L4978 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

1.0 1.2 1.4 1.6

IO(A)

0.8

1.8

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

D98IN835

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

L4978

6/12

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