BD9DA00MF datasheet(24/53 Pages) ROHM

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BD9DA00MF

Datasheet

TSZ02201-0J2J0AB01940-1-2

18.Mar.2025 Rev.001

www.rohm.com

TSZ22111 • 15 • 001

Function Explanations – continued

2. Protection

(1) Over Current Protection (OCP) / Short Circuit Protection (SCP)

Over Current Protection (OCP) restricts the flowing current through the Low-Side FET and the High-Side FET for every

switching period. When the Low-Side FET is on, the Low-Side FET remains on while the inductor current is more than

the Low-Side OCP setting value ILOCP. When the inductor current becomes ILOCP or less, the device can turn on the

High-Side FET. For ILOCP settings, refer to the Selection of Components Externally Connected 7. OCP Setting Resister.

When the inductor current becomes the High-Side OCP IHOCP = 17.5 A (Typ) or more while the High-Side FET is on,

the High-Side FET is turned off. Output voltage may decrease by changing frequency and duty due to the OCP

operation.

Short Circuit Protection (SCP) function is a Hiccup mode. After 3 ms (Typ) from the beginning of soft start, and after

SS/REF voltage (VSSREF) reaches 0.6 V (Typ), if VFB is 80 % (Typ) of FB reference voltage VREF or less, or over current

protection is detected for 31 consecutive cycles, the device shuts down for 117 ms (Typ), and then the device restarts.

Do not exceed the maximum junction temperature (Tjmax = 125 °C) during OCP and SCP operation.

VOUT

VFB

Low Side FET

Internal Gate Signal

Inductor Current

Low Side OCP

Internal Signal

SCP

Internal Signal

117 ms (Typ)

IHOCP

High Side OCP

Internal Signal

Less than

OCP 31 counts

VPGD

VREF x / 80 % (Typ)

VREF x 92.5 % (Typ)

ILOCP

OCP 31 counts

High Side FET

Internal Gate Signal

VSW

117 ms (Typ)

Less than

OCP 31 counts

Figure 43. OCP and SCP Timing Chart

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