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UC2843 Datasheet

CURRENTMODE PWM CONTROLLER

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UC2842/3/4/5
® UC3842/3/4/5
CURRENT MODE PWM CONTROLLER
. OPTIMIZED FOR OFF-LINE AND DC TO DC
CONVERTERS
. LOW START-UP CURRENT (< 1 mA)
. AUTOMATIC FEED FORWARD COMPENSA-
TION
. PULSE-BY-PULSE CURRENT LIMITING
. ENHANCED LOAD RESPONSE CHARAC-
TERISTICS
. UNDER-VOLTAGE LOCKOUT WITH HYSTER-
ESIS
. DOUBLE PULSE SUPPRESSION
. HIGH CURRENT TOTEM POLE OUTPUT
. INTERNALLY TRIMMED BANDGAP REFER-
ENCE
. 500 KHz OPERATION
. LOW RO ERROR AMP
DESCRIPTION
TheUC3842/3/4/5family of controlICs provides the
necessary features to implement off-line or DC to
DC fixed frequency current mode control schemes
with a minimal externalparts count.Internallyimple-
mentedcircuits include undervoltagelockout featur-
ing start-up current less than 1 mA, a precision ref-
erence trimmed for accuracy at the error amp input,
Minidip
SO14
logic to insure latched operation, a PWM compara-
torwhich also providescurrentlimit control,and a to-
tem pole output stage designed to source or sink
high peak current. The output stage, suitable for
driving N-Channel MOSFETs, is low in theoff-state.
Differences between members of this family are the
under-voltage lockout thresholds and maximum
duty cycle ranges. The UC3842 and UC3844 have
UVLO thresholds of 16V (on) and 10V (off), ideally
suited off-line applications The corresponding
thresholds for the UC3843 and UC3845 are 8.5 V
and 7.9 V. The UC3842 and UC3843 can operate
to duty cycles approaching 100%. A range of the
zero to < 50 % is obtained by the UC3844 and
UC3845 by the additionof an internal toggle flip flop
which blanks the output off every other clock cycle.
BLOCK DIAGRAM (toggle flip flop used only in U3844 and UC3845)
October 1998
1/11


STMicroelectronics Electronic Components Datasheet

UC2843 Datasheet

CURRENTMODE PWM CONTROLLER

No Preview Available !

UC2842/3/4/5-UC3842/3/4/5
ABSOLUTE MAXIMUM RATINGS
Sy mb o l
Vi
Vi
IO
EO
Ptot
Ptot
Tstg
TL
P a ra met er
Supply Voltage (low impedance source)
Supply Voltage (Ii < 30mA)
Output Current
Output Energy (capacitive load)
Analog Inputs (pins 2, 3)
Error Amplifier Output Sink Current
Power Dissipation at Tamb 50 °C (minidip, DIP-14)
Power Dissipation at Tamb 25 °C (SO14)
Storage Temperature Range
Lead Temperature (soldering 10s)
* All voltages are with respect to pin 5, all currents are positive into the specified terminal.
PIN CONNECTIONS (top views)
SO14
V al u e
30
Self Limiting
±1
5
– 0.3 to 6.3
10
1
725
– 65 to 150
300
Minidip
Unit
V
A
µJ
V
mA
W
mW
°C
°C
ORDERING NUMBERS
T ype
UC2842
UC3843
UC2844
UC2845
UC3842
UC3843
UC3844
UC3845
Minidip
UC2842N
UC2843N
UC2844N
UC2845N
UC3842N
UC3843N
UC3844N
UC3845N
THERMAL DATA
Symbol
Description
Rth j-amb Thermal Resistance Junction-ambient.
2/11
SO14
UC2842D
UC2843D
UC2844D
UC2845D
UC3842D
UC3843D
UC3844D
UC3845D
Min id ip
max.
100
SO14
165
Unit
°C


Part Number UC2843
Description CURRENTMODE PWM CONTROLLER
Maker STMicroelectronics
Total Page 11 Pages
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