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HIP6311 Datasheet(PDF) 14 Page - Intersil Corporation |
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HIP6311 Datasheet(HTML) 14 Page - Intersil Corporation |
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14 / 17 page  14 FN4817.3 December 27, 2004 The critical small components include the bypass capacitors for VCC and PVCC on the gate driver ICs. Locate the bypass capacitor, CBP, for the HIP6311 controller close to the device. It is especially important to locate the resistors associated with the input to the amplifiers close to their respective pins, since they represent the input to feedback amplifiers. Resistor RT, that sets the oscillator frequency should also be located next to the associated pin. It is especially important to place the RSEN resistor(s) at the respective terminals of the HIP6311. A multi-layer printed circuit board is recommended. Figure 11 shows the connections of the critical components for one output channel of the converter. Note that capacitors CIN and COUT could each represent numerous physical capacitors. Dedicate one solid layer, usually the middle layer of the PC board, for a ground plane and make all critical component ground connections with vias to this layer. Dedicate another solid layer as a power plane and break this plane into smaller islands of common voltage levels. Keep the metal runs from the PHASE terminal to inductor LO1 short. The power plane should support the input power and output power nodes. Use copper filled polygons on the top and bottom circuit layers for the phase nodes. Use the remaining printed circuit layers for small signal wiring. The wiring traces from the driver IC to the MOSFET gate and source should be sized to carry at least one ampere of current. Component Selection Guidelines Output Capacitor Selection The output capacitor is selected to meet both the dynamic load requirements and the voltage ripple requirements. The load transient for the microprocessor CORE is characterized by high slew rate (di/dt) current demands. In general, multiple high quality capacitors of different size and dielectric are paralleled to meet the design constraints. Modern microprocessors produce severe transient load rates. High frequency capacitors supply the initially transient current and slow the load rate-of-change seen by the bulk capacitors. The bulk filter capacitor values are generally determined by the ESR (effective series resistance) and voltage rating requirements rather than actual capacitance requirements. High frequency decoupling capacitors should be placed as close to the power pins of the load as physically possible. Be careful not to add inductance in the circuit board wiring that could cancel the usefulness of these low inductance components. Consult with the manufacturer of the load on specific decoupling requirements. Use only specialized low-ESR capacitors intended for switching-regulator applications for the bulk capacitors. The bulk capacitor’s ESR determines the output ripple voltage and the initial voltage drop following a high slew-rate transient’s edge. In most cases, multiple capacitors of small case size perform better than a single large case capacitor. Bulk capacitor choices include aluminum electrolytic, OS- Con, Tantalum and even ceramic dielectrics. An aluminum electrolytic capacitor’s ESR value is related to the case size with lower ESR available in larger case sizes. However, the equivalent series inductance (ESL) of these capacitors increases with case size and can reduce the usefulness of the capacitor to high slew-rate transient loading. Unfortunately, ESL is not a specified parameter. Consult the capacitor manufacturer and measure the capacitor’s impedance with frequency to select a suitable component. VCORE +12V VIA CONNECTION TO GROUND PLANE ISLAND ON POWER PLANE LAYER ISLAND ON CIRCUIT PLANE LAYER LO1 COUT CIN +5VIN KEY PHASE VCC USE INDIVIDUAL METAL RUNS COMP HIP6311 PWM RT RIN RFB CBP FB VSEN ISEN RSEN HIP6601 CBOOT CBP CT VCC FS/DIS PVCC LOCATE NEXT TO IC PIN LOCATE NEXT TO FB PIN LOCATE NEXT TO IC PIN(S) ISOLATE OUTPUT STAGES FOR EACH CHANNEL TO HELP LOCATE NEAR TRANSISTOR FIGURE 11. PRINTED CIRCUIT BOARD POWER PLANES AND ISLANDS HIP6311 |
Similar Part No. - HIP6311_04 |
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Similar Description - HIP6311_04 |
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