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TDF8599ATH/N2/S6CY

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P54
TDF8599A_2 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 02 — 30 June 2009 13 of 54
NXP Semiconductors
TDF8599A
I
2
C-bus controlled dual channel class-D power amplifier
8.4.2 Phase staggering (Slave mode)
In Slave mode with phase lock operation enabled, a phase shift with respect to the
incoming clock signal can be selected to distribute the switching moments over time. In
non-I
2
C-bus mode,
1
⁄
2
π phase shift can be programmed using pin MOD. In I
2
C-bus mode,
five different phase shifts (
1
⁄
4
π,
1
⁄
3
π,
1
⁄
2
π,
2
⁄
3
π,
3
⁄
4
π) can be selected using the I
2
C-bus
bits (IB3[D1:D3]). See Table 8 for selection of the phase shift in non-I
2
C-bus mode with pin
MOD. An additional capacitor must be connected to pin SSM when
1
⁄
4
π phase shift is
used (see Figure 8). An example of using
1
⁄
2
π phase shift for BD modulation is shown in
Figure 12.
a. Phase switching cycle.
b. Inverted signal to the modulator.
Fig 11. BD modulation
001aai781
INxP
OUTxP
OUTxP, OUTxN
001aai782
INxN
OUTxN
TDF8599A_2 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 02 — 30 June 2009 14 of 54
NXP Semiconductors
TDF8599A
I
2
C-bus controlled dual channel class-D power amplifier
8.4.3 Parallel mode
In Parallel mode; the two output stages operate in parallel to enlarge the drive capability.
The inputs and outputs for Parallel mode must be connected on the Printed-Circuit Board
(PCB) as shown in Figure 13. The parallel connection can be made after the output filter,
as shown in Figure 13 or directly to the device output pins (OUTxP and OUTxN).
In Parallel mode, the channel 1 I
2
C-bus bits can be programmed using the I
2
C-bus.
8.5 Protection
The TDF8599A includes a range of built-in protection functions. How the TDF8599A
manages the various possible fault conditions for each protection is described in the
following sections:
Fig 12. Master and slave operation with
1
⁄
2
π phase shift
001aai783
OUT1P phase
0
π
OUT1N
OUT2P
OUT2N
OUT1P
OUT1N
OUT2P
master
slave
OUT2N
π
1
2
π
2
3
Fig 13. Parallel mode
001aak077
IN1P
MOD
R
MOD
IN2N
IN1N
OUT1N
OUT2N
OUT1P
OUT2P
+
−
−
+
IN2P
TDF8599A
TDF8599A_2 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 02 — 30 June 2009 15 of 54
NXP Semiconductors
TDF8599A
I
2
C-bus controlled dual channel class-D power amplifier
8.5.1 Thermal foldback
Thermal Foldback Protection (TFP) is tripped when the average junction temperature
exceeds the threshold level (145 °C). TFP decreases amplifier gain such that the
combination of power dissipation and R
th(j-a)
create a junction temperature around the
threshold level. The device will not completely switch off but remains operational at the
lower output power levels. If the average junction temperature continues to increase, a
second built-in temperature protection threshold level shuts down the amplifier completely.
8.5.2 Overtemperature protection
If the average junction temperature (T
j
) > 160 °C, OverTemperature Protection (OTP) is
tripped and the power stage shuts down immediately.
8.5.3 Overcurrent protection
OverCurrent Protection (OCP) is tripped when the output current exceeds the maximum
output current of 8 A. OCP regulates the output voltage such that the maximum output
current is limited to 8 A. The amplifier outputs keep switching and the amplifier is NOT
shutdown completely. This is called current limiting.
OCP also detects when the loudspeaker terminals are short circuited or one of the
amplifier’s demodulated outputs is short circuited to one of the supply lines. In either case,
the shorted channel(s) are switched off.
The amplifier can distinguish between loudspeaker impedance drops and a low-ohmic
short across the load or one of the supply lines. This impedance threshold depends on the
supply voltage used. When a short is made across the load causing the impedance to
drop below the threshold level, the shorted channel(s) are switched off. They try to restart
every 50 ms. If the short circuit condition is still present after 50 ms, the cycle repeats. The
average power dissipation will be low because of this reduced duty cycle.
When a channel is switched off due to a short circuit on one of the supply lines, Window
Protection (WP) is activated. WP ensures the amplifier does not start-up after 50 ms until
the supply line short circuit is removed.
8.5.4 Window protection
Window Protection (WP) checks the PWM output voltage before switching from Standby
mode to Mute mode (with both outputs switching) and is activated as follows:
Table 9. Overview of protection types
Protection type Reference
Thermal foldback
Section 8.5.1
Overtemperature
Section 8.5.2
Overcurrent
Section 8.5.3
Window
Section 8.5.4
DC Offset
Section 8.5.5
Undervoltage
Section 8.5.6
Overvoltage
Section 8.5.6
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P51P52-P54

TDF8599ATH/N2/S6CY

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Manufacturer:
NXP Semiconductors
Description:
IC POWER AMP CLASS D I2C 36HSOP
Lifecycle:
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