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2016-03-0004

PT0489-5

04/29/16

11

PI5PD2560/2561

Dual Channel,

Adjustable Current-Limited Power Switch

AUTO-RETRY FUNCTIONALITY

Some applications require that an overcurrent condition disables the part momentarily during a fault condition and re-enables after

a pre-set time. This auto-retry functionality can be implemented with an external resistor and capacitor. During a fault condition,

FAULTx pulls ENx low disabling the part. The part is disabled when ENx is pulled below the turn-off threshold, and FAULTx

goes high impedance allowing CRETRY to begin charging. The part re-enables when the voltage on ENx reaches the turn-on

threshold, and the auto-retry time is determined by the resistor/capacitor time constant. The part will continue to cycle in this

manner until the fault condition is removed.

IN

O UT1

G ND

/ FAU LT1

IL IM

C1

0.1uF

C3

IN

/ FAU LT2

R1

100k

R2

100k

P ow er Pad

O UT2

R3

20k

C2

VIN

E N1

E N2

C3

0.22uF

C2

0.22uF

VOU T1

VOU T2

Figure 10.Auto-Retry Functionality

Some applications require auto-retry functionality and the ability to enable/disable with an external logic signal. The figure below

shows how an external logic signal can drive EN through RFAULT and maintain auto-retry functionality. The resistor/capacitor

time constant determines the auto-retry time-out period.

IN

O UT1

G ND

/ FAU LT1

IL IM

C1

0.1uF

C3

IN

/ FAU LT2

R1

100k

R2

100k

P ow er Pad

O UT2

R3

20k

C2

VIN

E N1

E N2

C3

0.22uF

C2

0.22uF

VOU T1

VOU T2

Logic signal & drivers

Figure 11.Auto-Retry Functionality With External EN Signal