Datasheet

UC28023
UC28025
SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010
5
www.ti.com
ELECTRICAL CHARACTERISTICS
T
A
=--40°C to 105°C,T
J
=T
A,
R
T
=3.65kΩ,C
T
=1nF,V
CC
= 15 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SOFT-START
I
CHG
Charge current V
SS
=0.5V 3 9 20 μA
I
DISCHG
Discharge current V
SS
=1.0V 1.0 7.5 mA
CURRENT LIMIT/SHUTDOWN
I
LIMIT
Current limit bias current 0V<V
(ILIM/SD)
<4V ±10 μA
ILIMIT Offset voltage UC28023 15 mV
I
LIMREF
Common mode range
(1)
UC28023 1.00 1.25
Current limit threshold voltage UC28025 0.9 1.0 1.1
V
Shutdown threshold voltage 1.25 1.40 1.55
V
t
DELAY
Delay to output time
(1)
50 80 ns
OUTPUT
V
L
o
w
l
e
v
e
l
o
u
t
p
u
t
v
o
l
t
a
g
e
I
OUT
=20mA 0.25 0.40
V
OL
Low-level output voltage
I
OUT
= 200 mA 1.2 2.2
V
V
H
i
g
h
l
e
v
e
l
o
u
t
p
u
t
v
o
l
t
a
g
e
I
OUT
=--20mA 13.0 13.5
V
V
OH
High-level output voltage
I
OUT
= --200 mA 12 13
Collector leakage V
C
=30V 100 500 μA
Rise time / Fall time
(1)
C
LOAD
=1nF 30 60 ns
UNDERVOLTAGE LOCKOUT (UVLO)
Start threshold voltage 8.8 9.2 9.6
V
Hysteresis 0.4 0.8 1.2
V
SUPPLY CURRENT
Start-up current V
CC
=8V 1.1 2.0
m
A
I
CC
Operating current V
INV
=V
RAMP
=V
ILIM
=0VV
INV
=1V 25 35
m
A
(1)
Ensured by design. Not production tested.
THERMAL RESISTANCE
PACKAGE θ
JA
(°C/W) θ
JC
(°C/W)
N
(2)
90
(2)
45
DW
(2)
50--100
(2)
27
(2)
Specified θ
JA
(junction-to-ambient) is for devices mountied to 5-square-inch FR4 P C board with one ounce copper
where noted. When resistance range is given, lower values are for 5-square-inch aluminum PC board. Test PWB is 0.062
inches thick and typically uses 0.635 mm trace width for power packages and 1.3 mm trace widths for non-power
packages with a 100x100 mil probe land area at the end of each trace.