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| SMM465 Datasheet, PDF (20/30 Pages) Summit Microelectronics, Inc. – 4-Channel Active DC Output Controller, Monitor, Marginer and Sequencer | |||
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APPLICATIONS INFORMATION (CONTINUED)
12V
SMM465
Preliminary Information
12V
I2C BUS
SDA
SCL
CS
PUPB
TRIMB
VMB+
Not all components Shown
For interface purposes only
Part designators are from
the International Rectifier
iP1202 Demo board .
SMM465
PUPA
TRIMA
VMA+
C8 Rtrim
1.6K
R9
R7
VOUT1
1.5V
C7
Rtrim
3.3K
R10
R8
VOUT2
2.5V
SS1
FB1
VSW1
FB1S
SS2
FB2 IR
iP1202
VSW2
FB2S
Figure 12 â The SMM465 can be used to sequence and control discrete DC switching regulators. The ADOC
function sets the output voltage of the IR iP1202 Regulator through the FBX feedback pins. Accuracy is
improved even under full load, essentially acting as a âSENSEâ pin. The sequence function is applied
through the iP1202 SSX soft start pins.
Figure 13 â Ch1 is set to 2.5V and Ch2 is set to
1.5V on the ip1202 board. Ch1 is set to sequence
on first followed by Ch2 after 50ms. Then Ch1 is
margined high while Ch2 is margined low. Ch2 is
then sequenced off followed by Ch1 after 50ms.
Figure 14 â This is the same sequencing-on
function but with a shorter delay between
channels, the HEALTHY and RESET flags are also
shown.
Summit Microelectronics, Inc
2085 1.1 05/27/04
20
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