OPENLPPOL-EVB

Open-Loop POL-EVB O PEN - L O O P POL E VALUATION B OA RD U SER ’ S G UIDE 1. Kit Contents The Open Loop Point of Load (POL) Evaluation Board contains the following items:  Open-Loop Evaluation Board featuring: Si8234 ISOdriver AC Current Sensor Si8540 DC Current Sensor Si8512 1.1. Hardware Overview The Open Loop POL Evaluation Board implements a single-phase POL (an architecture similar to that found in switch-mode power supplies, motor control, inverters, and ballast lighting) whose switching frequency can be varied from 100 to 500 kHz. Its duty cycle can be varied from 20 percent to 80 percent. Figure 1 illustrates a highlevel schematic overview. This variability provides a convenient means to fully evaluate the various products featured on the board. The Open Loop POL evaluation board shown in Figure 2 uses Silicon Laboratories’ Si8234 ISOdriver to drive the high-side and low-side FETs. It uses two Si8512 ac current sensors to monitor the switching currents in the high-side and low-side FETs respectively. The board also uses the Si8540 dc current sensor to monitor the dc current being delivered to the load. Refer to the Si85xx, Si823x, and Si854x family data sheets for more information concerning their operation. +12 V Si8512 High Side AC Current Sensor HS FET PWM Source Si8540 DC Current Sensor Si8234 ISODriver LS FET Si8512 Low Side AC Current Sensor Figure 1. Open Loop POL High-Level Schematic Rev. 0.3 9/10 Copyright © 2010 by Silicon Laboratories Open-Loop POL-EVB Open-Loop POL-EVB Figure 2. Open Loop POL Evaluation Board 2. Required Equipment The following equipment is required:            2 1 digital multi-meter 2 multi-meter test leads (black and red) 1 oscilloscope (Tektronix TDS 2024B or equivalent) 1 BNC splitter 5 BNC cables 1 dc power supply (HP6024A, 15 V dc, 0–5 A or equivalent) 2 banana to banana wires (black and red) 1 electronic load simulator (Kikusui PLZ164WA or equivalent) 1 Agilent 33220A 20 MHz function/arbitrary wave generator or equivalent Open-Loop POL Evaluation Board (board under test) Open-Loop POL Evaluation Board User’s Guide (this document) Rev. 0.3 Open-Loop POL-EVB 3. Hardware Overview and Demo The POL evaluation board is designed to provide a nominal 6.0 V output with a 250 kHz, 50 percent duty cycle input (this assumes a 12 V input voltage on J3 VIN). It is not recommended that the electronic load exceed 10 A of output current. The safest operating range for the E-Load is up to 5 A. This test tests the basic function of the Open Loop POL board. 3.1. Board Jumper Settings 1. See Figure 1. 2. Ensure that J2, J5, and J7 are black and that J1, J3, J4, and J6 are red. 3. Ensure that the shunts are installed on JP5 and pins 2 and 3 of JP6. 4. Ensure that no shunt is installed on JP4. 3.2. DC Supply Configuration 1. Turn ON the DC Power supply. 2. Adjust one DC Power Supply to provide 12 V on its output. 3. Adjust a second DC Power Supply to provide 5 V on its output. 4. Connect the Black and Red Banana terminated wires to the outputs of the DC supply. 5. Turn OFF the DC Power Supplies. 6. Connect the 12 V Red and Black terminated wires to the Open Loop POLs J3 (Red wires here) and J2 (Black wire here). The positive terminal is J3. 7. Connect the 5 V Red and Black terminated wires to the Open Loop POLs J4 (Red wires here) and J5 (Black wire here). The positive terminal is J4. 3.3. Wave Form Generator 1. Turn ON the Arbitrary Wave Form Generator. 2. Adjust its output to provide a 250 kHz, 0 to 5 V peak-to-peak square wave output with 50 percent duty cycle. 3. Split the output of the Generator with a BNC splitter 4. Connect a BNC cable from the output of the Arbitrary Wave Form Generator to J9 (CLKIN) on the Open Loop POL board. 