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CS51021 датащи(PDF) 8 Page - Cherry Semiconductor Corporation

номер детали CS51021
подробное описание детали  Enhanced Current Mode PWM Controller
PDF  9 Pages
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производитель  CHERRY [Cherry Semiconductor Corporation]
домашняя страница  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS51021 датащи(HTML) 8 Page - Cherry Semiconductor Corporation

  CS51021 Datasheet HTML 1Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 2Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 3Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 4Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 5Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 6Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 7Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 8Page - Cherry Semiconductor Corporation CS51021 Datasheet HTML 9Page - Cherry Semiconductor Corporation  
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8
timing capacitor’s discharge current is trimmed, the maxi-
mum duty cycle is well defined. It is determined by the
ratio between the timing resistor RT and the timing capaci-
tor CT. Refer to figures 5 and 6 to select appropriate values
for RT and CT.
fSW =
; TSW = tCH + tDIS
Figure 5: Frequency vs. RT for Discrete Capacitor Values.
Figure 6: Duty Cycle vs. RT for Discrete Capacitor Values.
90
80
70
60
50
40
10
15
20
25
30
35
540
45
50
RT (kΩ)
2
3
4
5
6
7
8
55
100
1
1. CT = 47pF
2. CT = 100pF
3. CT = 150pF
4. CT = 220pF
5. CT = 390pF
6. CT = 470pF
7. CT = 560pF
8. CT = 680pF
2500
2000
1500
1000
500
0
10
15
20
25
30
35
540
45
50
RT (kΩ)
1
2
3
4
5
6
7
8
1. CT = 47pF
2. CT = 100pF
3. CT = 150pF
4. CT = 220pF
5. CT = 390pF
6. CT = 470pF
7. CT = 560pF
8. CT = 680pF
1
TSW
Circuit Description: continued



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