MFS5600AMBAFES datasheet(25/118 Pages) NXP

25 / 118 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

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Rshunt

10 m

Lsw2

4.7 H

0.1 F

22 F

SWIN

10 F

CONTROL,

DRIVER

AND

LOGIC

SW2BOOT

VCC

SW2CSP

SW2FB

SW2GHS

EN2

SW2GLS

SW2LX

SW2CSN

Figure 9. SW2 application schematic with Rshunt current sensing

The power dissipation on PRSHUNT = ISW22 * Rshunt. For example, when ISW2 = 5.0 A and Rshunt = 0.01 Ω,

PRSHUNT is 0.25 W.

The SW2 current limitation is calculated as OTP_SW2_ILIM divided by the Rshunt. For example, for

OTP_SW2_ILIM = 80 mV and Rshunt = 0.01 Ω, the peak current limit is 8.0 A.

12.2.1.2.2 Inductor DCR current sense

For high current applications (ISW2 > 8.0 A), the power dissipation in the current sense resistor becomes non-

negligible (> 0.6 W). In that case, the DCR current sense technique can be a good alternative, using the intrinsic

DCR of the inductor to sense the current. However, the inductor DCR value is less accurate than a shunt

resistor, which impacts the current limit accuracy. A higher resistance value means a lower current limitation,

and less accuracy means a wider current limitation range.

Figure 10. DCR current sense with a single capacitor

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RDCR

LSW2

0.047 F

22 F

SWIN

10 F

CONTROL,

DRIVER

AND

LOGIC

SW2BOOT

VCC

SW2CSP

SW2FB

SW2GHS

EN2

SW2GLS

SW2LX

SW2CSN

When R1 and C1 are selected in such a way that the RC time constant is equal to the ratio of inductance and its

series resistance, the voltage across C1 is directly proportional to the inductor current.

R1 × C1 = LSW2 / RDCR

Select R1 = a resistor in the kΩ range or C1 = a capacitor in the range of several hundred nF, and calculate the

other components.

FS5600

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 4 — 29 April 2024

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