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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC1109 датащи(PDF) 14 Page - Semtech Corporation |
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SC1109 датащи(HTML) 14 Page - Semtech Corporation |
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14 / 17 page  SYNCHRONOUS PWM CONTROLLER WITH DUAL LOW DROPOUT REGULATOR CONTROLLERS © 2000 SEMTECH CORP. PRELIMINARY - October 16, 2000 SC1109 14 TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com Vout 5V + + rents are supplied by Cout only, and connections be- tween Cout and the load must be short, wide copper areas to minimize inductance and resistance. 5) The SC1109 is best placed over a quiet ground plane area, avoid pulse currents in the Cin, Q1, Q2 loop flowing in this area. GND should be returned to the ground plane close to the package and close to the ground side of (one of) the output capacitor(s). If this is not possible, the GND pin may be connected to the ground path between the Output Capacitor(s) and the Cin, Q1, Q2 loop. Under no circumstances should GND be returned to a ground inside the Cin, Q1, Q2 loop. 6) BST for the SC1109 should be supplied from the 12V supply, the BST pin should be decoupled directly to GND by a 0.1 µF ceramic capacitor, trace lengths should be as short as possible. If a 12V supply is not available, a classical boot strap method could be im- plemented to achieve the upper Mosfet’s gate drive. 7) The Phase connection should be short . 8) Ideally, the grounds for the two LDO sections should be returned to the ground side of (one of) the output capacitor(s). Currents in various parts of the power section |
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