UC2844N Просмотр технического описания (PDF) - Motorola => Freescale
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производитель
UC2844N Datasheet PDF : 14 Pages
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UC3844, 45 UC2844, 45
Figure 1. Timing Resistor versus
Oscillator Frequency
100
VCC = 15 V
50
TA = 25°C
20
10
5.0
2.0 NOTE: Output switches
at one–half the oscillator
frequency.
1.0
10 k 20 k
50 k
100 k 200 k
500 k
fosc, OSCILLATOR FREQUENCY (Hz)
1.0 M
Figure 2. Output Deadtime versus
Oscillator Frequency
75
1.0 nF
70
2.0 nF
5.0 nF
65
CT = 10 nF
60
55
50
10 k
100 pF
200 pF
500 pF
20 k
50 k 100 k 200 k
500 k 1.0 M
fosc, OSCILLATOR FREQUENCY (Hz)
2.55 V
Figure 3. Error Amp Small Signal
Transient Response
VCC = 15 V
AV = –1.0
TA = 25°C
2.5 V
2.45 V
0.5 µs/DIV
Figure 4. Error Amp Large Signal
Transient Response
VCC = 15 V
3.0 V
AV = –1.0
TA = 25°C
2.5 V
2.0 V
1.0 µs/DIV
Figure 5. Error Amp Open Loop Gain and
Phase versus Frequency
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. Current Sense Input Threshold
versus Error Amp Output Voltage
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)
4
MOTOROLA ANALOG IC DEVICE DATA
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