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EL7535 Datasheet(PDF) 8 Page - Intersil Corporation |
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EL7535 Datasheet(HTML) 8 Page - Intersil Corporation |
8 / 9 page 8 FN7003.5 July 13, 2006 point. The equation below shows the pole frequency relationship: Current Limit and Short-Circuit Protection The current limit is set at about 1.5A for the PMOS. When a short-circuit occurs in the load, the preset current limit restricts the amount of current available to the output, which causes the output voltage to drop below the preset voltage. In the meantime, the excessive current heats up the regulator until it reaches the thermal shut-down point. Thermal Shut-Down Once the junction reaches about 145°C, the regulator shuts down. Both the P channel and the N channel MOSFETs turn off. The output voltage will drop to zero. With the output MOSFETs turned off, the regulator will soon cool down. Once the junction temperature drops to about 130°C, the regulator will restart again in the same manner as EN pin connects to logic HI. Thermal Performance The EL7535 is in a fused-lead MSOP10 package. Compared with regular MSOP10 package, the fused-lead package provides lower thermal resistance. The θJA is 100°C/W on a 4-layer board and 125°C/W on 2-layer board. Maximizing the copper area around the pins will further improve the thermal performance. Layout Considerations The layout is very important for the converter to function properly. The following PC layout guidelines should be followed: • Separate the Power Ground ( ) and Signal Ground ( ); connect them only at one point right at the pins • Place the input capacitor as close to VIN and PGND pins as possible • Make the following PC traces as small as possible: - from LX pin to L - from CO to PGND • If used, connect the trace from the FB pin to R1 and R2 as close as possible • Maximize the copper area around the PGND pin • Place several via holes under the chip to additional ground plane to improve heat dissipation The demo board is a good example of layout based on this outline. Please refer to the EL7535 Application Brief. f P 1 2 π R 1 R2 ()C 4 --------------------------------------- = EL7535 |
Similar Part No. - EL7535_06 |
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Similar Description - EL7535_06 |
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