UC3843D8 UNITRODE, UC3843D8 Datasheet - Page 5

• Manufacturer Part Number: UC3843D8
• Description: PWM CONTROLLER, SMD, 3843, SOIC8
• Manufacturer: UNITRODE

Specifications of UC3843D8

• Input Voltage: 15V
• Output Voltage: 5V
• Output Current: 200mA
• Frequency: 500kHz
• Power Dissipation Pd: 650mW
• Supply Voltage Range: 12V To 25V
• Digital Ic Case Style: SOIC
• No. Of Pins: 8
• Operating: RoHS Compliant

ERROR AMP CONFIGURATION
Error amp can source or sink up to 0.5 mA.
UNDER-VOLTAGE LOCKOUT
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.
CURRENT SENSE CIRCUIT
A small RC filter may be required to suppress switch transients.
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V
CC
7
V
V
OFF
ON
R
Z
S
I
S
R
I
UC1842
UC1844
C
5
16 V
10 V
ON/OFF Command
to REST of IC
Z
Peak Current (I
UC1843
UC1845
F
1
3
5
8.4 V
7.6 V
COMP
COMP
CURRENT
SENSE
GND
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V
FB
2
1
S
ERROR
AMP
) is Determined By The Formula
I
2.5 V
SMAX
<17 mA
<1 mA
,1.0 V
RS
V
+
_
CC
2R
R
1 V
V
SLUS223C – APRIL 1997 – REVISED JUNE 2007
OFF
CURRENT
SENSE
COMPARATOR
0.5 mA
V
ON
UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
V
CC
5