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UC2845BD Datasheet(PDF) 7 Page - STMicroelectronics

Part # UC2845BD
Description  HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UC2845BD Datasheet(HTML) 7 Page - STMicroelectronics

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background image
0
200
400
600
IO(mA)
0
1
2
3
-2
-1
Vsat
(V)
D95IN341
Vi=15V
80
µs Pulsed Load 120Hz Rate
TA=-40°C
TA=25°C
Vi
TA=-40°C
TA=25°C
GND
Sink Saturation
(Load to Vi)
Source Saturation
(Load to Ground)
Figure 10: Output Saturation Voltagevs. Load
Current.
0
102030
Vi(V)
0
5
10
15
20
Ii
(mA)
RT=10K
CT=3.3nF
VFB=0V
ISense=0V
TA=25°C
D95IN342
Figure 11: Supply Current vs. Supply Voltage.
Figure 12: Output Waveform.
Figure 13: Output Cross Conduction
5V REG
OSCILLATOR
PWM
CLOCK
8
4
5
6
RT
CT
GND
OUTPUT
7
Vi
ID
CT
OUTPUT
LARGE RT/SMALL CT
CT
OUTPUT
SMALL RT/LARGE CT
D95IN344
Figure 14: Oscillator and Output Waveforms.
Vi =15V
CL = 1.0nF
TA =25
°C
90%
10%
50ns/DIV
Vi =30V
CL = 15pF
TA =25
°C
VO
ICC
100ns/DIV
100mA/DIV
20V/DIV
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
7/15


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