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PDF UTC494 Data sheet ( Hoja de datos )
| Número de pieza | UTC494 | |
| Descripción | VOLTAGE MODE PWM CONTROL CIRCUITS | |
| Fabricantes | YOUWANG | |
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UTC494
LINEAR INTEGRATED CIRCUIT
VOLTAGE MODE PWM CONTROL
CIRCUITS
DESCRIPTION
The UTC494 incorporate 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, the device offers the systems engineer the flexibility to
tailor the power supply control circuitry to its
application.
The UTC494 contains an error amplifier,current-limiting
amplifier, an on-chip adjustable oscillator, a dead time control
com parator,pulse-steering control flip-flop,a 5-
volt ,1% precision supply regulator,and output control
circuits.
The error amplifier exhibits a common-mode Voltage range
from -0.3V to VCC-2V.The current-limit amplifier exhibits a
common-mode Voltage range from -0.3V to 3V with an offset
Voltage of approximately 80 mV in series with the inverting
input to ease circuit design requirements. The dead-time
control comparator has a fixed offset that provides
approximately 5% dead time when externally altered. The on-
chip oscillator may be bypassed by terminating RT(pin 6) to the
reference output and providing a sawtooth Input to CT(pin 5),or
it m ay be used to drive the common circuits in
synchronous multiple-rail power supplies.
The Uncommitted output transistors provide either common-
em itter or em itter-follower output capability.Each device
provides for push-pull or single-ended output operation,which
m ay be selected through the output-control function. the
architecture of these devices prohibits the possibility of either
being pulsed twice during push-pull
operation.
DIP-16
SOP-16
FEATURES
*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 control Over
Total Range
*Circuit architecture Allows easy Synchron -
Ization
*Undervoltage Lockout
ABSOLUTE MAXIMUM RATINGS
(Unless otherwise noted ,all is over operating free-air temperature Range)
Characteristic
Symbol
Supply Voltage(note 1)
Vcc
Amplifier Input Voltage
Vi
Collector Output Voltage
Vo
Collector Output Current
Ico
Continuous total dissipation at(or for below) 25
free air temperature(note 2)
PD
Operating Temperature Range
Topr
Storage Temperature Range
Tstg
lead Temperature 1.6mm from case for 60
sec.
Tcase
Value
40
Vcc+0.3
41
250
1000
0 to 70
-65 to 150
300
Unit
V
V
V
mA
mW
°C
°C
°C
note1: All voltage values,except differential voltages are with respect to the network ground terminal.
note 2:For operation above 25°C free-air temperature,The dissipation derates with 9.2mW/°C.
YOUWANG ELECTRONICS CO.LTD
1
2010.09.26 V1.4
1 page  
UTC494
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATIONS
NONINV
INPUT
INV INPUT
1
2
FEEDBACK
DEAD-TIME
CONTROL
CT
3
4
5
RT 6
GND
7
C1 8
16
NONINV
INPUT
15 INV INPUT
14 Vref
13
OUTPUT
CONTROL
12 Vcc
11 C2
10 E2
9 E1
TYPICAL APPLICATION CIRCUIT
YOUWANG ELECTRONICS CO.LTD
5
2010.09.26 V1.4
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UTC494.PDF ] | |
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