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参数资料
| 型号： | PML5518TP |
| 厂商： | ERICSSON POWER MODULES AB |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 59.4 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, MODULE-12 |
| 文件页数： | 5/18页 |
| 文件大小： | 458K |
| 代理商： | PML5518TP |
Ericsson Internal
PRODUCT SPEC.
2 (5)
Prepared (also subject responsible if other)
No.
SEC/D KEVIN YAN
3/1301-BMR 650 5 Uen
Approved
Checked
Date
Rev
Reference
SEC/D Julia You
ESECZHW
2006-8-17
A
External Capacitors
Input capacitors:
The recommended input capacitors are a 22 F ceramic and
a minimum of 680 F electrolytic type. For Vo >1 V and Io >
11 A, the 680 F capacitance must be rated for 750 mArms
ripple current capability. For all other conditions, the ripple
current rating must be at least 500 mArms.
Output capacitors (optional):
The recommended output capacitance of 100 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 POL 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 can be calculated according to
the following formula.
R
SET = 10 k × 0.8 V/( Vo- 0.8 V ) — 2.49 k
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.
Over Current Protection (OCP)
The POL regulators include current limiting circuitry for
protection at continuous overload.
The output voltage will decrease towards zero for output
currents in excess of the over-current threshold. The regulator
will resume normal operation after removal of the overload.
The load distribution should be designed for the maximum
output short circuit current specified. The current limit
operation is a “hick up” mode current limit.
Soft-start Power Up
From the moment a valid input voltage is applied, the soft-
start control introduces a short time-delay (typically 8 ms to
15 ms) before allowing the output voltage to rise.
The initial rise in input current when the input voltage first
starts to rise is the charge current drawn by the input
capacitors. Power-up is complete within 25 ms.
E
PML 5000 series
POL regulator, Input 5 V, Output 18 A/59.4 W
EN/LZT 146 365 R1A Aug 2006
Ericsson Power Modules AB
Technical Specication
E
PML 5000 series
POL regulator, Input 5 V, Output 18 A/59.4 W
EN/LZT 146 365 R1B Nov 2006
Ericsson Power Modules AB
Technical Specication
E
PML 5000 series
POL regulator, Input 5 V, Output 18 A/59.4 W
EN/LZT 146 365 R1C Dec 2006
Ericsson Power Modules AB
Technical Specication
E
PML 5000 series
POL regulator, Input 5 V, Output 18 A/59.4 W
EN/LZT 146 365 R1D Jan 2007
Ericsson Power Modules AB
Technical Specication
13
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