Datasheet
Current
Sense
Comparator
PWM
Latch
GND
Output
V
C
V
5 V
50 mA
REF
V
CC
GND
R /C
T T
V
FB
COMP
I
SENSE
Internal
Bias
S/R
5-V
REF
V
Good
Logic
REF
UVLO
34 V
2.5 V
Osc
Error
Amp
S
R
2R
R
1 V
7
5
4
2
1
3
5
6
7
8
ABSOLUTE MAXIMUM RATINGS
(1) (2)
UC2843A-Q1
SGLS384 – MAY 2008 ........................................................................................................................................................................................................
www.ti.com
FUNCTIONAL BLOCK DIAGRAM
over operating free-air temperature range (unless otherwise noted)
VALUE UNIT
V
CC
voltage (low impedance source) 30 V
V
CC
voltage (I
CC
mA) Self limiting
I
O
Output current ± 1 A
Output energy (capacitive load) 5 µ J
Analog inputs (pins 3 and 5) – 0.3 to 6.3 V
Error amplifier output sink current 10 mA
Power dissipation at T
A
< 25 ° C (14-pin D package) 1 W
θ
JA
Package thermal impedance
(3)
97 ° C/W
T
stg
Storage temperature range – 65 to 150 ° C
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds 260 ° C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Unless otherwise indicated, voltages are reference to ground, and currents are positive into and negative out of the specified terminals.
(3) Long-term high-temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction of
overall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.
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Product Folder Link(s): UC2843A-Q1