TDF8591TH NXP Semiconductors, TDF8591TH Datasheet - Page 7

• Manufacturer Part Number: TDF8591TH
• Description: The TDF8591TH is a high-efficiency class-D audio power amplifier with low powerdissipation for application in car audio systems
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDF8591TH_1
Product data sheet
When the loudspeaker terminals are short-circuited and the OCP is triggered the
TDF8591TH is switched off completely and will try to restart every 100 ms (see
A short-circuit of the loudspeaker terminals to one of the supply lines will also trigger the
activation of the OCP and the amplifier will shut down. During restart the window
protection will be activated. As a result the amplifier will not start up after 100 ms and pin
DIAG will remain LOW until the short-circuit to the supply lines is removed.
Fig 5. Pin DIAG with activated current limiting
Fig 6. Restart of the TDF8591TH
•
•
•
50 ms after switch off pin DIAG will be released
100 ms after switch off the amplifier will return to mute
150 ms after switch off the amplifier will return to operation. If the short-circuit
condition is still present after this time this cycle will be repeated. The average
dissipation will be low because of the small duty cycle
speaker terminals)
current in the
(between the
input voltage
PWM output
short-circuit
pin DIAG
V
V
SSA
SSA
Rev. 01 — 5 March 2008
+ 8 V
+ 2 V
V
SSA
2
3
1
4
2
Ch1
Ch3
100 W SE (4 ) or 1
50.0 V
5.00 V
50 ms
M 20.0 ms A Ch1 ~ 1.28 V
Ch2
Ch4
50 ms
500 mV
10.0 V
310 W BTL (4 ) class-D amplifier
M 25.0 ms
50 ms
Ch1 mean
5.03 V
001aad838
TDF8591TH
Ch3
© NXP B.V. 2008. All rights reserved.
001aah365
1.80 V
Figure
7 of 34
6):