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ZXRD1033PQ16 Datasheet(PDF) 10 Page - Diodes Incorporated |
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ZXRD1033PQ16 Datasheet(HTML) 10 Page - Diodes Incorporated |
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10 / 28 page  10 Optimising for Transient Response. Transient response is important in applications where the load current increases and decreases rapidly. To optimise the system for good transient response certain criteria have to be observed. The optimum solution using the ZXRD series uses the adjustable N phase controller in synchronous mode as represented in the diagram opposite. The external networks for this solution require the use of the adjustable controller option. By using standard ’bulk’ capacitors in parallel with a single OS-CON capacitor significant performance versus cost advantage can be given in this application. The low ESR of the OS-CON capacitor provides competitive output voltage ripple at low capacitance values. The ’bulk’ capacitors aid transient response. However, the low ESR of the OS-CON capacitor can cause instability within the system. To maintain stability an RC network (RX, Cx1 ) ha s t o be implemented. Furthermore, a capacitor in parallel with R6 (Cx2) is required to optimise transient response. To do this the appropriate adjustable ZXRD must be used because the input to the internal error amplifier (pin 16) has to be accessed. The adjustable device differs from fixed controller versions in this respect. This combined with a frequency compensation adjustment gives an optimised solution for excellent transient response. Layout Issues Layout is critical for the circuit to function in the most efficient manner in terms of electrical efficiency, thermal considerations and noise. The following guidelines should be observed: A 2.2 µF (C8) decoupling capacitor should be as close as possible to the drive MOSFETs and D1 anode. This capacitor is effectively connected across VIN and GND but should be as close as possible to the appropriate components in either N or P, synchronous or non-synchronous configurations. Furthermore the GND connection of the synchronous MOSFET/D1 and output capacitors should be close together and use either a ground plane or at the very least a low inductance PCB track. For the standard application circuits, a Gerber file can be made available for the layout which uses the materials as listed in the bill of materials table for the reference designs. Reference Designs. In the following section reference circuits are shown for t he ZX RD se ries in both s ync hronous and non-synchronous modes. These are shown for each of the N and P phase controllers. In each case efficiency graphs are shown for the appropriate configuration using 3.3V and 5V ZXRD devices. The BOM is then shown for the design. Additional and alternative components are shown with a ’*’. These refer to modifications to the design to optimise for transient response. Optimisation is reached using the adjustable version of either N or P phase controller device. ISSUE 4 - OCTOBER 2000 ZXRD1000 SERIES |
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