tps4100 Tripath Technology Inc., tps4100 Datasheet - Page 9

• Manufacturer Part Number: tps4100
• Description: Four Channel Bridged Output Power Stage
• Manufacturer: Tripath Technology Inc.

%
0.05
0.02
0.01
100
0.5
0.2
0.1
50
20
10
5
2
1
1
Typical Performance AM Mode
Application Information
G E N E R A L D E S C R I P T I O N
The TPS4100 is a 4-channel BTL (Bridge Tied Load) audio amplifier power stage that operates on a
single supply voltage ranging from 10-26V. The device is targeted specifically to meet the demands of
OEM and aftermarket automobile in-dash head units. With a single supply voltage of 25V, the device
delivers four 100 Watt (saturated square wave) channels into 4 ohm. Since the TPS4100 is a switching
amplifier, the average dissipation at low to medium output power is far superior to best in class AB
amplifiers specifically designed for in-dash head units.
P O W E R S U P P L Y R E Q U I R E M E N T S
The device is configured to operate from a single supply voltage of 10-26V. This allows the device to
operate from an automobile battery under various conditions including: battery voltage with the engine off,
alternator voltage with engine running and boosted voltage operation up to 26V using a DC-DC converter
or voltage booster. The sleep pin must be driven from a microcontroller or external 3.3V or 5.0V power
supply.
A M M O D E
When used in conjunction with a Class-T controller, such as TCD6001, the TPS4100 is configured as a
high power, high efficiency, four channel switching amplifier. The TPS4100 also has an additional
amplifier mode named “AM Mode.” By pulling the AM pin to a logic high level, the amplifier is configured
as a Class B amplifier as opposed to the normal, Class-T amplifier.
AM mode significantly reduces EMI generation since the output amplifiers are now operated in linear
mode. Operating in Class B mode also reduces the TPS4100 efficiency especially at low to medium
output powers. Due to this increased power dissipation, it is recommended that the AM mode is used for
applications such as AM radio playback where the average output level is minimal and a switching
amplifier would most effect radio reception.
9
AM MO DE
R
f = 1Khz
BW = 22Hz - 20kHz(AES17)
L
= 4
:
2
THD+N versus Output Power
5
V
S
= 14.4V
W
10
V
S
= 16V
20
50
Tripath Technology, Inc. – Preliminary Technical Information
100
80
70
60
50
40
30
20
10
0
0
10
P ower Diss ipation
20
E fficiency and P ower D issipation versus
30
TPS4100 – KL/Rev. 2.5/02.05
Total Output P ower (W )
Total output P ower
40
E ffic ienc y
50
60
R
f= 1 kH z
AM MOD E
V
BW = 22 H z - 20 kH z(AES1 7)
PP
L
70
= 4
= 1 4.4V
:
80
90
100
45
30
15
60
0