OKL-T/1-W12P-C Murata Power Solutions Inc, OKL-T/1-W12P-C Datasheet - Page 17

• Manufacturer Part Number: OKL-T/1-W12P-C
• Description: DC-DC CONVERTER, 5.5V, 5W
• Manufacturer: Murata Power Solutions Inc

Specifications of OKL-T/1-W12P-C

• Dc / Dc Converter O/p Type: Programmable
• No. Of Outputs: 1
• Input Voltage: 2.9VDC To 14VDC
• Power Rating: 5W
• Output Voltage: 5.5V
• Output Current: 1A
• Approval Bodies: EN, IEC, UL
• Supply Voltage: 12V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Remote On/Off Control
The OKL Series power modules can be specifi ed with either a positive or nega-
tive logic polarity. 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 on when input voltage is present.
high to +Vin. The On/Off circuit control is shown in fi 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.
within a low voltage (see specifi cations) with respect to –Vin. The unit is off
when the ON/Off is pulled high with respect to –Vin (see specifi cations). The
On/Off circuitry is shown in fi 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.
fi ed signal current when brought low and withstand appropriate voltage
when brought high. Be aware too that there is a fi nite time in milliseconds
(see specifi 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.
Output Capacitive Load
These converters do not require external capacitance added to achieve
rated specifi 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.
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these
converters. These specifi cations vary depending on the solder type. Exceeding these
specifi cations may cause damage to the product. Your production environment may differ
therefore please thoroughly review these guidelines with your process engineers.
Recommended Lead-free Solder Refl ow Profi le
Positive—Units are enabled when the on/off pin is left open or is pulled
Negative—Units are enabled when the ON/Off is open or brought to
Dynamic control of the On/Off function should be able to sink the speci-
For Sn/Ag/Cu based solders:
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
Reflow Solder Operations for surface-mount products (SMT)
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
www.murata-ps.com
Recommended Lead-free Solder Refl ow Profi le
250
200
150
100
50
0
0
GND
+Vin
GND
+Vin
Rp
Q1
Rp
Q1
Figure 7. On/Off Circuit Control for Using Negative On/Off Logic
Programmable Output 1-Amp iLGA SMT PoLs
30
Figure 6. On/Off Circuit Control for Using Positive On/Off Logic
<1.5° C/sec
60
09 May 2011
GND
+Vin
On/Off
GND
+Vin
On/Off
90
OKL-T/1-W12 Series
Preheating Zone
OKL N Module
BOM
BOM
240 sec max
OKL P Module
BOM
BOM
Soaking Zone
120
120 sec max
Peak Temp.
235-260° C
Rp
Q1
Time (sec)
MDC_OKL-T/1-W12 Series.A04 Page 17 of 18
Rp
Q1
150
20K
Q SMT MOS P 30V
R1
20K
Q SMT MOS P 30V
180
time above 217° C
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Reflow Zone
45-75 sec
210
High trace = normal upper limit
Low trace = normal lower limit
Q3
E
240
E
270
PWM
300
PWM
GND