TDA8922C_1 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 01 — 7 September 2009 14 of 40
NXP Semiconductors
TDA8922C
2 × 75 W class-D power amplifier
[1] V
DD
is the supply voltage on pins VDDP1, VDDP2 and VDDA.
[2] V
SS
is the supply voltage on pins VSSP1, VSSP2, VSSA and VSSD.
[3] Unbalance protection activated when V
DDA
> 2 ×|V
SSA
| OR |V
SSA
| > 2 × V
DDA
.
[4] With respect to SGND (0 V).
[5] The transition between Standby and Mute modes has hysteresis, while the slope of the transition between Mute and Operating modes is
determined by the time-constant of the RC network on pin MODE; see Figure 8.
[6] DC output offset voltage is gradually applied to the output during the transition between Mute and Operating modes. The slope caused
by any DC output offset is determined by the time-constant of the RC network on pin MODE.
[7] At a junction temperature of approximately T
act(th_fold)
− 5 °C, gain reduction commences and at a junction temperature of approximately
T
act(th_prot)
, the amplifier switches off.
12. Dynamic characteristics
12.1 Switching characteristics
T
act(th_fold)
thermal foldback activation
temperature
closed loop SE voltage gain
reduced with 6 dB
[7]
- 153 - °C
Table 8. Static characteristics
…continued
V
DD
=30V; V
SS
=
−
30 V; f
osc
= 350 kHz; T
amb
= 25
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Fig 8. Behavior of mode selection pin MODE
Standby Mute On
5.5
010aaa585
V
MODE
(V)
4.22.92.10.80
V
O
(V)
V
O(offset)(mute)
V
O(offset)(on)
slope is directly related to the time-constant
of the RC network on the MODE pin
Table 9. Dynamic characteristics
V
DD
=30V; V
SS
=
−
30 V; T
amb
= 25
°
C; unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Unit
Internal oscillator
f
osc(typ)
typical oscillator frequency R
OSC
= 30.0 kΩ 290 345 365 kHz
f
osc
oscillator frequency 250 - 450 kHz
External oscillator input or frequency tracking; pin OSC
V
OSC
voltage on pin OSC HIGH-level SGND + 4.5 SGND + 5 SGND + 6 V
V
trip
trip voltage - SGND + 2.5 - V
f
track
tracking frequency
[1]
500 - 900 kHz