L4971D(2000) 查看數據表（PDF） - STMicroelectronics

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L4971D
(Rev.:2000)

1.5A STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

Figure 21. Load transient.

L4971

Figure 22. Line transient.

VCC

(V)

30

D97IN786

20

10

1

VO

(mV)

IO = 1A

fsw = 100KHz

100

2

0

1ms/DIV

-100

Figure 23. Soft start capacitor selection Vs in-

ductor and Vccmax.

L

(µH)

fsw=100KHz

680nF

D97IN745

470nF

400

330nF

300

200

220nF

100

100nF

0

15 20 25 30 35 40 45 50 VCCmax(V)

Figure 25. Open loop frequency and phase of er-

ror amplifier

GAIN

(dB)

D97IN787

Phase

50

GAIN

0

0

-50

45

-100

-150

Phase

90

135

-200

10 102 103 104 105 106 107 108 f(Hz)

Figure 24. Soft start capacitor selection vs. In-

ductor and Vccmax.

L

(µH)

fsw=200KHz

D97IN746

56nF

300

47nF

200

33nF

22nF

100

0

15 20 25 30 35 40 45 50 VCCmax(V)

9/12

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