5
dc1717afa
DEMO MANUAL DC1717A
turrets
Jumpers
leDs
V1: 12V supply input; do not exceed ±42V.
V2: 5V supply input; do not exceed ±42V.
V3: 8V supply input; do not exceed ±42V.
GND: Adjacent ground connection for input supplies.
VOUT: Output for up to 2A load.
GND: Adjacent ground connection for load.
AVI: Auxiliary Voltage Input. 6V to 24V input regulated
by U4 to 5V for LEDs, logic and pull ups on various pins.
GND: Adjacent ground connection for auxiliary supply.
5V: 5V regulated output provided by U4, for powering
logic, LEDs and pull ups. Use this turret to verify that 5V
is present.
Each of the following turrets is a direct connection to the
like-name LTC4417 pin:
VALID1
: pulled up with 100kOhm to auxiliary 5V supply.
VALID2
: pulled up with 100kOhm to auxiliary 5V supply.
VALID3
: pulled up with 100kOhm to auxiliary 5V supply.
EN: pulled up by 2μA internal to the LTC4417. Optional
R33 may be added as a pull-up to the auxiliary 5V power
supply.
SHDN
: pulled up by 2μA internal to the LTC4417. Optional
R36 may be added as a pull-up to the auxiliary 5V power
supply.
CAS: used to cascade a second DC1717A. Connect the
CAS turret of the high priority DC1717A to the EN turret
of the lower priority DC1717A.
Grounds must be connected in common.
JP1, HYS: Add 30mV fixed hysteresis to the OV and UV
comparators, or 3% referred to actual supply input. In the
RHYS position input-referred hysteresis is set to 6.4%, as
controlled by R11. Default stuffing position is for 30mV.
JP2, EN: Directly controls EN pin. Default stuffing position
is ON, pulled up by internal 2μA current source.
No more than one of D8, D9 and D10 will be illuminated
at any given moment:
D8: indicates power is being taken from V1.
D9: indicates power is being taken from V2.
D10: indicates power is being taken from V3.
D11, D16 and D17 indicate the presence of a valid input
on any of the three supplies:
D17: V1 is 12V±20%.
D11: V2 is 5V±20%.
D16: V3 is 8V±20%.
