DUALASYMA5VGEVB datasheet, PDF

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DUALASYMA5VGEVB: DescriptionEVAL BOARD BUCK CONV DUAL AG; CategoryDevelopment board/suite/development tools; File Size573KB，8 Pages; ManufacturerON Semiconductor; Websitehttp://www.onsemi.cn; Environmental Compliance

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DUALASYMA5VGEVB Overview

EVAL BOARD BUCK CONV DUAL AG

DUALASYMA5VGEVB Parametric

Parameter Name	Attribute value
The main purpose	DC/DC, step down
Output and type	1. Non-isolation
Voltage - Output	0.8 V ~ 1.4 V
Current - Output	20A
Voltage - input	8 V ~ 19 V
Regulator topology	step down
Frequency - Switch	330kHz
Board type	completely filled
What's included	plate
IC/parts used	NCP5386B，NCP5911

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Test Procedure for the DUALASYMA5VGEVB Evaluation Board

Needed Equipment

1 Voltage Sources:

(i) DC Supply Source for Input Voltage:

The input voltage source should be a 0 to 20V DC source. The

input voltage may be increased further depending on the parts that are being used on the

DUALASYMA5VGEVB evaluation board such that the part can withstand the applied voltage. Hence,

based on the required input voltage to be applied, the requirement of the DC power supply varies.

(ii) DC Supply Source for Driver Voltage:

The supply source for the driver should be a 0 to 20V DC

source. The driver voltage varies depending on the type of driver used (i.e.) For NCP5911 driver, the

driver voltage is 5V and for NCP5901 driver, it is 12V.

(iii) DC Supply Source for Controller Voltage:

The supply source for the controller should be able to

supply a 5V DC Source. The controller voltage is always 5V and is not dependent upon the driver used.

2 Electronic Load:

The electronic load supplied to the DUALASYMA5VGEVB evaluation board ranges

from 0A to 25A. Hence a DC current source of 0A to 30A is needed for the evaluation board.

3 Meters to measure voltages and currents:

In the DUALASYMA5VGEVB Evaluation Board, the voltages that are to be measured are V

, V

out

and

drvr

. Similarly, the currents that are to be measured are I

, I

out

and I

drvr

. The set up for measuring these

voltages and currents, and the meters required are shown in

Figure 3.

The currents are measured across

the shunt resistances that are connected across each of the terminals of input, output and driver voltages

as shown in

Figure 3.

For example, the output current is measured as,

. Similarly the input

and driver current can also be measured. The connecting wires from the output terminal to the electronic

load should be thicker in order to avoid losses and to measure the exact voltage at the end of the

terminals.

4 Oscilloscope:

The oscilloscope is used to monitor the switch node waveforms. This should be an

analog or digital oscilloscope set for DC coupled measurement with 50MHz bandwidth. The resolution

can be set at 5V/division vertically and 20ns/division horizontally. The oscilloscope channels can be

connected at various test points such as High Side Driver (JS6), Low Side Driver (JS10), Switch Node

(JS8), G1 PWM Signal (JS11), V

in (sense)

(J9 & J10) and V

out (sense)

(J11 & J12).

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Start up and Shut down procedures

Before starting the test, the oscilloscope probes should be connected. IR or k-type thermo-couples can be

used to monitor the temperature of the parts to make sure that they are still within the limits. IR monitoring

requires the removal of the oscilloscope probes due to the IR beam interference.

Start up procedure:

(1) Set the output voltage by changing the VID settings. The output voltage should not be changed with

either the controller or driver active. Currently set at 1.2V. (Please refer to the NCP5386 Datasheet

for changing the VID Settings).

(2) Initially set all the power supplies to 0V.

(3) Set the controller voltage to 5V.

(4) Set the driver voltage and then set the input voltage.

(5) Set the load current to required value. The load current must be incremented slowly to prevent the

transient spikes at CS1/CS2 thereby shutting down the controller. If the controller shuts down, the

input voltage must be set to zero, then the input power supply has to be turned off, then turned on

and V

re-established.

Shut down Procedure:

(1) Shut down the Load.

(2) Reduce the input voltage to zero and then shut down the input power supply.

(3) Reduce the controller and driver voltages to zero and then shut down the driver power supply.

Test Procedure

(1) Before making any connections, make sure to set the power supplies for input voltage, controller and

the driver voltage at 0V. Also make sure that the load current is at 0A.

(2) Connect the Oscilloscope probes at the desired test points.

(3) Set the controller voltage to 5V.

(4) Set the driver voltage to the required value (For example, V

drvr

= 5V).

(5) After reaching the required driver voltage, set the input voltage as required. (For example, V

= 12V).

(6) Set the load current slowly to the desired value. For example, I

out

= 2.5A. (Refer to

Start Up

Procedure #5).

(7) The frequency is already set to 330 kHz. If a different switching frequency is required, R13 and R14

have to be changed as per the data sheet of NCP5386. (Refer to

Appendix).

(8) Connect the voltmeters/multi-meters to monitor the required parameters. (Refer to

Figure 3).

(9) Obtain the required data and waveforms.

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