5. Connect another BNC cable from the output of the Arbitrary Wave Form Generator to CH1 of the oscilloscope. 6. Engage the output of the Wave Form Generator. 3.4. Oscilloscope Setup 1. Turn on the Oscilloscope. 2. Connect a BNC from J11 (OUT85xxHS) to CH2. 3. Connect a BNC from J10 (OUT85xxLS) to CH3. 4. Connect a BNC from J8 (OUT8540) to CH4. 5. Set the scope to Trigger on CH1 and adjust Trigger Level to 1 V minimum. 6. Set CH1 to 5 V per division; set CH2/3 to 1 V per division, and set CH4 to 200 mV per division. 7. Adjust the Seconds/Division setting to 1 µs/division. 8. Adjust the level indicator for ALL channels to properly view each channel as shown in Figure 5. Rev. 0.3 3 Open-Loop POL-EVB 3.5. Electronic Load 1. Connect output of the Electronic Load to J6 (positive terminal) and J7 (negative terminal). 2. Adjust the output of the electronic load to provide 2.5 A. 3. See Figure 3 for a summary diagram of the test setup. _ Electronic Load _ Power Supply (10-15 V, 10 A) + Simulator or Equivalent (10 A max) + To Scope Si8540 DC Sensor Output + Power Supply (5 V, 100 mA) _ To Scope Si8512 High Side To Scope Sensor Output Si8512 Low Side Sensor Output Clock Input (100-500 kHz 0-5 V Square Wave) Figure 3. Summary Diagram of Test Setup 4. Turn ON the DC Power Supplies. 5. Use the digital multi-meter to measure the voltage across J6 (positive lead) to J7 (negative lead). The voltage should measure approximately 6 V. 6. Engage the output of the Electronic Load (see Figure 4). If an electronic load is not available, a 15 W, 3  resistor can be used. Figure 4. Kikusui PLZ164WA Setup 4 Rev. 0.3 Open-Loop POL-EVB 3.6. Test Conditions The oscilloscope should display waveforms similar to Figure 5. Channel 1 should output a signal with a peak voltage of 5 V and have similar slope as shown in Figure 5. Channel 2 should output a signal with a peak voltage of 500 to 800 mV and have similar slope as shown in Figure 5. Channel 3 should output a signal with a peak voltage of 500 to 800 mV and have similar slope as shown in Figure 5. Channel 4 should output a signal with a peak voltage of 250 to 350 mV and have similar slope as shown in Figure 5. The user can now vary the Open Loop POL’s input frequency (from 100 to 500 kHz), duty cycle (from 20 to 80 percent), and load (from 0 to 10 amps) to get a feel for how Silicon Labs’ Si8512, Si8234, and Si8540 operate in a real world power supply. 3.7. Isolated Supply Connection The Open Loop POL’s Si8234 ISOdriver’s outputs can be powered from a separate, quieter supply if desired. To accommodate this: 1. Move shunt on JP6 from position 2–3 to position 1–2. 2. Connect a 10–15 V supply between J1 (Red wire here) and J2 (Black wire here). The positive terminal is J1. All the above outputs on Ch1-Ch4 of the scope should be the same. Figure 5. Oscilloscope Display Rev. 0.3 5 Open-Loop POL-EVB 4. Open Loop POL Evaluation Board The Open Loop POL evaluation board has an Si8234, two Si8512s (both the QFN and SOIC packages) and a Si8540 installed. There are two Si8412s (QFN and SOIC packages) installed to allow users to evaluate either package. Refer to Figure 6 for the locations of the various I/O connectors and major components.  J1, J2, J3, Input Power: Input power connection 10–15 V, 10 A.  J4, J5 VBIAS: Isolated Input power connection 5 V, 100 mA.  J6, J7, VOUT: Supply output connection for load simulator.  J8, OUT8540: BNC provides output of Si8540, dc current to load.  J9 CLKIN: Input Clock for POL.  J10, OUTLS8512: BNC provides output of Si8512, ac current through Q2.  J11, OUTHS8512: BNC provides output of Si8512, ac current through Q1.  JP3 Disable Control: Disables VOA and VOB of Si8234.  JP4 Deadtime Control: Provides ~900 ns of deadtime when populated.  