Datasheet

Supply Voltage V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
GT Drv Current, Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A
GT Drv Current, 50% Duty Cycle. . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Input Voltage, V
SENSE
, V
RMS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11V
Input Voltage, I
SENSE
, Mult Out . . . . . . . . . . . . . . . . . . . . . . . . . . . 11V
Input Voltage, PKLMT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Input Current, R
SET
, I
AC
, PKLMT, ENA . . . . . . . . . . . . . . . . . . . 10mA
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature . . . . . . . . . . . . . . . . . . . . –65
o
C to +150
o
C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . . . . . +300
o
C
ABSOLUTE MAXIMUM RATINGS
PACKAGE PIN FUNCTION
FUNCTION PIN
N/C 1
Gnd 2
PKLMT 3
CA Out 4
I
SENSE
5
N/C 6
Mult Out 7
I
AC
8
VA Out 9
V
RMS
10
N/C 11
V
REF
12
ENA 13
V
SENSE
14
R
SET
15
N/C 16
SS 17
C
T
18
V
CC
19
GT Drv 20
PLCC-20 & LCC-20
(Top View)
Q & L Packages
CONNECTION DIAGRAMS
DIL–16 & SOIC-16
(Top View)
J, N & DW Packages
Unless otherwise stated, V
CC
=18V, R
SET
=15k to ground, C
T
=1.5nF to ground, PKLMT=1V, ENA=7.5V,
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
.
ELECTRICAL
CHARACTERISTICS
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
OVERALL
Supply Current, Off ENA=0V 1.5 2.0 mA
Supply Current, On 10 16 mA
V
CC
Turn-On Threshold 14.5 16 17.5 V
V
CC
Turn-Off Threshold 9 10 11 V
ENA Threshold, Rising 2.4 2.55 2.7 V
ENA Threshold Hysteresis 0.2 0.25 0.3 V
ENA Input Current ENA=0V –5.0 –0.2 5.0 µA
V
RMS
Input Current V
RMS
=5V –1.0 –.01 1.0 µA
VOLTAGE AMPLIFIER
Voltage Amp Offset Voltage VA Out=5V –8 8 mV
V
SENSE
Bias Current –500 –25 500 nA
Voltage Amp Gain 70 100 dB
Voltage Amp Output Swing 0.5 to 5.8 V
Voltage Amp Short Circuit Current VA Out=0V –36 –20 –5 mA
SS Current SS=2.5V –20 –14 –6 µA
UC1854
UC2854
UC3854
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-
2