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UC3844 Datasheet(PDF) 4 Page - ON Semiconductor

Part No. UC3844
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3844 Datasheet(HTML) 4 Page - ON Semiconductor

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UC3844, 45 UC2844, 45
4
MOTOROLA ANALOG IC DEVICE DATA
Figure 1. Timing Resistor versus
Oscillator Frequency
Figure 2. Output Deadtime versus
Oscillator Frequency
Figure 3. Error Amp Small Signal
Transient Response
Figure 4. Error Amp Large Signal
Transient Response
0.5
µs/DIV
VCC = 15 V
AV = –1.0
TA = 25°C
VCC = 15 V
AV = –1.0
TA = 25°C
1.0
µs/DIV
10 k
20 k
50 k
100 k
200 k
500 k
1.0 M
fosc, OSCILLATOR FREQUENCY (Hz)
VCC = 15 V
TA = 25°C
10 k
20 k
50 k
100 k
200 k
500 k
1.0 M
fosc, OSCILLATOR FREQUENCY (Hz)
Figure 5. Error Amp Open Loop Gain and
Phase versus Frequency
Figure 6. Current Sense Input Threshold
versus Error Amp Output Voltage
NOTE: Output switches
at one–half the oscillator
frequency.
CT = 10 nF
5.0 nF
2.0 nF
1.0 nF
100 pF
500 pF
200 pF
2.55 V
2.5 V
2.45 V
2.5 V
3.0 V
2.0 V
100
50
20
10
5.0
2.0
1.0
75
70
65
60
55
50
–20
10 M
10
f, FREQUENCY (Hz)
Gain
Phase
VCC = 15 V
VO = 2.0 V to 4.0 V
RL = 100 K
TA = 25°C
0
30
60
90
120
150
180
100
1.0 k
10 k
100 k
1.0 M
0
20
40
60
80
100
0
VO, ERROR AMP OUTPUT VOLTAGE (V)
0
0.2
0.4
0.6
0.8
1.0
1.2
2.0
4.0
6.0
8.0
VCC = 15 V
TA = 25°C
TA = –55°C
TA = 125°C


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