TDF8599 NXP Semiconductors, TDF8599 Datasheet - Page 19

• Manufacturer Part Number: TDF8599
• Description: I2C-bus controlled dual channel 43 W/2 W single channel 85 W/1 W class-D power amplifier
• Manufacturer: NXP Semiconductors

www.DataSheet4U.com
NXP Semiconductors
TDF8599_1
Product data sheet
8.6.2.1 DC load detection
8.6.2 Load identification (I
DC load detection is only available in I
The default setting is logic 0 for bit IB2[D2] which disables DC load detection. DC load
detection is enabled when bit IB2[D2] = 1. Load detection takes place before the class-D
amplifier output stage starts switching in Mute mode (see
from Standby mode to Mute mode is increased by t
The capacitor connected to pin SEL_MUTE (see
current test pulse, drawn from the positive amplifier output. The diagnostic ‘speaker load’
(or ‘open load’), based on the voltage difference between pins OUTxP and OUTxN is
shown in
Fig 17. DC load detection circuit
Fig 18. DC load detection procedure
Fig 19. DC load detection limits
Figure
19.
CONTROL
CONTROL
out+
out
PWM
PWM
Rev. 01 — 13 November 2008
out (V)
0
2
C-bus mode only)
SPEAKER LOAD
DRIVER
DRIVER
DRIVER
DRIVER
HIGH
HIGH
T
LOW
LOW
d(mute-off)
2
C-bus mode and is controlled using bit IB2[D2].
Class-D power amplifier with load diagnostics
25
350
B
PGND1
PGND2
Figure
T
det(DCload)
V
V
det(DCload)
P
P
OUTN
OUTP
OPEN LOAD
4) is used to create an inaudible
Figure
001aai789
001aai788
17) and the start-up time
001aai787
t (s)
R L
TDF8599
© NXP B.V. 2008. All rights reserved.
19 of 52