JP5 Deadtime Control: Provides ~70 ns of deadtime when populated.  JP6 ALTSPLY: Alternate means to power driver outputs. Figure 6. Open Loop POL Evaluation Board Silkscreen 4.1. Voltage and Current Sense Test Points The Open Loop POL evaluation board has several test points. These test points correspond to the respective pins on the Si8234, Si8512 and Si8540 integrated circuits as well as other useful inspection points. See See “5. Schematic” on page 7. for more details. 6 Rev. 0.3 Figure 7. Open Loop POL Evaluation Board Schematic (Power) Open-Loop POL-EVB 5. Schematic Rev. 0.3 7 Open-Loop POL-EVB 6. Bill of Materials Table 1. Open Loop POL Evaluation Board Bill of Materials 8 Qty Ref Value Rating Tol Part Number Mfr 1 C1 180 µF 6.3 V 20% 6SVPE180M Sanyo 2 C2, C3 150 µF 20 V 20% 20SVP150M Sanyo 5 C4-C6, C8, C9 1 µF 25 V 10% C0603X5R250-105K Venkel 1 C7 47 nF 25 V 20% C0603X7R250-473MGE Venkel 2 C10, C11 0.1 µF 25 V 10% C0603X5R250-104K Venkel 2 C12, C13 2.2 µF 10 V 10% C0603X5R100-225K Venkel 3 C14, C15, C16 100 µF 16 V 20% 16TQC100M Sanyo 1 C22 22 µF 16 V 20% C1812X5R160-226M Venkel 1 C17 10 µF 25 V 10% C1206X5R250-106KNE Venkel 2 D1, D2 200 mA 75 V SOD523 200 mA 75 V BAS16XV2T1G On Semi 1 D3 1 A 100 V DO214AC 1 A 100 V ES1C Vishay 1 D4 6.8 V 6.8 V 600 mW P6KE6.8A Littlefuse Inc. 1 U1 SI8234BB-C-IS SOIC16W 2.5 kVrms 5 kVrms SI8234BB-C-IS Si8234BD-C-IS Silicon Labs 1 U2 SI8512-C-ISSO20W SI8512-C-IS Silicon Labs 1 U3 SI8512-C-IMQFN12 SI8512-C-IM Silicon Labs 1 U4 SI8540-B-FSSO8 SI8540-B-FS Silicon Labs 4 J1, J3, J4, J6 Red Banana-jack 111-703-001 Johnson/Emerson 3 J2, J5, J7 Black Banana-jack 111-702-001 Johnson/Emerson 4 J8–J11 BNC Connector 227699-2 Tyco Electronics Amp 4 JP3 –JP6 Jumper TSW-102-07-T-S Samtec 1 L1 3.0 µH B82559A Epcos 2 Q1, Q2 N-CHANNEL MOSFET LFPAK HAT2165H Renesas 13 A 5.1 mΩ Rev. 0.3 Open-Loop POL-EVB Table 1. Open Loop POL Evaluation Board Bill of Materials (Continued) Qty Ref Value Rating Tol Part Number Mfr 3 R1, R2, R18 3.3  (0805) 1/10 W 5% CR0805-10W-3R3JT Venkel 1 R3 100  1/4 W 5% cr1210-4W-101JT Venkel 1 R4 4.7  1/16 W 5% CR0603-16W-4R7JT Venkel 2 R5 226  (0603) 1/16 W 1% CR0603-16W-2260FT Venkel 2 R6 470 (0603) 1/16 W 5% CR0603-16W-471JT Venkel 1 R7 10 k (0603) 1/16 W 105% CR0603-16W-103JT-14 Venkel 1 R8 100 k (0603) 1/16 W 5% CR0603-16W-104T-13 Venkel 1 R9 10 m 2W 1% LCR2512R010FT Venkel 1 R10 2 k (0603) 1/16 W 5% CR0603-16W-202JT Venkel 3 R11, R12, R16 47  (0603) 1/16 W 5% CR0603-16W-470JT Venkel 2 R13, R14 200  (0603) 1/16 W 1% CR0603-16W-2000F Venkel 1 R15 6.2 k (0603) 1/16 W 5% CR0603-16W-622JT Venkel 1 R17 1  (1206) 1/4 W 5% CR1206-8W-1R0JT Venkel 17 TP1-TP17 Test pad 151-201 Kobiconn 4 MH1–4 Stand off/screw 1902EK-ND/H546 Digikey Rev. 0.3 9 Open-Loop POL-EVB 7. Ordering Guide Table 2. Open Loop POL Evaluation Board Ordering Guide 10 Ordering Part Number Description OPENLPPOL-EVB Open Loop Point-of-Load evaluation board Rev. 0.3 Open-Loop POL-EVB DOCUMENT CHANGE LIST Revision 0.1 to Revision 0.2 Revised entire document to reflect board revision from using Si8410 to using Si8234.  Removed Figure 6, “Open Loop POL Evaluation Board Schematic (Sense)”.  Added Ordering Guide.  Revision 0.2 to Revision 0.3  Updated "3.1. Board Jumper Settings" on page 3. Deleted  JP3 in Step 3. Updated "3.5. Electronic Load" on page 4. Updated Added Step 6. Figure 4 on page 4. Rev. 0.3 11 Open-Loop POL-EVB CONTACT INFORMATION Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX 78701 Tel: 1+(512) 416-8500 Fax: 1+(512) 416-9669 Toll Free: 1+(877) 444-3032 Please visit the Silicon Labs Technical Support web page: https://www.silabs.com/support/pages/contacttechnicalsupport.aspx and register to submit a technical support request. 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