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UCC2837DTR Datasheet(PDF) 7 Page - Texas Instruments

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Part # UCC2837DTR
Description  8-Pin N-FET Linear Regulator Controller
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

UCC2837DTR Datasheet(HTML) 7 Page - Texas Instruments

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7
UCC1837
UCC2837
UCC3837
Practical Considerations
In order to achieve the expected performance, careful at-
tention must be paid to circuit layout. The printed circuit
board should be designed using a single point ground,
referenced to the return of the output capacitor.
All
traces carrying high current should be made as short and
wide as possible in order to minimize parasitic resistance
and inductance effects.
To illustrate the importance of these concepts, consider
the effects of a 1.5" PCB trace located between the out-
put capacitor and the UCC3837 feedback reference. A
0.07" wide trace of 1oz. copper results in an equivalent
resistance of 10.4m
Ω. At a load current of 3A, 31.2mV is
dropped across the trace, contributing almost 1% error to
the DC regulation. Likewise, the inductance of the trace
is approximately 3.24nH, resulting in a 91mV spike dur-
ing the 100ns it takes the load current to slew from
200mA to 3A.
The dropout voltage of a linear regulator is often a key
design parameter. Calculations of the dropout voltage of
a linear regulator based on the UCC3837 Controller
should consider all of the following:
• Sense resistor drop, including temperature and
tolerance effects,
• Path resistance drops on both the input and output
voltages,
• MOSFET resistance as a function of temperature and
gate drive, including transient performance,
• Ground path drops.
APPLICATION INFORMATION
15
16
17
18
19
20
21
0
20406080
AMBIENT TEMPERATURE [°C]
4
5
6
7
8
9
RESISTANCE
SHORT CIRCUIT LIMIT
Figure 6. Copper resistance and short circuit limit
for example resistor.
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460


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