參數(shù)資料
型號(hào)： SMM665BFR2
廠商： Summit Microelectronics, Inc.
英文描述： Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer
中文描述： 六通道有源直流輸出控制器，監(jiān)視器，Marginer和音序器
文件頁(yè)數(shù)： 13/30頁(yè)
文件大小： 872K
代理商： SMM665BFR2
SMM665B
Preliminary Information
Summit Microelectronics, Inc
2089 1.1 10/20/04
13
APPLICATIONS INFORMATION
DEVICE OPERATION
POWER SUPPLY
The SMM665B can be powered by either a 12V input
through the 12VIN pin or by a 3.3V or 5.0V input
through the VDD pin. The 12VIN pin feeds an internal
programmable regulator that internally generates
either 5.5V or 3.6V. A voltage arbitration circuit allows
the device to be powered by the highest voltage from
either the regulator output or the VDD input. This
voltage arbitration circuit continuously checks for these
voltages to determine which will power the SMM665B.
The resultant internal power supply rail is connected to
the VDD_CAP pin that allows both filtering and hold-
up of the internal power supply. To ensure that the
input voltage is high enough for reliable operation, an
under voltage lockout circuit holds the controlled
supplies off until the UVLO thresholds are met.
MODES OF OPERATION
The SMM665B has four basic modes of operation
(shown in Figures 5 through 8): Power-on cascade
sequencing mode, ongoing operations-monitoring
mode, supply margining mode and Power-off cascade
sequencing mode. In addition, there are two features:
ADOC and forced shutdown which can be used during
monitoring and margining mode. A detailed description
of each mode and feature follows.
ACTIVE DC OUTPUT CONTROL (ADOC
TM
)
The SMM665B can actively control the DC output
voltage of bricks or DC/DC converters that have a trim
pin during monitoring and margining mode. The
converter may be an off-the shelf compact device, or
may be a “roll your own” circuit on the application
board. In either case, the SMM665B dramatically
improves voltage accuracy (down to 0.2%) by
implementing closed-loop ADOC active control. This
utilizes the DC-DC’s “trim” pin as shown in Figure 12,
or an equivalent output voltage feedback adjustment
“VADJ” or “FB” node in a user’s custom circuit, Figure
13. Each of the TRIM
X
pins on the SMM665B is
connected to the trim input pins on the power supply
converters. A sense line from the channel’s point-of-
load connects to the corresponding VM input. The
ADOC function cycles through all six channels (A-F)
every 1.7ms making slight adjustments to the voltage
on the associated TRIM
X
output pins based on the
voltage inputs on the VM
X
pins. These voltage
adjustments allow the SMM665B to control the output
voltage of power supply converters to within ±0.2%
when using a ±0.1% external voltage reference.
Figure 7 - Waveform shows four SMM665B channels
exhibiting Sequence-on to Nominal voltage, Margin
High or Low, Nominal voltage and then sequence-off
Ch 1 = 2.5V DC-DC converter output (Yellow trace)
Ch 2 = 1.8V DC-DC converter output (Blue trace)
Ch 3 = 1.5V DC-DC converter output (Purple trace)
Ch 4 = 1.2V DC-DC converter output (Green trace
Figure 8 - Waveform shows two SMM665B channels
Sequencing-on to Nominal voltage, Margin High and
Low, and then sequence-off. Channel 3 and 4 shows
the RST and HEALTHY signals.
Ch 1 = 2.5V DC-DC converter output (Yellow trace)
Ch 2 = 1.5V DC-DC converter output (Blue trace)
Ch 3 = RST signal output (Purple trace)
Ch 4 = HEALTHY signal output (Green trace
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