LV5069JA Datasheet, PDF (12/20 Pages) ON Semiconductor – Step-down Switching Regulator Controller

LV5069JA
Hiccup Over-Current Protection
Over current limit (ICL) is set by current sensing resister R1 and resistance (R2) between VIN and ILIM.
The setting value of ICL is given by the equations (3) and (4).
VLIM = R2 × ILIM = R2 × 55 × 10^-6 [V]
(3)
VLIM _{R2 × 55 × 10}^-6
ICL = _R1 =
R1
[A]
(4)
When the voltage between VIN and RSNS (VRSNS) is higher than the voltage between VIN and ILIM for 15 consecutive
times, the protection deems it as over current and stops the IC.
Stop period (THIC) is defined by the external capacitor (C8) of the C-HICCUP.
The setting value of THIC is given by the equations (5).
C8 × VtHIC _{C8 × 1.29}
THIC = _IHIC = _{2.0 × 10-6} [s]
(5)
When C-HICCUP is about 1.29V, the IC starts up. Regardless of a status; whether it starts up or SS charge, once over
current is detected, the IC stops again and when the protection does not detect over current status, the IC starts up again.
When the RSNS pin exceeds the overcurrent
limit value for 15 continuous times, the IC stops.
VIN
RSNS
VLIM
* Stop time is determined by the
external capacitor connected to
the C-HICCUP pin
C-HICCUP
1.29V
SS
FB
FB=1.05V
When the C-HICCUP pin exceeds 1.29V,
the IC re-starts by soft-start.
•if the overcurrent is detected,
then IC stops again.
•if the overcurrent is detected,
then IC re-starts normally.
PG
* FB = 1.1V ⇒ High
No.A2177-12/20