Datasheet LA4558 (Sanyo) - 5
| Manufacturer | Sanyo |
| Description | 2-Channel AF Power Amplifier. Discontinued product |
| Pages / Page | 9 / 5 — LA4558. Example of Heat Sink Mounting Method. Proper Cares in Using IC |
| File Format / Size | PDF / 329 Kb |
| Document Language | English |
LA4558. Example of Heat Sink Mounting Method. Proper Cares in Using IC
Model Line for this Datasheet
Text Version of Document
LA4558
(1) DC power supply V 2 Pd max= + Icco CC · VCC (2-channel) .. (1) (For stereo use) π2RL (2) AC power supply VCC2 : Supply voltage at quiescent mode VCC (Pd) : Supply voltage at Pd max VCC1 : Supply voltage at maximum output r : Voltage regulation VCC2 – VCC1 VCC1 Icco : Quiescent current Line regulation VCC(Pd)2 Pd max= + Icco · VCC (Pd) (For stereo use) .. (2) π2RL where (1+r) VCC1 VCC (Pd)= r · VCC1 RL 1+ √ × √ 2 · π · RL Po max
Example of Heat Sink Mounting Method
The heat sink must be of such a shape as to be able to dissipate heat from the IC plastic area and fin area and is soldered to the printed circuit board as shown below. For the size of the heat sink, refer to the Pd – Ta characteristic. The material of the heat sink is recommended to be copper or iron which is solderable. It is recommended to apply silicone grease to the IC plastic area to reduce thermal resistance between the heat sink and the IC plastic area.
Proper Cares in Using IC
1. If the IC is used in the vicinity of the maximum ratings, even a slight variation in conditions may cause the maximum ratings to be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the range where the maximum ratings are not exceeded. 2. Pin-to-pin short : If power is applied when the space between pins is shorted, breakdown or deterioration may occur. When mounting the IC on the board and applying power, make sure that the space between pins is not shorted with solder, etc. 3. Load short : If the IC is used with the load shorted for a long time, breakdown or deterioration may occur. Be sure not to short the load. 4. When the IC is used in radios or radio cassette tape recorders, keep a good distance between IC and bar antenna. 5. When making the board, refer to the sample printed circuit pattern. 6. It should be noted that some plug jacks to be used for connecting to the external speaker are such that both poles are shorted once when connecting. No.2088–5/9
(1) DC power supply V 2 Pd max= + Icco CC · VCC (2-channel) .. (1) (For stereo use) π2RL (2) AC power supply VCC2 : Supply voltage at quiescent mode VCC (Pd) : Supply voltage at Pd max VCC1 : Supply voltage at maximum output r : Voltage regulation VCC2 – VCC1 VCC1 Icco : Quiescent current Line regulation VCC(Pd)2 Pd max= + Icco · VCC (Pd) (For stereo use) .. (2) π2RL where (1+r) VCC1 VCC (Pd)= r · VCC1 RL 1+ √ × √ 2 · π · RL Po max
Example of Heat Sink Mounting Method
The heat sink must be of such a shape as to be able to dissipate heat from the IC plastic area and fin area and is soldered to the printed circuit board as shown below. For the size of the heat sink, refer to the Pd – Ta characteristic. The material of the heat sink is recommended to be copper or iron which is solderable. It is recommended to apply silicone grease to the IC plastic area to reduce thermal resistance between the heat sink and the IC plastic area.
Proper Cares in Using IC
1. If the IC is used in the vicinity of the maximum ratings, even a slight variation in conditions may cause the maximum ratings to be exceeded, thereby leading to breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the range where the maximum ratings are not exceeded. 2. Pin-to-pin short : If power is applied when the space between pins is shorted, breakdown or deterioration may occur. When mounting the IC on the board and applying power, make sure that the space between pins is not shorted with solder, etc. 3. Load short : If the IC is used with the load shorted for a long time, breakdown or deterioration may occur. Be sure not to short the load. 4. When the IC is used in radios or radio cassette tape recorders, keep a good distance between IC and bar antenna. 5. When making the board, refer to the sample printed circuit pattern. 6. It should be noted that some plug jacks to be used for connecting to the external speaker are such that both poles are shorted once when connecting. No.2088–5/9
