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NPH25S Series
Isolated 25W Single Output DC/DC Converters
APPLICATION NOTES
OUTPUT VOLTAGE ADJUSTMENT
The trim resistor equations are:
Rup = (R/Vup) - S kΩ
Rdown = (L x T ) - T - S kΩ
V down
V NOM
S
T
R
L
3.4
22.2973
10.1351
17.9994
-1.6241
5.1
20.59761
9.36255
24.49487
-2.48374
12.1
28.79096
15.42373
94.9661
-5.942857
15.1
39.95902
20.77869
147.7314
-7.990244
TRIM UP
TRIM DOWN
+V IN
NPH25S
TRIM
R UP
+V OUT
+V IN
NPH25S
R DOWN
+V OUT
TRIM
- V OUT
When the output voltage is trimmed up, output current must be derated so that the maximum output power is not exceeded.
- V OUT
( )
Example to decrease output voltage of NPH25S4805EiC by 0.1V:
R DOWN = -2.48374 x 9.36255 - 9.36255 - 20.59761 = 203.18kΩ
-0.1
SET VOLTAGE
The output voltage of all units is set to 100mV above nominal, to offset resistive losses and thus assist with worst case error calculations. For the EiC versions, this
allowance can be altered with a single ?xed resistor, connected from the trimming pin to one of the output pins.
SHUTDOWN
When the shutdown pin (SS) is shorted to the negative input, the converter will
stop. Its current consumption will then be less than 1mA at nominal supply
voltage. The voltage must be less than 1.5V to ensure that the unit stops, and
must be able to sink at least 1mA.
The unit will restart if the control pin is left open circuit or raised to a value
close to its normal open circuit voltage. This is typically 10V. Note however,
that the unit will not meet speci?cation while a signi?cant current drain from
this pin remains.
If the shutdown pin is to be connected to a long wire, it is recommended that a
capacitor decouples the pin to the supply common in order to avoid the risk of
injecting noise into the converter circuit. A series resistor may also be helpful.
FREQUENCY CONTROL
If the primary side dc control voltage is pulled away from its open circuit
voltage, the converter frequency will be changed, approximately in proportion
to the voltage. With +8.5VDC voltage to SS pin, the typical switching frequency
will be 300kHz. If this is raised to 15VDC, the switching frequency will typically
be 510kHz. The frequency may thus be moved away from a sensitive value or
into a safe area. Deviation of at least –10% to +30% is achievable, though the
ef?ciency will decline with signi?cant changes. Also note that if the frequency
is lowered, the switching frequency component of output ripple will increase.
Since the design uses no large electrolytic capacitors, any use of a lower
frequency must allow for the effects of increased ripple. Additional external
?ltering may be required.
Values of 10nF and 1kΩ may be used.
Many NPH series converters may be switched together simply by linking the
primary control pins. The primary common pins must also be linked.
www.murata-ps.com/support
KDC_NPH25S.H01 Page 3 of 8
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相关代理商/技术参数
NPH25S4803EI 功能描述:DC/DC转换器 25W 48V TO 3.4V ADJ 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:
NPH25S4803EIC 功能描述:DC/DC转换器 48Vin 3.4Vout 7.3A Isolated 25W 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:
NPH25S4803I 功能描述:DC/DC转换器 25W 48VIN 3.4VOUT 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:
NPH25S4803IC 功能描述:DC/DC转换器 25W 48VIN 3.4VOUT Single Output 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:
NPH25S4805Ei 制造商:Murata Power Solutions 功能描述:DC/DC CONVERTER 25W 5V
NPH25S4805EIC 功能描述:DC/DC转换器 48Vin 5.1Vout 5A Isolated 25W 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:
NPH25S4805I 功能描述:DC/DC转换器 25W 48VIN 5.1VOUT 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:
NPH25S4805IC 功能描述:DC/DC转换器 25W 48VIN 5.1VOUT Single Output 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: