Linear Technology DC1717A, Демонстрационное руководство

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dc1717afa
DEMO MANUAL DC1717A
Description
LTC4417
Prioritized PowerPath™ Controller
Demonstration circuit DC1717A uses the LTC
®
4417 to
arbitrate between three input supply rails, selecting the
highest priority, valid supply to power the load. The rail’s
priority is defined by the input connection (V1-V3). Each
rail has overvoltage and undervoltage thresholds set by
external resistors. If the highest priority rail voltage falls
out of the defined window (overvoltage or undervoltage),
the rail with the next highest priority, which is valid, is
L
, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
performance summary
Specifications are at T
A
= 25°C
enabled and powers the load. Two or more LTC4417s
can be cascaded to provide switchover between more
than three rails.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1717A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V1-V3, V
OUT
V1 to V3, V
OUT
Operating Supply Range 2.5 36 V
ΔV
G
Open (VS-VG) Clamp Voltage V
OUT
= 11V, G1 to G3 = Open 5.4 6.2 6.7 V
ΔV
G(SOURCE)
Sourcing (VS-VG) Clamp Voltage V
OUT
= 11V, I = –10µA 5.8 6.6 7 V
ΔV
G(SINK)
Sinking (VS-VG) Clamp Voltage V
OUT
= 11V, I = 10µA 4.5 5.2 6 V
ΔV
G(OFF)
G1 to G3 Off (VS-VG) Threshold V1 = V2 = V3 = 2.8V, V
OUT
= 2.6V, G1 to G3 Rising Edge 0.12 0.35 0.6 V
ΔV
G(SLEW,ON)
G1 to G3 Pull-Down Slew Rate V
OUT
= 11V, C
GATE
= 10nF 4 9 20 V/µs
ΔV
G(SLEW,OFF)
G1 to G3 Pull-Up Slew Rate V
OUT
= 11V, C
GATE
= 10nF 7.5 13 22 V/µs
I
GATE(LOW)
G1 to G3 Low Pull-Down Current V
OUT
= 2.6V, V1 to V3 = 2.8V, (G1 to G3) = ΔV
G
+ 300mV 0.8 2 7 µA
V
REV
Reverse Voltage Threshold Measure (V1 to V3) – V
OUT
, V
OUT
Falling 30 120 200 mV
t
G(SWITCHOVER)
Break-Before-Make Time V
OUT
= 11V, C
GATE
= 10nF 0.7 2 3 µs
V
VALID(OL)
VALID1 to VALID3 Output Low Voltage I = 1mA, (V1 to V3) = 2.5V, V
OUT
= 0V 0.2 0.55 V
t
PVALID(OFF)
VALID1 to VALID3 Delay OFF from
OV/UV Fault
5 8 13 µs
V
SHDN (THR)
SHDN Threshold Voltage SHDN Rising 0.4 0.8 1.2 V
V
SHDN _EN(HYS)
SHDN , EN Threshold Hysteresis 100 mV
I
SHDN _EN
SHDN , EN Pull-Up Current SHDN = EN = 0V –0.5 –2 –5 µA
V
OV_UV(THR)
OV1 to O3, UV1 to UV3 Comparator
Threshold
V
OUT
= 11V, OV1 to OV3 Rising, UV1 to UV3 Falling 0.985 1 1.015 V
V
OV_UV(HYS)
OV1 to O3, UV1 to UV3 Comparator
Hysteresis
V
OUT
= 11V 15 30 45 mV
t
VALID
V1 to V3 Validation Time 100 256 412 ms
V1 Operating Voltage of Channel V1 9.6 12 14.4 V
V2 Operating Voltage of Channel V2 4 5 6 V
V3 Operating voltage of Channel V3 6.4 8 9.6 V
I
LOAD
Load Current 2 A
AVI Auxiliary Voltage Input 6 24 V