CRD3511-Q1 Cirrus Logic Inc, CRD3511-Q1 Datasheet - Page 24

• Manufacturer Part Number: CRD3511-Q1
• Description: BOARD REF CS3511 4LYR 1OZ CU
• Manufacturer: Cirrus Logic Inc

Specifications of CRD3511-Q1

• Amplifier Type: Class D
• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 11.4W x 2 @ 6 Ohm
• Voltage - Supply: 8.5 V ~ 13.2 V
• Operating Temperature: -10°C ~ 70°C
• Board Type: Fully Populated
• Utilized Ic / Part: CS3511
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1577

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9. THERMAL CHARACTERISTICS
9.1
Junction to Case Thermal Impedance
Thermal Flag
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 cou-
pled 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
immediately surrounding the CS3511. 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:
θ
where,
θ
T
T
P
θ
CA
CA
JC
J(MAX)
A
D
= Ambient temperature in °C
= RMS power dissipation of the device, equal to 0.176*P
= Junction-to-case thermal resistance of the device in °C/Watt, equal to 1 °C/Watt
= [(T
= Thermal resistance of the metal plane in °C/Watt
= Maximum rated operating junction temperature in °C, equal to 150 °C
J(MAX)
- T
Parameter
A
) / P
D
] - θ
JC
Symbol
RMS-OUT
θ
JC
(assuming 85% efficiency)
Min
-
Typ
1
Max
-
CS3511
DS845F1
°C/Watt
Units