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ADP1148AR-5 데이터시트(PDF) 11 Page - Analog Devices |
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ADP1148AR-5 데이터시트(HTML) 11 Page - Analog Devices |
11 / 16 page ADP1148, ADP1148-3.3, ADP1148-5 –11– REV. A Board Layout When laying out the printed circuit board, the following check list should be used to ensure proper operation of the ADP1148. These items are also illustrated graphically in the layout diagram of Figure 18. Check the following in your layout: 1) Are the signal and power grounds segregated? The ADP1148 SIGNAL GND (Pin 11) must return to the (–) plate of COUT. The power ground returns to the source of the N-channel MOSFET, anode of the Schottky diode, and (–) plate of CIN, which should have as short lead lengths as possible. 2) Does the ADP1148 SENSE(–), (Pin 7), connect to a point close to RSENSE and the (+) plate Of COUT? In adjustable versions the resistive divider R1, R2 must be connected be- tween the (+) plate of COUT and signal ground. 3) Are the SENSE(–) and SENSE(+) leads routed together with minimum PC trace spacing? The 1000 pF capacitor between Pins 7 and 8 should be as close as possible to the ADP1148. 4) Does the (+) plate of CIN connect to the source of the P-channel MOSFET as closely as possible? This capacitor provides the ac current to the P-channel MOSFET. 5) Is the input decoupling capacitor (1 µF) connected closely between VIN (Pin 3) and POWER GND (Pin 12)? This capacitor carries the MOSFET driver peak currents. 6) Is INTVCC (Pin 5) decoupled with a 10 nF capacitor to signal ground? 7) Is the SHUTDOWN (Pin 10) actively pulled to ground during normal operation? The Shutdown pin is high imped- ance and must not be allowed to float. To prevent noise spikes from erroneously tripping the current comparator, a 1000 pF capacitor is needed across Sense(–) and Sense(+). P-DRIVE NC VIN CT INT VCC ITH SENSE(–) N-DRIVE NC POWER GND SIGNAL GND SHUTDOWN VFB SENSE(+) ADP1148 3300pF 1k D1 CIN L R1 R2 COUT 10nF CT 1 F 1 2 3 4 5 6 7 14 13 12 11 10 9 8 N-CHANNEL 1000pF R1, R2 OUTPUT DIVIDER REQUIRED FOR ADJUSTABLE VERSION ONLY. RSENSE – – VIN VOUT P-CHANNEL NC = NO CONNECT Figure 18. ADP1148 Layout Diagram (See Board Layout) |
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