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LTC1644IGN 数据表(PDF) 21 Page - Linear Technology |
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LTC1644IGN 数据表(HTML) 21 Page - Linear Technology |
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21 / 24 page  LTC1644 21 1644f APPLICATIO S I FOR ATIO that in all LTC1644 circuit schematics, zener diodes and snubber networks have been added to the 12VIN and VEEIN (–12V) supply rail and should be used always. Since the absolute maximum supply voltage of the LTC1644 is 13.2V, snubber networks are not necessary on the 3VIN or the 5VIN supply lines. Zener diodes, however, are recom- mended as these devices provide large-scale transient protection for the LTC1644 against PCI backplane fault occurrences. All protection networks should be mounted very close to the LTC1644’s supply voltage using short lead lengths to minimize lead inductance. This is shown schematically in Figures 15 and 16 and a recommended layout of the transient protection devices around the LTC1644 is shown in Figure 17. sinusoidal response whose duration and period is depen- dent on the resonant circuit parameters. Since the abso- lute maximum supply voltage of the LTC1644 is 13.2V, transient protection against 12VIN and VEEIN supply volt- age spikes and ringing is highly recommended. In these applications, there are two methods for eliminat- ing these supply voltage transients: using Zener diodes to clip the transient to a safe level and snubber networks. Snubber networks are series RC networks whose time constants are experimentally determined based on the board’s parasitic resonant circuits. As a starting point, the capacitors in these networks are chosen to be 10 × to 100× the power MOSFET’s COSS under bias. The series resistor is a value determined experimentally and ranges from 1 Ω to 50 Ω, depending on the parasitic resonant circuit. Note Figure 15. Place Transient Protection Devices Close to LTC1644’s 5VIN and 3VIN Pins C1 0.047 µF 3VIN 3VIN 3.3V 5VIN 5V 3VSENSE 17 3VOUT 18 5VIN 13 5VOUT 3 5VSENSE 14 16 GATE 15 R3 10 Ω R4 10 Ω 5VOUT 5V 3VOUT 3.3V R5 1k R1 0.005 Ω Q1 IRF7413 Q2 IRF7413 R2 0.007 Ω Z3 Z4 LTC1644* 1644 F15 GND 8 Z3, Z4: 1PMT5.0AT3 *ADDITIONAL DETAILS OMITTED FOR CLARITY Figure 16. Place Transient Protection Devices Close to LTC1644’s 12VIN and VEEIN Pins Figure 17. Recommended Layout for Transient Protection Components 12VIN 1 VEEIN 12VIN –12VIN 2 Z1 Z2 R16 1 Ω C5 0.01 µF LTC1644* 1644 F16 GND 8 Z1, Z2: SMAJ12CA *ADDITIONAL DETAILS OMITTED FOR CLARITY R15 1 Ω C4 0.01 µF VIAS TO GND PLANE C4 R13 GND 5VIN LTC1644* *ADDITIONAL DETAILS OMITTED FOR CLARITY DRAWING IS NOT TO SCALE! 1644 F17 3VIN VEEIN 12VIN Z1 Z2 Z3 Z4 C5 R14 |
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