REV. 0

–2–

EVAL-ADM1070EB

3. If the default timing values are suitable, place Switch S2 in its

default position (toward S1), tying the TIMER pin directly to

–48 V. If different timing values are required, Switch S2 to its

secondary position. TIMER is now tied to –48 V through the

external capacitor C2. The default capacitor value is 220 pF.

This capacitor can be changed to generate a different set of

timing values. See Table III of the ADM1070 data sheet for a

full list of capacitor values and the corresponding timing values.

SWITCH FUNCTIONS

There are three switches on the ADM1070 Evaluation Board

(S1–S3). All switch left/right directions are indicated with the

ADM1070 Board in upright position (i.e., red banana connec-

tor at the bottom left corner of the board).

Switch 1 (S1):

Right Position: Normal operation. The R1-R2 resistor divider

generates a voltage level proportional to the supply voltage.

This signal is fed into the UV/OV pin of the ADM1070 for

undervoltage/overvoltage detection.

Left Position: Disconnects the on-board resistor divider from

the ADM1070. An external signal can then be fed directly to

UV/OV via the SMB connector J7 for testing purposes (i.e., to

manually generate an overvoltage/undervoltage fault).

Switch 2 (S2):

Right Position: Ties the ADM1070 TIMER pin directly to

–48 V. ADM1070 uses its default timing values.

Left Position: Ties the ADM1070 TIMER pin to –48 V

through external capacitor C2. ADM1070 timing values now

depend on the capacitor value (see ADM1070 data sheet for

timing values for various capacitor values). Default external

capacitor value is 220 pF.

Switch 3 (S3):

Right Position: Normal operation. Voltage across the sense

resistor is fed into the SENSE pin of the ADM1070. This volt-

age is used to detect overcurrent faults.

Left Position: Disconnects the on-board sense voltage from

the ADM1070. An external signal can then be fed directly to

SENSE via the SMB connector J6 for testing purposes (i.e., to

manually generate an overcurrent fault).

CONNECTORS

There are nine connectors on the ADM1070 Evaluation Board (J1–J9).

J1 (Banana Connector-Red):

0 V Input Voltage Line

J2 (Banana Connector-Blue/Black):

–48 V Input Voltage Line (Diode OR-ed)

J3 (Banana Connector-Blue/Black):

–48 V Input Voltage Line (Diode OR-ed)

J4 (Banana Connector-Blue/Black):

–48 V Input Voltage Line (No Diode OR-ing)

J5 (SMB Connector):

J6 (SMB Connector):

External SENSE voltage can be applied at J6 via Switch S3.

J7 (SMB Connector):

External UV/OV voltage can be applied at J7 via Switch S1.

J8 (Edge Connector):

Allows connection of a backplane board for powering the board

and simulation of hot swap events.

J9 (Edge Connector):

Allows connection of a load board for simulation of hot

swap events.

IMPORTANT

The following precautions are recommended when using the

ADM1070 Evaluation Kit under high voltage conditions:

• Do not work alone.

• Always keep one hand in your pocket or behind your back

when around a high voltage system.

• Wear footwear with a rubber bottom.

• Wear eye protection (safety goggles).

• Do not wear any jewelry or other articles that could acci-

dentally contact circuitry and conduct current.

• Set up your work area away from possible grounds that you

may accidentally contact.

• Work on an antistatic mat.

• Connect/disconnect any test leads with the equipment

unpowered and unplugged. Use clip leads or solder

temporary wires to reach locations difficult to access.

• Perform as many tests as possible with power off and the

equipment unplugged.

• After tests performed with the power applied, turn off the

power and disconnect the power supply from the board.

• Remember to fully discharge large load capacitors with an

appropriate resistor.

OPERATING THE ADM1070 EVALUATION BOARD

There are many different tests and hot swap scenarios that can be

modelled on the ADM1070 Evaluation Board:

• An overvoltage condition

• An undervoltage condition

• Powering up into a load (resistive, capacitive, RC

combination)

• Powering up, then applying a load (resistive, capacitive,

RC combination)

• Powering up into a shorted output

• Powering up, then shorting output

• A permanent overcurrent fault

• A temporary overcurrent fault

• A temporary overcurrent fault followed by a permanent

overcurrent fault

• Three distinct levels of overcurrent fault (see the Controlling

the Current section in the ADM1070 data sheet)

Note that all tests involving shorts can be simulated with the

ADM1070 residing on both the plug-in module/board side and

backplane side. See the ADM1070 Application Note for

more details.

The ADM1070 Evaluation Board can be configured in two ways to

emulate the two ways in which the ADM1070 can be used in a real system.