CS51022EDR16 datasheet(8/9 Pages) CHERRY

Part #	CS51022EDR16

Description	Enhanced Current Mode PWM Controller

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Manufacturer	CHERRY [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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CS51022EDR16 Datasheet(PDF) 8 Page - Cherry Semiconductor Corporation

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