LX1671CLQ-TR Просмотр технического описания (PDF) - Microsemi Corporation

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LX1671CLQ-TR

Multiple Output LoadSHARE™ PWM

Microsemi Corporation 

LX1671

TM

®

Multiple Output LoadSHARE™ PWM

PRODUCTION DATA SHEET

THEORY OF OPERATION (CONTINUED)

L1,

Switch

Side

Phase 2

Error Amp

100

62k LPF1 RF2

Not

Resistor

Used

Divider

4700pF

-

L2,

Switch Resistor

Side Divider

FB2

62k LPF2 62k

100

TBD

4700pF

+5V @ 7W

1.5V

+46.7mV

PWM

Input

Offset

Voltage

Generator

V1

ESR L1

10mΩ

Phase 1

-

+

4.67A

Vou

1.5V @ 12A

18W

1.5V

+73.3mV

V2

ESR L2

10mΩ

Phase 2

7.33A

+3.3V @ 11W

Figure 8 – LoadSHARE Using Feedback Divider Offset

V1

Where V1 = 1.5467 ; V2 = 1.5733 and K = then

TBD = K × 100 = 5.814 K

V2

1− K

Copyright © 2000

Rev. 1.2b, 2006-02-13

Microsemi

Integrated Products, Power Management

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 13

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