Datasheet

UCC1806
UCC2806
UCC3806
SLUS272F -- FEBRUARY 2000 -- REVISED AUGUST 2006
4
www.ti.com
ELECTRICAL CHARACTERISTICS
V
IN
=12V,R
T
=33kΩ,C
T
= 330 pF, C
BYPASS
on V
REF
=0.01μF, -- 5 5°C<T
A
< 125°C for the UCC1806, --40°C<T
A
<85°Cforthe
UCC2806, 0°C<T
A
<70°C for the UCC3806, and T
A
=T
J
(unless otherwise noted)
PARAMETER
TEST CONDITIONS MIN TYP MAX UNIT
OSCILLATOR (continued)
I
DCHG
Discharge current T
J
=25°C, V
CT
=2.0V 2.5 mA
V
OL
Low-level output voltage, SYNC I
OUT
=1mA 0.4
V
OH
High-level output voltage, SYNC I
OUT
=--4mA 2.4
V
V
IL
Low-level input voltage, SYNC V
CT
=0V, V
RT
=V
REF
0.8
V
V
IH
High-level input voltage, SYNC V
CT
=0V, V
RT
=V
REF
2.0
I
SYNC
Input current, SYNC -- 1 1 μA
ERROR AMPLIFIER
In
p
ut o
f
f
set volta
g
e
UCC1806
UCC2806
5
m
V
I
n
p
u
t
o
f
f
s
e
t
v
o
l
t
a
g
e
UCC3806 10
m
V
I
BIAS
Input bias current -- 1 μA
I
OFSET
Input offset current 500 nA
CMR Common mode range
(1)
0 V
IN
-- 2 V
A
VOL
Open loop gain 1V≤ V
OUT
≤ 4V 80 100 dB
GBW bandwidth 1 MHz
I
COMP_SINK
Output sink current V
ID
<--20mV, V
COMP
=1V 1 mA
I
COMP_SRC
Output source current V
ID
<20mV, V
COMP
=3V -- 8 0 --120 μA
V
COMP_L
Low-level output voltage V
ID
=--50mV 0.5
V
V
COMP_H
High-level output voltage V
ID
=--50mV 4.5
V
CURRENT SENSE AMPLIFIER
A Amplifier gain
(3)(4)
V
CS--
=0V, V
CURLIM
=V
REF
2.75 3.00 3.35 V/V
Maximum differential input signal (V
CS+
-- V
CS--
)
V
CURLIM
=V
NI
=V
REF,
V
INV
=0V
1.1 V
In
p
ut o
f
f
set volta
g
e
UCC1806
UCC2806
V
CURLIM
=0.5V, V
COMP
= OPEN 10 30 mV
I
n
p
u
t
o
f
f
s
e
t
v
o
l
t
a
g
e
UCC3806 V
CURLIM
=0.5V, V
COMP
= OPEN 10 50 mV
CMRR Common mode rejection ratio 0V≤ V
CM
≤ (V
IN
-- 3 . 5 V ) 60 dB
PSRR Power supply rejection ratio 56 dB
I
BIAS
Input bias current
(3)
V
CURLIM
=0.5V, V
COMP
= OPEN -- 1 μA
Input offset current
(3)
V
CURLIM
=0.5V, V
COMP
= OPEN 1 μA
Delay-to-output time
(5)
V
NI
=V
REF,
V
INV
=0V,
V
CURLIM
=2.75V,
(V
CS+
-- V
CS--
)= 0Vto1.5Vstep
125 175 ns
CURRENT LIMIT ADJUST
Current limit offset V
CS--
=V
CS+
=0V, V
COMP
= OPEN 0.4 0.5 0.6 V
I
BIAS
Input bias current 1
Minimum latching current 300 200
μA
Maximum non-latching current 200 80
μ
A
(1)
Line range = 10 V to 15 V, load range = 0.2 mA to 5 mA
(2)
Ensured by design. Not production tested.