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PDF UC3842A Data sheet ( Hoja de datos )
| Número de pieza | UC3842A | |
| Descripción | (UC384xA) CURRENT MODE PWM CONTROLLER | |
| Fabricantes | Microsemi Corporation | |
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T H E I N F I N I T E P O W E R O F I N N O VAT I O N
L I N D O C #: 1840
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PR O D U C T I O N D ATA S H E E T
DESCRIPTION
The UC184xA family of control ICs
provides all the necessary features to
implement off-line fixed-frequency,
current-mode switching power supplies
with a minimum of external compo-
nents. The current mode architecture
demonstrates improved load regulation,
pulse-by-pulse current limiting and
inherent protection of the power supply
output switch. The IC includes: A
bandgap reference trimmed to ±1%
accuracy, an error amplifier, a current
sense comparator with internal clamp to
1V, a high current totem pole output
stage for fast switching of power
MOSFET's, and an externally program-
mable oscillator to set frequency and
maximum duty cycle. The under-
voltage lock-out is designed to operate
with 250µA typ. start-up current,
allowing an efficient bootstrap supply
voltage design. Available options for
this family of products, such as start-up
voltage hysteresis and duty cycle, are
summarized below in the Available
Options section. The UC184xA family
of control ICs is also available in 14-pin
SOIC package which makes the Power
Output Stage Collector and Ground pins
available.
PRODUCT HIGHLIGHT
COMPARISON OF UC384XA VS. SG384 X DISCHARGE CURRENT
SG384x
Min. Limit
UC384xA
TA=25°C
SG384x
Max. Limit
KEY FEATURES
s LOW START-UP CURRENT. (0.5mA max.)
s TRIMMED OSCILLATOR DISCHARGE
CURRENT. (See Product Highlight)
p OPTIMIZED FOR OFF-LINE AND DC-TO-DC
CONVERTERS.
p AUTOMATIC FEED FORWARD
COMPENSATION.
p PULSE-BY-PULSE CURRENT LIMITING.
p ENHANCED LOAD RESPONSE
CHARACTERISTICS.
p UNDER-VOLTAGE LOCKOUT WITH
HYSTERESIS.
p DOUBLE PULSE SUPPRESSION.
p HIGH-CURRENT TOTEM POLE OUTPUT.
p INTERNALLY TRIMMED BANDGAP
REFERENCE.
p 500KHz OPERATION.
p LOW RO ERROR AMPLIFIER.
A P P L I C AT I O N S
s ECONOMICAL OFF-LINE FLYBACK OR
FORWARD CONVERTERS.
s DC-DC BUCK OR BOOST CONVERTERS.
s LOW COST DC MOTOR CONTROL.
7.5 7.8
−3σ
8.3
Mean
8.8 9.3
+3σ
Discharge Current Distribution - mA
AVAILABLE OPTIONS
Part # Start-Up Hysteresis Max. Duty
Voltage
Cycle
UCx842A 16V
6V <100%
UCx843A 8.4V 0.8V <100%
UCx844A 16V
6V <50%
UCx845A 8.4V 0.8V <50%
TA (°C)
PACKAGE ORDER INFORMATION
M
Plastic DIP
8-pin
DM
Plastic
8-pin
SOIC
D
Plastic SOIC
14-pin
Y
Ceramic DIP
8-pin
0 to 70
-40 to 85
-55 to 125
UC384xAM
UC284xAM
—
UC384xADM
UC284xADM
—
UC384xAD
UC284xAD
—
—
UC284xAY
UC184xAY
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. UC3842ADMT)
Copyright © 1995
Rev. 1.2 12/95
FOR FURTHER INFORMATION CALL (714) 898-8121
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841
1
1 page  
PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PR O D U C T I O N D ATA S H E E T
CHARACTERISTIC CURVES
FIGURE 1. — OSCILLATOR FREQUENCY vs. TIMING
RESISTOR
1M
100k
10k
CT = 1nF
CT = 2.2nF
CT = 4.7nF
0
300 1.0k 3.0k 10.0k 30.0k 100k
RT - (ohms)
VREF 8
RT/CT 4
GROUND 5
RT
CT
For RT > 5k, f »
1.72
RT CT
Note: Output drive frequency is half the oscillator frequency for
the UCx844A/5A devices.
FIGURE 2. — MAXIMUM DUTY CYCLE vs. TIMING RESISTOR
100.0
80.0
60.0
40.0
20.0
0
300 1.0k 3.0k 10.0k 30.0k 100k
RT - (ohms)
Copyright © 1995
Rev. 1.2 12/95
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UC3842A.PDF ] | |
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