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参数资料
| 型号： | PJ494CS |
| 元件分类： | 稳压器 |
| 英文描述： | 0.25 A SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 1/11页 |
| 文件大小： | 688K |
| 代理商： | PJ494CS |
PJ494
Switchmode Pulse Width Modulation Control Circuit
1-11
2002/11.rev.A
DIP-16
SOP-16
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.
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%
Circuit Architecture Allows Easy Synchronization
(unless otherwise noted)
T
Device
OperatingTemperature
(Ambient)
Package
PJ494CD
DIP-16
PJ494CS
-20℃ to +85℃
SOP-16
Rating
Symbol
Value
Unit
Supply voltage
Vcc
41
Amplifier input voltage
Vi
Vcc+0.3
Collector output voltage
Vo
41
V
Collector output current
250
mA
Operating free-air temperature range
-20 to 85
Storage temperature range
Tstg
-25 to 125
Operating Junction Temperature
TJ
125
Lead temperature 1,6mm from case for 10 seconds
260
℃
Power Dissipation @TA≦45℃
PD
1000
mW
FEATURES
ORDERING INFORMATION
Pin 1.Noninv Input
2.Inv Input
3.Feedback
4.Dead-Time Control
5.CT
6.RT
7.Gnd
8.C1
9.E1
10.E2
11.C2
12.Vcc
13.Output Control
14.Ref Out
15. Inv Input
16. Noninv Input
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE
﹜Error Amp2
﹜Error Amp1
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