- 您现在的位置：买卖IC网 > Sheet目录871 > OKL-T/3-W5N-C (Murata Power Solutions Inc)CONV DC/DC 9.9W 3A 5VIN SMD
OKL-T/3-W5 Series
Programmable Output 3-Amp i LGA SMT PoLs
Output Current Limiting
Current limiting inception is de?ned as the point at which full power falls
below the rated tolerance. See the Performance/Functional Speci?ca-
tions. Note particularly that the output current may brie?y rise above its
rated value in normal operation as long as the average output power is
not exceeded. This enhances reliability and continued operation of your
application. If the output current is too high, the converter will enter the
short circuit condition.
Output Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop
as the output current demand increases. If the output voltage drops too
low (approximately 98% of nominal output voltage for most models), the
magnetically coupled voltage used to develop primary side voltages will
also drop, thereby shutting down the PWM controller. Following a time-out
period, the PWM will restart, causing the output voltage to begin ramping
up to its appropriate 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. A
short circuit can be tolerated inde?nitely.
Output Capacitive Load
These converters do not require external capacitance added to achieve
rated speci?cations. Users should only consider adding capacitance to
reduce 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 oscillation or instability.
The “hiccup” system differs from older latching short circuit systems
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
condition is removed.
Remote On/Off Control
The OKL Series power modules can be speci?ed with either a positive or nega-
tive 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
+Vin
R1
470K
OKL -T
+
OUT
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
SEQ
Control Voltage
SEQ
10K
–
will turn the unit 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 transistor 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
GND
Figure 6. Sequencing Signal Interface of Module
OKL N Module
within a low voltage (see speci?cations) with respect to –Vin. The unit is off
when 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
+Vin
Rp
+Vin
On/Off
Q3
E
PWM
GND
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
Q1
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.
GND
GND
BOM ? Rp ? 20K
BOM ? Q1 ? Q SMT MOS P 30V
Figure 7. On/Off Circuit Control for Using Negative On/Off Logic
www.murata-ps.com/support
MDC_OKL-T/3-W5 Series.B01 Page 15 of 17
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
OKL-T/6-W12N-C
CONV DC/DC 30W 6A 12VIN SMD
OKL-T/6-W5N-C
CONV DC/DC 19.8W 6A 5VIN SMD
OKR-T/10-W12-C
CONV DC/DC 10A 12VIN POL SIP
OKR-T/3-W12-C
CONV DC/DC 15W 12VIN SIP
OKR-T/6-W12-C
CONV DC/DC 6A 12VIN POL SIP
OKX-T/3-D12N-C
DC-DC CONVRT 0.7525-5.5V 3A 5SIP
OKX-T/3-W5P-C
DC-DC CONVRT 0.7525-3.6V 3A 5SIP
OKX-T/5-D12P-C
DC-DC CONVRT 0.7525-5.5V 5A 5SIP
相关代理商/技术参数
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
OKL-T/6-W5N-C
功能描述:DC/DC转换器 5Vin 0.6-3.3Vout 6A 19.8W 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-W5P-C
功能描述:DC/DC转换器 5Vin 0.6-3.3Vout 6A 19.8W 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-T1-W12
制造商:MURATA-PS 制造商全称:Murata Power Solutions Inc. 功能描述:Programmable Output 1-Amp iLGA SMT PoLs