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LM391N-100 Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LM391N-100 Datasheet(HTML) 9 Page - National Semiconductor (TI) |
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9 / 12 page  Application Hints (Continued) Since the free air thermal resistance of the MJE711 MJE721 is 100 CW no heat sink is required Using this information and equation (6) we can find the minimum value of RE required to prevent thermal runaway RE t 100 (30) (0002) 30 a 1 e 019X (6) We must now use the SOA data on the TIP42 TIP41 tran- sistors to set up the protection circuit Below is the SOA curve with the 4X and 8X load lines Also shown are the desired protection lines Note the value of VB is equal to the supply voltage so we use the formulas in the table DC SOA of TIP42 TIP41 Transistors TLH7146 – 8 The data points from the curve are VM e 60V VB e 23V IL e 3A IL e 7A Using the dual slope protection formulas RE e 065 3 e 022X R2 e 1k R1 e 1k 60b065 065 J 91k R3 e 1k 23 7(022) b 065 b 1 J 24k Note that an RE of 022X satisfies equation (6) The final schematic of this amplifier is below If the output is shorted the current will be 18A and VCE is 23V Since the input is AC the average power is short PD e (18) (23) 21W This power is greater than was used in the heat sink calcula- tions so the transistors will overheat for long-duration shorts unless a larger heat sink is used Typical Applications (Continued) 20W-8X 30W-4X Amplifier with 1 Second Turn-ON Delay TLH7146 – 9 Additional protection for LM391N Schottky diodes and R j 100X 9 |
Número de pieza similar - LM391N-100 |
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Descripción similar - LM391N-100 |
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