ADM1041-EVAL Analog Devices Inc, ADM1041-EVAL Datasheet - Page 30

• Manufacturer Part Number: ADM1041-EVAL
• Description: BOARD EVALUATION ADM1041
• Manufacturer: Analog Devices Inc

Specifications of ADM1041-EVAL

• Main Purpose: AC/DC, Secondary Side
• Outputs And Type: 1, Non-Isolated
• Power - Output: 24W
• Voltage - Output: 12V
• Current - Output: 2A
• Voltage - Input: 85 ~ 132VAC
• Board Type: Fully Populated
• Utilized Ic / Part: ADM1041
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Frequency - Switching: -
• Regulator Topology: -
• Lead Free Status / Rohs Status: Not Compliant

ADM1041
OSCILLATOR AND TIMING GENERATORS
An on-board oscillator is used to generate timing signals. Some
trimming of the oscillator is provided to adjust for variations in
processing.
All timing generated from the oscillator is expected to meet the
same tolerances as the oscillator. Since individual delay counters
are generally two to three bits, the worst error is one clock period
into these counters, which is 25% of the nominal delay period.
None of these tolerances are extremely critical.
LOGIC I/O AND MONITOR PINS
Apart from pins required for the various key analog functions, a
number of pins are used for logic level I/O signals. If the logic
I/O function is not required, the pins may be reconfigured as
general-purpose comparators for analog level monitoring (MON)
and may be additionally configured to have typical OVP and
UVP properties, either positive-going or negative-going,
depending on whether a positive supply output or a negative
supply output is being monitored. When monitoring negative
outputs, a positive bias must be applied via a resistor to V
The status of all protection and monitoring comparators are
held in registers that can be read by a microprocessor via the
SMBus. Certain control bits may be written to via the SMBus.
CBD/ALERT
This pin can be used either as a crowbar driver or as an SMBus
alert signal to indicate that a fault has occurred. It is typically
configured to respond to a variety of status flags, as detailed in
Registers 1Ah and 1Bh. The primary function of this pin is as a
crowbar driver, and as such it should be configured to respond
to the OV fault status flag. It can be configured to respond to
any or all of a variety of fault status flags, including a micro-
processor writable flag, and can be configured as latching or
nonlatching. It may also be configured as an open-drain
N-channel or P-channel MOSFET and as positive or negative
(inverted) logic. A pull-up or pull-down resistor is required.
This pin may be wire-ORed with the same pin on other
ADM1041 ASICs in the power supply.
The alternative function is an SMBus alert output that can be
used as an interrupt to a microprocessor. If a fault occurs, the
microprocessor can then query the ADM1041(s) about the fault
status. This is intended to avoid continuously polling the
ADM1041(s).
Generally, the microprocessor needs to routinely gather other
data from the ADM1041(s), which can include the fault status,
so the ALERT function may not be used. Also, the simplest
microprocessors may not have an interrupt function. This
allows the CBD/ALERT pin to be used for other functions.
REF
.
Rev. A | Page 30 of 64
MON1
This is the alternative analog comparator function for the
Pulse/AC
MON1 is selected, AC
MON2
This is the alternative analog comparator function for the
AC
selected, AC
PEN
This is the power enable pin that turns the PWM converter on
and can be configured as active high or low. This might drive an
opto-isolator back to the primary side or connect to the enable
pin of a secondary-side post regulator.
PSON
This pin is usually connected to the customer’s PSON signal
and, when asserted, causes the ADM1041 to turn on the power
output. It can be configured as active high or low. Alternatively,
a microprocessor can communicate the PSON function to the
ADM1041 using the SMBus. Or the PS
used. When the PSON pin is not used as such it can be
configured as an analog input, MON3.
MON3
This is the alternative analog comparator function for the PSON
pin (Pin 16). The threshold is 1.25 V. When MON3 is selected,
PS ON defaults to off.
DC_OK (PW-OK, PWR Good, Etc.)
This output is true when all dc output voltages are within toler-
ance and goes false to signify an imminent loss of power. Timing
is discussed later. It can be configured as an open-drain N-
channel or P-channel MOSFET and as positive or negative
(inverted) logic. A pull-up or pull-down resistor is required.
This pin may be wire-ORed with the same pin on other
ADM1041 ASICs in the power supply. When the DC_OK pin is
not used as such, it can be configured as an analog input,
MON4.
MON4
This is the alternative analog comparator function for the
DC_OK pin (Pin 17). The threshold is 1.25 V.
V
This pin normally provides a precision 2.5 V voltage reference.
Alternatively, it can be configured as the AC_OK output or as
an analog input, MON5. A load capacitance of 1 nF (typ) is
recommended on V
REF
SENSE
2 pin (Pin 10). The threshold is 1.25 V. When MON2 is
SENSE
SENSE
1 pin (Pin 9). The threshold is 1.25 V. When
2 defaults to true.
REF
SENSE
.
1 defaults to true.
ON
LINK signal may be