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UC3844BD1013TR Datasheet(PDF) 5 Page - STMicroelectronics

Part # UC3844BD1013TR
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3844BD1013TR Datasheet(HTML) 5 Page - STMicroelectronics

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Figure 1: Open Loop Test Circuit.
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
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
Ω potentiometer are used to sample the oscillator
waveform and apply an adjustable ramp to pin 3.
10K
20K
30K
50K
100K
200K 300K
500K
fOSC(KHz)
1
2
5
10
20
50
D95IN333
CT=10nF
CT=5nF
CT=2nF
C
T=1nF
C
T=500pF
C
T=200pF
C
T=100pF
Vi=15V
TA=25˚C
RT
(K
Ω)
0.8
Figure 2: Timing Resistor vs. Oscillator Fre-
quency
10K
20K
30K
50K
100K
200K 300K
500K fOSC(KHz)
1
2
3
5
10
20
30
50
%
CT=10nF
CT=5nF
CT=2nF
CT=1nF
CT=500pF
CT=200pF
CT=100pF
D95IN334
Vi=15V
TA=25˚C
Figure 3: Output Dead-Time vs. Oscillator Fre-
quency
UC2842B
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
5/15


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