LSN2-T/22-D12-C Murata Power Solutions Inc, LSN2-T/22-D12-C Datasheet - Page 11

• Manufacturer Part Number: LSN2-T/22-D12-C
• Description: DC/DC Converters & Regulators 12Vin 0.8-5Vout 22A 112W NonIso DOSA-SIP
• Manufacturer: Murata Power Solutions Inc
• Series: LSN2r

Specifications of LSN2-T/22-D12-C

• Output Power: 110 W
• Input Voltage Range: 8.3 V to 14 V
• Input Voltage (nominal): 12 V
• Number Of Outputs: 1
• Output Voltage (channel 1): 0.8 V to 5 V
• Output Current (channel 1): 22 A
• Package / Case Size: SIP
• Output Type: Low Voltage Selectable
• Output Voltage: 0.8 V to 5 V
• Product: Non-Isolated / POL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LSN2-T/22-D12-C

[5] Be aware of the input characteristics of the Sequence pin. The high
[6] Allow the converter to eventually achieve its full-rated setpoint output
[7] The Sequence is a sensitive input into the feedback control loop of
[8] If one converter is slaving to another master converter, there will be a
[9] You may connect two or more Sequence inputs in parallel from two
[10] Any external capacitance added to the converter’s output may affect
input impedance affects the time constant of any small external ramp
capacitor. And the bias current will slowly charge up any external caps
over time if they are not grounded. The internal pull-up resistor to +V
typically 1M:.
Notice in the simplifi ed Sequence/Track equivalent circuit (Figure 15) that
a blocking diode effectively disconnects this circuit when the Sequence/
Track pin is pulled up to +V
voltage. Do not remain in ramp up/down mode indefi nitely. The converter
is characterized and meets all its specifi cations only at the setpoint
voltage (plus or minus any trim voltage). During the ramp-up phase, the
converter is not considered fully in regulation. This may affect perfor-
mance with excessive high current loads at turn-on.
the converter. Avoid noise and long leads on this input. Keep all wiring
very short. Use shielding if necessary. Consider adding a small parallel
ceramic capacitor across the Sequence/Track input (see Figure 14) to
block any external high frequency noise.
very short phase lag between the two converters. This can usually be
ignored.
converters. Be aware of the increasing pull-up bias current and reduced
input impedance.
ramp up/down times and ramp tracking accuracy.
IN
or left open.
www.murata-ps.com
IN
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Power Good Output
The Power Good Output consists of an unterminated BSS138 small signal
fi eld effect transistor and a dual window comparator input circuit driving the
gate of the FET. Power Good is TRUE (open drain, high impedance state) if the
converter’s power output voltage is within about ±10% of the setpoint. Thus,
the PG TRUE condition indicates that the converter is approximately within
regulation. Since an overcurrent condition occurs at about 2% output voltage
reduction, the Power Good does not directly measure an output overcurrent
condition at rated maximum output current. However, gross overcurrent or
an output short circuit will set Power Good to FALSE (+0.2V saturation, low
impedance condition).
Using a simple connection to external logic (and returned to the converter’s
Common connection), the Power Good output is unterminated so that the user
may adapt the output to a variety of logic families. The PG pin may therefore
be used with logic voltages which are not necessarily the same as the input
or output power voltages. Install an external pullup resistor to the logic supply
voltage which is compatible with your logic system. When the Power Good is
out of limit, the FET is at saturation, approximately +0.2V output. Keep this
LOW (FALSE) pulldown current to less than 10mA.
Please note that Power Good is briefl y false during Sequence ramp-up. Ignore
Power Good while in transition.
22A Selectable-Output DC/DC Converters
Figure 16. Equivalent Power Good Circuit
25 Jun 2010
LSN2-T/22-D12
MDC_LSN2-T/22-D12_B03Δ
Non-isolated, DOSA-SIP,
email: [e-mail]
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