LX1675 Ver la hoja de datos (PDF) - Microsemi Corporation
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LX1675 Datasheet PDF : 19 Pages
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LX1675
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 © 2004
Rev. 1.2a, 2006-02-16
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 11
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