The UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count

UC2845

Manufacturer Part NumberUC2845
DescriptionThe UC1842/3/4/5 family of control devices provides the necessary features to implement off-line or dc-to-dc fixed frequency current mode control schemes with a minimal external parts count
ManufacturerTexas Instruments
UC2845 datasheet
 


Specifications of UC2845

TopologyBoost, Flyback, ForwardControl MethodCurrent
Duty Cycle(max)(%)50Frequency(max)(khz)450
Uvlo Thresholds On/off(v)8.4/7.6Pin/package14SOIC, 8PDIP, 8SOIC
Vin(min)(v)7.6Vin(max)(v)30
Regulated Outputs(#)1Operating Temperature Range(c)-40 to 85
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UC1842/3/4/5
UC2842/3/4/5
UC3842/3/4/5
SLUS223C – APRIL 1997 – REVISED JUNE 2007
ABSOLUTE MAXIMUM RATINGS
Low impedance source
Supply voltage
I
CC
Output current
Output energy (capacitive load)
Analog inputs (Pins 2, 3)
Error amp output sink current
T
A
Power dissipation
T
A
T
A
Storage temperature range
Junction temperature range
Lead temperature (soldering, 10 seconds)
(1) All voltages are with respect to Pin 5. All currents are positive into the specified terminal. Consult Packaging Section of Databook for
thermal limitations and considerations of packages.
DIL-8, SOIC-8
N or J PACKAGE, D8 PACKAGE
(TOP VIEW)
COMP
1
V
2
FB
I
3
SENSE
R
/C
4
T
T
SOIC-14, CFP-14
D or W PACKAGE
(TOP VIEW)
1
COMP
2
NC
3
V
FB
NC
4
5
I
SENSE
NC
6
R
/C
7
T
T
NC − No internal connection
2
(1)
< 30 mA
25 C (DIL-8)
25 C (SOIC-14)
25 C (SOIC-8)
CONNECTION DIAGRAMS
V
8
REF
V
7
CC
OUTPUT
6
GROUND
5
NC
4
V
5
FB
NC
6
I
7
SENSE
V
14
REF
NC
8
NC
13
V
12
CC
V
11
C
OUTPUT
10
GROUND
9
PWR GND
8
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UNIT
30 V
Self Limiting
1 A
5 J
–0.3 V to 6.3 V
10 mA
1 W
725 mW
650 mW
–65 C to 150 C
–55 C to 150 C
300 C
PLCC-20
Q PACKAGE
(TOP VIEW)
3 2 1 20 19
V
18
CC
V
17
C
NC
16
OUTPUT
15
NC
14
9 10 11 12 13