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
OSCILLATOR SECTION
V
8
REF
R
T
R
/C
4
T
T
C
T
GROUND
5
1.72
For R
> 5 K f ~
T
R
C
T
T
OUTPUT SATURATION CHARACTERISTICS
ERROR AMPLIFIER OPEN-LOOP FREQUENCY RESPONSE
80
60
40
20
0
6
Deadtime vs C
(R
>5 kW)
T
T
30
10
3
1
0.3
1
2.2
4.7
10
22
47
100
C
− nF
T
4
V
= 15 V
CC
3
T
= 25 C
A
T
= −55 C
A
2
SOURCE SAT
1
(V
CC −
SINK SAT (V
OL
0
.01
.02
.03 .04 .05
.07 .1
.2
.3 .4 .5
Output Current, Source or Sink − A
Av
10
100
1 k
10 k
100 k
1 M
f − Frequency − Hz
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www.ti.com
Timing Resistance vs Frequency
100
30
10
3
100
1 k
10 k
100 k
1 M
f − Frequency − Hz
V
OH)
)
.7
1
0
−45
−90
−135
−180
10 M