L4976D(2000) 查看數據表（PDF） - STMicroelectronics

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L4976D
(Rev.:2000)

1A STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

Figure 1. Quiescent drain current vs. input

voltage.

Iq

(mA)

5

200KHz

R1=22K

C2=1.2nF

D97IN724

100KHz

4

R1=20K

C2=2.7nF

3

0Hz

2

1

0

Tamb=25°C

0% DC

5 10 15 20 25 30 35 40 45 50

Vcc(V)

Figure 3. Line Regulation

VO

(V)

3.377

3.376

D97IN733

Tj=125°C

3.375

3.374

Tj=25°C

3.373

3.372

3.371

3.370

0 5 10 15 20 25 30 35 40 45 50 VCC(V)

Figure 5. Switching frquency vs. R1 and C2

fsw

(KHz)

500

D97IN784

Tamb=25°C

200

100

50

20

10

0.82nF

1.2nF

2.2nF

3.3nF

4.7nF

5.6nF

5

0

20

40

60

80 R1(KΩ)

L4976

Figure 2. Quiescent current vs. junction

temperature

Iq

(mA)

D97IN731

200KHz

5

R1=22K

C2=1.2nF

4

3

VCC=35V

2

0% DC

100KHz

R1=20K

C2=2.7nF

0Hz

1

-50 -30 -10 10 30 50 70 90 110 Tj(°C)

Figure 4. Load regulation

VO

(V)

3.378

3.376

3.374

3.372

3.370

3.368

3.366

3.364

3.362

3.360

0

D97IN734

VCC=35V

Tj=25°C

Tj=125°C

0.2 0.4 0.6 0.8 1.0 1.2 1.4 IO(A)

Figure 6. Switching Frequency vs. input

voltage.

fsw

(KHz)

D97IN735

107.5

105.0

102.5

Tj=25°C

100.0

97.5

95.0

92.5

90.0

0 5 10 15 20 25 30 35 40 45 50 VCC(V)

5/11

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