Typical Performance Characteristics: continued
91.5
91.0
90.5
90.0
89.5
89.0
88.5
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
0
10
20
30
40
50
60
70
0
10
20
30
40
50
60
70
Temperature (C)
Temperature (C)
Figure 25: Oscillator Maximum Duty Cycle vs Temperature.
Figure 28: SYNC Threshold vs Temperature.
210
208
206
204
170
165
160
155
150
202
200
145
140
0
10
20
30
40
50
60
70
0
10
20
30
40
50
60
70
Temperature (C)
Temperature (C)
Figure 26: Oscillator Frequency vs Temperature. CT = 330pF, RT =27k
Figure 29: SYNC Input Current vs Temperature (VSYNC = 2.4V).
95
1.2785
1.2780
1.2775
1.2770
150pF
90
85
390pF
80
680pF
1.2765
1.2760
75
70
3.3nF
1.5nF
1.2755
20
22
24
26
28
30
32
34
36
38
40
0
10
20
30
40
50
60
70
RT (kW)
Temperature (C)
Figure 27: Oscillator Duty Cycle vs CT, RT (VIN = 12V, T = 25C).
Figure 30: VFB Reference Voltage vs Temperature.
19
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
