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NJU8758 Datasheet(PDF) 5 Page - New Japan Radio |
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NJU8758 Datasheet(HTML) 5 Page - New Japan Radio |
5 / 8 page NJU3555 NJU3555 NJU8758 -5- Ver.2009-11-10 ABSOLUTE MAXIMUM RATINGS (Ta=25 °C) PARAMETER SYMBOL TERMINAL RATING UNIT Supply Voltage VDD VDDO VDD VDDO -0.3 to +7.0 -0.3 to +7.0 V V Input Voltage Vin IN, STBYb, MUTEb -0.3 to VDD + 0.3 V Operating Temperature Ta -40 to +85 °C Storage Temperature Tstg -40 to +125 °C PDMAX2 Mounted on two-layer board of based on the EIAJ, Tj = 125°C 450 mW Power Dissipation PDMAX4 Mounted on four-layer board of based on the EIAJ, Tj = 125°C 570 mW θja2 Mounted on two-layer board of based on the EIAJ, Tj = 125°C 223 °C /W Thermal Resistance θja4 Mounted on four -layer board of based on the EIAJ, Tj = 125°C 176 °C /W Note 3) All voltage are relative to “VSS= 0V” reference. Note 4) Mounted on two-layer/4-layer board of based on the EIA/JEDEC STD Note 5) The IC must be used inside of the “Absolute maximum ratings”. Otherwise, a stress may cause permanent damage to the LSI. Note 6) De-coupling capacitors for VDD-VSS and VDDO-VSS should be connected for stable operation. Note 7) The class-D amplifiers are more power efficient, and dissipate power less than general analog-amplifiers. In theory, the NJU8758 actualize quite high output-power such as 1.2W at =5V operation with 8ohms load, it looks as if the NJU8758 exceeds the absolute maximum rating of the power dissipation. However, in practice, the effective output-power of usual music sound is only about 1/10 of its maximum output power, thus it may never exceed the absolute maximum rating. The maximum power dissipation in the system is calculated, as shown below. [ ] [ ] [] W C C T C T P ja a jMAX DMAX / ° ° − ° = θ Pdmax: Maximum Power Dissipation, Tjmax: Junction Temperature = 125 °C Ta: Ambient Temperature, θja: Thermal Resistance of package (SSOP14) = 223 °C/W Power dissipation of the NJU8758 itself is calculated, as shown below. mW W C C C P D 3 . 336 / 223 50 125 = ° ° − ° = |
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