Switching audio frequency power amplifier TDA8925. Reference data

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Switching audio power amplifier TDA8925. Reference data

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Encyclopedia of radio electronics and electrical engineering / Application of microcircuits

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Philips Semiconductors has announced an output switching stage microcircuit for creating a Class D audio power amplifier (AMP) with an output power of 2 x 15 to 2 x 25 W with an efficiency of more than 94%. The TDA8925 microcircuit (UMZCH) is powered from a bipolar source with a voltage from ±7,5 to ±30 V and has its own current consumption of about 25 mA. Thanks to the key operating mode of the power stage (UMZCH) and, accordingly, such a high efficiency, there is no need to install the microcircuit on a cooling radiator. The microcircuit (UMZCH) is equipped with a diagnostic output, a low voltage level at which signals overheating of the output stage or a short circuit in the load circuit. TDA8925 (UMZCH) has terminal protection against static electricity and is housed in a DBS17P plastic housing (Fig. 1) for conventional printed circuit installation.

Switching audio frequency power amplifier TDA8925. Reference data. Pin assignment TDA8925 in plastic housing DBS17P
Rice. 1. Pinout of TDA8925 in plastic housing DBS17P

The microcircuit has the following distinctive features:

high efficiency (more than 94%);
supply voltage from ±7,5 V to ±30 V;
ultra-small quiescent current - 25 mA;
high output power;
diagnostic output;
load switching circuit - stereo unbalanced output;
protection against static electricity;
does not require a heatsink.

Areas of application of the microcircuit:

TVs;
music centers;
multimedia complexes;
any audio equipment with mains power.

The block diagram of the microcircuit is shown in fig. 2, the purpose of the conclusions - in table. 1, and a typical switching circuit - in fig. 3.

Switching audio frequency power amplifier TDA8925. Reference data. TDA8925 block diagram
Rice. 2. Block diagram of the TDA8925 chip

Table 1. Pin assignment of the TDA8925 chip

Pin number	Signal	Description
1	SW1	Digital input channel 1
2	REL 1	Digital output 1, the signal changes synchronously with the signal at the input SW1 with a delay
3	DIAG	Diagnostic output, open drain, low level - active (on temperature exceeding 150°C and current - 3 A)
4	EN1	Channel 1 enable input
5	VDD1	Channel 1 supply voltage
6	BOAT1	Channel 1 bootstrap capacitor
7	OUT1	Channel 1 output
8	VSS1	General 1
9	STAB	Internal stabilizer output
10	VSS2	General 2
11	OUT2	Channel 2 output
12	BOAT2	Channel 2 bootstrap capacitor
13	VDD2	Channel 2 supply voltage
14	EN2	Channel 2 enable input
15	POWERUP	Internal reference switching enable input
16	REL 2	Digital output 2, the signal changes synchronously with the signal at the input SW1 with a delay
17	SW2	Digital input channel 2

It is quite easy to implement protection against a short circuit in the load. If this happens, the current consumed by the microcircuit increases. If it reaches a value of 3 A, the internal detector is triggered, and on the pin. 1 (DIAG) low potential is formed. This signal can be used to control the power-on input of the microcircuit - POWERUP (pin 15). In operating mode, this pin must be at least VCC + 5 V.

The electrical characteristics of the microcircuit for direct and alternating current are given in Table. 2 and 3.

Table 2. DC electrical characteristics of the TDA8925 chip (at Vp = ±15 V, T am b = 25°C).

designation	Description	Conditions	Min.	Type.	Max.	Ed. amend.
Food
VP	Supply voltage		±7,5	±15	±30	В
IQ (tot)	Quiescent current	Load off	-	25	45	mA
Internal stabilizer (pin 9, STAB)
Vo(STAB)	Output voltage	About VSS	11,7	13	14,3	В
Pulse inputs (pin 1 and 17, SW1 and SW2)
Vi h	High input voltage	About VSS	10	-	15	В
VIL	Low input voltage	About VSS	0	-	2	В
Control outputs (pin 2 and 16, REL1 and REL2)
VOH	High input voltage	About VSS	10	-	15	В
V OL	Low input voltage	About VSS	0	-	2	В
Diagnostic output (pin 3, DIAG, open drain)
V OL	Low output voltage		0	-	1,0	В
I lo	Leakage current		-	-	50	μA
Enable inputs (pin 4 and 14, EN1 and EN2)
Vi h	High input voltage	About VSS	9	-	15	В
Vil	Low input voltage	About VSS	0	5	-	В
VEN (hys)	Hysteresis voltage		-	4	-	В
II (EN)	Input current		-	-	300	μA
Chip enable input (pin 15, POWERUP)
V POWERUP	Operating voltage	About VSS	5	-	12	В
h(POWERUP)	Input current	v powerup = 12V	-	100	170	μA
Temperature protection
TDIAG	Switch-on temperature	v diag - v diag (low)	150	-	-	° C
THYS	Hysteresis	v diag - v diag (low)	-	20	-	° C
current protection
IO (ocpl)	Protection current level		-	3,5	-	A

Rice. 3. Typical scheme for switching on the TDA8925 chip (click to enlarge)

Table 3. Electrical characteristics of the TDA8925 chip for alternating current

designation	Description	Conditions	Min.	Type.	Max.	Ed. amend.
PO	output power	RL = 8 ohm
		THD = 0,5%	10	12	-	Tues
		THD = 10%	14	15	-	Tues
		RL = 6 ohm
		THD = 0,5%	-	16	-	Tues
		THD = 10%	-	20	-	Tues
THD	Harmonic distortion level	PO = 1W
		fi = 1 kHz	-	0,05	0,1	%
		fi= 10 kHz	-	0,2	-	%
n	Performance	P 0 \u2d 15 x 1 W; f = XNUMX kHz	-	94	-	%

Publication: remserv.ru

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