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UCC3858 Datasheet

  • UCC3858

  • High Efficiency, High Power Factor Preregulator

  • 12頁

  • TI

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UCC1858
UCC2858
UCC3858
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply for T
A
= 0擄C to 70擄C for the
UCC3858, 鈥?0擄C to +85擄C for the UCC2858, and 鈥?5擄C to +150擄C for the UCC1858, V
VDD
= 12V, R
T
= 24k, C
T
= 330pF, R
FBM
=
96k, I
IAC
= 100碌A(chǔ), T
A
= T
J
.
PARAMETER
Current Amplifier
Input Offset Voltage
Input Bias Current
Input Offset Current
Open Loop Gain
CMRR
CAO High
CAO Low
Maximum Output Source Current
Voltage Reference
Output Voltage
I
REF
= 0mA, T
A
= 25擄C
Over Temperature, UCC3858
Over Temperature, UCC2858, UCC1858
Load Regulation
Line Regulation
Short Circuit Current
Oscillator
Initial Accuracy
Voltage Stability
Total Variation
Ramp Amplitude (p-p)
Ramp Peak Voltage
Peak Current Limit
PKLMT Threshold Voltage
PKLMT Hysteresis
PKLMT Propagation Delay
Multiplier Section
High Line, Low Power
High Line, High Power
Low Line, Low Power
Low Line, High Power
IAC Limited
Gain Constant
Zero Current
Power Limit (V
CRMS
鈥?/div>
I
MO
)
PWM Frequency Foldback
FBL Input Current
FBL Output Disable
Foldback Minimum Frequency
FBM Foldback Override
R
FBM
= 100k
鈥?00
鈥?00
0.5
25
1.5
30
1.75
nA
V
kHz
V
I
AC
= 100碌A(chǔ), V
CRMS
= 3.5V, VA
OUT
= 1.25V
I
AC
= 100碌A(chǔ), V
CRMS
= 3.5V, VA
OUT
= 5.5V
I
AC
= 20碌A(chǔ), V
CRMS
= 0.75V, VA
OUT
= 1.25V
I
AC
= 20碌A(chǔ), V
CRMS
= 0.75V, VA
OUT
= 5.5V
I
AC
= 20碌A(chǔ), V
CRMS
= 0.4V, VA
OUT
= 5.5V
I
AC
= 100碌A(chǔ), V
CRMS
= 3.5V, VA
OUT
= 5.5V
I
AC
= 20碌A(chǔ), V
CRMS
= 0.75V, VA
OUT
= 5.5V (Note 1)
I
AC
=100碌A(chǔ), V
CRMS
= 3.5V, VA
OUT
= 5.5V (Note 1)
I
AC
= 20碌A(chǔ), V
CRMS
= 0.75V, VA
OUT
= 5.5V
1
15
4
64
64
2.5
0
0
45
碌A(chǔ)
碌A(chǔ)
碌A(chǔ)
碌A(chǔ)
碌A(chǔ)
1/V
碌A(chǔ)
碌A(chǔ)
碌W
(V
CA
鈥?鈥揤
MOUT
350
450
100
1
550
200
mV
mV
碌s
T
A
= 25擄C
V
DD
= 12V to 16V
Line, Temperature
Oscillator Free Running, VAO = 5.5V
Oscillator Free Running, VAO = 5.5V
80
3.3
4.4
3.5
4.6
90
100
110
1
120
3.7
4.8
kHz
%
kHz
V
V
I
REF
= 0mA to 2mA
V
DD
= 12V to 16V
V
REF
= 0V
7.313
7.294
7.239
7.5
7.5
7.5
3
30
35
50
7.688
7.707
7.762
5
V
V
V
mV
mV
mA
V
CM
= 0V, V
CAO
= 3V
V
CM
= 0V, V
CAO
= 3V
V
CM
= 0V, V
CAO
= 3V
V
CM
= 0V, V
CAO
= 2V to 5V
V
CM
= 0V to 1.5V, V
CAO
= 3V
V
CA鈥?/div>
= 0V, V
MOUT
= 1V, I
L
= 鈥?0
碌
A
V
CA鈥?/div>
= 1V, V
MOUT
= 0V, I
L
= 1mA
鈥?30
鈥?
鈥?.5
鈥?.5
80
65
6.5
0
鈥?
0.0
90
80
7
0.2
鈥?50
7.5
0.3
0.5
3
mV
碌A(chǔ)
碌A(chǔ)
dB
dB
V
V
碌A(chǔ)
TEST CONDITIONS
MIN
TYP
MAX UNITS
3

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