OKL-T/6-W5 Series
Programmable Output 6-Amp iLGA SMT PoLs
Output Current Limiting
Voltage Range Graph
Current limiting inception is defined as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifica-
tions. Note particularly that the output current may briefly 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.
Please observe the limits below for voltage input and output ranges. These
limits apply at all output currents.
6
5
4
Vin=2.4V / Vout=1.8V
3
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 mag-
netically coupled voltage used to develop PWM bias voltage will also 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-
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.
2
1
0
Upper Limit
Lower Limit
0.5
1
1.5
2
2.5
3
3.5
Output Voltage (V)
Soldering Guidelines
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
specifications may cause damage to the product. Your production environment may differ
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.
therefore please thoroughly review these guidelines with your process engineers.
Reflow Solder Operations for surface-mount products (SMT)
For Sn/Ag/Cu based solders:
Remote On/Off Control
The remote On/Off Control can be specified with either positive or negative
logic polarity. Please refer to the Connection Diagram on page 1 for On/Off
connections.
Preheat Temperature
Time over Liquidus
Less than 1 ºC. per second
45 to 75 seconds
Maximum Peak Temperature
Cooling Rate
260 ºC.
Positive polarity models are enabled when the On/Off pin is left open or
is pulled high to +Vin with respect to –Vin. An internal bias current causes
the open pin to rise to +Vin. Positive-polarity devices are disabled when the
On/Off is grounded or brought to within a low voltage (see Specifications)
with respect to –Vin.
Less than 3 ºC. per second
For Sn/Pb based solders:
Preheat Temperature
Time over Liquidus
Less than 1 ºC. per second
60 to 75 seconds
Negative polarity devices are on (enabled) when the On/Off is open or
brought to within a low voltage (see Specifications) with respect to –Vin.
The device is off (disabled) when the On/Off is pulled high with respect to
–Vin (see specifications).
Maximum Peak Temperature
Cooling Rate
235 ºC.
Less than 3 ºC. per second
Recommended Lead-free Solder Reflow Profile
Dynamic control of the On/Off function should be able to sink the speci-
fied signal current when brought low and withstand appropriate voltage
when brought high. Be aware too that there is a finite time in milliseconds
(see Specifications) 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.
Peak Temp.
235-260° C
250
200
Reflow Zone
150
100
50
Soaking Zone
120 sec max
time above 217° C
45-75 sec
Output Capacitive Load
These converters do not require external capacitance added to achieve
rated specifications. 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.
<1.5° C/sec
Preheating Zone
240 sec max
0
0
30
60
90
120
150
Time (sec)
180
210
240
270
300
High trace = normal upper limit
Low trace - normal lower limit
www.murata-ps.com
email: sales@murata-ps.com
13 May 2010 MDC_OKL-T/6-W5 Series.A02 Page 7 of 15
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