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參數(shù)資料
| 型號： | PJ494 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Switchmode Pulse Width Modulation Control Circuit |
| 中文描述： | 開關(guān)模式脈寬調(diào)制控制電路 |
| 文件頁數(shù)： | 1/11頁 |
| 文件大小： | 688K |
| 代理商： | PJ494 |
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 R
T
(pin 6) to the
reference output and providing a sawtooth input to C
T
(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%
ORDERING INFORMATION
Circuit Architecture Allows Easy Synchronization
(unless otherwise noted)
T
Device
OperatingTemperature
(Ambient)
Package
PJ494CD
PJ494CS
DIP-16
SOP-16
-20
℃
to +85
℃
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
T
stg
T
J
-25 to 125
Operating Junction Temperature
125
Lead temperature 1,6mm from case for 10 seconds
260
℃
Power Dissipation @T
A
≦45℃
P
D
1000
mW
FEATURES
Pin 1.Noninv Input
2.Inv Input
3.Feedback 4.Dead-Time Control
5.C
T
6.R
T
7.Gnd
8.C1 9.E1 10.E2
11.C2 12.Vcc
13.Output Control 14.Ref Out
15. Inv Input
16. Noninv Input
﹜
Error Amp2
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE
﹜
Error Amp1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PJ494CD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Switchmode Pulse Width Modulation Control Circuit |
| PJ494CS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Switchmode Pulse Width Modulation Control Circuit |
| PJ4A | 制造商:Cooper Wiring Devices 功能描述: |
| PJ4L40 | 制造商:PANJIT 制造商全稱:Pan Jit International Inc. 功能描述:QUAD SCHOTTKY DATA LINE BUS TERMINATOR |
| PJ4L40_08 | 制造商:PANJIT 制造商全稱:Pan Jit International Inc. 功能描述:QUAD SCHOTTKY DATA LINE BUS TERMINATOR |
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