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參數(shù)資料
| 型號： | SQL48T20033-PDBB |
| 廠商： | POWER-ONE INC |
| 元件分類： | 電源模塊 |
| 英文描述： | DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ONE-EIGHTH BRICK PACKAGE-8 |
| 文件頁數(shù)： | 9/14頁 |
| 文件大小： | 773K |
| 代理商： | SQL48T20033-PDBB |
Rev 0.2, 3-Mar-11
www.power-one.com
Page 4 of 14
SQL48T20033 DC-DC Converter
36-75 VDC Input; 3.3 VDC @ 20A Output
Preliminary Data Sheet
Environment and Mechanical Specifications
Environmental
Operating Humidity
RH (Non-condensing)
95
%
Storage Humidity
RH (Non-condensing)
95
%
Mechanical
Weight
No Baseplate
21.4
g
With Baseplate
32.9
g
Reliability
MTBF
Telcordia SR-332, Method I Case 1
50% electrical stress, 40°C components
~23.6
MHrs
EMI and Regulatory Compliance
Conducted Emissions
CISPR 22 B with external EMI filter network
Safely Agency Approvals
UL60950-1/CSA60950-1, EN60950-1 and IEC60950-1
Operations
Input and Output Impedance
These power converters have been designed to be
stable with no external capacitors when used in low
inductance input and output circuits.
In many applications, the inductance associated with
the distribution from the power source to the input of
the converter can affect the stability of the converter.
The addition of a 33 μF electrolytic capacitor with an
ESR <1 Ω across the input helps to ensure stability
of the converter. In applications where decoupling
capacitance is distributed at the load, the power
converter will exhibit stable operation with up to the
maximum admissible external load capacitance up to
10,000 F
and ESR > 1mΩ.
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter
on or off remotely via a system signal. There are two
remote
control
options
available,
positive
and
negative logic, with both referenced to Vin(-). A
typical connection is shown in Fig. A.
Fig. A: Typ. Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF
pin is at logic high and turns off when at logic low. The
converter is on when the ON/OFF pin is left open. See
the
Electrical
Specifications
for
logic
high/low
definitions.
The negative logic version turns on when the pin is at
logic low and turns off when the pin is at logic high.
The ON/OFF pin can be hard wired directly to Vin(-) to
enable automatic power up of the converter without the
need of an external control signal.
The ON/OFF pin is internally pulled up to 5 VDC
through a resistor. A properly de-bounced mechanical
switch, open-collector transistor, or FET can be used
to drive the input of the ON/OFF pin. The device must
be capable of sinking up to 0.2 mA at a low level
voltage of
0.8 V. An external voltage source (±20 V
maximum) may be connected directly to the ON/OFF
input, in which case it must be capable of sourcing or
sinking up to 1 mA depending on the signal polarity.
See the Startup Information section for system timing
waveforms associated with use of the ON/OFF pin.
Remote Sense
The
remote
sense
feature
of
the
converter
compensates for voltage drops occurring between the
output pins of the converter and the load. The
SENSE(-) (Pin 5) and SENSE(+) ( Pin 7) pins should
be connected at the load or at the point where
regulation is required (see Fig. B). When using remote
sense a minimum of 100uF ceramic capacitance
should be mounted between Vout(+) and Vout(-) close
to the pin 8 and pin 4.
Rload
Vin
CONTROL
INPUT
Vin (+)
Vin (-)
ON/OFF
Vout (+)
Vout (-)
TRIM
SENSE (+)
SENSE (-)
(Top View)
SQL 48 Converter
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