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UC284XA Datasheet(PDF) 5 Page - STMicroelectronics

Part No. UC284XA
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC284XA Datasheet(HTML) 5 Page - STMicroelectronics

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UC384XA - UC284XA
Figure 4. Open Loop Test Circuit.
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.
RT
A
2N2222
4.7K
1K
ERROR AMP.
ADJUST
4.7K
5K
ISENSE
ADJUST
100K
COMP
VFB
ISENSE
RT/CT
1
2
3
4
CT
7
6
5
8
VREF
Vi
OUTPUT
GROUND
0.1
µF
0.1
µF
VREF
Vi
OUTPUT
GROUND
1W
1K
D95IN343
Figure 5. Oscillator Frequency vs Timing
Resistance
Figure 6. Maximum Duty Cycle vs Timing
Resistor
Figure 7. Oscillator Discharge Current vs.
Temperature.
Figure 8. Error Amp Open-Loop Gain and
Phase vs. Frequency.
300
1K
3K
10K
30K
RT(Ω)
1K
10K
100K
1M
fo
(Hz)
D96IN362
CT=470pF
1nF
2.2nF
4.7nF
300
1K
3K
10K
30K
RT(Ω)
0
20
40
60
fo
(Hz)
D96IN363
80
-55
-25
0
25
50
75
100 TA(˚C)
7.0
7.5
8.0
8.5
Idischg
(mA)
D95IN335
Vi=15V
VOSC=2V
10
100
1K
10K
100K
1M
f(Hz)
-20
0
20
40
60
80
(dB)
180
150
120
90
60
30
φ
D95IN337
Vi=15V
VO=2V to 4V
RL=100K
TA=25˚C
Gain
Phase


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