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NDM2Z-12HT-AA Datasheet(PDF) 8 Page - CUI INC |
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NDM2Z-12HT-AA Datasheet(HTML) 8 Page - CUI INC |
8 / 14 page cui.com date 11/07/2014 │ page 8 of 14 CUI Inc │ MODEL: NDM2Z-12H │ DESCRIPTION: AUTO COMPENSATED, DIGITAL DC-DC POL CONVERTER OPERATING INFORMATION The NDM2Z-12 modules are available in different configurations; not all pins and functions are supported by each configuration. This document describes all pins and functions. The Novum Z Products PMBus Commands application note defines the available PMBus™ commands. REQUIRED CONFIGURATIONS NDM2Z-12 Module Pins Each NDM2Z-12 module should have a resistor placed between VSET and PREF to set the output voltage of the module. The maximum output voltage which can be configured by PMBus commands can never exceed 110% of the voltage set by the VSET pin. The SMBus address of each module is set by either pin-strap configuration or resis- tor value associated with the SA0 pin. More information regarding setting the SMBus address for a module can be found in the section titled “SMBus”. PCB Layout Good performance of any point of load voltage regulator module can only be achieved with careful PCB layout considerations. Ground planes or very wide traces should be used for power and ground routing. Input capacitors should be placed close to the input voltage pins of the module and output capacitors should be placed close to the load. The module should also be placed as close as possible to the load. INPUT AND OUTPUT CAPACITORS Input Capacitors Input capacitors are recommended to be used with the NDM2Z-12 module in order to minimize input voltage ripple. A 330 μF POSCAP or electrolytic and 3x 22 μF ceramic capacitors should be placed as close as possible to the input pins of the module. Additional input capacitors may be used if less input voltage ripple is desired. Output Capacitors Output capacitors are recommended to be used with the NDM2Z-12 module in order to improve transient response and minimize output voltage ripple. A 330 μF POSCAP or electrolytic and 3x 22 μF ceramic capacitors should be placed as close as possible to the load. Additional output capacitors may be used to further improve the output voltage characteristics. POWER CONVERSION AND MANAGEMENT Power Conversion Overview The NDM2Z-12 module has several features to enable high power conversion efficiency. Non-linear loop response (NLR) improves the response time and reduces the output deviation as a result of load transients. The incorporation of DFM enhances the performance of CUI modules over that available from conventional analog POL offerings. Power Management Overview The NDM2Z-12 module incorporates a wide range of power management features. All power management functions can be configured via the SMBus interface. The NDM2Z-12 can monitor and report many characteristics of the module including input voltage, output voltage, output current and internal temperature. Additionally, the NDM2Z-12 includes circuit protection features that protect the module and load from damage due to system faults. Monitoring parameters can also be configured to provide alerts for specific conditions. The ability of CUI modules to digitally control, configure and monitor OS features provides significant benefits over traditional analog POL products. CONFIGURING THE MODULE Pin Settings Pin SA0 is used to set the SMBus address of the NDM2Z-12 module. Details of this feature are discussed in the section titled “SMBus”. Pin SYNC is used to synchronize the switch- ing clock of the module to an external clock source. More information regarding synchronization can be found in the section titled “SWITCHING FREQUENCY AND SYNCHRONI- ZATION”. Pin VSET is used to configure the output voltage of the module. The voltage established by the VSET pin limits the maximum output voltage that can be configured by SMBus commands. The SA0, SYNC and VSET pin configurations are read by the module when power is applied or whenever a SMBus RESTORE command is issued. The CTRL pin is active high and can be used to enable the module. Internal connections on the module will drive the CTRL pin high if it is left floating. Pins +S and -S are used for remote voltage sensing of the output voltage. For more information, please visit the product page. |
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