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參數(shù)資料
| 型號(hào)： | PMR8210P/C |
| 廠商： | ERICSSON POWER MODULES AB |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封裝： | 38.61 X 25.91 MM, 9.64 MM HEIGHT, ROHS COMPLIANT, PACKAGE-22 |
| 文件頁數(shù)： | 4/21頁 |
| 文件大?。?/td> | 1207K |
| 代理商： | PMR8210P/C |
Ericsson Internal
PRODUCT SPECIFICATION
4 (9)
Prepared (also subject responsible if other)
No.
ECOCOLO
3/1301-BMR 629 8210 Uen
Approved
Checked
Date
Rev
Reference
SEC/D (Julia You)
EJANLLI
2009-09-28
C
Over Current Protection (OCP)
The regulators include current limiting circuitry for protection at
continuous overload. The output voltage will decrease towards
zero for output currents in excess of max output current (max
IO). 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.
Soft-start Power Up
From the moment a valid input voltage is applied, the soft-start
control introduces a short time-delay (typically 5-15 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.
Auto-Track Function
Auto-Track was designed to simplify the amount of circuitry
required to make the output voltage from each unit power up
and power down in sequence. The sequencing of two or more
supply voltages during power up is a common requirement for
complex mixed-signal applications, that use dual-voltage VLSI
Ics such as DSPs, micro-processors and ASICs.
Notes on Use of Auto-Track
1. The Track pin voltage must be allowed to rise above the
module set-point voltage before the module regulates at its
adjusted set-point voltage.
2. The Auto-Track function tracks almost any voltage ramp
during power up, and is compatible with ramp speeds of up to
1 V/ms.
3. The absolute maximum voltage that may be applied to the
Track pin is the input voltage VI.
4. The module cannot follow a voltage at its track control
input until it has completed its soft-start initialization.
This takes about 20 ms from the time that a valid voltage has
been applied to its input. During this period, it is
recommended that the Track pin be held at ground potential.
5. The Auto-Track function is disabled by connecting the
Track pin to the input voltage (VI). When Auto-Track is
disabled, the output voltage rises according to its softstart
rate after input power has been applied.
6. The Auto-Track pin should never be used to regulate the
module’s output voltage for long-term, steady-state
operation.
Smart Sync
Smart Sync is a feature that allows multiple power modules to
be synchronized to a common frequency. When not used, this
pin must be connect to GND. Driving the Smart Sync pins with
an external oscillator set to the desired frequency,
synchronizes all connected modules to the selected requency.
The synchronization frequency can be higher or lower than the
nominal switching frequency of the modules within the range
of 240 kHz to 400 kHz.
Synchronizing modules powered from the same bus
eliminates beat frequencies reflected back to the input supply,
and also reduces EMI filtering requirements. Eliminating the
low beat frequencies (usually<10kHz) allows the EMI filter to
be designed to attenuate only the synchronization frequency.
Power modules can also be synchronized out of phase to
minimize ripple current and reduce input capacitance
requirements.
The PMR 8210 requires that the external synchronization
frequency be present before a valid input voltage is present or
before release of the inhibit control.
Pre-Bias Startup Capability
A prebias startup condition occurs as a result of an external
voltage being present at the output of a power module prior to
its output becoming active.This often occurs in complex digital
systems when current from another power source is backfed
through a dual-supply logic component, such as FPGA or
ASIC.
The PMR family of regulators incorporate synchronous
rectifiers, but will not sink current during startup, or whenever
the Inhibit pin is held low. However, to ensure satisfactory
operation of this function, certain conditions must be
maintained.
For more inforamtion, please refer to Application Note 205.
Turbo Trans
TM Technology
Turbo Trans
TM optimizes the transient response of the
regulator with added external capacitance using a single
external resistor. The benefits of this technology include:
reduced output capacitance, minimized output voltage
deviation following a load transient, and enhanced stability
when using ultra-low ESR output capacitors. The amout of
output capacitance required to meet a target output voltage
deviation, is reduded with Turbo Trans
TM activated. Likewise,
for a given amout of output capacitance, with Turbo Trans
TM
engaged, the amplitude of the voltage deviation following a
load transient is reduced. Applications requiring tight transient
voltage tolerances and minimized capacitor footprint area
benefit from this technology.
Utilizing Turbo Trans
TM requires connecting a resistor, RTT ,
between the +Sense pin (pin 17) and the Turbo Trans
TM pin
(pin 19), The value of the resistor directly corresponds to the
amount of output capacitance required. For the PMR 8210,
the minimum required capacitance is 1000F. When using
Turbo Trans
TM, capacitors with a capacitance×ESR product
below 10,000 F×m are required.
To have a better understanding of the required capacitors with
Turbo Trans
TM, three types of capacitors are defined as below.
a.
1,000)
ESR
e
capacitanc
(100
TypeA
≤
×
<
=
b.
000)
5
ESR
e
capacitanc
000
(1
TypeB
，
≤
×
<
=
c.
10,000)
ESR
e
capacitanc
(5,000
TypeC
≤
×
<
=
As an example, let’s look at a 12-V application requiring a 80
mv deviation during an 20A load transient. A majority of
560F, 10m output capacitors are used. Use the 12 V, Type
E
PMR 8000 series
PoL Regulator
Input 8 - 14 V, Output up to 40 A / 210 W
EN/LZT 146 411 R1B November 2009
Ericsson AB
Technical Specication
12
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