L5971D datasheet(6/11 Pages) STMICROELECTRONICS

6 / 11 page

Vcc(V)

(mA)

200KHz

R1=22K

C2=1.2nF

0Hz

D98IN942

Tamb=25

°C

0% DC

100KHz;

R1=20K

C2=2.7nF

Figure 3. Quiescent drain current vs. input

voltage.

25 VCC(V)

100

110

120

130

140

150

Ibias

(

µA)

D98IN944

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)

D98IN943

0Hz

200KHz; R1=22K; C2=1.2nF

VCC=20V

0% DC

100KHz; R

1=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 7. Switching frquency vs. R1 and C2

25 VCC(V)

3.370

3.371

3.372

3.373

3.374

3.375

3.376

3.377

(V)

D98IN945

Tj=25

°C

Tj=125

°C

Figure 6. Line Regulation

25 VCC(V)

90.0

92.5

95.0

97.5

100.0

102.5

105.0

107.5

fsw

(KHz)

D98IN947

Tj=25

°C

Figure 8. Switching Frequency vs. input

voltage.

L5971

6/11

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