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UCC3830DAC-4 Datasheet(PDF) 8 Page - Texas Instruments

Part # UCC3830DAC-4
Description  5-Bit Microprocessor Power Supply Controller
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

UCC3830DAC-4 Datasheet(HTML) 8 Page - Texas Instruments

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8
UCC3830-4/-5/-6
Choosing the Input Capacitor
The input capacitors are chosen primarily based on their
switching frequency RMS current handling capability and
their voltage rating.
The input capacitors must handle
virtually all of the RMS current at the switching fre-
quency, even if the circuit does not have an input induc-
tor.
The switching current in the input capacitors
appears as shown in Figure 5.
The amount of RMS current in an Aluminum Electrolytic
capacitor has a strong impact on the reliability and life-
time of the capacitor.
Other factors which affect the life
of an input capacitor are internal heat rise, external air-
flow, the amount of time that the circuit operates at maxi-
mum current and the operating voltage.
The curves in
Figure 6 show the RMS current handled by the total input
capacitance in typical VRM circuits delivering 1.8V to
2.8V and powered from 5V.
Related Publications
U-156 and U-157 are Unitrode Application Notes describ-
ing the operation of the UC3886 and the UC3886/
UC3910 together in a Pentium® Pro application.
Typical Application
The UCC3830-x is ideal for converting the 5.0V system
bus into the required Pentium® Pro bus voltage. The
3.3V system bus can also be converted using the
UCC3830-x when the Pentium® Pro requires lower bus
voltages.
APPLICATION INFORMATION (cont.)
Table I. Parts list.
REFERENCE
DESIGNATOR
DESCRIPTION
PACKAGE
U1
Unitrode UCC3830DWP-5 DAC/PWM
SOIC-20 Wide
C1
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C2
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C3
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C4
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C5
Sprague/Vishay 595D475X0016A2B, 4.7
µF 16V Tantalum
SPRAGUE Size A
C6
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C7
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C8
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C9
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C10
Sanyo 6MV1500GX, 1500
µF, 6.3V, Aluminum Electrolytic
10x20mm Radial Can
C11
Sprague 593D107X9010D2, 100
µF, 6.3V Tantalum
EIA Size D SMD
C12
0.10
µF Ceramic
1206 SMD
C13
0.01
µF Ceramic
0603 SMD
C14
0.01
µF Ceramic
0603 SMD
C15
0.01
µF Ceramic
0603 SMD
C16
1000pF Ceramic
0603 SMD
C17
0.10
µF Ceramic
1206 SMD
C18
33pF NPO Ceramic
0603 SMD
C19
1500pF Ceramic
0603 SMD
C20
82pF NPO Ceramic
0603 SMD
C21
0.10
µF Ceramic
1206 SMD
C22
0.10
µF Ceramic
1206 SMD
CR1
International Rectifier 32CTQ030 30V, 30A Schottky Diode
TO-220AB
L1
Micrometals T50-52B, 10 Turns #16AWG, 4.5
µH
Toroid


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