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ISL6532BCR Datasheet(PDF) 10 Page - Renesas Technology Corp |
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ISL6532BCR Datasheet(HTML) 10 Page - Renesas Technology Corp |
10 / 15 page ISL6532B FN9120 Rev 3.00 Page 10 of 15 Jul 2004 parasitic inductance in the switched current path generates a large voltage spike during the switching interval. Careful component selection, tight layout of the critical components, and short, wide traces minimizes the magnitude of voltage spikes. There are two sets of critical components in the ISL6532B switching converter. The switching components are the most critical because they switch large amounts of energy, and therefore tend to generate large amounts of noise. Next are the small signal components which connect to sensitive nodes or supply critical bypass current and signal coupling. A multi-layer printed circuit board is recommended. Figure 4 shows the connections of the critical components in the converter. Note that capacitors CIN and COUT could each represent numerous physical capacitors. Dedicate one solid layer, usually a 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 terminals to the output inductor 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 GATE pins to the MOSFET gates should be kept short and wide enough to easily handle the 1A of drive current. In order to dissipate heat generated by the internal VTT LDO, the ground pad, pin 21, should be connected to the internal ground plane through at least four vias. This allows the heat to move away from the IC and also ties the pad to the ground plane through a low impedance path. The switching components should be placed close to the ISL6532B first. Minimize the length of the connections between the input capacitors, CIN, and the power switches by placing them nearby. Position both the ceramic and bulk input capacitors as close to the upper MOSFET drain as possible. Position the output inductor and output capacitors between the upper and lower MOSFETs and the load. The critical small signal components include any bypass capacitors, feedback components, and compensation components. Place the PWM converter compensation components close to the FB and COMP pins. The feedback resistors should be located as close as possible to the FB pin with vias tied straight to the ground plane as required. Feedback Compensation - PWM Buck Converter Figure 5 highlights the voltage-mode control loop for a synchronous-rectified buck converter. The output voltage (VOUT) is regulated to the Reference voltage level. The error amplifier output (VE/A) is compared with the oscillator (OSC) triangular wave to provide a pulse-width modulated (PWM) wave with an amplitude of VIN at the PHASE node. The PWM wave is smoothed by the output filter (LO and CO). The modulator transfer function is the small-signal transfer function of VOUT/VE/A. This function is dominated by a DC Gain and the output filter (LO and CO), with a double pole break frequency at FLC and a zero at FESR. The DC Gain of the modulator is simply the input voltage (VIN) divided by the peak-to-peak oscillator voltage VOSC. Modulator Break Frequency Equations The compensation network consists of the error amplifier (internal to the ISL6532B) and the impedance networks ZIN and ZFB. The goal of the compensation network is to provide a closed loop transfer function with the highest 0dB crossing frequency (f0dB) and adequate phase margin. Phase margin is the difference between the closed loop phase at f0dB and 180 degrees. The equations below relate the compensation network’s poles, zeros and gain to the components (R1, R2, R3, C1, C2, and C3) in Figure 5. Use these guidelines for locating the poles and zeros of the compensation network: VDDQ 5VSBY ISLAND ON POWER PLANE LAYER ISLAND ON CIRCUIT PLANE LAYER LOUT COUT1 CIN VIN_DDR KEY COMP ISL6532B UGATE R4 R2 CBP FB GND 5VSBY FIGURE 4. PRINTED CIRCUIT BOARD POWER PLANES AND ISLANDS R1 C2 VIA CONNECTION TO GROUND PLANE Q1 R3 C3 C1 Q2 12VATX CBP GND P12V LGATE P5VSBY VDDQ(2) VTT(2) COUT2 VDDQ VTT NCH GND PAD FLC 1 2 x LO x CO ------------------------------------------- = FESR 1 2 x ESR x CO -------------------------------------------- = |
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Similar Description - ISL6532BCR |
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