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dc2160af
DEMO MANUAL DC2160A
OVERVIEW
TURRETS
JUMPERS
LEDS
The DC2160A includes the LTC4419 2-input pri-
oritizer (U1), LDO regulator with 2.5V output voltage
(U2-LT1763) for powering LEDs and logic, four LEDs
(D4-D7) for visual information, two jumpers (JP1, JP2)
for selecting the power source for the LDO, push but-
ton (SW1) for engaging freshness seal mode, and a few
turrets for connecting the board to power sources, load
and measuring instrument. Auxiliary components—LDO
and logic—are placed on the bottom side of board.
The DC2160A design permits operation of each channel
over its full operating voltage range.
Provision is made for increasing the hysteresis of auxil-
iary comparator 1 and auxiliary comparator 2 by placing
optional resistors R17/R19.
V1 (E1):
12V supply input; should not 18V, and
should be larger than –15V.
V2 (E8):
5V supply input; should not 18V, and
should be larger than –15V.
ADJ (E3):
Adjustable comparator non-inverting input for
setting switchover threshold level.
VCMP1_TOP (E2):
Input for voltage monitored by first
auxiliary comparator CMP1.
VCMP2_TOP (E7):
Input for voltage monitored by second
auxiliary comparator CMP2.
CMP1 (E4):
First auxiliary comparator CMP1 non-inverting
input.
CMP2 (E6):
Second auxiliary comparator CMP2 non-
inverting input.
GND (E5, E11, and E12):
Common ground terminal.
OUT (E9):
Output for up to 2A load.
LDO_EXT (E13):
Positive terminal for external auxiliary
3.5V to 20V power supply.
V2P5V (E10):
LDO output voltage terminal (2.5V).
JP1, LDO:
ON/OFF switch for LDO.
JP2, LDO_POWER:
Power supply selection for LDO.
D4:
Indicates LDO output voltage.
D5:
Indicates first auxiliary comparator output stage
(CMPOUT1 pin).
D6:
Indicates second auxiliary comparator output stage
(CMPOUT2 pin).
D7:
Indicates powering load from V2 source.
