Analog Devices EVAL-LTC7872-AZ Operation Manual

General Description
The evaluation board EVAL-LTC7872-AZ is a high power,
high efficiency, four-phase bidirectional converter featuring
the LTC7872 and LTC7060. The terminals labeled V
and V are either inputs or outputs depending on the
LOW
direction of power flow. When the switch SW1 is set to the
BUCK position, V provides a 14V output and V
LOW
the input with a range of 30V to 75V with a maximum load
current of 120A. When the switch SW1 is in the BOOST
position, V provides a 48V output and V
HIGH
input with a range of 10V to 14V with a maximum load
current of 34A at a 14V input voltage. The maximum I
current is 120A in both directions. The maximum output
power is 1.7kW when operating as a buck within the input
voltage range. When operating as a boost, the maximum
output power is 1.6kW when the input voltage is 14V.
External airflow is required when operating at maximum
power in either direction of power flow. The MOSFETs in
each phase are driven by the LTC7060 half-bridge driver.
The inductor current for each phase is sensed with a low
1mΩ sense resistor using a highly accurate AC/DC
current-sensing architecture with low power dissipation.
The LTC7872's constant-current loop provides a DC
current limit for the current flowing in or out of the V
terminal depending on the state of the BUCK pin. This
current can be programmed with the SETCUR pin and
monitored with the IMON pin.
Rev 0; 2/25
O n e A n a l o g W a y , W i l m i n g t o n , M A 0 1 8 8 7 - 2 3 5 6 , U . S . A .
48V-to-14V, 4-phase, 1.7kW Bidirectional Supply
Features
•
SPI-Compatible Port
•
Pin-Selectable, Light-Load Operating Modes
• Buck: FCM, DCM, and Burst Mode Operation
HIGH
• Boost: FCM and DCM
•
Optional
is
HIGH
Modulation
•
Footprints for Optional PG-HSOF-8-1 MOSFETs and
Coupled Inductors
is the
•
Optional UVLO Circuits for V
LOW
•
SYNC, CLKOUT, RUN, FAULT, PGOOD, and PWMEN
LOW
Pins
•
A DC2026C Linduino Board and QuikEval Software
Allow:
• Increasing or Decreasing the V
Regulation Voltage When SW1 Switch Is in
Buck/Boost Position
• Changes to the DC Current Limit Using the
SETCUR Pin
• Making Adjustments to the Frequency Spread and
Modulation Rate of the Spread Spectrum Circuit
When Spread Spectrum Is Enabled
• Monitoring the Operational Status and Faults of the
LTC7872
LOW
Design files for this circuit board are available.
DOCUMENT FEEDBACK
T e l : 7 8 1 . 3 2 9 . 4 7 0 0
Evaluation Board User Guide
EVAL-LTC7872-AZ
LTC7872/LTC7060
Jumper to Enable
and V
HIGH
LOW
© 2 0 2 4 A n a l o g D e v i c e s , I n c . A l l r i g h t s r e s e r v e d .
Spread-Spectrum
LOW
/V
HIGH
TECHNICAL SUPPORT