LTC3780EG Linear Technology, LTC3780EG Datasheet - Page 8

• Manufacturer Part Number: LTC3780EG
• Description: IC,SMPS CONTROLLER,CURRENT-MODE,CMOS,SSOP,24PIN,PLASTIC
• Manufacturer: Linear Technology

PI FU CTIO S
LTC3780
500mV/DIV
PGOOD (Pin 1/Pin 30): Open-Drain Logic Output. PGOOD
is pulled to ground when the output voltage is not within
±7.5% of the regulation point.
SS (Pin 2/Pin 31): Soft-start reduces the input power
sources’ surge currents by gradually increasing the
controller’s current limit. A minimum value of 6.8nF is
recommended on this pin.
SENSE
and Reverse Current Detect Comparators. The I
8
TYPICAL PERFOR A CE CHARACTERISTICS
5A/DIV
U
V
OUT
I
L
+
Load Step
V
V
LOAD STEP: 0A TO 5A
CONTINUOUS MODE
IN
OUT
(Pin 3/Pin 1): The (+) Input to the Current Sense
U
= 18V
= 12V
500mV/DIV
10V/DIV
1A/DIV
V
OUT
V
IN
I
L
200µs/DIV
Line Transient
U
V
I
V
CONTINUOUS MODE
LOAD
OUT
IN
STEP: 7V TO 20V
= 12V
= 1A
(SSOP/QFN)
W
500µs/DIV
U
3780 G27
500mV/DIV
5A/DIV
V
OUT
I
3780 G30
L
Load Step
V
V
LOAD STEP: 0A TO 5A
CONTINUOUS MODE
IN
OUT
TH
= 12V
= 12V
pin
200µs/DIV
voltage and built-in offsets between SENSE
pins, in conjunction with R
threshold.
SENSE
and Reverse Current Detect Comparators.
I
plifier Compensation Point. The current comparator thresh-
old increases with this control voltage. The voltage ranges
from 0V to 2.4V.
500mV/DIV
TH
10V/DIV
(Pin 5/Pin 3): Current Control Threshold and Error Am-
1A/DIV
V
OUT
V
IN
I
–
L
Line Transient
V
I
V
CONTINUOUS MODE
(Pin 4/Pin 2): The (–) Input to the Current Sense
LOAD
OUT
IN
STEP: 20V TO 7V
T
= 12V
A
= 1A
3780 G28
= 25°C unless otherwise noted.
500mV/DIV
500µs/DIV
5A/DIV
V
OUT
I
L
Load Step
V
V
LOAD STEP: 0A TO 5A
CONTINUOUS MODE
IN
OUT
SENSE
= 6V
= 12V
3780 G31
, set the current trip
200µs/DIV
–
and SENSE
3780f
3780 G29
+