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参数资料
| 型号： | QME48T20120-NGA0 |
| 厂商： | Power-One |
| 文件页数： | 5/14页 |
| 文件大小： | 0K |
| 描述： | DC/DC QUARTER BRICK 12V OUT |
| 标准包装： | 10 |
| 系列： | * |
QME48T20120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 20 A Output
Data Sheet
by the same percentage to ensure the converter’s
actual output power remains at or below the
maximum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
The output voltage can be adjusted up 10% or down
20% relative to the rated output voltage by the
addition of an externally connected resistor. Trim up
to 10% at full load is guaranteed at Vin ≥ 40V.
where,
R T ? DECR ? Required value of trim-down resistor [k ? ]
and Δ is defined above.
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard quarter-
bricks.
The TRIM pin should be left open if trimming is not
being used. To minimize noise pickup, a 0.1 μF
capacitor is connected internally between the TRIM
and SENSE(-) pins.
To increase the output voltage, refer to Fig. C. A trim
Vin
Vin (+)
ON/OFF
QME Series
Converter
(Top View)
Vout (+)
SENSE (+)
TRIM
SENSE (-)
R T-DECR
Rload
resistor, R T-INCR , should be connected between the
TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of:
Vin (-)
Vout (-)
R T ? INCR ?
5.11(100 ? Δ )V O ? NOM ? 626
1.225 Δ
? 10.22
[k ? ]
Fig. D: Configuration for decreasing output voltage .
Trimming/sensing beyond 110% of the rated output
where,
R T ? INCR ? Required value of trim-up resistor [k ? ]
V O ? NOM ? Nominal value of output voltage [V]
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converter’s output pins and
Δ ?
(V O -REQ ? V O -NOM )
V O - NOM
X 100
[%]
its sense pins does not exceed 10% of V OUT ( NOM ),
or:
[V OUT ( ? ) ? V OUT ( ? )] ? [V SENSE ( ? ) ? V SENSE ( ? )] ? V O - NOM X 10% [V]
V O ? REQ ? Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed
the converter‘s maximum allowable output power.
See the previous section for a complete discussion
of this requirement.
This equation is applicable for any condition of
output sensing and/or output trim.
Vin (+)
QME Series
Converter
Vout (+)
(Top View)
SENSE (+)
R T-INCR
Vin
ON/OFF
TRIM
Rload
SENSE (-)
Vin (-)
Vout (-)
Fig. C: Configuration for increasing output voltage.
To decrease the output voltage (Fig. D), a trim
resistor, R T-DECR , should be connected between the
TRIM (Pin 6) and SENSE(-) (Pin 5), with a value of:
R T ? DECR ?
511
| Δ |
? 10.22
[k ? ]
ZD-01742 Rev 3.4, 21-Jan-10
www.power-one.com
Page 5 of 14
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| QME48T20120-NGB0 | 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: |
| QME48T20120-NGB0G | 功能描述:DC/DC转换器 36-75VIN 12V @ 20A 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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| QME48T20120-PGB0G | 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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