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9

DEMO MANUAL DC2688A

Rev. 0

Figure 9. Proper Measurement Equipment Setup for Evaluating Common USB Charger Profiles

QUICK START PROCEDURE

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Содержание Analog Devices DC2688A

Страница 1: ...mance Moving JP5 to PSK loca tion enables the pulse skipping mode which improves light load efficiency by reducing the switching frequency All registered trademarks and trademarks are the property of their respective owners at light load and reducing VIN quiescent current between pulses To synchronize to an external clock move JP5 to FCM W O SSM or SYNC location and apply external clock on the EXT...

Страница 2: ...MI filter is required and the input voltage should be applied at VEMI terminal As shown in the dashed box in Figure 1 functional block diagram the DC2688A demo board may also be optionally used in conjunction with the Linduino microcontroller board DC2026C and a touchscreen display shield The DC2688A demo board includes the AD5593R which is an 8 channel ADC GPIO with on chip reference and I2C inte...

Страница 3: ...3 DEMO MANUAL DC2688A Rev 0 Figure 1 DC2688A Demo Board Functional Block Diagram DESCRIPTION ...

Страница 4: ...SKIPPING MODE L XFL5030 222 RSENSE 8mΩ PERFORMANCE SUMMARY Specifications are at TA 25 C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Supply Range 6 0 42 V VBUS USB 5V Bus Voltage Without Cable Drop Compensation 4 8 5 5 2 V USB 5V Bus Voltage With Cable Drop Compensation 6 2 V IBUS Maximum Output Current RSENSE 10mΩ 2 4 A Maximum Output Current RSENSE 8mΩ 3 0 A fSW Switching Frequency 1...

Страница 5: ...200 300 400 500 600 700 800 900 1000 10 5 0 5 10 15 20 25 30 35 40 AMPLITUDE dBµV m DC2688A F04 TYPICAL PERFORMANCE CHARACTERISTICS Figure 5 DC2688A B Demo Circuit EMI Performance in CISPR 25 Radiated Emissions Test Vertical Polarization Figure 6 DC2688A B Demo Circuit EMI Performance in CISPR 25 Radiated Emissions Test Horizontal Polarization CLASS 5 PEAK LIMIT SPREAD SPECTRUM MODE FIXED FREQUENC...

Страница 6: ... 6 1V and depends on the cable drop QUICK START PROCEDURE compensation settings and D11 LED indicator lights up in green For more information on cable drop compensation please refer to LT8698S LT8698S 1 data sheet NOTE If there is no output temporarily disconnect the load to make sure that the load is not set too high 8 Once the proper output voltages are established adjust the load within the ope...

Страница 7: ...A Rev 0 Figure 7 Proper Measurement Equipment Setup for Evaluating the DC2688A B Power Stage QUICK START PROCEDURE Figure 8 Measuring Output Ripple V A IBUS LOAD V A POWER SUPPLY VIN JP2 Z JP4 Z JP3 Z VBUS IIN VIN VBUS GND ...

Страница 8: ...r off connect the input power supply to VEMI and GND turrets If the EMI EMC performance is not important connect the input power supply to VIN and GND turrets 4 Check that JP1 EN jumper is placed on the ON position QUICK START PROCEDURE 5 Turn on the power at the input NOTE Make sure that the input voltage never exceeds 42V 6 Check for proper output voltages VBUS 5V and D11 LED indicator lights up...

Страница 9: ...9 DEMO MANUAL DC2688A Rev 0 Figure 9 Proper Measurement Equipment Setup for Evaluating Common USB Charger Profiles QUICK START PROCEDURE ...

Страница 10: ...V 6 Check for proper output voltages VBUS 5V and D11 LED indicator lights up in green 7 Plug a USB cable connecting to a PC with type B connector to the type B socket of the DC2688A demo board and connect the USB cable to a computer 8 Check the STATUS pin voltage and observe STATUS yellow LED is on meaning STATUS pin is low At this point the LT8698S LT8698S 1 puts a 100μA current source on the D a...

