TPS53513 datasheet(21/44 Pages) TI2

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1.15

1.17

1.19

1.21

1.23

1.25

Output Current (A)

D-CAP3

D-CAP2

C013

IN = 12 V

DD = 5 V

OUT = 1.2 V

SW = 500 kHz

A = 25°C

OUT = 1

Mode = FCCM

1.15

1.17

1.19

1.21

1.23

1.25

Output Current (A)

D-CAP3

D-CAP2

C014

IN = 12 V

DD = 5 V

OUT = 1.2 V

SW = 500 kHz

A = 25°C

OUT = 1

Mode = Auto-skip

CSP

CSN

CSP

CSN

CSN_NEW

(sample at valley of CSP)

CSP

CSN

CSN_NEW

(sample at valley of CSP)

CSP

CSN

TPS53513

www.ti.com

SLUSBP9C – SEPTEMBER 2013 – REVISED JUNE 2018

Product Folder Links: TPS53513

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Figure 37. Continuous Conduction Mode (CCM) With

Sample and Hold Circuitry

Figure 38. Discontinuous Conduction Mode (DCM) With

Sample and Hold Circuitry

Figure 39. Continuous Conduction Mode (CCM) Without

Sample and Hold Circuitry

Figure 40. Discontinuous Conduction Mode (DCM) Without

Sample and Hold Circuitry

Figure 41. Output Voltage vs Output Current

Figure 42. Output Voltage vs Output Current

7.3.4.3 Adaptive Zero-Crossing

The TPS53513 device uses an adaptive zero-crossing circuit to perform optimization of the zero inductor-current

detection during skip-mode operation. This function allows ideal low-side MOSFET turn-off timing. The function

also compensates the inherent offset voltage of the Z-C comparator and delay time of the Z-C detection circuit.

Adaptive zero-crossing prevents SW-node swing-up caused by too-late detection and minimizes diode

conduction period caused by too-early detection. As a result, the device delivers better light-load efficiency.

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