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UC2845D View Datasheet(PDF) - ON Semiconductor

Part Name
Description
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UC2845D Datasheet PDF : 16 Pages
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UC3844, UC3845, UC2844, UC2845
10
75
0
VCC = 15 V
50
TA = 25°C
70
1.0 nF
2.0 nF
20
5.0 nF
65
10
CT = 10 nF
5.0
60
2.0 NOTE: Output switches
at one−half the oscillator
frequency.
1.0
10 k 20 k
50 k
100 k 200 k
fosc, OSCILLATOR FREQUENCY (Hz)
500 k
Figure 2. Timing Resistor versus
Oscillator Frequency
1.0 M
55
50
10 k
500
pF
20 k
50 k 100 k 200 k
fosc, OSCILLATOR FREQUENCY (Hz)
100
pF
200
pF
500 k 1.0 M
Figure 3. Output Deadtime versus
Oscillator Frequency
2.55 V
2.5 V
VCC = 15 V
AV = −1.0
TA = 25°C
3.0 V
2.5 V
VCC = 15 V
AV = −1.0
TA = 25°C
2.45 V
0.5 ms/DIV
Figure 4. Error Amp Small Signal
Transient Response
2.0 V
1.0 ms/DIV
Figure 5. Error Amp Large Signal
Transient Response
100
0
VCC = 15 V
80
Gain
VO = 2.0 V to 4.0 V
RL = 100 K
30
TA = 25°C
60
60
40
90
Phase
20
120
0
− 20
10
150
180
100
1.0 k
10 k
100 k 1.0 M 10 M
f, FREQUENCY (Hz)
Figure 6. Error Amp Open Loop Gain and
Phase versus Frequency
1.2
VCC = 15 V
1.0
0.8
TA = 25°C
0.6
TA = 125°C
0.4
TA = −55°C
0.2
0
0
2.0
4.0
6.0
8.0
VO, ERROR AMP OUTPUT VOLTAGE (V)
Figure 7. Current Sense Input Threshold
versus Error Amp Output Voltage
http://onsemi.com
4
 

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