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ADM1014 Datasheet(PDF) 12 Page - Analog Devices |
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ADM1014 Datasheet(HTML) 12 Page - Analog Devices |
12 / 12 page ADM1014 –12– REV. PrN 1/02 LAYOUT CONSIDERATIONS Any circuits supplied by the ADM1014 are outside the control loops of the main system power supplies, which means that any series resistance between the four supply inputs and the out- puts will cause a degradation of the supply load regulation. This includes connector contact resistance, PCB trace resistance, on- resistance of MOSFETs (both external and on-chip) and current sense resistors. Care must therefore be taken to ensure that: a) PCB traces are as heavy as possible. b)External MOSFETs have low-on resistance. c) Current sense resistors are as small as possible. The current sense resistors have very small values (5m in the preceding example) to minimise the voltage drop across them. Because of this, PCB trace resistance can be a significant per- centage of the sense resistance. It is therefore essential to en- sure that the ADM1014 senses the voltage drop directly across the sense resistors and not across any current-carrying trace resistance in series with them. Connections from the ADM1014 to the sense resistors must go directly to the ends of the resistors. Figure 4 shows examples of good and bad practice OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 38-Pin TSSOP (RU-38) INCORRECT 35 34 37 36 22 21 24 23 CURRENT SENSE RESISTORS VSENSE ADM1014 VSENSE CORRECT ADDITIONAL VOLTAGE DROP ADDITIONAL VOLTAGE DROP CURRENT SENSE RESISTORS VSENSE ADM1014 VSENSE ADDITIONAL VOLTAGE DROP ADDITIONAL VOLTAGE DROP 35 34 37 36 22 21 24 23 34 21 Figure 4. Good and Bad Practice For Sense Resistor Connection 38 20 19 1 0.386 (9.80) 0.378 (9.60) 0.256 (6.50) 0.246 (6.25) 0.177(4.50) 0.169(4.30) PIN 1 SEATING PLANE 0.006(0.15) 0.002(0.05) 0.0200(0.50) BSC 0.0433 (1.10) MAX 0.0106 (0.27) 0.0067 (0.17) 0.0079 (0.20) 0.0035 (0.090) 0.028 (0.70) 0.020 (0.50) 88 08 |
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