NE5560NB 查看數據表（PDF） - Philips Electronics
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NE5560NB Datasheet PDF : 16 Pages
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Philips Semiconductors
Switched-mode power supply control circuit
Product specification
NE/SE5560
1994 Aug 31
δ MAX (%)
100
90
80
R1
70
60
50
R2
40
30
20
10
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
R2
R1 * R2
Figure 12. Graph for Determining δMAX
2
DUTY
CYCLE
6 CONTROL
12
δ (%)
80
70
δMAX 90%
60 δMAX 70%
50
40 δMAX 50%
30 δMAX 30%
20
10
103
2
3 4 5 6 7 8 9 104
R1 + R2
2
(Ω)
Figure 13. Soft-Start Minimum Duty Cycle vs R1 + R2
0.6V
0.48V
from
PWM
START
STOP
RESET
OF OUTPUT
BISTABLE
11
Figure 14. Current Protection Input
11
SL00371
SL00372
SL00373
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