UG-106 Rev 1.0, 16-November-2017

Transcription

1 ACT490EVK- User s Guide UG-06 Description This document describes the characteristic and operation of the Active Semi ACT490EVK- evaluation kit (EVK). It provides setup and operation instructions, schematic, layout, BOM, and test data. This EVK demonstrates the ACT490QW efuse power management IC. Other ACT490QWxxx options can be evaluated on this EVK by replacing the IC and any other necessary components. Features The EVK can be used as a standalone board if desired. However, to access the internal registers and to take full advantage of the IC s capability, the user must connect the EVK kit to a PC with Active Semi s USB-TO-IC interface dongle and use the GUI software. The EVK provides full access to the each converter s input and output voltage, as well as all the digital control signals. This gives the user the flexibility to configure the EVK to match their real world system. Note that the ACT490EVK- is specifically configured for the ACT490QW IC. Figure EVK Picture

2 Setup Required Equipment ACT490 EVK USB-TO-IC Dongle Power supply 4A for full power operation Oscilloscope >00MHz, > channels Loads Electronic or resistive. 4A minimum current capability. Digital Multimeters (DMM) Windows compatible computer with spare USB port. UG-06 EVK Setup Figure EVK Setup

3 Hardware Setup UG-06. If using IC, ensure that a shorting jumper is placed across J6 to provide a pullup voltage.. Connect a lab supply to J. 3. Connect an appropriate load to J. GUI Setup (optional). Refer to the end of this document for detailed instructions to install the ACT490 GUI.. Connect the USB-TO-IC dongle to the computer via a USB cable. 3. Connect the USB-TO-IC dongle to the EVK J4 connector. Refer to Figure 3 to ensure the correct polarity of the connection. As a guide, use the Active-Semi logo on the top of the dongle so the black wire is connected toward the lower left corner of the Dongle. Figure 3 USB-TO-IC Dongle Connection EVK Design Parameters The ACT490EVK- is designed for a V input voltage. The maximum operating voltage is determined by the IC s maximum input voltage rating. The minimum operating voltages are determined by the buck converters minimum input voltage and by the LDOs dropout voltages. Maximum currents are determined by the IC s CMI settings, which can be changed via IC after startup. Table. EVK Design Parameters Parameter Description Min Typ Max Unit VIN efuse input voltage V IOUT Load current.5 A ICL efuse current limit 3.5 A VSTR Storage voltage 8 V EN_UV Input voltage falling threshold to start supplement mode 0 VBuck Buck output voltage in supplement mode 0.7 Tsoftstart Softstart time 0 ms Tholdup Supplement mode holdup time 3 ms 3

4 UG-06 Jumpers and Connectors J Input voltage to the EVK. J Output power from the EVK. This is the system load. J3 Additional storage capacitor connector. This connector allows additional storage capacitors to be easily added for evaluation J4 IC connector. Connect to the Active Semi USB-TO-GPIO dongle or to any other IC communication device. J5 PLI output. This allows easy access the PLI or PG_STR pin. J6 IC pullup voltage source. Place a shorting jumper across J6 to pullup the IC lines to the IC REF voltage. An external voltage may be applied to J6- if desired. J7 efuse Rdson measurement. This connector provides easy to access Kelvin connections to measure the efuse Rdson. Do not use J7 to apply power to the EVK or as an output connector for the load. EVK Operation Turn on The EVK is preconfigured and ready to use. Apply the V input voltage and the EVK automatically powers, charges the storage capacitors, and delivers power to the load. No modifications are needed to start evaluating the ACT490 s many functions such as supplement mode, ADC measurements, current limiting, etc. Modifications The EVK is designed to allow the user to immediately start evaluating the ACT490 functionality. After the user becomes familiar with the EVK functionality and has verified that they can reproduce the performance data, they can easily modify the EVK to match their specific system level requirements. Refer to the ACT490 datasheet for detailed design equations. PLI vs PG_STR Functionality The ACT490 default setting for pin is for the PLI functionality. If the user changes this functionality to the PG_STR function, populate R8 with a.kohm resistor to enable LED to turn on when PG_STR goes low. Input Snubber The EVK contains a non-populated input snubber. If testing with long, inductive cables, populating the snubber with the appropriate values will reduce overshoot when the input is hot plugged. nf and 0Ω are good starting points. 4

5 Test Results UG-06 5

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8 UG-06 8 Schematic Figure 4 ACT490EVK- Schematic J VIN L.μH μf C6 J5 PG_STR R.5K TP R 9K 0.μF C TP5 R3 360K R7 0K 00pF C3 6.8nF C J Vout 47nF C4 J3 STR μf C5 0.μF C7 TP3 μf C9 R4 4K μf C0 R5 75K R6 K 0.μF C TP TP4 TP6 J6 VIO_IN REF R8.K R 0K R0.K R9.K LED C8 μf nirq REF SCL SDA TP7 TP8 REF 3 4 J4 comp SCL SDA nirq HSB PG_STR P 3 BSET 4 REF 5 COMP 6 FB 7 VSS 8 SCL 9 SDA 0 VOUT VOUT VOUT 3 nirq 4 ISET 5 SS 6 EN 7 VIN 8 VIN 9 VIN 0 VIN VIN VOUT 3 VOUT 4 VOUT 5 STR 6 SW 7 P 8 U ACT490/ TP9 J7 Vsense+ Vsence- μf C4 μf C3 nf C DNP R DNP 0Ω C5 C6 C C C3 C4 C5 C0 C9 C8 C7 C6 STR

