10

UCC2882/-1

UCC3882/-1

Demonstration Kit Design and Performance

A demonstration circuit was built based on the UCC3882

and utilizing an Intel VRM 8.1 form factor connector. The

schematic is shown in Figure 9 and the Bill of Materials

in Table 3. The circuit is configured for the following oper-

ating parameters:

• Switching Frequency = 225kHz

• Rated Output Current = 15A

• Short Circuit Current = 17A Nominal

• Output Voltage: 1.8V to 2.8V Configured by VID Code

• Airflow: 100 LFM

• Temperature: 0 to 60°C

• Regulation: Per Intel VRM 8.1 DC-DC Converter

Design Guidelines

Figures 12 - 14 show the performance of the circuit.

APPLICATION INFORMATION (continued)

REF

DESCRIPTION

PACKAGE

U1

Unitrode UCC3882 DAC/PWM

SOIC-28 WIDE

C01

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C02

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C03

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C04

Sprague/Vishay 595D475X0016A2B, 4.7uF 16V Tantalum

SPRAGUE Size A

C05

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C06

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C07

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C08

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C09

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

C10

0.10

µF Ceramic

1206 SMD

C11

0.10

µF Ceramic

1206 SMD

C12

0.01

µF Ceramic

0603 SMD

C13

0.01

µF Ceramic

0603 SMD

C14

0.01

µF Ceramic

0603 SMD

C15

0.10

µF Ceramic

1206 SMD

C17

68pF NPO Ceramic

0603 SMD

C18

1000pF Ceramic

0603 SMD

C19

220pF NPO Ceramic

0603 SMD

C20

Sanyo 6MV1500GX, 1500

µF, 6.3V, Aluminum Electrolytic

10x20mm Radial Can

CT

3900pF Ceramic

0603 SMD

J1

AMP 532956-7 40 Pin Connector

40 Pin

L1

Toroid T51-52C, 5 Turns #16AWG, 1.6

µH

Toroid

Q1

International Rectifier IRL3103, 30V, 56A

TO-220AB, layed down

Q2

International Rectifier IRL3103D1, 30V, 56A

TO-220AB, layed down

R01

5m

Ω, PCB Resistor

Copper Trace

R02

10k

Ω, 5%, 1/16 Watt

0603 SMD

R03

5.62k

Ω, 1%, 1/16 Watt

0603 SMD

R05

365k

Ω, 1%, 1/16 Watt

0603 SMD

R06

100k

Ω, 5%, 1/16 Watt

0603 SMD

R07

5.6k

Ω, 5%, 1/16 Watt

0603 SMD

R08

10k

Ω, 5%, 1/16 Watt

0603 SMD

R09

3.3

Ω, 5%, 1/16 Watt

0603 SMD

R10

3.3

Ω, 5%, 1/16 Watt

0603 SMD

Table 3. Bill of materials.