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| 型号： | QM48T25050-NDA0 |
| 厂商： | Power-One |
| 文件页数： | 3/13页 |
| 文件大小： | 0K |
| 描述： | DC/DC QTR BRICK 125W 5V T/H |
| 标准包装： | 50 |
| 系列： | * |
QM48T/S25050 DC-DC Converter Data Sheet
36-75 VDC Input; 5 VDC @ 25 A Quarter-Brick
the Start-up
Information section for system timing
Operation
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.
However, 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
waveforms associated with use of the ON/OFF pin.
Remote Sense (Pins 5 and 7)
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).
QmaX
Series
addition of a 33 μF electrolytic capacitor with an ESR <
1 ? across the input helps ensure stability of the converter.
In many applications, the user has to use decoupling
Vin (+)
TM
Converter
(Top View)
Vout (+)
100
SENSE (+)
Rw
capacitance at the load. The power converter will exhibit
stable operation with external load capacitance up to
2,200 μF on 5 V output.
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
10
Vout (-)
Rw
Rload
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 logic and negative logic
and both are referenced to Vin(-). Typical connections are
shown in Fig. A.
Fig. B: Remote sense circuit configuration.
If remote sensing is not required, the SENSE(-) pin must
be connected to the Vout(-) pin (Pin 4), and the SENSE(+)
pin must be connected to the Vout(+) pin (Pin 8) to ensure
the converter will regulate at the specified output voltage. If
QmaX
Series
Vin (+)
TM
Converter
(Top View)
Vout (+)
SENSE (+)
these connections are not made, the converter will deliver
an output voltage that is slightly higher than the specified
value.
Vin
ON/OFF
TRIM
Rload
Because the sense leads carry minimal current, large
SENSE (-)
traces on the end-user board are not required. However,
CONTROL
INPUT
Vin (-)
Vout (-)
sense traces should be located close to a ground plane to
minimize system noise and ensure optimum performance.
When wiring discretely, twisted pair wires should be used
to connect the sense lines to the load to reduce
Fig. A: 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 .
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.
ON/OFF pin is internally pulled-up to 5 V through a
resistor. A 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 of
± 20 V max. may be connected directly to the ON/OFF
input, in which case it should be capable of sourcing or
sinking up to 1 mA depending on the signal polarity. See
susceptibility to noise.
The converter’s output overvoltage protection (OVP)
senses the voltage across Vout(+) and Vout(-), and not
across the sense lines, so the resistance (and resulting
voltage drop) between the output pins of the converter and
the load should be minimized to prevent unwanted
triggering of the OVP.
When utilizing the remote sense feature, care must be
taken not to exceed the maximum allowable output power
capability of the converter, equal to the product of the
nominal output voltage and the allowable output current for
the given conditions.
When using remote sense, the output voltage at the
converter can be increased by as much as 10% above the
nominal rating in order to maintain the required voltage
across the load. Therefore, the designer must, if
necessary, decrease the maximum current (originally
MAR 27, 2003 revised to SEP 28, 2006
Page 3 of 13
www.power-one.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| QM48T25050-NDA0G | 功能描述:DC/DC转换器 RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| QM48T25050-NDAP | 制造商:Power-One 功能描述:DC/DC PS SGL-OUT 5V 25A 8PIN QUARTER-BRICK - Bulk |
| QM48T25050-NDAPG | 制造商:Power-One 功能描述:DC/DC PS SGL-OUT 5V 25A - Bulk |
| QM48T25050-NDB0 | 功能描述:DC/DC转换器 RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| QM48T25050-NDB0G | 功能描述:DC/DC转换器 RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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