L4971 datasheet(6/12 Pages) STMICROELECTRONICS

6 / 12 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 3. 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 7. Load regulation

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

100

110

120

130

140

150

Ibias

(

µA)

D97IN732

Tj=25

°C

Tj=125

°C

Vss=GND

Figure 5. Stand-by drain current vs. input

voltage

-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 4. 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 8. 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 6. Line Regulation

L4971

6/12

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