ADP3193AJCPZ-RL View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

ADP3193AJCPZ-RL

8-Bit, Programmable, 2-Phase to 3-Phase, Synchronous Buck Controller

Analog Devices 

The maximum power dissipated is calculated using Equation 40.

( ) PMAX =

VIN(MAX) − VCC(MIN )

RSHUNT

2

(40)

where:

VIN(MAX) is the maximum voltage from the 12 V input supply

(if the 12 V input supply is 12 V ± 5%, VIN(MAX) = 12.6 V;

if the 12 V input supply is 12 V ± 10%, VIN(MAX) = 13.2 V).

VCC(MIN) is the minimum VCC voltage of the ADP3193A. This is

specified as 4.75 V.

RSHUNT is the shunt resistor value.

The CECC standard specification for power rating in surface-

mount resistors is 0.1 W for 0603-size resistors, 0.125 W for 0805-

size resistors, and 0.25 W for 1206-size resistors.

TUNING PROCEDURE FOR ADP3193A

Set Up and Test the Circuit

1. Build a circuit based on the compensation values

computed from the design spreadsheet.

2. Connect a dc load to the circuit.

3. Turn on the ADP3193A and verify that it operates properly.

4. Check for jitter with no load and full load conditions.

Set the DC Load Line

1. Measure the output voltage with no load (VNL) and verify

that it is within the specified tolerance range.

ADP3193A

2. Measure the output voltage with a full load when the

device is cold (VFLCOLD). Allow the board to run for ~10

minutes at full load, and then measure the output when the

device is hot (VFLHOT). If the difference between the two

measured voltages is more than a few millivolts, adjust RCS1

and RCS2 using Equation 41 and Equation 43.

RCS2(NEW )

=

RCS2(OLD )

× VNL − VFLCOLD

VNL − VFLHOT

(41)

3. Repeat Step 2 until no adjustment of RCS1 and RCS2 is needed.

4. Compare the output voltage with no load to that with a full

load using 5 A steps. Compute the load line slope for each

change, and then calculate the average to determine the

overall load line slope (ROMEAS).

5. If the difference between ROMEAS and RO is more than 0.05 mΩ,

use Equation 42 to adjust the RPH values.

RPH (NEW )

=

RPH (OLD )

×

ROMEAS

RO

(42)

6. Repeat Step 6 and Step 7 until no adjustment of RPH is needed.

Once this is achieved, do not change RPH, RCS1, RCS2, or RTH

for the remainder of the procedure.

7. Measure the output ripple with no load and with a full load

with scope, making sure both are within specifications.

RCS1(NEW) =

1

RCS1(OLD) + RTH(25°C)

−1

RCS1(OLD) × RTH(25°C) + (RCS1(OLD) − RCS2(NEW) )× (RCS1(OLD) − RTH (25°C) ) RTH(25°C)

(43)

Rev. 0 | Page 27 of 32

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