L4971D(2000) 데이터 시트보기 (PDF) - STMicroelectronics

부품명

상세내역

제조사

L4971D
(Rev.:2000)

1.5A STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

L4971

Figure 3. 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 5. Stand-by drain current vs. input

voltage

Ibias

(µA)

D97IN732

150

Vss=GND

140

Tj=25°C

130

120

110

100

Tj=125°C

90

80

70

60

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

Figure 7. 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)

6/12

Figure 4. 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 6. 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 8. Switching frquency vs. R1 and C2

fsw

(KHz)

500

200

100

50

20

10

D97IN784

Tamb=25°C

0.82nF

1.2nF

2.2nF

3.3nF

4.7nF

5.6nF

5

0

20

40

60

80 R1(KΩ)

Share Link: