LM5056 datasheet(13/46 Pages) TI

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SENSE

RESISTOR

VIN_K

SENSE

FROM SYSTEM

INPUT VOLTAGE

HIGH CURRENT PATH

VIN

TO LOAD

SENSE

RESISTOR

VIN_K

SENSE

FROM SYSTEM

INPUT VOLTAGE

TO LOAD

HIGH CURRENT PATH

VIN

LM5056, LM5056A

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SNVS827A – OCTOBER 2012 – REVISED APRIL 2013

Figure 14. Sense Resistor Connections, Edge Sensed

If the PCB layout and resistor pads allow for it, the connection shown in Figure 15 gives optimal kelvin sensing

performance.

Figure 15. Sense Resistor Connections, Centered Sensed

CVIN, CD, CVREF, CS, and CVDD

Using ceramic bypass capacitors can improve performance in noise heavy environments. Not every pin of the

LM5056/LM5056A is the same when it comes to placing bypass capacitors.

•

CVIN: This capacitor is not required but can improve VIN telemetry performance in noisy situations. Typical

values for the VIN bypass capacitor can range from 1 nF to 100 nF to effectivly reduce input noise. The

voltage on CVIN is high, so a 100 V or higher voltage capacitor will work.

•

CD:The CD capacitor is recommended if the diode is placed far from the LM5056/LM5056A DIODE pin. Too

large of a capacitance will corrupt the voltage waveform across the diode used to measure the absolute

temperature. A typical value of capacitance for CD is 1 nF. The voltage on CD is low, so a 6.3 V or higher

voltage capacitor will work.

•

CVREF: CVREF is required since it is placed on the output of the internal votlage reference. This capacitor

should be a 1

μF ceramic. The voltage on CVREF is low, so a 6.3 V or higher voltage capacitor will work.

•

CS: The current sense amplifier is designed to amplifiy small voltages. Using a bypass capacitor across the

current sense amplifier input pins (VIN_K and SENSE) will facilitate accurate current telemetry. Functional

values of CS can range from 10 nF to 1 μF. The voltage on CS is low, so a 6.3 V or higher voltage capacitor

will work.

•

CVDD: CVDD is required because it provides bypassing from the 5.0 V rail for the internal digital circuitry. This

capacitor should be a 1-

μF ceramic. The voltage on CVDD is low, so a 6.3 V or higher voltage capacitor will

work.

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