ST TDA7851F User Manual

TDA7851F

4 x 48 W MOSFET quad bridge power amplifier

Features

■Multipower BCD technology

■High output power capability:

–4 x 48 W/4 Ω max.

–4 x 28 W/4 Ω @ 14.4 V, 1 kHz, 10 %

–4 x 72 W/2 Ω max.

■MOSFET output power stage

■Excellent 2 Ω driving capability

■Hi-Fi class distortion

■Low output noise

■Standby function

■Mute function

■Automute at min. supply voltage detection

■Low external component count:

–Internally fixed gain (26 dB)

–No external compensation

–No bootstrap capacitors

Datasheet −production data

'!0'03

Flexiwatt25

–Fortuitous open GND

–Reversed battery

–ESD

Description

■Output DC offset detector

■Protections:

–Output short circuit to GND, to Vs, across the load

–Very inductive loads

–Overrating chip temperature with soft thermal limiter

–Load dump voltage

Table 1. Device summary

The TDA7851F is a breakthrough MOSFET technology class AB audio power amplifier, designed for high-power car radio.

The fully complementary P-Channel/N-Channel output structure allows a rail-to-rail output voltage swing. This, combined with high output current and minimized saturation losses, sets new power references in the car-radio field, with unparalleled distortion performance.

Order code	Package	Packing
TDA7851F	Flexiwatt25	Tube

June 2012

Doc ID 17714 Rev 2

1/15

This is information on a product in full production.

www.st.com

List of tables	TDA7851F

List of tables

Table 2. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 4. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Table 5. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2/15	Doc ID 17714 Rev 2

TDA7851F	List of figures

List of figures

Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 3. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Figure 4. Quiescent current vs. supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Figure 5. Output power vs. supply voltage (RL = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 6. Output power vs. supply voltage (RL = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 7. Distortion vs. output power (RL = 4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 8. Distortion vs. output power (RL = 2 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 9. Distortion vs. frequency (RL = 4 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 10. Distortion vs. frequency (RL = 2 Ω). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 11. Crosstalk vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Figure 12. Supply voltage rejection vs. frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 13. Output attenuation vs. supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 14. Power dissipation and efficiency vs. output power (RL = 4 Ω, SINE) . . . . . . . . . . . . . . . . . 10 Figure 15. Power dissipation and efficiency vs. output power (RL = 2 Ω, SINE) . . . . . . . . . . . . . . . . . 10 Figure 16. Power dissipation vs. output power (RL = 4 Ω, audio program simulation) . . . . . . . . . . . . 11 Figure 17. Power dissipation vs. output power (RL = 2 Ω, audio program simulation) . . . . . . . . . . . . 11 Figure 18. ITU R-ARM frequency response, weighting filter for transient pop. . . . . . . . . . . . . . . . . . . 11 Figure 19. Flexiwatt25 mechanical data and package dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Doc ID 17714 Rev 2

3/15

Contents	TDA7851F

Contents

1	Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . .		. 5
	1.1	Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
	1.2	Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
2	Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		6
	2.1	Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
	2.2	Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
3	Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		7
	3.1	Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	3.2	Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	7
	3.3	Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	9
4	Application hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		12
	4.1	SVR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	4.2	Input stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	4.3	Standby and muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
	4.4	Heatsink definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	12
5	Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		13
6	Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .		14

4/15	Doc ID 17714 Rev 2

TDA7851F	Block diagram and application circuit

1 Block diagram and application circuit

1.1Block diagram

Figure 1. Block diagram

6CC		6CC
34 "9
-54%			/$
			/54
).			/54
			07 '.$
			/54
).			/54
			07 '.$
			/54
).			/54
			07 '.$
			/54
).			/54
			07 '.$
!# '.$	362	4!"	3 '.$

'!0'03

1.2Application circuit

Figure 2. Application circuit

#	#
Μ&	Μ&
	6CC	6CC
2

34 "9
+	#
2	Μ&
-54%
+	#
#	Μ&
).
Μ&
).
# Μ&
).
# Μ&
).
# Μ&	3 '.$
	#
	Μ&

/54

/54

/54

			/54
362	/$	4!"
#			!#
Μ&
		2
			6
		+
/$ /54

'!0'03

Doc ID 17714 Rev 2

5/15