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ADM1052 Datasheet(PDF) 7 Page - Analog Devices |
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ADM1052 Datasheet(HTML) 7 Page - Analog Devices |
7 / 8 page REV. A ADM1052 –7– APPLICATIONS INFORMATION PCB LAYOUT For optimum voltage regulation, the loads should be placed as close as possible to the source of the output MOSFETs and feedback to the sense inputs should be taken from a point as close to the loads as possible. The PCB tracks from the loads back to the sense inputs should be separate from the output tracks and not carry any load current. Similarly, the ground connection to the ADM1052 should be made as close as possible to the ground of the loads, and the ground track from the loads to the ADM1052 should not carry load current. Correct and incorrect layout practice is illustrated in Figure 3. 12V SUPPLY VREF TURN-ON THRESHOLD POR THRESHOLD 6V – 9V GATE DRIVE TO EXTERNAL MOSFET MOSFET GATE THRESHOLD 3.3V SUPPLY TO EXTERNAL MOSFET DRAIN CHANNEL 1 OR CHANNEL 2 OUTPUT VOLTAGE NORMAL OUTPUT VOLTAGE FAULT REMOVED OUTPUT < 0.8 VREG CHANNEL 1 OR CHANNEL 2 OUTPUT CURRENT HICCUP MODE HOLD-OFF TIME 2 AMPS DEVICE ENTERS HICCUP MODE FAULT CURRENT 1:40 DUTY CYCLE OFF ON Figure 2. Power-On Reset and Hiccup Mode LOAD 1 LOAD 2 VIN 3.3V FORCE 1 FORCE 2 SENSE 1 SENSE 2 GND VCC 12V VOUT1 VOUT2 I1 I2 LOAD 1 LOAD 2 VIN 3.3V FORCE 1 FORCE 2 SENSE 1 SENSE 2 GND VCC 12V VOUT1 VOUT2 I1 + I2 VOLTAGE DROP IN GROUND LEAD VOLTAGE DROP BETWEEN OUTPUT AND LOAD I1 I2 CORRECT INCORRECT Figure 3. Correct and Incorrect Layout Practice |
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