參數(shù)資料
型號： PMM8218TSR
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-20
文件頁數(shù)： 20/34頁
文件大?。?/td> 1801K
代理商： PMM8218TSR
Ericsson Internal
PRODUCT SPEC.
2 (5)
Prepared (also subject responsible if other)
No.
SEC/D KEVIN YAN
3/1301-BMR 651 8 Uen
Approved
Checked
Date
Rev
Reference
SEC/D Wei Zhang A
2006-3-6
PA1
External Capacitors
Input capacitors:
The recommended input capacitors are determined by the
560 F minimum capacitance and 300 mArms minimum
ripple current rating. For high performance applications, or
wherever the transient capability of the input source is limited,
1000 F of input capacitance is recommended.
Output capacitors (optional):
The recommended output capacitance of 660 F will allow
the module to meet its transient response specification as
defined in the electrical specification.
When using one or more non-ceramic capacitors, the
calculated equivalent ESR should be no lower than 4 m
(7m using the manufacturer’s maximum ESR for a single
capacitor).
Input And Output Impedance
The impedance of both the input source and the load will
interact with the impedance of the POL regulator. It is
important that the input source has low characteristic
impedance. The regulators are designed for stable operation
without external capacitors connected to the input or output.
The performance in some applications can be enhanced by
addition of external capacitance as described under External
Decoupling Capacitors. If the input voltage source contains
significant inductance, the addition of a 100 F capacitor
across the input of the regulator will ensure stable operation.
The capacitor is not required when powering the POL
regulator from an input source with an inductance below
10 H.
External Decoupling Capacitors
When powering loads with significant dynamic current
requirements, the voltage regulation at the point of load can
be improved by addition of decoupling capacitors at the load.
The most effective technique is to locate low ESR ceramic
and electrolytic capacitors as close to the load as possible,
using several parallel capacitors to lower the effective ESR.
The ceramic capacitors will handle high-frequency dynamic
load changes while the electrolytic capacitors are used to
handle low frequency dynamic load changes. Ceramic
capacitors will also reduce any high frequency noise at the
load.
It is equally important to use low resistance and low
inductance PCB layouts and cabling.
External decoupling capacitors will become part of the
control loop of the POL regulator and may affect the stability
margins. As a “rule of thumb”, 100 F/A of output current can
be added without any additional analysis. The ESR of the
capacitors is a very important parameter. Power Modules
guarantee stable operation with a verified ESR value of >10
m across the output connections.
For further information please contact your local Ericsson
Power Modules representative.
Output Voltage Adjust (Vadj)
The output voltage can be set by means of an external
resistor, connected to the Vadj pin. Nominal output voltage 0.8
V is set by leaving the Vadj pin open. Adjustment can only be
made to increase the output voltage setting.
To increase the voltage a resistor should be connected
between the Vadj pin and GND pin. The resistor value of the
Output voltage adjust function is according to information
given under the Output section for the respective product.
UVLO Adjustment
The UVLO feature of the PMM family module allows for
limited adjustment of both the on threshold and hysterisis
voltages. The adjustment is made via the UVLO Prog control
pin. When the UVLO Prog pin is left open circuit, the on
threshold and hysterisis voltages are internally set to their
default values. The on threshold has a nominal voltage of 7.5
V, and the hysterisis 1 V. This ensures that the module
produces a regulated output when the minimum input voltage
is applied. The combination correlates to an off threshold of
approximately 6.5 V. The adjustments are limited. The on
threshold can only be adjusted higher, and the hysterisis
voltage can only be reduced in magnitude.
Parallel Operation
Two POL regulators may be paralleled for redundancy if the
total power is equal or less than PO max. It is not
recommended to parallel the POL regulators without using
external current sharing circuits.
Remote Sense
The POL regulators have remote sense that can be used to
compensate for voltage drops between the output and the
point of load. The sense traces should be located close to the
PCB ground layer to reduce noise susceptibility. The remote
sense circuitry will compensate for up to 0.3v voltage drop
between output pins and the point of load.
If the remote sense is not needed +Sense and —Sense should
be left open.
E
PMM 8000 series
POL regulator, Input 8-14 V, Output 50 A/275 W
EN/LZT 146 339 R1A April 2006
Ericsson Power Modules AB
Technical Specication
E
PMM 8000 series
POL regulator, Input 8-14 V, Output 50 A/275 W
EN/LZT 146 339 R1A April 2006
Ericsson Power Modules AB
Technical Specication
E
PMM 8000 series
POL regulator, Input 8-14 V, Output 50 A/275 W
EN/LZT 146 339 R1A April 2006
Ericsson Power Modules AB
Technical Specication
27
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