Datasheet

UC28023
UC28025
SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010
4
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
REFERENCE
V
REF
Reference voltage T
J
=25°C, I
REF
=1mA 5.05 5.10 5.15 V
Line regulation voltage 10 V ≤ V
CC
≤ 30 V 2 15
m
V
Load regulation voltage 1mA≤ I
REF
≤ 10 mA 5 15
m
V
Temperature stability
(1)
T
(min)
<T
A
<T
(max)
0.2 0.4 mV/°C
Total output voltage variation
(1)
Line, load, temperature 4.95 5.25 V
Output noise voltage
(1)
10Hz<f<10kHz 50 μV
Long term stability v oltage
(1)
T
J
= 125°C, 1000 hours 5 25 mV
I
SS
Short circuit current V
REF
=0V -- 2 0 -- 5 0 --100 mA
OSCILLATOR
f
OSC
Initial accuracy
(1)
T
J
=25°C 360 400 440 kHz
Voltage stability
(1)
10 V ≤ V
CC
≤ 30 V 0.2% 2.0%
Temperature stability
(1)
T
(min)
<T
A
<T
(max)
5%
Total voltage variation
(1)
Line, temperature 340 460 kHz
V
CLOCK_H
High-level clock output voltage 3.9 4.5
V
CLOCK_L
Low-level clock output voltage 2.3 2.9
V
RAMP(p)
Ramp peak voltage
(1)
2.6 2.8 3.0
V
V
RAMP(v)
Ramp valley voltage
(1)
0.70 1.00 1.25
V
V
RAMP(v-p)
Ramp vally-to-peak voltage
(1)
1.6 1.8 2.0
ERROR AMPLIFIER
V
IN
Input offset voltage 15 mV
I
BIAS
Input bias current 0.6 3.0
A
I
IN
Input offset current 0.1 1.0
μ
A
A
VOL
Open loop gain 1V≤ V
OUT
≤ 4V 60 95
CMRR Common mode rejection ratio 1.5 V ≤ V
CM
≤ 5.5 V 75 95
dB
PSRR Power supply rejection ratio 10 V ≤ V
CC
≤ 30 V 85 110
d
B
I
OUT(sink)
Output sink current V
(EAOUT)
=1V 1.0 2.5
m
A
IOUT(src)
Output source current V
(EAOUT)
=4V -- 0 . 5 -- 1 . 3
m
A
V
OH
High-level output voltage I
(EAOUT)
=--0.5mA 4.0 4.7 5.0
V
V
OL
Low-level output voltage I
(EAOUT)
=1mA 0 0.5 1.0
V
Unity gain bandwidth
(1)
3.0 5.5 MHz
Slew rate
(1)
6 12 V/μs
PWM COMPARATOR
I
BIAS
RAMP bias current V
RAMP
=0V -- 1 -- 5 μA
M
a
x
i
m
u
m
d
u
t
y
c
y
c
l
e
UC28023 80% 90%
Maximum duty cycle
UC28025
(2)
40% 45%
M
i
n
i
m
u
m
d
u
t
y
c
y
c
l
e
UC28023 0%
Minimum duty cycle
UC28025
0%
EAOUT zero DC threshold V
RAMP
=0V 1.10 1.25 1.40 V
t
DELAY
Delay to output time
(1)
50 100 ns
(1)
Ensured by design. Not production tested.
(2)
Tested as 80% minimum for the oscillator which is the equivalent of 40% for UC28025.