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CS5155GD16 数据表(PDF) 13 Page - Cherry Semiconductor Corporation |
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CS5155GD16 数据表(HTML) 13 Page - Cherry Semiconductor Corporation |
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13 / 14 page  Applications Information: continued 13 4. Connect the ground terminals of the Compensation capacitor directly to the ground of the fast feedback filter capacitor to prevent common mode noise from effecting the PWM comparator. 5. Place the output filter capacitor(s) as close to the load as possible and connect the ground terminal to pin 14 (LGnd). 6. To implement adaptive voltage positioning, connect both slow and fast feedback pins 16 (VFB) and 8 (VFFB) to the regulator output right at the inductor terminal. Connect inductor to the output capacitors via a trace with the fol- lowing resistance: RTRACE = This causes the output voltage to be +40mV with no load, and -40mV with a full load, improving regulator transient response. This trace must be wide enough to carry the full output current. (Typical trace is 1.0 inch long, 0.17 inch wide). Care should be taken to minimize any additional losses after the feedback connection point to maximize reg- ulation. 7. If DC regulation is to be optimized (at the expense of degraded transient regulation), adaptive voltage position- ing can be disabled by connecting to VFB pin directly to the load with a separate trace (remote sense). 8. Place 5V input capacitors close to the switching MOSFET and synchronous MOSFET. Route gate drive signals VGATE(H) (pin 10) and VGATE(L) (pin 12 when used) with traces that are a minimum of 0.025 inches wide. Figure 20: Layout Guidelines 15 To the negative terminal of the input capacitors 100pF VFFB 11 8 OFF TIME 5 SOFTSTART VCC 0.1 mF To the negative terminal of the output capacitors 1.0 mF VCOMP 80mV IMAX Figure 21: 5V to 3.3V/10A converter. Figure 22: 5V to 3.3V/10A converter with current sharing. Figure 23: 3.3V to 2.5V/7A converter with 12V bias. 0.33 mF VID0 VID1 VID2 VID3 VCC1 CS5155 COFF VFB VFFB COMP Si9410 Si9410 12V + + 5 mH 2.5V/7A VCC2 PGnd 3.3k 0.1 mF 100 mF/10V x 2 Tantalum 100pF 330pF 1 mF 33 mF/25V x 3 Tantalum 3.3V SS LGnd VGATE(H) VGATE(L) VID4 0.33 mF VID0 VID1 VID2 VID3 VCC1 CS5155 COFF VFB VFFB COMP Si9410 Si4410 1 mF 5V + + 3 mH 3.3V/10A VCC2 PGnd 3.3k 0.1 mF 100 mF/10V x 3 Tantalum 100pF 330pF 0.1 mF 1 mF MBRS120 MBRS120 100 mF/10V x 3 Tantalum 10 W Remote Sense Connect to other circuits for current sharing SS LGnd VGATE(H) VGATE(L) VID4 MBRS 120 0.33 mF VID0 VID1 VID2 VID3 VCC1 CS5155 COFF VFB VFFB COMP Si9410DY Si4410DY 1 mF 5V + + 3 mH 3.3V/10A VCC2 PGnd 3.3k 0.1 mF 100 mF/10V x 3 Tantalum 100pF 330pF 0.1 mF 1 mF MBRS120 MBRS120 100 mF/10V x 3 Tantalum SS LGnd VGATE(H) VGATE(L) VID4 MBRS 120 Additional Application Circuits |
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