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UC2844N Datasheet(PDF) 5 Page - Texas Instruments

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Part No. UC2844N
Description  CURRENT MODE PWM CONTROLLER
Download  28 Pages
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2844N Datasheet(HTML) 5 Page - Texas Instruments

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ERROR AMP CONFIGURATION
_
+
2.5 V
2
1
VFB
COMP
ZF
ZI
0.5 mA
UNDER-VOLTAGE LOCKOUT
VCC
<17 mA
<1 mA
VOFF
VON
VCC
7
VCC
ON/OFF Command
to REST of IC
UC1842
UC1844
UC1843
UC1845
VON
VOFF
16 V
10 V
8.4 V
7.6 V
CURRENT SENSE CIRCUIT
Peak Current (IS) is Determined By The Formula
ERROR
AMP
2R
R
1 V
5
COMP
CURRENT
SENSE
GND
IS
R
C
RS
CURRENT
SENSE
COMPARATOR
,1.0 V
RS
ISMAX
1
3
5
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
SLUS223C – APRIL 1997 – REVISED JUNE 2007
Error amp can source or sink up to 0.5 mA.
During under-voltage lock-out, the output drive is biased to sink minor amounts of current. Pin 6 should be
shunted to ground with a bleeder resistor to prevent activating the power switch with extraneous leakage
currents.
A small RC filter may be required to suppress switch transients.
5
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