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UC3845BD1 Datasheet(PDF) 5 Page - STMicroelectronics

Part # UC3845BD1
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC3845BD1 Datasheet(HTML) 5 Page - STMicroelectronics

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Figure 1: Open Loop Test Circuit.
RT
A
2N2222
4.7K
Ω
1K
Ω
ERROR AMP.
ADJUST
4.7K
Ω
5K
Ω
ISENSE
ADJUST
100K
Ω
COMP
V
FB
ISENSE
RT/CT
1
2
3
4
C
T
7
6
5
8
VREF
V
i
OUTPUT
GROUND
0.1
µF
0.1
µF
VREF
V
i
OUTPUT
GROUND
1W
1K
Ω
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
5K
Ω potentiometerareusedto samplethe 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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