參數(shù)資料
型號(hào)： PMC8518TS
廠商： ERICSSON POWER MODULES AB
元件分類： 電源模塊
英文描述： 1-OUTPUT 50 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT PACKAGE-6
文件頁(yè)數(shù)： 20/34頁(yè)
文件大小： 951K
代理商： PMC8518TS
Ericsson Internal
PRODUCT SPECIFICATION
2 (6)
Prepared (also subject responsible if other)
No.
ESKEVIN
3/1301-BMR 619 8518 Uen
Approved
Checked
Date
Rev
Reference
SEC/D (Julia You)
ECHWANG
2007-8-16
A
Standard Version with “negative logic”
The RC pin may be used to turn on or turn off the regulator
using a suitable open collector function.
Turn off is achieved by connecting the RC pin to the input
voltage. The regulator will run in normal operation when the
RC pin is left open.
RC
Regulator
condition
Min
Typ
Max
Unit
High level
OFF
1.7
16
V
Open
ON
V
External Capacitors
Required Input Filter:
External input capacitors are required to increase the lifetime
of the internal capacitors. Low ESR ceramics should be used,
the minimum input capacitance is stated below.
PMC 8518T S 1 x 4.7 uF.
Optional Input Filter:
To minimize input ripple and to ensure even better stability
more capacitors can be added, see table below.
Consider the max output power in a given application and
choose sufficient capacitors to obtain desired ripple level.
Make sure that the extra capacitors are placed near the input
pins. The table below is just an example since the board
layout also has effect on the result.
Desired input ripple (mVp-p)
Output
power
150
250
500
0-20 W
2x4.7uF
------
20-40 W
5x4.7uF
2x4.7uF
------
40-50 W
8x4.7uF
4x4.7uF
2x4.7uF
Required output filter:
External output capacitance is also required to reduce the
output ripple and to obtain specified load step response. It is
recommended to use low ESR polymer capacitors or low ESR
ceramic capacitors.
Minimum requirement:
PMC 8518T S 2 x 150 uF. (low ESR polymer type).
This is the output filter used in the verification and a
requirement to meet the specification.
Input And Output Impedance
The impedance of both the power source and the load will
interact with the impedance of the DC/DC regulator. It is most
important to have low characteristic impedance, both at the
input and output, as the regulators have a low energy storage
capability. Use capacitors across the input if the source
inductance is greater than 4.7 uH. Suitable input capacitors
are 22 uF - 220 uF low ESR ceramics.
Maximum Capacitive Load
When powering loads with significant dynamic current
requirements, the voltage regulation at the load can be
improved by addition of decoupling capacitance at the load.
The most effective technique is to locate low ESR ceramic
capacitors as close to the load as possible, using several
capacitors to lower the total ESR. These ceramic capacitors
will handle short duration high-frequency components of
dynamic load changes. In addition, higher values of
capacitors (electrolytic capacitors) should be used to handle
the mid-frequency components. It is equally important to use
good design practice when configuring the DC distribution
system.
Low resistance and low inductance PCB layouts and cabling
should be used. Remember that when using remote sensing,
all resistance (including the ESR), inductance and
capacitance of the distribution system is within the feedback
loop of the regulator. This can affect on the regulators
compensation and the resulting stability and dynamic
response performance.
Very low ESR and high capacitance must be used with care.
A “rule of thumb” is that the total capacitance must never
exceed typically 500-700 uF if only low ESR (< 2 m) ceramic
capacitors are used. If more capacitance is needed, a
combination of low ESR type and electrolytic capacitors
should be used; otherwise the stability will be affected.
The PMC 8000 series regulator can accept up to 5 mF of
capacitive load on the output at full load. This gives <500
uF/A of Io. When using that large capacitance it is important
to consider the selection of output capacitors; the resulting
behaviour is a combination of the amount of capacitance and
ESR.
A combination of low ESR and output capacitance exceeding
E
PMC 8518 series
POL regulator, Input 12 V, Output 10 A/50 W
EN/LZT 146 063 R3A Aug 2007
Ericsson Power Modules AB
Technical Specication
27
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