STK400-290 Sanyo Semiconductor Corporation, STK400-290 Datasheet - Page 8

• Manufacturer Part Number: STK400-290
• Description: af Power Amplifier (50W+50W+50W)
• Manufacturer: Sanyo Semiconductor Corporation

The STK400-290 has six power transistors, so the thermal resistance per transistor j-c is 1.7°C / W. With an assured
ambient temperature Ta of 50°C, the required radiator thermal resistance c-a would be:
To satisfy both, 1.12°C/W is the required radiator thermal resistance.
Figure 2 illustrates Pd - P
To satisfy both, 0.98°C / W is the required radiator thermal resistance. This design example is based on a fixed voltage
supply, and will require verification within your specific set environment.
From expression (1)'
From expression (2)'
Pd = 76 W (1/10 P
From expression (1)'
From expression (2)'
O
O
max = during 5 W)
when the V
c-a < (125–50)/66.5
c-a < (150–50)/66.5 – 1.7/6
c-a < (125–50)/76
c-a < (150-50)/76-1.7/6
< 1.12
< 1.22
< 0.98
< 1.03
CC
of STK400-290 is ±26 V and R
STK400-290
L
is functioning at 3 Ω.
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