參數(shù)資料
型號(hào): TDA8939
廠商: NXP Semiconductors N.V.
英文描述: Zero dead time Class-D 7.5 A power comparator
中文描述: 零死時(shí)間D類7.5甲功率比較
文件頁數(shù): 5/21頁
文件大?。?/td> 99K
代理商: TDA8939
9397 750 13023
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Objective data sheet
Rev. 01 — 22 April 2004
5 of 21
Philips Semiconductors
TDA8939
Zero dead time Class-D 7.5 A power comparator
8.
Functional description
8.1 General
The TDA8939 class-D power comparator is designed for use in fully digital open-loop
class-D audio applications. Excellent timing accuracy with respect to delay times and rise
and fall times is achieved and one of the most important sources of distortion in a full
digital open-loop audio amplifier is eliminated; the zero dead time switching concept is
included. The TDA8939 contains two independent class-D output stages with high power
D-MOS switches, drivers, timing and control logic. For protection a temperature sensor, a
maximum current detection and overvoltage detection circuit are integrated. An internal
protection latch keeps the power comparator in shut-down mode after a fault condition has
been detected. External reset of the latch is required via the enable input.
8.2 Protections
Overtemperature, overcurrent and overvoltage sensors are included in the TDA8939
power comparator. In the event that the maximum temperature, maximum current or
maximum supply voltage is exceeded the diagnostic output is activated (open-drain output
pulled-down via external pull-up resistor).
The diagnostic output pin is activated (active LOW) in case of:
1. Overtemperature (OTP): the junction temperature (T
j
) exceeds a threshold level.
2. Overcurrent (OCP): the output current exceeds the maximum output current threshold
level (e.g. when the loudspeaker terminals are short-circuited it will be detected by the
current protection).
3. Overvoltage (OVP): the supply voltage applied to the power comparator exceeds the
maximum supply voltage threshold level.
The TDA8939 is self-protecting. If a fault condition (OTP, OCP or OVP) is detected it will
pull-down the diagnostic output (pin 7), while at the same time shutting down the power
stage. In case of a fault condition in one of the half-bridges or output channel the other
half-bridge and output channel will also shut down. All protections trigger a latch which
ensures that the power stage remains deactivated until the latch is reset again.
The latch is reset by switching the enable voltage of the power stage to LOW level. Both
set (S) and reset (R) inputs of the protection latch trigger on a negative falling slope.
STAB1
V
SSP1
OUT1
BOOT1
V
DDP1
V
SSD
SUB
19
20
21
22
23
24
-
decoupling internal stabilizer for logic supply channel 1
negative power supply voltage for channel 1
PWM output channel 1
bootstrap capacitor 1
positive power supply voltage for channel 1
negative digital supply voltage
heat spreader of package; internally connected to V
SSD
Table 3:
Symbol
Pin description
…continued
Pin
Description
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