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UC2844AN View Datasheet(PDF) - STMicroelectronics

Part Name
Description
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UC2844AN Datasheet PDF : 16 Pages
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UC384XA - UC284XA
Figure 4. Open Loop Test Circuit.
4.7K
ERROR AMP.
ADJUST
4.7K
2N2222
100K
1K
ISENSE
ADJUST
5K
RT
COMP
VFB
ISENSE
RT/CT
VREF
8
1
2
3
4
0.1µF
7
Vi
0.1µF
OUTPUT
6
GROUND
5
A
1W
1K
VREF
Vi
OUTPUT
CT
D95IN343
GROUND
High peak currents associated with 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 K
potentiometer are used to sample the oscillator waveform and apply an adjustable ramp to pin 3.
Figure 5. Oscillator Frequency vs Timing
Resistance
fo
(Hz)
D96IN362
1M
100K
CT=470pF
1nF
2.2nF
4.7nF
Figure 7. Oscillator Discharge Current vs.
Temperature.
Idischg
(mA)
8.5
D95IN335
Vi=15V
VOSC=2V
8.0
10K
7.5
1K
300
1K
3K
10K
30K
RT()
Figure 6. Maximum Duty Cycle vs Timing
Resistor
fo
(Hz)
D96IN363
80
60
40
20
0
300
1K
3K
10K
30K
RT()
7.0
-55 -25 0 25 50 75 100 TA(˚C)
Figure 8. Error Amp Open-Loop Gain and
Phase vs. Frequency.
(dB)
D95IN337 φ
Vi=15V
80
VO=2V to 4V 30
Gain
RL=100K
TA=25˚C
60
60
40
90
Phase
20
120
0
150
-20
180
10 100 1K 10K 100K 1M f(Hz)
5/16
 

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