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DEMO MANUAL DC1978A

Figure 10. Cascade Sequencing Up with DC1978A

Figure 11. Time Based Sequencing Down with DC1978A

COMMON DEMO BOARD OPERATIONS

7. Use Group Operation “Sequence Off” to power down

all supplies

8. The power supplies cascade ON/OFF as shown in Figures

10 and 11 below.

DC1978a F10

DC1978a F11

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Содержание DC1978A

Страница 1: ...ing on the information therein All referenced brands product names service names and trademarks are the property of their respective owners 00000005981LF 000 EOS Power Buy Now We have 45 000 LP502030...

Страница 2: ...C1810A Just plug and play Multiple DC1978A board sets can be cascaded together to form a high channel count power supply see Multiboard Arrays This cascaded configuration demonstrates features of the...

Страница 3: ...G dac_gain 0 Buffer Gain Setting 1 MFR_CONFIG dac_gain 1 1 38 2 65 V V Temperature Sensor Resolution 0 136 C LSB Voltage Supervisor Input Voltage Range Low Resolution VIN_VS VSENSEP n VSENSEM n High R...

Страница 4: ...saved and reloaded at a later time LTpowerPlay provides unprecedented diagnostic and debug features It becomes a valuable diagnostic tool during board bring up to program or tweak the power managemen...

Страница 5: ...e LTC2974 EEPROM c Set the control jumpers JP4 to JP7 to SW0 to SW3 position to connect the switches to the LTC2974 control pins d Set all control switches SW0 SW1 SW2 and SW3 to HI 4 Confirm that all...

Страница 6: ...the LTC2974 This reads the configuration from the RAM of LTC2974 and loads it into the GUI d Save the demo board configuration to a proj file ClicktheSaveiconandsavethefile Nameitwhatever you want 8 T...

Страница 7: ...6 dc1978af DEMO MANUAL DC1978A DC1978A DETAILS TOP SIDE Figure 3 DC1978A Top Details DC1978a F03...

Страница 8: ...BINARY DEVICE ADDRESS BITS ADDRESS PINS 7 Bit 8 Bit 6 5 4 3 2 1 0 R W ASEL1 ASEL0 ALERT RESPONSE 0C 19 0 0 0 1 1 0 0 1 X X GLOBAL 5B B6 1 0 1 1 0 1 1 0 X X N 0 5C B8 1 0 1 1 1 0 0 0 L L N 1 5D BA 1 0...

Страница 9: ...QUENCING The LTC2974 supports tracking power supplies that are equipped with a tracking pin and configured for tracking A tracking power supply uses a secondary feedback ter minal TRACK to allow its o...

Страница 10: ...e up after the group has tracked up or sequence down before the group has tracked down TodemonstratethetrackingfeaturesofLTC2974 DC1810A has three jumpers JP1 JP2 and JP3 that can be set to connect re...

Страница 11: ...ion This connects the TRACK pins of the slave supply channels to the output voltage of the master channel through resistive dividers see Figure 6 2 Set DC1809A jumper JP4 to SW0 position to propagate...

Страница 12: ...nd the TON_DELAY for the master channel to 20ms COMMON DEMO BOARD OPERATIONS 6 Set the TOFF_DELAY of all slaves CH1 CH2 and CH3 to 20ms and the TOFF_DELAY for the master channel to 0ms 7 Set the TON_R...

Страница 13: ...ing Supplies Up with DC1978A Figure 8 Tracking Supplies Down with DC1978A 8 Set the track_en_chan1 track_en_chan2 and track_ en_chan3 bits in MFR_CONFIG3 to 1 9 ToggletheCONTROL0switchandobservethesyn...

Страница 14: ...high and the associated control input is connected to the power good output of the previous power supply In this configuration each slave channel s startup is delayed until the previous supply has pow...

Страница 15: ...r DC1978A Set the DC1809A power good cascading jumpers JP4 JP5 JP6 and JP7 to SW0 PG_0 PG_1 PG_2 positions This connects the power good and control pins as shown in Figure 9 2 Enable all output supply...

