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Linear Technology DC1978A Manual

Ltc2974 quad digital power supply manager with eeprom
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This coversheet was created by Verical, a division of Arrow Electronics, Inc. ("Verical"). The attached document was created by the part supplier,
not Verical, and is provided strictly 'as is.' Verical, its subsidiaries, affiliates, employees, and agents make no representations or warranties
regarding the attached document and disclaim any liability for the consequences of relying on the information therein. All referenced brands,
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Summary of Contents for Linear Technology DC1978A

  • Page 1 We have 45,000 LP502030-PCM-NTC-LD-A02554 - EEMB - Lithium Battery Rectangular 3.7V 250mAh Rechargeable in stock now. Starting at $0.034. This EEMB part is fully warrantied and traceable. 00000005981LF-000 DC1978A EOS Power ANALOG DEVICES Buy Now Buy Now Looking for a discount?

  • Page 2: Digital Power Supply

    • Programmable Watchdog Timer information to be shared across multiple LTC2974s allow- L, LT, LTC, LTM, μModule, PolyPhase, Linear Technology and the Linear logo are registered ing for the formation of a single, coherent power supply trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

  • Page 3: Performance Summary

    Current Supervisor Total Unadjusted 50mV ≤ V ≤ 170mV ±3 IN_CS Error < 50mV ±1.5 IN_CS C Serial Clock Frequency DC1978A DEMO SYSTEM SPECIFICATIONS DC1978A Power Supply Specifications POWER SUPPLY CHANNEL Controller LTC3860, V LTC3860, V LTM4620, V LTM4620, V OUT1 OUT2...
  • Page 4 LTC3880 dual output PolyPhase ® step-down DC/DC targets, including the LTC2974’s DC1978A demo system controller with digital power system management. The or a customer board. The software also provides an au- software supports a variety of different tasks. You can...

  • Page 5: Quick Start Procedure

    DEMO MANUAL DC1978A QUICK START PROCEDURE The following procedure describes how to set up a DC1978A 4. Confirm that all jumpers and switches on DC1810A are demo system. set to their defaults as follows. 1. Download and install the LTpowerPlay GUI: a.
  • Page 6 DEMO MANUAL DC1978A QUICK START PROCEDURE b. A green message box shows for a few seconds in the 9. You are now ready to view one of the LTC2974 demo lower left hand corner, confirming that the LTC2974 videos embedded in the LTpowerPlay GUI or experi- is communicating: ment with the part on your own.
  • Page 7 DEMO MANUAL DC1978A DC1978A DETAILS TOP SIDE DC1978a F03 Figure 3. DC1978A Top Details dc1978af...
  • Page 8 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS DC1978A LEDS SELECTING I C ADDRESS The red LEDs on ALERTB, FAULTB0, FAULTB1 and AUX- The I C/SMBus address of the LTC2974 equals the base FAULTB (D3, D4, D5, D2) indicate a fault has occurred.
  • Page 9 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS FAULT SHARING SETUP IN THE GUI TRACKING BASED SEQUENCING Use the fault sharing setup tool to configure the fault The LTC2974 supports tracking power supplies that are sharing in the GUI. Before doing so, view the fault sharing equipped with a tracking pin and configured for tracking.

