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OKL-T/3-W12 Series
Programmable Output 3-Amp i LGA SMT PoLs
drop, thereby shutting down the PWM controller. Following a time-out period,
the PWM will restart, causing the output voltage to begin rising to its appropri-
OKL N Module
ate value. If the short-circuit condition persists, another shutdown cycle will
initiate. This rapid on/off cycling is called “hiccup mode”. The hiccup cycling
reduces the average output current, thereby preventing excessive internal
temperatures and/or component damage.
The “hiccup” system differs from older latching short circuit systems
+Vin
Rp
+Vin
On/Off
Q3
E
PWM
GND
because you do not have to power down the converter to make it restart. The
system will automatically restore operation as soon as the short circuit condi-
tion is removed.
Remote On/Off Control
Q1
The OKL Series power modules can be speci?ed with either a positive or negative
logic type. See Figures 7 and 8 for On/Off circuit control. In the positive logic on/off
option the unit turns on during a logic high on the On/Off pin and turns off during a
logic low. In a negative logic on/off option, the unit turns off during logic high and
on during logic low. The On/Off signal should always be reference to ground. For
positive or negative option, leaving then On/Off pin disconnected will turn the unit
GND
GND
BOM ? Rp ? 20K
BOM ? Q1 ? Q SMT MOS P 30V
Figure 8. On/Off Circuit Control for Using Negative On/Off Logic
on when input voltage is present.
Positive—Units are enabled when the on/off pin is left open or is pulled high
to +Vin. The On/Off circuit control is shown in ?gure 7. When the external tran-
sistor Q1 is in the off state, the internal PWM enable pin is pull high causing the
unit to turn on. When Q1 is turn on, the On/Off pin is pulled low and the units is
off. Rp should be around 20K ohms.
Negative—Units are enabled when the ON/Off is open or brought to within
a low voltage (see speci?cations) with respect to –Vin. The unit is off when
Soldering Guidelines
Murata Power Solutions recommends the speci?cations below when installing these
converters. These speci?cations vary depending on the solder type. Exceeding these
speci?cations may cause damage to the product. Your production environment may differ
therefore please thoroughly review these guidelines with your process engineers.
Reflow Solder Operations for surface-mount products (SMT)
For Sn/Ag/Cu based solders:
the ON/Off is pulled high with respect to –Vin (see speci?cations). The On/
Off circuitry is shown in ?gure 8. The On/Off pin should be pulled high with an
external pull-up resistor (20K ohms). When Q1 is in the off state, the On/Off pin
is pulled high, transistor Q3 is turn on and the unit is off. To turn on the unit,
Q1 is turn on, pulling the On/Off pin low and turning Q3 off resulting on the unit
being on.
Dynamic control of the On/Off function should be able to sink the speci-
?ed signal current when brought low and withstand appropriate voltage when
brought high. Be aware too that there is a ?nite time in milliseconds (see speci-
?cations) between the time of On/Off Control activation and stable, regulated
output. This time will vary slightly with output load type and current and input
conditions.
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
For Sn/Pb based solders:
Preheat Temperature
Time over Liquidus
Maximum Peak Temperature
Cooling Rate
Less than 1 oC. per second
45 to 75 seconds
260 oC.
Less than 3 oC. per second
Less than 1 oC. per second
60 to 75 seconds
235 oC.
Less than 3 oC. per second
Output Capacitive Load
These converters do not require external capacitance added to achieve
rated speci?cations. Users should only consider adding capacitance to reduce
250
200
Peak Temp.
235-260° C
switching noise and/or to handle spike current load steps. Install only enough
capacitance to achieve noise objectives. Excess external capacitance may
cause regulation problems, degraded transient response and possible oscilla-
tion or instability.
150
100
Soaking Zone
120 sec max
Re?ow Zone
time above 217° C
45-75 sec
50
<1.5° C/sec
Preheating Zone
High trace = normal upper limit
Low trace = normal lower limit
240 sec max
0
0
30
60
90
120
150
180
210
240
270
300
Time (sec)
Recommended Lead-free Solder Re?ow Pro?le
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MDC_OKL-T/3-W12 Series.B01 Page 16 of 17
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相关代理商/技术参数
OKL-T/3-W12P-C
制造商:Murata Power Solutions 功能描述:DC/DC Converter
OKL-T/3-W5
制造商:Murata Power Solutions 功能描述:- Rail/Tube
OKL-T/3-W5N-C
功能描述:DC/DC转换器 5Vin 0.6-3.63Vout 3A 9.9W Neg Polarity
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:
OKL-T/3-W5P-C
功能描述:DC/DC转换器 5Vin 0.6-3.63Vout 3A 9.9W Pos Polarity
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:
OKL-T/6-W12N-C
功能描述:DC/DC转换器 12Vin .59-5.5Vout 6A 30W Neg Polarity
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:
OKL-T/6-W12N-C
制造商:Murata Power Solutions 功能描述:DC/DC Converter
OKL-T/6-W12P-C
功能描述:DC/DC转换器 12Vin .59-5.5Vout 6A 30W Pos Polarity
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:
OKL-T/6-W5
制造商:MURATA 制造商全称:Murata Manufacturing Co., Ltd. 功能描述:Programmable Output 6-Amp iLGA SMT PoLs