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LTC3884 Datasheet(PDF) 20 Page - Analog Devices

Part # LTC3884
Description  Quad Output PolyPhase Step-Down DC/DC Voltage Mode Controller with Digital Power System Management
PDF  26 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC3884 Datasheet(HTML) 20 Page - Analog Devices

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LTC7883
20
Rev. 0
For more information www.analog.com
Table 6 shows various PWM phase configurations that
can be selected with external resistor programming. This
RCONFIG pin, as with the LTC3882-1, can also be used
to control SYNC output drive for each LTC7883 unit.
However, there are more choices here, affording greater
flexibility in PolyPhase configurations.
For example, to build a four-phase rail, one approach
might be to select RTOP of 24.9kΩ and RBOT of 5.76kΩ for
PHAS_CFG of Unit A (PCFGA). This programs the phase
angles of PWMA0 to 0° and PWMA1 to 180°, relative to
the falling edge of SYNC. Unit A is enabled to drive the
shared SYNC clock line through the SYNCA pin (open-
drain output).
For Unit B, RTOP of 10kΩ and RBOT of 15.8kΩ selects
phase angles for PWMB0 of 90° and PWMB1 of 270°,
configuring SYNCB as an input to accept the master clock
from Unit A. The result, when wired as a 4-phase rail
as described in PolyPhase Operation and Load Sharing
under Applications Information in the LTC3882-1 data
sheet, will be four non-overlapping phases operating in
quadrature as desired. In this case, either Unit A or Unit
B may be defined and wired as the voltage loop master,
since this function is independent of clock mastering.
Only mix phase selections on PolyPhase rails that have
the same maximum duty cycle specified in Table 6.
APPLICATIONS INFORMATION
Table 6. CFGA/B Resistor Programming
RTOP (kΩ)
RBOT (kΩ)
θSYNC TO θ0
θSYNC TO θ1
MAXIMUM DUTY CYCLE
SYNC OUTPUT DISABLED
0 or Open
Open
From EEPROM
From EEPROM
See MFR_PWM_CONFIG
From EEPROM
10
23.2
135°
315°
87.5%
Yes
10
15.8
90°
270°
16.2
20.5
45°
225°
16.2
17.4
0°
180°
20
17.8
120°
300°
83.3%
Yes
20
15
60°
240°
20
12.7
0°
180°
20
11
0°
120°
24.9
11.3
135°
315°
87.5%
No
24.9
9.09
90°
270°
24.9
7.32
45°
225°
24.9
5.76
0°
180°
24.9
4.32
120°
300°
83.3%
No
30.1
3.57
60°
240°
30.1
1.96
0°
180°
Open
0
0°
120°



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