Страница 11: ...11 DEMO MANUAL DC2688A Rev 0 QUICK START PROCEDURE Figure 10 Proper Measurement Equipment Setup for Evaluating USB CDP Charger Profiles ...

Страница 12: ...RM21BR71E475KA73L 18 2 C61 CVIN1 CAP 4 7μF X7R 50V 10 1206 MURATA GRM31CR71H475KA12L 19 1 C62 CAP 1000pF C0G 50V 5 0603 MURATA GRM1885C1H102JA01D 20 1 COUT1 CAP 22μF X7R 25V 20 1210 MURATA GRM32ER71E226ME15L 21 2 D1 D13 LED GREEN DIFFUSED 0603 BROADCOM HSMG C190 22 1 D3 LED RED NON DIFFUSED 1208 PLCC 2 VISHAY VLMS30K1L2 GS08 23 1 D4 LED YELLOW NON DIFFUSED 1208 PLCC 2 VISHAY VLMY30K2M1 GS08 24 2 D...

Страница 13: ... ADC DAC 8 CH 12 BIT LFCSP 16 ANALOG DEVICES AD5593RBCPZ 53 1 Y1 CRYSTAL 24 0000MHz 6pF 2 0mm 1 6mm SMD MURATA XRCGB24M000F3M00R0 DC2688A A Version Specific Components 1 1 U1 IC USB CHARGER LQFN 32 ANALOG DEVICES LT8698SEV PBF DC2688A B Version Specific Components 1 1 U1 IC USB CHARGER LQFN 32 ANALOG DEVICES LT8698SEV 1 PBF Additional Demo Board Circuit Components 1 1 C8 CAP 22μF ALUM ELECT 63V 20...

Страница 14: ... C64 0 1uF C3 1uF 50V LT3065HMSE 5 U4 IN1 1 IN2 2 SHDN 3 PWRGD 4 IMAX 5 NC 6 NC 7 REF BYP 8 ADJ 9 SENSE 10 OUT2 11 OUT1 12 GND 13 J4 QuikEval MOSI SDA 7 EESDA 9 V 1 5V 2 CS 6 SCK SCL 4 EEVCC 10 MISO 5 EESCL 11 EEGND 12 AUX 14 GND 3 GND 13 GND 8 C53 0 1uF C5 0 01uF C61 4 7uF 1206 50V R49 10k JP7 ON OFF LDO 5V 1 3 2 R61 1k R47 200k R63 20k D8 BAT54WS D9 BAT54WS R52 4 99k R59 0 R48 100k D12 BAT46WJ 2...

Страница 15: ...6 1000pF E5 FLT C49 1uF 10V COUT2 OPT 7343 C50 0 1uF 0402 25V C56 1uF 25V X5R E7 VEMI 6V 42V R36 10k C26 1uF E6 STATUS C42 10uF 50V 1210 C47 4700pF C45 1uF 0603 R11 100k E1 VIN 6V 42V R28 100k R9 330 C38 1uF 50V C30 0 1uF R41 10k L6 0 47uH IHLP1616BZERR47M11 C41 10uF 50V 1210 CVIN1 4 7uF 1206 50V U2 USB2422 VBUS_DET 16 USBUP_DM 19 USBUP_DP 20 SMBCLK 14 SMBDATA 13 SUSP_IND 17 RESET_N 15 RBIAS 24 XT...

Страница 16: ...disclose or transfer any portion of the Evaluation Board to any other party for any reason Upon discontinuation of use of the Evaluation Board or termination of this Agreement Customer agrees to promptly return the Evaluation Board to ADI ADDITIONAL RESTRICTIONS Customer may not disassemble decompile or reverse engineer chips on the Evaluation Board Customer shall inform ADI of any occurred damage...

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