Страница 16: ...af DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS 5 Set the cascade_on bit in MFR_CONFIG register for CH1 CH2 and CH3 The master channel has this bit cleared 6 Use Group Operation On to power up all...

Страница 17: ...uencing Up with DC1978A Figure 11 Time Based Sequencing Down with DC1978A COMMON DEMO BOARD OPERATIONS 7 Use Group Operation Sequence Off to power down all supplies 8 ThepowersuppliescascadeON OFFassh...

Страница 18: ...Bus PMBus controller may be pluggedintoeitherboard IfbothLTC2974sdonotshow up in the GUI click the hourglass icon to enumerate the I2C bus and find the addresses of the parts Make sure to set differen...

Страница 19: ...offset of LTC2974 LOW LOW JP3 WRITE PROTECT Write protect the LTC2974 EEPROM memory OFF JP4 JP5 JP6 JP7 CONTROL0 CONTROL1 CONTROL2 CONTROL3 Implement cascade sequencing by connecting power good signal...

Страница 20: ...19 dc1978af DEMO MANUAL DC1978A DC1809A DETAILS BOTTOM...

Страница 21: ...IN HEADER 20 DUAL ROW MILL MAX 802 40 020 20 001 16 1 J4 CONN FMALE 50POS DL 0 1 R A GOLD SULLINS CONNECTOR SOLUTIONS PPPC252LJBN RC 17 1 J5 CONN HEADER VERT 0 050 4POS TYCO ELECTRONICS 5 104071 7 18...

Страница 22: ...C4365CTS8 Hardware Components For Demo Board Only 39 2 JP1 JP2 CONN HEADER 4POS 2mm VERT T H 3M 951104 8622 AR 40 5 JP3 JP4 JP5 JP6 JP7 CONN HEADER 3POS 2mm VERT T H SULLIN NRPN031PAEN RC 41 4 SW1 SW2...

Страница 23: ...22 dc1978af DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM...

Страница 24: ...23 dc1978af DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM...

Страница 25: ...24 dc1978af DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM...

Страница 26: ...and Switch Configuration Default Position Shown in Grey in the Figure Above REFERENCE DESIGNATOR SIGNAL NAME USAGE DEFAULT JP1 JP2 Track Soft Start Set CH0 tracking or soft start for CH1 CH2 and CH3...

Страница 27: ...26 dc1978af DEMO MANUAL DC1978A DC1810A DETAILS BOTTOM...

Страница 28: ...2000pF 16V CERM X7R 0603 MURATA GRM188R71C223KA01D 16 4 C12 C19 C37 C42 CAP CER 4 7 F 10V X5R 0603 TAIYO YUDEN LMK107BJ475KA T 17 2 C14 C25 CAP CER 0 47 F 10V 20 X5R 0603 AVX 0603ZD474MAT2A 18 4 C15 C...

Страница 29: ...03150FKFEA 56 1 R70 RES 13 3k 1 10W 1 0603 SMD NIC NRC06F1332TRF 57 3 R71 R75 R76 RES 5 49k 1 10W 1 0603 SMD PANASONIC ECG ERJ 3EKF5491V 58 1 R73 RES 10k 1 10W 1 0603 SMD PANASONIC ECG ERJ 3EKF1002V 5...

Страница 30: ...29 dc1978af DEMO MANUAL DC1978A DC1810A SCHEMATIC DIAGRAM...

Страница 31: ...30 dc1978af DEMO MANUAL DC1978A DC1810A SCHEMATIC DIAGRAM...

Страница 32: ...ation is believed to be accurate and reliable However no responsibility is assumed for its use Linear Technology Corporation makes no representa tion that the interconnection of its circuits as descri...

Страница 33: ...UDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE EXCEPT TO THE EXTENT OF THIS INDEMNITY NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT SPECIAL INCIDENTAL OR CON...

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