CS44130 Cirrus Logic, CS44130 Datasheet - Page 22

• Manufacturer Part Number: CS44130
• Description: 60 W Quad Half-Bridge Digital Amplifier Power Stage
• Manufacturer: Cirrus Logic

22
9. THERMAL CHARACTERISTICS
9.1
This device is designed to have the metal flag on the bottom of the device soldered directly to a metal plane on the
PCB. To enhance the thermal dissipation capabilities of the system, this metal plane should be coupled with vias to
a large metal plane on the backside (and inner ground layer, if applicable) of the PCB.
In either case, it is beneficial to use copper fill in any unused regions inside the PCB layout, especially those imme-
diately surrounding the CS44130. In addition to improving in electrical performance, this practice also aids in heat
dissipation.
The heat dissipation capability required of the metal plane for a given output power can be calculated as follows:
T
where,
T
T
T
P
θ
Junction to Case Thermal Impedance
Junction to Ambient Thermal Impedance
JC
CA
CA
J(MAX)
A
D
1. θ
= Ambient temperature in °C
= RMS power dissipation of the device, equal to 0.10*P
= Junction-to-case thermal resistance of the device in °C/Watt
= [(T
= Thermal resistance of the metal plane in °C/Watt
= Maximum rated operating junction temperature in °C, equal to 150 °C
Thermal Flag
JA
J(MAX)
is stated for a system with a thermal flag as described in
- T
A
) / P
D
] - θ
Parameter
JC
(Note 1)
2-Layer PCB
4-Layer PCB
RMS
(assuming 90% efficiency)
Symbol
Section 9.1
θ
θ
JC
JA
Min
below.
-
-
-
18.5
Typ
20
1
Max
-
-
-
CS44130
DS690PP1
°C/Watt
°C/Watt
Units