UC1854
UC2854
UC3854
Unless otherwise stated, VCC=18V, RSET=15k to ground, CT=1.5nF to ground, PKLMT=1V, ENA=7.5V,
VRMS=1.5V, IAC=100µA, ISENSE=0V, CA Out=3.5V, VA Out=5V, VSENSE=7.5V, no load on SS, CA Out,
VA Out, REF, GT Drv, –55oC<TA<125oC for the UC1854, –40oC<TA<85oC for the UC2854, and
0oC<TA<70oC for the UC3854, and TA=TJ.
ELECTRICAL
CHARACTERISTICS
PARAMETER
CURRENT AMPLIFIER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Current Amp Offset Voltage
ISENSE Bias Current
–4
–500
4
mV
nA
V
–120
500
Input Range, ISENSE, Mult Out
Current Amp Gain
–0.3 to 2.5
80
110
0.5 to 16
–20
dB
V
Current Amp Output Swing
Current Amp Short Circuit Current CA Out=0V
–36
400
–5
mA
kHz
Current Amp Gain-BW Product
REFERENCE
TA=25oC (Note 6)
IREF=0mA, TA=25oC
800
Reference Output Voltage
7.4
7.35
–15
–10
–50
7.5
7.5
5
7.6
7.65
15
V
IREF=0mA, Over Temp.
–10mA<IREF<0mA
15V<VCC<35V
V
VREF Load Regulation
VREF Line Regulation
VREF Short Circuit Current
MULTIPLIER
mV
mV
mA
2
10
REF=0V
–28
–12
Mult Out Current IAC Limited
Mult Out Current Zero
Mult Out Current RSET Limited
Mult Out Current
IAC=100µA, RSET=10k, VRMS=1.25V
IAC=0µA, RSET=15k
–220
–2.0
–280
–50
–200
–0.2
–255
–42
–180
2.0
µA
µA
µA
µA
µA
µA
µA
µA
V
IAC=450µA, RSET=15k, VRMS=1V, VA Out = 6V
IAC=50µA, VRMS=2V, VA=4V
IAC=100µA, VRMS=2V, VA=2V
IAC=200µA, VRMS=2V, VA=4V
IAC=300µA, VRMS=1V, VA=2V
IAC=100µA, VRMS=1V, VA=2V
(Note 5)
–220
–33
–38
–27
–12
–165
–250
–95
–150
–225
–80
–105
–150
–60
Multiplier Gain Constant
OSCILLATOR
–1.0
Oscillator Frequency
RSET=15k
RSET=8.2k
46
86
55
102
5.4
1.1
62
118
5.9
1.3
kHz
kHz
V
CT Ramp Peak-to-Valley Amplitude
CT Ramp Valley Voltage
GATE DRIVER
4.9
0.8
V
Maximum GT Drv Output Voltage 0mA load on GT Drv, 18V<VCC<35V
13
12
14.5
12.8
0.9
1.0
0.1
1.0
35
18
V
V
GT Drv Output Voltage High
GT Drv Output Voltage Low, Off
GT Drv Output Voltage Low
–200mA load on GT Drv, VCC=15V
VCC=0V, 50mA load on GT Drv
200mA load on GT Drv
10mA load on GT Drv
1.5
2.2
0.4
V
V
V
Peak GT Drv Current
GT Drv Rise/Fall Time
GT Drv Maximum Duty Cycle
CURRENT LIMIT
10nF from GT Drv to Gnd
1nF from GT Drv to Gnd
VCA Out=7V
A
ns
%
95
PKLMT Offset Voltage
PKLMT Input Current
PKLMT to GT Drv Delay
–10
10
mV
µA
ns
PKLMT=–0.1V
–200
–100
175
PKLMT falling from 50mV to –50mV
k × IAC × (VA Out−1)
IMult Out =
Note 5: Multiplier Gain Constant (k) is defined by:
2
VRMS
Note 6: Guaranteed by design. Not 100% tested in production.
3
TI [ TEXAS INSTRUMENTS ]
