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LTC2972 Datasheet(PDF) 98 Page - Linear Technology

Part # LTC2972
Description  2-Channel PMBus Power System Manager Featuring Programmable Power Good Outputs
PDF  112 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2972 Datasheet(HTML) 98 Page - Linear Technology

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LTC2972
98
2972fa
For more information www.linear.com/LTC2972
APPLICATIONS INFORMATION
Figure 33. Aborted On-Sequence Due to Channel 1 Short
Figure 34. Application Circuit for DC/DC Converters with External Feedback Resistors
VCONTROL
VOUT0
TON_DELAY0
VOUT1
VOUT2
VOUTn
BUSSED
VFAULTBn PINS
TON_MAX_FAULT1
2972 F33
TON_DELAY1
TON_DELAY2
TON_DELAYn
•
•
•
•
•
•
APPLICATION CIRCUITS
Trimming and Margining DC/DC Converters with
External Feedback Resistors
Figure 34 shows a typical application circuit for trimming/
margining a power supply with an external feedback
network. The VSENSEP0 and VSENSEM0 differential inputs
sense the load voltage directly, and a correction voltage
is developed on the VDAC0 pin by the closed-loop servo
algorithm. The VDAC0 output is connected to the DC/DC
converter’s feedback node through resistor R30. For this
configuration, set Mfr_config_dac_pol to 0.
Four-Step Resistor Selection Procedure for DC/DC
Converters with External Feedback Resistors
The following four-step procedure should be used to
calculate the resistor values required for the application
circuit shown in Figure 34.
1. Assume values for feedback resistor R20 and the
nominal DC/DC converter output voltage VDC(NOM),
and solve for R10.
VDC(NOM) is the output voltage of the DC/DC converter
when the LTC2972’s VDAC0 pin is in a high impedance
state. R10 is a function of R20, VDC(NOM), the voltage
at the feedback node (VFB) when the loop is in regula-
tion, and the feedback node’s input current (IFB).
VIN
R20
R10
R30
LOAD
VOUT
VFB
VIN
RUN
DC/DC
CONVERTER
VSENSEM
VDAC
VOUT_EN
VPWR
FAULT
SDA
SCL
ALERTB
CONTROL
PMBus
INTERFACE
VSENSEP
16-BIT
ADC
CONTROL
LOGIC
EEPROM
10-BIT
DAC
LTC2972
OV/UV
SUPERVISOR
2972 F34



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