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UC1844A Datasheet Preview

UC1844A Datasheet

CURRENT MODE PWM CONTROLLER

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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




LINFINITY

UC1844A Datasheet Preview

UC1844A Datasheet

CURRENT MODE PWM CONTROLLER

No Preview Available !

PRODUCT DATABOOK 1996/1997
UC184xA/284xA/384xA
CURRENT MODE PWM CONTROLLER
PRODUCTION DATA SHEET
A B S O L U T E M A X I M U M R AT I N G S (Note 1)
Supply Voltage (Low Impedance Source) (VCC) ......................................................... 30V
Supply Voltage (ICC < 30mA) .......................................................................... Self Limiting
Output Current ............................................................................................................. ±1A
Output Energy (Capacitive Load) ................................................................................. 5µJ
Analog Inputs (VFB & ISENSE) ........................................................................ -0.3V to +6.3V
Error Amp Output Sink Current ............................................................................... 10mA
Power Dissipation at TA = 25°C (M Package) .............................................................. 1W
Storage Temperature Range .................................................................... -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) ............................................................. 300°C
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal. Pin
numbers refer to DIL packages only.
T H E R MAL DATA
M PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
DM PACKAGE:
95°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
D PACKAGE:
165°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
Y PACKAGE:
120°C/W
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
130°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow
PACKAGE PIN OUTS
COMP
VFB
ISENSE
RT/CT
1
2
3
4
8 VREF
7 VCC
6 OUTPUT
5 GND
M & Y PACKAGE
(Top View)
COMP
VFB
ISENSE
RT/CT
1 8 VREF
2 7 VCC
3 6 OUTPUT
4 5 GND
DM PACKAGE
(Top View)
COMP
N.C.
VFB
N.C.
ISENSE
N.C.
RT/CT
1 14 VREF
2 13 N.C.
3 12 VCC
4 11 VC
5 10 OUTPUT
6 9 GND
7 8 PWR GND
D PACKAGE
(Top View)
2 Copyright © 1995
Rev. 1.2 12/95


Part Number UC1844A
Description CURRENT MODE PWM CONTROLLER
Maker LINFINITY
Total Page 8 Pages
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