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參數(shù)資料
| 型號(hào)： | UCC2945 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 1V Synchronous Boost Converter |
| 中文描述： | 1V的同步升壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 190K |
| 代理商： | UCC2945 |
7
UCC2941-3/-5/-ADJ
UCC3941-3/-5/-ADJ
1.0V input.
Inductor Section
An inductor value of 22
μ
H will work well in most applica-
tions, but values between 10
μ
H and 100
μ
H are also ac-
ceptable. Lower value inductors typically offer lower ESR
and smaller physical size. Due to the nature of the
“bang-bang” controllers, larger inductor values will typi-
cally result in larger overall voltage ripple, because once
the output voltage level is satisfied the converter goes
discontinuous, resulting in the residual energy of inductor
causing overshoot.
It is recommended to keep the ESR of the inductor below
0.15
for 500mW applications. A Coilcraft DT3316P-223
surface mount inductor is one choice since it has a cur-
rent rating of 1.5A and an ESR of 84m
. Other choices
for surface mount inductors are shown in Table 1.
Output Capacitor Selection
Once the inductor value is selected the capacitor value
will determine the ripple of the converter. The worst case
peak to peak ripple of a cycle is determined by two com-
ponents, one is due to the charge storage characteristic,
and the other is the ESR of the capacitor. The worst case
ripple occurs when the inductor is operating at maximum
current and is expressed as follows:
(
C
)
(
V
)
V
I
L
V
I
C
CL
O
I
CL
ESR
=
+
2
2
where
I
CL
= the peak inductor current
I
Power Limit
V
IN
CL
=
V = output ripple
V
O
= output voltage
V
I
= input voltage
C
ESR
= ESR of the output capacitor
A Sanyo OS-CON series surface mount capacitor
(10SN100M) is one recommendation. This part has an
ESR rating of 90m
at 100
μ
F. Other potential capacitor
sources are shown in Table 2.
Input Capacitor Selection
Since the UCC3941 family does not require a large de-
coupling capacitor on the input voltage to operate prop-
erly, a 10
μ
F capacitor is sufficient for most applications.
Optimum efficiency will occur when the capacitor value is
large enough to decouple the source impedance. This
usually occurs for capacitor values in excess of 100
μ
F.
APPLICATION INFORMATION (cont.)
MANUFACTURER
Sanyo Video
Components
San Diego, California
Tel: 619-661-6322
Fax: 619-661-1055
AVX
Sanford, Maine
Tel: 207-282-5111
Fax: 207-283-1941
Sprague
Concord, New Hampshire
Tel: 603-224-1961
PART NUMBER
OS-CON Series
TPS Series
695D Series
Table 2. Capacitor Suppliers
MANUFACTURER
Coilcraft
Cary, Illinois
Tel: 708-639-2361
Fax: 708-639-1469
Coiltronics
Boca Raton, Florida
Tel: 407-241-7876
PART NUMBERS
DT Series
CTX Series
Table 1. Inductor Suppliers
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