L4973 datasheet(5/16 Pages) STMICROELECTRONICS

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Sink Output Current

200

300

µA

Supply Voltage Ripple

Rejection

VCOMP = VFB

CREF =4.7

µF 1-5mA load

current

DC Open Loop Gain

RL =

∞

Transconductance

Icomp = -0.1 to 0.1mA;

Vcomp =6V

2.5

OSCILLATOR SECTION

Ramp valley

0.78

0.85

0.92

Ramp peak

VCC = 8V

1.9

2.1

2.3

VCC = 55V

9.6

10.2

Maximum Duty Cycle

Maximum Frequency

Duty Cycle = 0%; ROSC =

13K

Ω;COSC = 820pF;

500

KHz

SYNC FUNCTION

High Input Voltage

VCC = 8V to 55V

3.5

Low Input Voltage

VCC = 8V to 55V

0.9

Slave Sink Current

0.15

0.25

0.45

Master Output Amplitude

Isource = 3mA

4.5

Output Pulse Width

no load, Vsync = 4.5V

0.20

0.35

µs

(*) Pulse testing with a low duty cycle.

(**) The maximum power dissipation of the package must be observed.

ELECTRICAL CHARACTERISTICS (continued)

L4973

VCC

3 x

C12

4,5,6

13,14,15

7,8

2,3

D97IN515B

(DIP18)

C1=1000

µF/63V

C2=220nF/63V

C3=470nF

C4=1

µF/50V

C5=220pF

C6=22nF

C7=2.7nF

C8=220nF/63V

C0=100

µF/40V(C9,C10,C11)

C12=Optional (220nF)

L1=150

µHK

OOL

µ 77310 - 40 Turns - 0.9mm

R1=9.1K

R2=20K

D1=GI SB560

VO(V)

R3(K

Ω)

R4(K

Ω)

3.3

5.1

2.7

4.7

L4973 V3.3

VO(V)

R3(K

Ω)

R4(K

Ω)

5.1

6.2

9.1

4.7

L4973 V5.1

Figure 1. Evaluation Board Circuit

L4973V3 - L4973V5 - L4973D3 - L4973D5

5/16

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