LSN2-T/30-D12-C【PDF 7/16 页】CONV DC/DC 150W 30A 0.8-5V SIP

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LSN2-T/30-D12 Series

DOSA-SIP, 30A POL DC/DC Converters

Power-up Sequencing

If a controlled start-up of one or more LSN2-T/30-D12 Series DC/DC converters

is required, or if several output voltages need to be powered-up in a given

sequence, the On/Off control pin can be driven with an external device as per

Figure 4.

Output Overvoltage Protection

LSN2-T/30-D12 SIP Series DC/DC converters do not incorporate output

overvoltage protection. In the extremely rare situation in which the device’s

feedback loop is broken, the output voltage may run to excessively high levels

(V OUT = V IN ). If it is absolutely imperative that you protect your load against

any and all possible overvoltage situations, voltage limiting circuitry must be

provided external to the power converter.

+INPUT

Output Reverse Conduction

Many DC/DCs using synchronous recti?cation suffer from Output Reverse

Conduction. If those devices have a voltage applied across their output before

a voltage is applied to their input (this typically occurs when another power

supply starts before them in a power-sequenced application), they will either

fail to start or self destruct. In both cases, the cause is the “freewheeling” or

“catch” FET biasing itself on and effectively becoming a short circuit.

LSN2-T/30-D12 SIP DC/DC converters do not suffer from Output Reverse

Conduction. They employ proprietary gate drive circuitry that makes them

immune to moderate applied output overvoltages.

Thermal Considerations and Thermal Protection

The typical output-current thermal-derating curves shown below enable

designers to determine how much current they can reliably derive from each

model of the LSN2-T/30-D12 SIPs under known ambient-temperature and air-

?ow conditions. Similarly, the curves indicate how much air ?ow is required to

reliably deliver a speci?c output current at known temperatures.

4.75KΩ

ON/OFF

1KΩ

PWM

Enable

The highest temperatures in LSN2-T/30-D12 SIPs occur at their output

inductor, whose heat is generated primarily by I 2 R losses. The derating curves

were developed using thermocouples to monitor the inductor temperature and

COMMON

10KΩ

varying the load to keep that temperature below +110°C under the assorted

conditions of air ?ow and air temperature. Once the temperature exceeds

+115°C (approx.), the thermal protection will disable the converter. Automatic

restart occurs after the temperature has dropped below +110°C.

As you may deduce from the derating curves and observe in the ef?ciency

Figure 4. On/Off Control Using An External Driver

(Typical circuit)

Output Overcurrent Detection

Overloading the power converter’s output for an extended time will invariably

cause internal component temperatures to exceed their maximum ratings

and eventually lead to component failure. High-current-carrying components

such as inductors, FET’s and diodes are at the highest risk. LSN2-T/30-D12

SIP Series DC/DC converters incorporate an output overcurrent detection and

curves on the following pages, LSN2-T/30-D12 SIPs maintain virtually constant

ef?ciency from half to full load, and consequently deliver very impressive

temperature performance even if operating at full load.

Lastly, when LSN2-T/30-D12 SIPs are installed in system boards, they are

obviously subject to numerous factors and tolerances not taken into account

here. If you are attempting to extract the most current out of these units under

demanding temperature conditions, we advise you to monitor the output-

inductor temperature to ensure it remains below +110°C at all times.

shutdown function that serves to protect both the power converter and its load.

If the output current exceeds it maximum rating by typically 50% or if the

output voltage drops to less than 98% of it original value, the LSN2-T/30-D12’s

internal overcurrent-detection circuitry immediately turns off the converter,

which then goes into a “hiccup” mode. While hiccupping, the converter will

continuously attempt to restart itself, go into overcurrent, and then shut down.

Once the output short is removed, the converter will automatically restart itself.

www.murata-ps.com/support

MDC_LSN2-T/30-D12 Series.C01 Δ Page 7 of 16

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