USERS MANUAL ZL2106EVAL1Z AN1468 Rev 2.00 Evaluation Board Sep 15, 2011 Description Specifications The ZL2106 is an innovative power conversion and This board has been optimized as a buck regulator for the following operating conditions: management IC that combines an integrated synchronous step-down DC-DC converter with key power and fault V = 12V IN management functions in a small package, resulting in a V = 3.3V OUT flexible and integrated solution. The ZL2106EVAL1Z platform I = 6A (with airflow) MAX allows evaluation of the features in the highly configurable 2 f = 400kHz ZL2106 in either stand-alone mode or via an I C/SMBus SW interface. Peak Efficiency: >85% at 50% Load A USB-to-SMBus reference board can be used to connect the Output Ripple: <0.5% at 6A ZL2106EVAL1Z board to a PC. The PMBus command set is Dynamic Response: 3.5% accessed by using the PowerNavigator evaluation software (3A to 5A and 5A to 3A Steps, di/dt = 2.5A/s) from a PC running Microsoft Windows. Board Temperature: +25C Key Features Ordering Information Small, compact design PART NUMBER DESCRIPTION PMBuscontrol ZL2106EVAL1Z ZL2106 Evaluation board only, one channel Pin-strap selection for stand-alone operation V settable from 0.6V to 5V OUT Convenient power connection On-board enable switch Power-good indicator POWER IN SW1 EN POWER OUT ZL2106 VTRK J13 J12 SYNC SYNC SM BUS SM BUS 3 TRACK INPUT PG FIGURE 1. ZL2106EVAL1Z BLOCK DIAGRAM AN1468 Rev 2.00 Page 1 of 19 Sep 15, 2011ZL2106EVAL1Z Functional Description Board Operation The ZL2106EVAL1Z provides all circuitry required to demonstrate Stand-Alone Operation the features of the ZL2106. The ZL2106EVAL1Z has a The ZL2106 is easy to setup and operate. It is configured, out of functionality-optimized ZL2106 circuit layout that allows efficient the box, to provide 3.3V at 6A from a 12V source. All input and operation up to the maximum output current. Power and load output connections should to be made before turning on the connections are provided through plug-in sockets. input power supply. Standalone operation is achieved using the pin-strap settings. When the input power supply is turned on, the ZL2106 will output The pin-strap setting details are described in the ZL2106 data the configured voltage and the load applied to V /V can OUT+ OUT- sheet FN6852. be varied. The ZL2106 Evaluation Board is shown in Figure 2. The SMBus To modify the pin-strap setting of the ZL2106, input power must address is selectable through jumpers on the top side of the 2 be turned off. The user adjustable pin-strap resistor pads are on board. All power to the board (V and I C/SMBus bus) must be IN the bottom side of the ZL2106EVAL1Z PCB. Once the desired removed before changing the jumpers. The back side of the pin-strap settings and component changes have been applied, board has 0402 resistor footprints for setting the configuration power can be turned on and the output can be evaluated for the pins using resistors. newly configured mode. Refer to the ZL2106 data sheet FN6852 The hardware enable function is controlled by a toggle switch on for pin-strap and resistor setting information. Refer to Figure 2 the ZL2106EVAL1Z board. The Power-Good (PG) LED is powered for resistor pad locations. 2 from the I C/SMBus source it indicates the correct state of PG when external power is applied to the ZL2106EVAL1Z board. The PMBus Operation right angle headers at opposite ends of the board are for 2 The ZL2106 utilizes the PMBus protocol. The PMBus functionality connecting a USB to I C/SMBus control board or for daisy can be controlled via USB from a PC running the PowerNavigator chaining of multiple evaluation boards. Figure 3 shows the evaluation software in a Windows XP or Windows 2000/NT ZL2106 application circuit. The circuit consists of the ZL2106 operating system. power conversion and management IC with its minimal component count to realize a buck converter. The board layout Install the ZL2106EVAL1Z software using the CD included in the has been optimized for thermal performance. ZL2106EVAL1Z kit. Figure 4 shows the interface connections. Figure 5 illustrates the For PMBus operation, connect another Zilker Labs evaluation input and output power connections. The optional input board, such as the ZL2006EV2 or the USB-to-SMBus reference capacitors and output capacitors are also shown in Table 1, board, to J12 of the ZL2106EVAL1Z board. Connect the desired which lists the complete bill of materials and is a recommended load and an appropriate power supply to the input. Place the component list for the ZL2106. ENABLE switch in DISABLE and turn on the power. The PCB has four layers and the layout for each layer is shown in The PowerNavigator evaluation software allows modification of Figure 6 to Figure 11. This is a recommended example layout for all ZL2106 PMBus parameters. Refer to Zilker Labs application for PMBus command details. Use the mouse-over the ZL2106. note AN2033 pop-ups for PowerNavigator help. Manually configure the ZL2106 through PowerNavigator or load a predefined scenario from a Operating Range configuration file. By default, the ZL2106EVAL1Z is configured for the operating The ENABLE switch can then be moved to ENABLE and the conditions shown on page 1 using the bill of materials listed in ZL2106 can be tested. Alternately, the PMBus ON-OFF CONFIG Table 1 on page 8. The board can also support a wider operating and OPERATION commands may be used. range, and modifying the operating conditions will change the performance results. Loop Compensation Settings The default board V range is 0.54V to 5.5V including margin. OUT These PID settings are included in the configuration file that is The output voltage can be changed by using the VSET resistor stored on the ZL2106 Evaluation Board, and is shown in Default range is 0A pad or by using a PMBus command. The board I OUT Configuration Text on page 18 for reference. CompZL can be to 6A. used to generate appropriate PID settings for other circuit The board schematic in Figure 3 includes resistor population configurations. options for these connections. The default switching frequency (f ) is 400kHz. The f range SW SW References is 200kHz to 1MHz. The PWM loop must maintain stability at the 1. ZL2106 Data Sheet, 6A Digital-DC Synchronous Step-Down selected switching frequency, so the loop compensation PID DC-DC Converter, File No. FN6852. settings may need to be modified when f is changed. SW CompZL can be used to generate PID settings for different 2. Zilker Labs PMBus Command Set - DDC Products, AN2033 switching frequencies. AN1468 Rev 2.00 Page 2 of 19 Sep 15, 2011