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ML4854 Datasheet(PDF) 11 Page - Fairchild Semiconductor |
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ML4854 Datasheet(HTML) 11 Page - Fairchild Semiconductor |
11 / 13 page ML4854 PRODUCT SPECIFICATION REV. 1.0.7 5/6/03 11 components. The PCB layout should be based on some simple rules to minimize EMI and to ensure good regulation performances: 1. Place the IC, inductor, input and output capacitor as close together as possible. 2. Keep the output capacitor as close to the ML4854 as possible with very short traces to VOUT and GND pins. Typically it should be within 0.25 inches or 6 mm. 3. Keep the traces for the power components wide, typically > 50 mils or 1.25 mm. 4. Place the external networks for LBI and FB close to ML4854, but as far away as possible from the power components to prevent voltage transient from coupling into sensitive nodes. 5. On multilayer boards, use component side copper for grounding around the IC and connect back to a quiet ground plane using vias. The ground planes act as electrostatic shields for some of the RF energy radiated. 6. The connection of the GND pin of the IC (pin 8) to the overall grounding system should be directly to the bottom of the output filter capacitor. A star grounding system radiating from where the power enters the PCB, is a recommended practice. Application Example: Using ML4854 as a constant current source to drive four LEDs: The current through the LEDs is maintained constant within a large input voltage range as shown in the diagram below: L L = 10 µH Cin = Cout = 10 µF R = 62 ohm D1...D4 = QTLP 600C-EB (blue) D1 ML4854 1 2 3 4 8 7 6 5 R D2 Cout Cin + + + R D3 R D4 R 20 ML4854 feeds LED QTLP 600C-EB Input Voltage (V) 19.8 19.6 19.4 19.2 19 18.8 18.6 18.4 18.2 18 012 3 4 5 |
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