9 Layout UG-06 Figure 5 Layout Top Layer Figure 6 Layout Bottom Layer 9

10 UG-06 Figure 7 Layout Power Figure 8 Layout 0

11 Bill of Materials UG-06 Item Ref Des QTY Description Package MFR Part Number C Cap, Ceramic, 0.uF, 50V, 0%, X7R 603 Std Std C Cap, Ceramic, nf, 50V, 0%, X7R 603 Std Std 3 C3, C4,C5,C6 4 Cap, Ceramic, uf, 6V, 0%, X7R 06 Std Std 4 C7 Cap, Ceramic, 0.uF, 50V, 0%, X7R 603 Std Std 5 C8,C9 Cap, Ceramic, uf, 50V, 0%, X7R 06 Std Std 6 C0 Cap, Ceramic, uf, 6V, 0%, X7R 603 Std Std 7 C Cap, Ceramic, 00nF, 6V, 0%, X7R 603 Std Std 8 C Cap, Ceramic, 6.8nF, 6V, 0%, X7R 603 Std Std 9 C3 Cap, Ceramic, 47pF, 6V, 0%, X7R 603 Std Std 0 C4 Cap, Ceramic, 47nF, 5V, 0%, X7R 603 Std Std C5,C6,C7,C8,C9,C0,C, C,C3,C4,C5,C6 L Cap, Ceramic, 47uF, 35V, 0%, X7R D7343 Kemet 605S70CB Inductor,.uH, 6A, mohm, SMD Flat Wire High Current 4.x4.x3.mm Wurth Elektronik LED LED, Bright Green 603 Wurth Elektronik 50060VS R Res,9kΩ, % 603 Std Std 5 R Res,.5kΩ, % 603 Std Std 6 R3 Res, 360kΩ, % 603 Std Std 7 R4 Res, 4kΩ, % 603 Std Std 8 R5 Res, 75kΩ, % 603 Std Std 9 R6 Res, kω, % 603 Std Std 0 R7 Res, 0kΩ, 5% 603 Std Std R8,R9,R0 3 Res,.KΩ, 5%, 603 Std Std R Res, 0KΩ, 5% 603 Std Std 3 R Res, 0Ω, 5% 603 Std Std Header, Series 3 5mm 4 J,J,J3 3 horizontal entry 5mm Wurth Elektronik J4 Header, 4 pin, 00mil Wurth Elektronik J5,J6 Header, pin, 00mil Wurth Elektronik TP, TP3,TP5 3 8 TP,TP4,TP6,TP7,TP8 5 Test Point, Red, Through Hole, mm 0.040" Keystone 5000 Test Point, Black, Through Hole, mm 0.040" Keystone U ACT490QM QFN8 Active semi

12 GUI Installation UG-06. Contact Active Semi for the GUI files and save them on your computer.. Plug the USB-TO-IC dongle into a free USB port. 3. Follow the instructions in the How to install driver for dongle folder. Figure 9 Dongle Driver 4. Double click on the ACT490 GUI.exe to start the ACT490 GUI.

13 GUI Overview UG-06 The GUI has basic function buttons allocated in top-left of the Tool Bar which are Read and Write IC. The GUI contains setting modes: Basic Mode and Advanced Mode. In Basic Mode screen it displays basic user programmable configuration options are programmed using the drop-down boxes or check boxes. Advanced Mode contain the button text for changing setting for every single bit. Basic Mode The following figure show the GUI in basic mode. This mode allows the user to easily change one or more IC settings. Read Icon Write Icon Figure 0 GUI Basic Mode 3

14 UG-06 Advanced Mode Click the Advanced Mode button in the left of the GUI screen to see all available user programmable options. With Advanced Mode, additional user programmable features can be selected using the button text. In the left side of the Advanced Mode Screen, click on the Tiles Selector to display the register to view or change. Then change a register one bit at a time by clicking on the desired bit. The value of the bit is display right next to the bit-name button. Note that the far right side of the screen contains a scroll down button to scroll down to additional registers since the Tile Screen can only display up to 8 bytes at once. Figure GUI Advanced Mode Button Descriptions Read: Clicking on this button reads the ACT490 registers and displays them in the GUI. Note that this reads all registers. Active-Semi recommends reading registers each time the ACT490 powers-up to acquire the initial register settings. Active-semi also recommends reading registers after making changes to them. Immediately reading the registers after a write confirms the changes were properly stored. This also updates the SYSTEM STATUS box to ensure that one of the changes did not generate a fault condition. Figure Read Button 4

15 UG-06 Write: Clicking on this button writes the GUI settings to the ACT490 s registers. All registers are written, regardless of whether or not they were changed. Figure 3 Write Button 5