UCC1895
UCC2895
UCC3895
TYPICAL CHARACTERISTIC
Vcs=0V
Vcs=2V
2000
RT=47K
RT=62k
RT=82k
RT=100k
1800
1600
1400
1200
1000
800
1600
1400
1200
1000
800
600
400
200
0
600
400
200
0
100
1000
0
10
20
RDEL (kΩ)
30
40
CT (pF)
Figure 5. Delay programming: characterizes the
output delay between A/B, C/D.
Figure 8. Frequency vs. RT/CT (oscillator frequency).
Vdd=10V
Vdd=12V
Vdd=15V
Vdd=17V
1
0.95
0.9
9
8
7
6
5
4
0.85
0.8
0
400
800
1200
1600
-60
-40
-20
0
20
40
60
80
100 120
OSCILLATOR FREQUENCY (kHz)
TEMPERATURE (°C)
Figure 6. EAOUT to RAMP offset over temperature.
Figure 9. Idd vs. Vdd / oscillator frequency (no
output loading).
GAIN (dB)
PHASE MARGIN (°C)
Vdd=10V
Vdd=12V
Vdd=15V
Vdd=17V
13
12
11
10
9
100
80
60
40
20
0
200
160
120
80
8
7
6
40
5
4
0
0
400
800
1200
1600
OSCILLATOR FREQUENCY (kHz)
1
100
10000
FREQUENCY (Hz)
1000000
Figure 7. Error amplifier gain/phase margin.
Figure 10. Idd vs. Vdd / oscillator frequency (with
0.1nf output loads).
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 • FAX (603) 424-3460
10
ETC [ ETC ]
