參數(shù)資料
型號： SMM465FR05
廠商： Summit Microelectronics, Inc.
英文描述： 4-Channel Active DC Output Controller, Monitor, Marginer and Sequencer
中文描述： 4通道有源直流輸出控制器，監(jiān)視器，Marginer和音序器
文件頁數(shù)： 14/30頁
文件大小： 957K
代理商： SMM465FR05
SMM465
Preliminary Information
Summit Microelectronics, Inc
2085 1.1 05/27/04
14
A pulse of current, either sourced or sunk for 5μs
every 1.7ms, to the capacitors connected to the
TRIM_CAP
X
pins adjusts the voltage output on the
TRIM
X
pins. The voltages on the TRIM_CAP
X
pins are
buffered and applied to the TRIM
X
pins. The voltage
adjustments on the TRIM
X
pins cause a slight ripple of
less than 1mV on the power supply voltages. The
amplitude of this ripple is a function of the TRIM_CAP
capacitor and the trim gain of the converter.
Application Note 37 details the calculation of the
TRIM_CAP capacitor to achieve a desired minimum
ripple.
Each channel can be programmed to either enable or
disable the Active DC Control function. When
disabled or not active, the TRIM
X
pins on the SMM465
are high impedance inputs. If disabled and not used,
they can be connected to ground. The voltages on the
TRIM
X
pins are buffered and applied to the
TRIM_CAP
X
pins charging the capacitors. This allows
a smooth transition from the converter powering up to
its nominal voltage; to the SMM465 controlling that
voltage, and to the Active DC Control nominal setting.
The pulse of current can be increased to a 10X pulse
of current until the power supply voltages are at their
nominal settings by selecting the programmable
Speed-Up Convergence option. As the name implies,
this option decreases the time required to bring a
supply voltage from the converter’s nominal output
voltage to the Active DC Control nominal voltage
setting.
POWER-ON CASCADE SEQUENCING
The SMM465 can be programmed to sequence up to
four power supplies in any order. Each of these four
channels (A-D) has an associated open drain PUP
output that, when connected to a converter’s enable
pin, controls the turn-on of the converter. The
channels are assigned sequence positions to
determine the order of the sequence. Any channel
can also be programmed to not take part in the
sequencing in applications with fewer than four
supplies. The polarity of each of the PUP
X
outputs is
programmable for use with various types of
converters.
Power-on sequencing can be initiated by the
PWR_ON/OFF pin or via I
C control. The polarity of
the PWR_ON/OFF pin is programmable. If hard wired
in its active state the SMM465 will automatically
initiate the Power-on sequence. Otherwise, toggling
the PWR_ON/OFF pin to its active state will initiate the
Power-on sequence. To enable software control of
the sequencing feature, the SMM465 offers an I
2
C
command to initiate Power-on sequencing while the
PWR_ON/OFF pin is in its inactive state.
The SMM465 can be programmed to wait until either
or both VDD and 12VIN inputs are within their
respective voltage threshold limits before Power-on
sequencing is allowed to begin. This ensures that the
converters have their full supply voltage before they
are enabled.
Once Power-on sequencing begins, the SMM465 will
wait a Power-on delay time (t
DPON
) for any channel in
the first sequence position (0) and then activate the
PUP
X
outputs for those channels. The Power-on
delay times are individually programmable for each
channel. The SMM465 will then wait until all VM
X
inputs of the channels assigned to the first sequence
position (0) are above their programmed UV1
thresholds which is called cascade sequencing. At
this point, the SMM465 will enter the second sequence
position (1) and begin to timeout the Power-on delay
times for the associated channels. This process
continues until all of channels in the sequence have
turned on and are above their UV1 threshold. The
status registers indicates that all sequenced power
supply channels have turned on. Once these
channels are above their UV1 thresholds, the
SMM465 will begin the Active DC Control of the
enabled channels. The Power-on sequencing mode
ends when the Active DC Controlled channels are at
their nominal voltage setting. The “Ready” bit in the
status registers signifies that the voltages are at their
set points.
The programmable sequence termination timer can be
used to protect against a stalled Power-on sequence.
This timer resets itself at the beginning of each
sequence position. All channels in the sequence
position must go above their UV1 threshold before the
sequence termination timer times out (t
STT
)
or the
sequence will terminate and all PUP
X
outputs will be
switched to their inactive state. The status registers
contain bits that indicate the sequence has been
terminated and in which sequence position the timer
timed out. This timer has four settings of OFF, 100ms,
200ms and 400ms.
APPLICATIONS INFORMATION (CONTINUED)
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