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UQQ Series
Wide Input Range Single Output DC-DC Converters
Input Reverse-Polarity Protection
If the input-voltage polarity is accidentally reversed, an internal diode will
become forward biased and likely draw excessive current from the power
source. If the source is not current limited or the circuit appropriately fused, it
+VIN
+VOUT
+SENSE
could cause permanent damage to the converter.
Input Fusing
ON/OFF
CONTROL
TRIM
R TRIM UP
LOAD
Certain applications and/or safety agencies may require the installation of
–SENSE
fuses at the inputs of power conversion components. Fuses should also be
used if the possibility of a sustained, non-current-limited, input-voltage polarity
–VIN
–VOUT
reversal exists. For MPS UQQ Series DC-DC Converters, fast-blow fuses are
recommended with values no greater than twice the maximum input current.
Trimming Output Voltage
Figure 5. Trim Connections To Increase Output Voltages Using Fixed Resistors
UQQ converters have a trim capability (pin 6) that enables users to adjust the
output voltage from +10% to –20% (refer to the trim equations). Adjustments
to the output voltage can be accomplished with a single ?xed resistor as shown
in Figures 5 and 6. A single ?xed resistor can increase or decrease the output
+VIN
+VOUT
+SENSE
voltage depending on its connection. Resistors should be located close to
the converter and have TCR’s less than 100ppm/°C to minimize sensitivity to
ON/OFF
CONTROL
TRIM
R TRIM DOWN
LOAD
changes in temperature. If the trim function is not used, leave the trim pin open.
–SENSE
Standard UQQ’s have a "positive trim" where a single resistor connected from
the Trim pin (pin 6) to the +Sense (pin 7) will increase the output voltage. A
–VIN
–VOUT
resistor connected from the Trim Pin (pin 6) to the –Sense (pin 5) will decrease
the output voltage.
Figure 6. Trim Connections To Decrease Output Voltages Using Fixed Resistors
Trim adjustments greater than the speci?ed +10%/–20% can have an adverse
affect on the converter’s performance and are not recommended. Excessive
voltage differences between V OUT and Sense, in conjunction with trim adjust-
ment of the output voltage, can cause the overvoltage protection circuitry to
Trim Up
Trim Down
UQQ-3.3/25-Q12, UQQ-3.3/25-Q48
activate (see Performance Speci?cations for overvoltage limits).
Temperature/power derating is based on maximum output current and voltage
R T UP (k ) =
13.3(V O – 1.226)
V O – 3.3
– 10.2
R T DOWN (k ) =
16.31
3.3 – V O
– 10.2
at the converter’s output pins. Use of the trim and sense functions can cause
output voltages to increase, thereby increasing output power beyond the UQQ’s
UQQ-5/17-Q12, UQQ-5/20-Q48
speci?ed rating, or cause output voltages to climb into the output overvoltage
region. Therefore:
R T UP (k ) =
20.4(V O – 1.226)
V O – 5
– 10.2
R T DOWN (k ) =
25.01
5 – V O
– 10.2
(V OUT at pins) x (I OUT ) ? rated output power
The Trim pin (pin 6) is a relatively high impedance node that can be susceptible
UQQ-12/8-Q12, UQQ-12/8-Q48
to noise pickup when connected to long conductors in noisy environments.
R T UP (k ) =
49.6(V O – 1.226)
V O – 12
– 10.2
R T DOWN (k ) =
60.45
12 – V O
– 10.2
UQQ-15/7-Q12
R T UP (k ) =
62.9(V O – 1.226)
V O – 15
– 10.2
R T DOWN (k ) =
76.56
15 – V O
– 10.2
UQQ-24/4-Q12
R T UP (k ) =
101 × (V O – 1.226)
V O – 24
– 10.2
R T DOWN (k ) =
124.2
24 – V O
– 10.2
www.murata-ps.com/support
MDC_UQQ.D03 Page 15 of 18
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相关代理商/技术参数
UQQ-5/17-Q12PB-C
制造商:Murata Power Solutions 功能描述:DC/DC Converter
UQQ-5/17-Q12P-C
功能描述:DC/DC转换器 12Vin 5Vout 17A pos polarity TH 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:
UQQ-5/20-Q48NB-C
功能描述:DC/DC转换器 48Vin 5Vout 20A neg TH baseplate 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:
UQQ-5/20-Q48N-C
功能描述:DC/DC转换器 48Vin 5Vout 20A neg polarity TH
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:
UQQ-5/20-Q48PB-C
功能描述:DC/DC转换器 48Vin 5Vout 20A pos TH baseplate 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:
UQQ-5/20-Q48P-C
功能描述:DC/DC转换器 48Vin 5Vout 20A pos polarity TH 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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制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Wide Input Range Single Output DC/DC Converters
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