14.Ref Out
Error Amp2
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE
(unless otherwise noted)
Rating
Supply voltage
Amplifier input voltage
Collector output voltage
Collector output current
Operating free-air temperature range
Storage temperature range
Operating Junction Temperature
Lead temperature 1,6mm from case for 10 seconds
Power Dissipation @TA≦45℃
Symbol
Vcc
Vi
Vo
Tstg
TJ
PD
Value
41
Vcc+0.3
41
250
-20 to 85
-25 to 125
125
260
1000
Unit
V
mA
mW
1-11
2002/11.rev.A
Free Datasheet http://www.datasheet4u.com/






PJ494 Datasheet, Funktion
PJ494
Switchmode Pulse Width Modulation Control Circuit
Figure 4. Open Loop Voltage Gain and
Phase Versus Frequency
Figure 5. Percent Deadtime versus
Oscillator Frequency
Figure 6. Percent Duty Cycle versus
Deadtime Control Voltage
Figure 7. Emitter-Follower Configuration
Output Saturation versus Emitter Current
Figure 8. Common-Emitter Configuration
Output Saturation Voltage versus
Collector Current
Figure 9. Standby Supply Current
versus Supply Voltage
6-11
2002/11.rev.A
Free Datasheet http://www.datasheet4u.com/

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