STA540 STMicroelectronics, STA540 Datasheet - Page 14

• Manufacturer Part Number: STA540
• Description: IC AMP AUD DUAL/QUAD MULTIWATT15
• Manufacturer: STMicroelectronics
• Type: Class ABr

Specifications of STA540

• Output Type: 2-Channel (Stereo) or 4-Channel (Quad)
• Max Output Power X Channels @ Load: 38W x 2 @ 4 Ohm; 16W x 4 @ 4 Ohm
• Voltage - Supply: 8 V ~ 22 V
• Features: Short-Circuit and Thermal Protection, Standby
• Mounting Type: Through Hole
• Package / Case: Multiwatt-15 (Vertical, Bent and Staggered Leads)
• Amplifier Class: AB
• No. Of Channels: 4
• Output Power: 24W
• Supply Voltage Range: 8V To 22V
• Thd + N: 0.02% @ 4W, 4ohm, VS=14.4V
• Load Impedance: 8ohm
• Operating Temperature Range: -40°C To +150°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-8880-5

Thermal information
5.1.3
14/23
Calculations using music power
The thermal resistance value calculated in each of the two above examples specifies a
heatsink capable of sustaining the maximum dissipated power. Realistically, however, and
as explained in the Application Note (AN1965), the heatsink can be smaller when the
application is musical content.
When music power is considered the resulting dissipation is about 40% less than the
calculated maximum. Thus, smaller or cheaper heatsinks can be employed. The heatsink
thermal resistance values are modified as follows:
for example 5.1.1: 10.5 W - 40% = 6.3 W, thus giving R
for example 5.1.2: 21 W - 40% = 12.6 W, thus giving R
th_c-amb
th_c-amb
= 6° C/W.
= 14° C/W,
STA540