  • Page 10: Master Channel

    DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS when the master is down requires supervisors monitoring • Ability to reconfigure selected channels that are part of the slaves to disable UV detection. Slave UC detection must a tracking group to sequence up after the group has...
  • Page 11 PROCEDURE TO DEMONSTRATE TRACKING WITH DC1978A 1. Start with the default LTC2974 EEPROM and jumper settings for DC1978A. Set the jumpers JP1, JP2 and JP3 to TRACK CH0 position. This connects the TRACK pins of the slave supply channels to the output voltage of the master channel through resistive dividers (see Figure 6).
  • Page 12 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS 5. Set the TON_DELAY of all slaves (CH1, CH2 and CH3) to 0ms and the TON_DELAY for the master channel to 20ms. 6. Set the TOFF_DELAY of all slaves (CH1, CH2 and CH3) to 20ms and the TOFF_DELAY for the master channel to 0ms.
  • Page 13 MFR_CONFIG3 to 1. 9. Toggle the CONTROL0 switch and observe the synchro- nized tracking behavior of the power supplies. DC1978a F07 DC1978a F08 Figure 7. Tracking Supplies Up with DC1978A Figure 8. Tracking Supplies Down with DC1978A dc1978af...
  • Page 14 DEMO MANUAL DC1978A COMMON DEMO BOARD OPERATIONS CASCADE SEQUENCING high and the associated control input is connected to the power good output of the previous power supply. In this Cascade sequence ON allows a master power supply to configuration each slave channel’s startup is delayed until sequence ON a series of slave supplies by connecting the previous supply has powered up.
  • Page 15 PROCEDURE TO DEMONSTRATE CASCADE SEQUENCING WITH DC1978A 1. Start with the default LTC2974 EEPROM and jumper settings for 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.
  • Page 16 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 supplies dc1978af...
  • Page 17 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 F11 DC1978a F10 Figure 10. Cascade Sequencing Up with DC1978A Figure 11. Time Based Sequencing Down with DC1978A dc1978af...
  • Page 18 If both LTC2974s do not show resentative system tree and read all hardware settings up in the GUI, click the hourglass icon to enumerate into the GUI. Figure 12. Array of Multiple DC1978A Demo Boards dc1978af...
  • Page 19 DEMO MANUAL DC1978A DC1809A DETAILS TOP Table 4. DC1809A Default Jumper and Switch Configuration (Default Position Shown in Grey in the Figure Above) REFERENCE DESIGNATOR SIGNAL NAME USAGE DEFAULT JP1, JP2 ASEL0, ASEL1 Set the address offset of LTC2974 LOW, LOW...
  • Page 20 DEMO MANUAL DC1978A DC1809A DETAILS BOTTOM dc1978af...
  • Page 21 DEMO MANUAL DC1978A DC1809A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components LTC2974 LINEAR TECHNOLOGY LTC2974CUP C1, C2, C3, C4, C6, C8, C9 CAP CERAMIC 0.10μF 16V X7R 0402 TDK C1005X7R1C104K CAP CER 0.10μF 25V X5R 0402...
  • Page 22 DEMO MANUAL DC1978A DC1809A PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER LT1763 - 500mA, LOW NOISE, LDO MICROPOWER LINEAR TECHNOLOGY LT1763CS8-3.3 REGULATORS U4, U5 IC BUFF/DVR DL NON-INV SC706 TEXAS INST SN74LVC2G07DCKR LTC4365 - UV, OV AND REVERSE SUPPLY...
  • Page 23 DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM dc1978af...
  • Page 24 DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM dc1978af...
  • Page 25 DEMO MANUAL DC1978A DC1809A SCHEMATIC DIAGRAM dc1978af...
  • Page 26 DEMO MANUAL DC1978A DC1810A DETAILS TOP Table 5. DC1810A Default Jumper 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, SOFT-START...
  • Page 27 DEMO MANUAL DC1978A DC1810A DETAILS BOTTOM dc1978af...
  • Page 28 DEMO MANUAL DC1978A DC1810A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components R3, R4, R7, R8, R34, R35, R38, RES 1k 1/10W 1% 0603 SMD PANASONIC ERJ-3EKF1001V R39, R40, R41, R43, R44, R53, R54, R58, R59 R10, R16, R29, R33, R47, R49, R62, RES 100Ω...
  • Page 29 DEMO MANUAL DC1978A DC1810A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R9, R28 RES 1k 1/10W 1% 0603 SMD PANASONIC ERJ-3EKF1001V R5, R21 RESISTOR 2.2Ω 1/10W 5% 0603 PANASONIC - ECG ERJ-3GEYJ2R2V R6, R23 RES 10Ω 1/10W 1% 0603 SMD...
  • Page 30 DEMO MANUAL DC1978A DC1810A SCHEMATIC DIAGRAM dc1978af...
  • Page 31 DEMO MANUAL DC1978A DC1810A SCHEMATIC DIAGRAM dc1978af...
  • Page 32 Information furnished by Linear Technology Corporation 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 described herein will not infringe on existing patent rights.
  • Page 33 Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods.