ADM1041-EVAL Analog Devices Inc, ADM1041-EVAL Datasheet - Page 18

• 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
Mnemonic
Pulse_OK
AC Hysteresis
AC
Soft-start
V
V
AutoRestart Mode
V
GND–MON
DD
DD
REF
SENSE
–OVP
–UVL
–MON
2
Description
As well as providing ac sense, the preceding connection to the transformer is used to gate the
operation of the OrFET circuit. If the output of the transformer is good and has no problems, the
OrFET circuit allows gate drive to the OrFET.
AC Sense Hysteresis. Configurable voltage on the ac sense input allows the ac sense upper and lower
threshold to be adjusted to suit different amounts of low frequency ripple present on the bulk
capacitor.
An alternate form of ac sense can be accepted by the ASIC. This may in the form of an opto-coupled
signal from the primary side where the actual level sensing might be done. As with the above, while
ac is low and UVB is disabled, AC_OK is false and DC_OK is true. Any brownout protection that might
be required on the primary is done on the primary side.
At start-up, the voltage reference to the voltage error amplifier is brought up slowly in approximately
127 steps to provide a controlled rate of rise of the output voltage.
An OVP fault on the auxiliary supply to the ASIC causes a standard OVP operation (see the OVP
function).
A UVL fault on the auxiliary supply to the IC causes a standard UVP operation (see the UVP function).
In this mode, the housekeeping circuit attempts to restart the supply after an undervoltage event at
about 1 second intervals. No other fault can initiate auto-restart.
The internal precision reference is monitored by a separate reference for overvoltage and allows truly
redundant OVP. The externally available reference is also monitored for an undervoltage that would
indicate a short on the pin.
The internal ASIC ground is constantly monitored against the remote sense negative pin. If the chip
ground goes positive with respect to this pin, it indicates that the chip ground is open-circuit either
inside the ASIC or the external wiring. The ASIC would be latched off, similar to an OV event.
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