UC1854
UC2854
UC3854
ABSOLUTE MAXIMUM RATINGS
Supply Voltage V
CC
. . . . . . . . . . . . . . . . . . . .
GT Drv Current, Continuous . . . . . . . . . . . . .
GT Drv Current, 50% Duty Cycle. . . . . . . . . .
Input Voltage, V
SENSE
, V
RMS
. . . . . . . . . . . . .
Input Voltage, I
SENSE
, Mult Out . . . . . . . . . . .
Input Voltage, PKLMT . . . . . . . . . . . . . . . . . .
Input Current, R
SET
, I
AC
, PKLMT, ENA . . . . .
Power Dissipation . . . . . . . . . . . . . . . . . . . . .
Storage Temperature . . . . . . . . . . . . . . .
Lead Temperature (Soldering, 10 Seconds) .
. . . . . . . . . . . . . . . . 35V
. . . . . . . . . . . . . . . 0.5A
. . . . . . . . . . . . . . . 1.5A
. . . . . . . . . . . . . . . . 11V
. . . . . . . . . . . . . . . . 11V
. . . . . . . . . . . . . . . . . 5V
. . . . . . . . . . . . . . 10mA
. . . . . . . . . . . . . . . . 1W
. . . . . –65
o
C to +150
o
C
. . . . . . . . . . . . . +300
o
C
Note 1: All voltages with respect to Gnd (Pin 1).
Note 2: All currents are positive into the specified termi-
nal.
Note 3: ENA input is internally clamped to approximately
14V.
Note 4: Consult Unitrode Integrated Circuits databook for
information regarding thermal specifications and limita-
CONNECTION DIAGRAMS
DIL–16 & SOIC-16
(Top View)
J, N & DW Packages
PLCC-20 & LCC-20
(Top View)
Q & L Packages
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C
Gnd
PKLMT
CA Out
I
SENSE
N/C
Mult Out
I
AC
VA Out
V
RMS
N/C
V
REF
ENA
V
SENSE
R
SET
N/C
SS
C
T
V
CC
GT Drv
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Unless otherwise stated, V
CC
=18V, R
SET
=15k to ground, C
T
=1.5nF to ground, PKLMT=1V, ENA=7.5V,
ELECTRICAL
CHARACTERISTICS
V
RMS
=1.5V, I
AC
=100
µ
A, I
SENSE
=0V, CA Out=3.5V, VA Out=5V, V
SENSE
=7.5V, no load on SS, CA Out,
VA Out, REF, GT Drv, –55
o
C<T
A
<125
o
C for the UC1854, –40
o
C<T
A
<85
o
C for the UC2854, and
0
o
C<T
A
<70
o
C for the UC3854, and T
A
=T
J
.
TEST CONDITIONS
ENA=0V
14.5
9
2.4
0.2
–5.0
–1.0
–8
–500
70
–36
–20
MIN
TYP
1.5
10
16
10
2.55
0.25
–0.2
–.01
MAX
2.0
16
17.5
11
2.7
0.3
5.0
1.0
8
500
PARAMETER
OVERALL
Supply Current, Off
Supply Current, On
V
CC
Turn-On Threshold
V
CC
Turn-Off Threshold
ENA Threshold, Rising
ENA Threshold Hysteresis
ENA Input Current
V
RMS
Input Current
VOLTAGE AMPLIFIER
Voltage Amp Offset Voltage
V
SENSE
Bias Current
Voltage Amp Gain
UNITS
mA
mA
V
V
V
V
µA
µA
mV
nA
dB
V
mA
µA
ENA=0V
V
RMS
=5V
VA Out=5V
–25
100
0.5 to 5.8
–20
–14
Voltage Amp Output Swing
Voltage Amp Short Circuit Current VA Out=0V
SS Current
SS=2.5V
–5
–6
2
TI [ TEXAS INSTRUMENTS ]
