參數(shù)資料
型號(hào)： SQ48S15010PS00
廠商： POWER-ONE INC
元件分類： 電源模塊
英文描述： 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
文件頁(yè)數(shù)： 45/75頁(yè)
文件大?。?/td> 1113K
代理商： SQ48S15010PS00
SQ48 Series
Data Sheet
SQ48 Family DS Ver 3 06-04-04
USA Toll Free 866 WOW-didt
Page 5 of 75
Trimming/sensing beyond 110% of the rated output voltage
is not an acceptable design practice, as this condition could
cause unwanted triggering of the output over-voltage protec-
tion (OVP) circuit. The designer should ensure that the dif-
ference between the voltages across the converter’s output
pins and its sense pins does not exceed 10% of VOUT(NOM),
or:
X
NOM
-
O
SENSE
OUT
10%
V
)]
(
V
)
(
[V
)]
(
V
)
(
[V
≤
+
+
[V]
This equation is applicable for any condition of output sens-
ing and/or output trim.
Protection Features
Input Under-Voltage Lockout
Input under-voltage lockout is standard with this converter.
The converter will shut down when the input voltage drops
below a pre-determined voltage.
The input voltage must be at typically 34V for the converter
to turn on. Once the converter has been turned on, it will
shut off when the input voltage drops typically below 32V.
This feature is beneficial in preventing deep discharging of
batteries used in telecom applications.
Output Over-Current Protection (OCP)
The converter is protected against over-current or short cir-
cuit conditions. Upon sensing an over-current condition, the
converter will switch to constant current operation and
thereby begin to reduce output voltage. When the output
voltage drops below 50% of the nominal value of output volt-
age, the converter will shut down (Fig. x.17).
Once the converter has shut down, it will attempt to restart
nominally every 100 ms with a typical 1-2% duty cycle (Fig.
x.18). The attempted restart will continue indefinitely until the
overload or short circuit conditions are removed or the output
voltage rises above 50% of its nominal value.
Output Over-Voltage Protection (OVP)
The converter will shut down if the output voltage across
Vout(+) (Pin 8) and Vout(-) (Pin 4) exceeds the threshold of
the OVP circuitry. The OVP circuitry contains its own refer-
ence, independent of the output voltage regulation loop.
Once the converter has shut down, it will attempt to restart
every 100 ms until the OVP condition is removed.
Over-Temperature Protection (OTP)
The converter will shut down under an over-temperature
condition to protect itself from overheating caused by opera-
tion outside the thermal derating curves, or operation in ab-
normal conditions such as system fan failure. After the con-
verter has cooled to a safe operating temperature, it will
automatically restart.
Safety Requirements
The converters meet North American and International
safety regulatory requirements per UL60950 and EN60950.
Basic Insulation is provided between input and output.
To comply with safety agencies requirements, an input line
fuse must be used external to the converter. The Table be-
low provides the recommended fuse rating for use with this
family of products.
Output Voltage
Fuse Rating
3.3 V
4-A
12 - 5.0 V, 2.5 V
3-A
2.0 - 1.0 V
2-A
If one input fuse is used for a group of modules, the maxi-
mum fuse rating should not exceed 15-A (SQ modules are
UL approved with up to a 15-A fuse).
Electromagnetic Compatibility (EMC)
EMC requirements must be met at the end-product system
level, as no specific standards dedicated to EMC character-
istics of board mounted component dc-dc converters exist.
However, di/dt tests its converters to several system level
standards, primary of which is the more stringent EN55022,
Information technology equipment - Radio disturbance char-
acteristics - Limits and methods of measurement.
With the addition of a simple external filter (see Application
Note 100), all versions of the SQ Series of converters pass
the requirements of Class B conducted emissions per
EN55022 and FCC, and meet at a minimum, Class A radi-
ated emissions per EN 55022 and Class B per FCC Title
47CFR, Part 15-J. Please contact di/dt Applications Engi-
neering for details of this testing.
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