
Ericsson Internal
PRODUCT SPEC. 2 (5)
Prepared (also subject responsible if other) No.
SEC/D KEVIN YAN 3/1301-BMR 651 4 Uen
Approved Checked Date Rev Reference
SEC/D Wei Zhang A 2006-3-16 PA1
External Ca
acito
s
Input capacitors:
The recommended input capacitors are determined by the
940 μF minimum capacitance and 400 mArms minimum
ripple current rating. For high performance applications, or
wherever the transient capabilit
of the input source is limited,
2200 μF of input capacitance is recommended.
Output capacitors (optional):
The recommended output capacitance of 660 μF 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 mΩ
(7mΩ 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 μF 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 μH.
External Decoupling Capacitors
When powering loads with significant dynamic current
requirements, the voltage regulation at the point of load can
be improved b
addition of decouplin
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
mar
ins. As a “rule of thumb”, 100 μF/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
mΩ 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 volta
e 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 2.63
V, and the hysteris is 0.62 V. This ensures that the module
produces a regulated output when the minimum input volta
e
is applied. The combination correlates to an off threshold of
approximately 2.0 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.
PMM 4000 series
POL regulator, Input 2.95-5.5 V, Output 60 A/150 W
EN/LZT 146 337 R1A April 2006
© Ericsson Power Modules AB
PMM 4000 series
POL regulator, Input 2.95-5.5 V, Output 60 A/150 W
EN/LZT 146 337 R1A April 2006
© Ericsson Power Modules AB
PMM 4000 series
POL regulator, Input 2.95-5.5 V, Output 60 A/150 W
EN/LZT 146 337 R1A April 2006
© Ericsson Power Modules AB
E
PMM 4000 series
POL regulator, Input 2.95-5.5 V, Output 60 A/150 W
EN/LZT 146 337 R1B March 2013
© Ericsson AB
Technical Specification