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PDF TDA8931 Data sheet ( Hoja de datos )
| Número de pieza | TDA8931 | |
| Descripción | Power comparator 1 X 20 W | |
| Fabricantes | NXP Semiconductors | |
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TDA8931
Power comparator 1 × 20 W
Rev. 01 — 14 January 2004
Preliminary data sheet
1. General description
The TDA8931 is a switching power stage for high efficiency class-D audio power amplifier
systems.
It contains a Single-Ended (SE) power stage, drive logic, protection control logic, a full
differential input comparator and a HVP charger to charge the SE capacitor. With this
amplifier a compact 1 × 20 W closed loop self-oscillating digital amplifier system can be
built. The TDA8931 has a high efficiency so that a heat sink is not required up to
20 W (RMS). The system operates on an asymmetrical and a symmetrical supply voltage.
2. Features
s High efficiency
s Operating voltage asymmetrical from 12 V to 35 V
s Operating voltage symmetrical from ±6 V to ±17.5 V
s Thermally protected
s No heat sink required
s Charger for single-ended capacitor
s No pop sound
3. Applications
s Flat panel television sets
s Flat panel monitors
s Multimedia systems
s Wireless speakers
s Micro systems
4. Quick reference data
Table 1: Quick reference data
Symbol Parameter
Conditions
General
VP operating supply
voltage
asymmetrical
symmetrical
Iq
Istb
Isleep
quiescent current
standby current
sleep current
Operating mode; VP = 22 V
Standby mode; VP = 22 V
Sleep mode; VP = 22 V
Min Typ Max Unit
12 22 35 V
±6 ±11 ±17.5 V
- 20 30 mA
- 10 15 mA
- 100 200 µA
1 page  
Philips Semiconductors
TDA8931
Power comparator 1 × 20 W
8. Functional description
8.1 General
The TDA8931 is a switching power stage for high efficiency class-D audio power amplifier
systems. It contains a Single-Ended (SE) power stage, drive logic, protection control logic,
a full differential input comparator and a HVP charger to charge the SE capacitor (see
Figure 1). With this amplifier a compact 1 × 20 W closed loop self-oscillating digital
amplifier system can be built. A second order low-pass filter converts the PWM output
signal into an analog audio signal across the speaker.
8.2 Interfacing
The operating modes of the TDA8931 can be controlled by pins POWERUP and ENABLE.
Both pins refer to pin CGND. The device has three modes:
• Sleep mode
• Standby mode
• Operating mode
When pin POWERUP = LOW, the power comparator is in Sleep mode, independent of the
signal on pin ENABLE. In Sleep mode the SE capacitor charger will be discharged.
When pin POWERUP = HIGH and pin ENABLE = LOW the device is in Standby mode. In
Standby mode the device is DC biased and the SE capacitor will be charged and the
output is floating.
When both pins POWERUP and ENABLE are HIGH, the device is in Operating mode. A
level at pin POWERUP greater than 11 V can also enter the Operating mode, independent
of the level on pin ENABLE (see Table 4).
Remark: The switch-on sequence is important. First pin POWERUP = HIGH, then pin
ENABLE = HIGH.
Table 4: Interfacing
Voltage on pin
POWERUP
ENABLE
< 0.8 V
-
3 V to 7 V
< 0.8 V
>3V
> 11 V
-
Mode
Sleep
Standby
Operating
Operating
8.3 Input comparator
The input comparator has a full differential input and is optimized for low noise and low
offset. This results in maximum flexibility in the application.
8.4 Half supply voltage input reference (pin HVPI)
When the device is in Standby mode, the external capacitor C6 (see Figure 5) will be
charged until it reaches the half of the supply voltage. This pin charges capacitor C6
within 0.5 seconds.
9397 750 13847
Preliminary data sheet
Rev. 01 — 14 January 2004
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
5 of 31
5 Page 
Philips Semiconductors
TDA8931
Power comparator 1 × 20 W
10. Limiting values
Table 7: Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol Parameter
Conditions
Min Max Unit
VP operating supply voltage
asymmetrical
symmetrical
12
±6
40 V
±20 V
VENABLE
VOVP
Vn
IORM
Pd(max)
Tj
Tstg
Tamb
maximum voltage on pin ENABLE
maximum voltage on pin OVP
voltage on all other pins
repetitive peak output current
maximum power dissipation
junction temperature
storage temperature
ambient temperature
- 14 V
- 14 V
VSS − 0.3 VDD + 0.3 V
- 8A
- 2.5 W
- 150 °C
−55
+150
°C
−40 +85 °C
11. Thermal characteristics
Table 8:
Symbol
Rth(j-a)
Rth(j-p)
Rth(j-c)
Thermal characteristics
Parameter
Conditions
thermal resistance junction to ambient in free air
thermal resistance junction to pin
in free air
thermal resistance junction to case in free air
Typ
[1] 24
[2] 16
[3] 3
Unit
K/W
K/W
K/W
[1] Measured in the application board.
[2] Vp = 22 V; RL = 4 Ω; Vripple = 2 V (p-p); fripple = 100 Hz with feed-forward network (470 kΩ and
15 nF).
[3] Strongly depending on where you measure on the case.
12. Static characteristics
Table 9: Characteristics
VP = 22 V; Tamb = 25 °C; fcarrier = 290 kHz; unless otherwise specified.
Symbol Parameter
Conditions
Supply voltage
VP operating supply voltage
VP = VDDP − VSSP
asymmetrical
symmetrical
Iq quiescent current
with load; filter and snubbers
connected
Istb standby current
Standby mode; SE capacitor
charged
Isleep
sleep current
Sleep mode
Min Typ Max Unit
12 22 35 V
±6 ±11 ±17.5 V
- 20 30 mA
- 10 15 mA
- 100 200 µA
9397 750 13847
Preliminary data sheet
Rev. 01 — 14 January 2004
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
11 of 31
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| PDF Descargar | [ Datasheet TDA8931.PDF ] | |
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