BD28412MUV Datasheet, PDF (29/44 Pages) Rohm – 9W+9W Analog Input Class D Speaker Amplifier

BD28412MUV
Datasheet
(1) Output Short Protection (Short to the Power Supply)
This IC has PWM output short protection circuit that stops the PWM output when the output speaker (after
LC-filter) is short-circuited to the power supply unintentionally.
Detecting condition - It will detect when MUTEX pin is set High and the current that flows into the PWM output pin
becomes 8A(Typ) or more for 250nsec (Typ). If detected, the PWM output instantaneously
goes to the state of High-Z_Low and IC is latch.
Releasing method - ① After turning MUTEX terminal to Low (holding time to Low = 10msec(Min)), turn back to
High again.
② Restore power supply after the voltage dropped to internal power on reset circuit
activating power supply voltage V_CC＜3V (hold for 10msec (Min)).
Short to V_CC
Release from short to V_CC
OUT1P
OUT1N
OUT2P
OUT2N
Over-Current
ERRORX
MUTEX
PWM out ： IC latches with High-Z_Low
8A(Typ)
t
Released from latch state
t
t
250nsec(Typ)
Latch release
t
10msec(Min)
Figure 49. Output Short Protection Sequence
(Short to Power Supply)
www.rohm.com
© 2016 ROHM Co., Ltd. All rights reserved.
TSZ22111 • 15 • 001
29/40
TSZ02201-0C1C0E900620-1-2
21.Sep.2016 Rev.003