L4981X datasheet(6/16 Pages) STMICROELECTRONICS

Part #	L4981X

Description	POWER FACTOR CORRECTOR

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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6 / 16 page

ELECTRICAL CHARACTERISTICS (continued)

Symbol

Prameter

Test Condition

Min.

Typ.

Max.

Unit

MULTIPLIER SECTION

Multipler Output Current

VVA-OUT = 4V, VRMS = 2V,

VMULTOUT = 0, VLFF = 5.1V

IAC = 50

µA, COSC = 0V

20

35

52

µA

VVA-OUT = 4V, VRMS = 2V,

VMULTOUT = 0, VLFF = 5.1V

IAC = 200

µA, COSC = 0V

100

135

170

µA

VVA-OUT = 2V, VRMS = 2V,

VMULTOUT = 0, VLFF = 5.1V

IAC = 100

µA, COSC = 0V

10

20

30

µA

VVA-OUT = 2V, VRMS = 4V,

VMULTOUT = 0, VLFF = 5.1V

IAC = 100

µA, COSC = 0V

25.5

11

µA

VVA-OUT = 4V, VRMS = 4V,

VMULTOUT = 0, VLFF = 5.1V

IAC = 100

µA, COSC = 0V

10

22

34

µA

VVA-OUT = 4V, VRMS = 2V,

VMULTOUT = 0, VLFF = 2.5V

COSC = 0V, IAC = 200

µA

20

37

54

µA

VVA-OUT = 4V, VRMS = 4V

VMULTOUT = 0, VLFF = 5.1V

IAC = 200

µA, COSC = 0V

20

39

54

µA

VVA-OUT = 2V, VRMS = 4V,

VMULTOUT = 0, VLFF = 5.1V

IAC = 0, COSC = 0V

-2

0

2

µA

K

Multiplier Gain

0.37

IMULT−OUT = K ⋅ IAC

(VVA−OUT − 1.28) ⋅ (0.8 ⋅ VLFF − 1.28)

(VVRMS)2

if VLFF = VREF;

IMULT−OUT = IAC

(VVA−OUT − 1.28)

(VVRMS)

2

⋅ K1

where: K1 = 1V

Figure 1: MULTI-OUT vs. IAC (VRMS = 1.7V;

VLFFD = 5.1V)

Figure 2: MULTI-OUT vs. IAC (VRMS = 2.2V;

VLFFD = 5.1V)

L4981A - L4981B

6/16

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