L4976 datasheet(5/11 Pages) STMICROELECTRONICS

5 / 11 page

5 10 15 20 25 30 35 40 45 50

Vcc(V)

(mA)

200KHz

R1=22K

C2=1.2nF

0Hz

D97IN724

Tamb=25

°C

0% DC

100KHz

R1=20K

C2=2.7nF

Figure 1. Quiescent drain current vs. input

voltage.

0.2

0.4

0.6

0.8

1.0

1.2

1.4 IO(A)

3.360

3.362

3.364

3.366

3.368

3.370

3.372

3.374

3.376

3.378

(V)

Tj=25

°C

Tj=125

°C

VCC=35V

D97IN734

Figure 4. Load regulation

-50 -30 -10 10 30 50 70 90 110

Tj(

°C)

(mA)

D97IN731

0Hz

200KHz

R1=22K

C2=1.2nF

VCC=35V

0% DC

100KHz

R1=20K

C2=2.7nF

Figure 2. Quiescent current vs. junction

temperature

R1(K

Ω)

100

200

500

fsw

(KHz)

D97IN784

0.82nF

1.2nF

2.2nF

3.3nF

4.7nF

5.6nF

Tamb=25

°C

Figure 5. Switching frquency vs. R1 and C2

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

3.370

3.371

3.372

3.373

3.374

3.375

3.376

3.377

(V)

D97IN733

Tj=25

°C

Tj=125

°C

Figure 3. Line Regulation

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

90.0

92.5

95.0

97.5

100.0

102.5

105.0

107.5

fsw

(KHz)

D97IN735

Tj=25

°C

Figure 6. Switching Frequency vs. input

voltage.

L4976

5/11

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