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UC2845A(1999) View Datasheet(PDF) - STMicroelectronics

Part Name
Description
View to exact match
UC2845A
(Rev.:1999)
ST-Microelectronics
STMicroelectronics ST-Microelectronics
UC2845A Datasheet PDF : 15 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Figure 1: Open Loop Test Circuit.
UC2842A/3A/4A/5A - UC3842A/3A/4A/5A
4.7K
ERROR AMP.
ADJUST
4.7K
2N2222
100K
1K
ISENSE
ADJUST
5K
RT
COMP
VFB
ISENSE
RT/CT
VREF
8
1
7
2
UC3842A
3
6
4
5
0.1µF
Vi
OUTPUT
0.1µF
GROUND
CT
D95IN343
A
1W
1K
VREF
Vi
OUTPUT
GROUND
High peak currents associatedwith capacitive loads
necessitate careful grounding techniques. Timing
and bypass capacitors should be connected close
to pin 5 in a single point ground. The transistor and
5 Kpotentiometerareusedto samplethe oscillator
waveform and apply an adjustable ramp to pin 3.
Figure 2: Oscillator Frequency vs Timing Resis-
tance
fo
(Hz)
D96IN362
1M
100K
10K
1CnTF=470pF
2.2nF
4.7nF
Figure 3: Maximum Duty Cycle vs Timing Resis-
tor
fo
(Hz)
D96IN363
80
60
40
20
1K
300
1K
3K
10K
30K
RT()
0
300
1K
3K
10K
30K
RT()
5/15
 

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