L4974 Просмотр технического описания (PDF) - STMicroelectronics

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производитель

L4974

3.5A SWITCHING REGULATOR

STMicroelectronics 

L4974A

ELECTRICAL CHARACTERISTICS (continued)

DC CHARACTERISTICS

Symbo l

Pa ram et er

V11on

V11 Hyst

Turn-on Threshold

Turn-off Hysteresys

I11Q

I11OQ

I20L

Quiescent Current

Operating Supply Current

Out Leak Current

SOFT START (pin 8)

T est Cond ition

V8 = 0; S1 = D

V8 = 0; S1 = B; S2 = B

Vi = 55V; S3 = A; V8 = 0

Min.

10

Symbo l

I8

V8

Pa ram et er

Soft Start Source Current

Output Saturation Voltage

ERROR AMPLIFIER

T est Cond ition

V8 = 3V; V9 = 0V

I8 = 20mA; V11 = 10V

I8 = 200µA; V11 = 10V

Min.

80

Symbo l

Pa ram et er

V7H

High Level Out Voltage

V7L

Low Level Out Voltage

I7H

Source Output Current

-I7L

Sink Output Current

I9

Input Bias Current

GV

DC Open Loop Gain

SVR Supply Voltage Rejection

VOS

Input Offset Voltage

RAMP GENERATOR (pin 18)

T est Cond ition

I7 = -100µA; S1 = C

V9 = 4.7V

I7 = 100µA; S1 = C

V9 = 5.3V;

V7 = 1V; V7 = 4.7V

V7 = 6V; V9 = 5.3V

S1 = B; RS = 10KΩ

S1 = A; RS = 10Ω

15 < Vi < 50V

RS = 50Ω S1 = A

Min.

6

100

100

60

60

Symbo l

V18

V18

Pa ram et er

Ramp Valley

Ramp Peak

I18

Min. Ramp Current

I18

Max. Ramp Current

SYNC FUNCTION (pin 10)

T est Cond ition

S1 = B; S2 = B

S1 = B

S2 = B

Vi = 15V

Vi = 45V

S1 = A; I17 = 100µA

S1 = A; I17 = 1mA

Min.

1.2

2.4

Symbo l

V10

V10

+I10L

+I10H

V10

tW

Pa ram et er

T est Cond ition

Low Input Voltage

Vi = 15V to 50V; V8 = 0;

S1 = B; S2 = B; S4 = B

High Input voltage

V8 = 0;

S1 = B; S2 = B; S4 = B

Sync Input Current with Low V10 = V18 = 0.9V; S4 = B;

Input Voltage

S1 = B; S2 = B

Input Current with High V10 = 2.5V

Input Voltage

Output Amplitude

Output Pulse Width

Vthr = 2.5V

Min.

–0.3

2.5

4

0.3

Typ.

11

1

13

16

Max.

12

19

23

2

Typ.

115

Max.

150

1

0.7

Typ. Max.

1.2

150

150

0.4

3

80

2

10

Typ.

1.5

2.5

5.5

270

2.7

Max.

300

Typ.

Max.

0.9

5.5

0.4

1.5

5

0.5

0.8

Unit

V

V

mA

mA

mA

Unit

µA

V

V

Unit

V

V

µA

µA

µA

dB

dB

mV

Unit

V

V

V

µA

mA

Unit

V

V

mA

mA

V

µs

Fig.

7A

7A

7A

7A

7A

Fig.

7B

7B

7B

Fig.

7C

7C

7C

7C

7C

7C

7C

7C

Fig.

7A

7A

7A

7A

7A

Fig.

7A

7A

7A

7A

–

–

8/22

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