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BD9130NV

TSZ02201-0J3J0AJ00130-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

02.Oct.2014 Rev.002

www.rohm.com

TSZ22111・15・001

2. Description of Functions

(1) Soft-Start Function

During start-up, the soft-start circuit gradually establishes the output voltage to limit the input current. This prevents the

overshoot in the output voltage and inrush current.

(2) Shutdown Function

When EN terminal is “Low”, the device operate in Standby Mode, and all the functional blocks such as reference

voltage circuit,

internal oscillator and drivers are turned OFF. Standby current is 0μA (Typ).

(3) UVLO Function

This circuit detects whether the supplied input voltage is sufficient to obtain the output voltage of this IC. It provides a

hysteresis of 50mV (Typ) to prevent the output from chattering.

Figure 22. Soft-Start, Shutdown, UVLO Timing Chart

(4) Short-Circuit Protection with Time Delay Function

To protect the IC from breakdown, the short-circuit turns the output OFF when the internal current limiter is activated

by resetting UVLO.

Figure 23. Short-Circuit Protection with Time Delay Diagram

Output OFF

Latch

EN

Output Short circuit

Threshold Voltage

Output OFF

Operating mode

Operating mode

EN

Timer Latch

EN

Output OFF

Hysteresis 50mV

Soft start

Standby mode

Operating mode

Standby

mode

Operating mode

Standby

mode

Operating mode

Standby mode

UVLO

EN

UVLO

UVLO

EN