UC3842A, 43A UC2842A, 43A
Figure 1. Timing Resistor versus
Oscillator Frequency
80
50
RT, TIMING RESISTOR (k
Ω
)
20
8.0
5.0
2.0 VCC = 15 V
TA = 25°C
0.8
10 k
20 k
50 k
100 k
200 k
500 k
1.0 M
% DT, PERCENT OUTPUT DEADTIME
100
50
20
10
5.0
2.0
1.0
VCC = 15 V
TA = 25°C
Figure 2. Output Deadtime versus
Oscillator Frequency
10 k
20 k
50 k
100 k
200 k
500 k
1.0 M
fOSC, OSCILLATOR FREQUENCY (Hz)
fOSC, OSCILLATOR FREQUENCY (Hz)
Figure 3. Oscillator Discharge Current
versus Temperature
9.0
I dischg , DISCHARGE CURRENT (mA)
VCC = 15 V
VOSC = 2.0 V
8.5
Dmax , MAXIMUM OUTPUT DUTY CYCLE (%)
100
90
80
70
60
50
40
800
Figure 4. Maximum Output Duty Cycle
versus Timing Resistor
VCC = 15 V
CT = 3.3 nF
TA = 25°C
Idischg = 7.2 mA
8.0
7.5
Idischg = 9.5 mA
1.0 k
2.0 k
3.0 k
4.0 k
6.0 k
8.0 k
7.0
–55
–25
0
25
50
75
TA, AMBIENT TEMPERATURE (°C)
100
125
RT, TIMING RESISTOR (Ω)
Figure 5. Error Amp Small Signal
Transient Response
VCC = 15 V
AV = –1.0
TA = 25°C
Figure 6. Error Amp Large Signal
Transient Response
VCC = 15 V
AV = –1.0
TA = 25°C
2.55 V
3.0 V
20 mV/DIV
2.5 V
2.5 V
2.45 V
0.5
µs/DIV
2.0 V
0.1
µs/DIV
4
MOTOROLA ANALOG IC DEVICE DATA
200 mV/DIV
ONSEMI [ ON SEMICONDUCTOR ]
