參數(shù)資料
型號： AUM005A0D-SRZ
廠商： LINEAGE POWER LLC
元件分類： 電源模塊
英文描述： 1-OUTPUT 10 W DC-DC REG PWR SUPPLY MODULE
封裝： ROHS COMPLIANT, SMT-4
文件頁數(shù)： 8/26頁
文件大?。?/td> 1248K
代理商： AUM005A0D-SRZ
Lineage Power
1
6
Data Sheet
March 25, 2008
3.0 Vdc - 5.5 Vdc Input, 1.5 Vdc - 3.3 Vdc Output, 6 A
Austin Series SMT Non-Isolated dc-dc Power Modules:
Feature Descriptions
Output Regulation
These modules have intentional output resistance to facili-
tate improved transient response and paralleling. This
means that the output voltage will decrease with increasing
output current. For this reason, the total DC regulation win-
dow at a given operating and ambient temperature is com-
prised of a no load setpoint and a voltage drop due to
module output resistance.
Output Overcurrent Protection/Overtemperature
Protection
Current limiting is provided for momentary overloads and
short circuits. A sustained overload may cause the thermal
shutdown circuit to activate. The current limit inception is
nominally 7 amperes with the power semiconductors at
rated temperature in a 25 °C ambient environment. The ther-
mal circuitry will shut down the module at 110 °C minimum
on the power semiconductors’ top surfaces measured using
an infrared camera as described in the Thermal Ratings
Section.
Output Control
The control pin is a dual-function port that serves to enable/
disable the converter or provide a means of adjusting the
output voltage over a prescribed range. When the control pin
is grounded, the converter is disabled. With the pin left open,
the converter regulates to its specified output voltage. For
any other voltage applied to the pin, the output voltage fol-
lows this relationship:
The Thevenin equivalent input resistance of the control pin is
approximately 7.68K ohms and the open circuit
voltage is 1.5V.
The equation to margin low by connecting a resistor from the
control pin to ground is:
To margin low by 5%, RLOW = 146K.
The equation to margin high by connecting a resistor,
RHIGH, from the control pin to the input voltage, VIN is:
To maintain high of 5%, RHIGH = 351K for VIN = 5 volts and
RHIGH = 177K for VIN = 3.3 volts. Trim resistor tolerance
will obviously affect output voltage. To determine the magni-
tude of this effect, simply use the extreme values in the
above equations.
Because trimming affects the system reference, trimming
beyond +/- 10% is unacceptable and +/- approximately 5% is
desirable. One affect trimming has, aside from output volt-
age adjustment, is changing the current limit inception point.
Trimming the unit down beyond 5% requires derating avail-
able current by 1% for every percent beyond 5 that the mod-
ule is trimmed down. For example, if a module is trimmed
down 7%, then output current would have to be derated 2%.
If paralleled modules are to be trimmed using the control pin,
divide the calculated trim resistance for a single unit by the
number of modules paralleled. For example, if two paralleled
units are to be trimmed 5% low, then a resistance of 146K
divided by 2 should be used.
Parallel Operation
Up to five Austin Power Modules may be paralleled for extra
output current needs. For N units operating in parallel, the
output current rating will be equal to 6+(N-1)*4. For example,
three modules can deliver 14 amps. For parallel operation,
connect each control pin together. Care should be taken to
make each module see the same approximate trace resis-
tance to the load. In most cases, this requires that all con-
verters be close together. Thermal derating can be
approximated for parallel units by using the average current
plus 1 amp for an individual module. For example, if three
modules are carrying 12 amps, there is an average current
of 3 amps so the derating curve at 4 amps would be used.
Input and output decoupling should be scaled with the num-
ber of modules paralleled. If paralleled modules are to be
trimmed using the control pin, divide the calculated trim
resistance for a single unit by the number of modules paral-
leled. For example, if two paralleled units are to be trimmed
5% low, then a resistance of 146K divided by 2 should be
used.
OUTNOM
CONTROL
OUT
V
=
5
.
1
RLOW
7.68K
VOUT/VOUT nom
1 – VOUT/ VOUT nom
---------------------------------------------------------
=
RHIGH
7.68K
VOUT/VOUTnom – 1
------------------------------------------------------
=
VIN
1.5
---------- – 1 – 7.68
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