Linear Technology LTC2920-1CS5 User manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 563

SINGLE AND DUAL MARGINING CONTROLLER

LTC2920-1CS5

LTC2920-2CMS8

DESCRIPTION

Demonstration circuit 563 contains two separate cir-

cuits: a (single channel) LTC2920-1 and a (dual chan-

nel) LTC2920-2 Power Supply Margining Controllers.

This board is meant to be connected to up to three

power supplies and demonstrates the voltage margin-

ing capabilities of the LTC2920. The board is scribed

for easy separation of the two circuits if desired.

Each circuit contains a Margining Controller, bypass

capacitor, and pads for external connections. There

are also component locations for adding 0805 resis-

tors. These resistors are specific to each applica-

tion and must be installed to demonstrate Voltage

Margining.

Design files for this circuit board are available. Call

the LTC factory.

QUICK START PROCEDURE

Referring to Figure 1, the Vcc1 and Gnd1 pins provide

the power and ground connections for the LTC2920-1

(single). The Vcc2 and Gnd2 pins provide the power

and ground connections for the LTC2920-2 (dual).

The Vcc voltage can generally be varied between 2.2V

and 6.0V. Vcc must be at least 0.6 volts higher than

the voltage at the Im pin. See the LTC2920 Data

Sheet for other design considerations on minimum

Vcc voltage and Vcc filtering. Be sure to connect the

ground pin(s) to the same ground as the power sup-

ply(s) being margined.

For margining power supplies with external feedback

resistors, the Im pins should be connected to the

power supply feedback node. For margining power

supplies using trim pins, the Im pin should be con-

nected to the power supply trim pin.

The Imargin current sourced or sunk from each Im

pin is individually programmed by its respective on

board Rset resistor. For the LTC2920-1 circuit, there

are two possible locations for the Rset resistor. Plac-

ing the Rset resistor in the ‘RLOW’ position will pro-

gram the Imargin current at 1V / Rset. Placing the

Rset resistor in the ‘RHI’ position will program the

Imargin current at 30 * 1V / Rset. See the LTC2920

Data Sheet for the specification limits of the high and

low current ranges. On the LTC2920-2 circuit, there

are two positions for each of the two Rset resistors.

The ‘R1L’ and ‘R2L’ positions are similar to the

‘RLOW’ position described above. The ‘R1H’ and

‘R2H’ positions are similar to the ‘RHI’ position de-

scribed above.

The In pins can be connected to a system controller

that has a 3-state output, or manually connected as

shown. When using a 3-state output to control the In

pin, placing the (3-state) output in the high-Z state

will ‘float’ the In pin, and cause the controlled Im pin

to be in a high impedance state. Raising an In pin

above 2.0 Volts will cause its respective Im pin to

sink current. Lowering an In pin below 0.6 Volts will

cause its respective Im pin to source current. See the

LTC2920 Data Sheet for details. The In pins may also

be controlled manually by connecting them to Vcc,

ground, or left floating.

After calculating and inserting the Rset resistor(s) as

described above, place the DC563 board as close as

possible to the power supplie(s) being margined. The

ground, Vcc, and Im pins should be connected with

the shortest practical wires.

With power applied, the power supply output(s)

should be at their nominal values with the In pin(s)

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 563

SINGLE AND DUAL MARGINING CONTROLLER

floating. Raising the In pin(s) above 2.0 V will cause

the power supply output voltage to increase by the

desired margin voltage. Lowering the In pin(s) below

0.6 V will cause the power supply output voltage to

decrease by the desired margin voltage. When con-

nected to ‘trim’ pins on DC to DC modules, the po-

larity of the voltage margining may be inverted.

If the LTC2920 Vcc pin is connected to power sup-

plies that are compensated to be only ‘marginally sta-

ble,’ oscillations may be observed. If oscillations are

observed while margining a power supply, connect

the Vcc pin to the power supply using an axial lead

resistor instead of a wire. See the LTC2920 Data

Sheet for calculating the value of this resistor.

Figure 1. Proper Measurement Equipment Setup

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 563

SINGLE AND DUAL MARGINING CONTROLLER

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