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UCC3858 Datasheet

  • UCC3858

  • High Efficiency, High Power Factor Preregulator

  • 345.11KB

  • 12頁

  • TI

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ABSOLUTE MAXIMUM RATINGS
Supply Voltage V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
Gate Drive Current
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2A
Pulsed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA
Input Current IAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA
Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature . . . . . . . . . . . . . . . . . . .
鈭?5擄C
to +150擄C
Junction Temperature . . . . . . . . . . . . . . . . . . .
鈭?5擄C
to +150擄C
Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . . +300擄C
Analog Inputs
Maximum Forced Voltage . . . . . . . . . . . . . . . . 鈥?.3V to 11V
Unless otherwise indicated, voltages are reference to ground and cur-
rents are positive into, negative out of the specified terminal. Pulsed is
defined as a less than 10% duty cycle with a maximum duration of
500ns. Consult Packaging Section of Databook for thermal limitations
and considerations of packages.
CONNECTION DIAGRAM
DIP-16, SOIC-16 (TOP VIEW)
J, N, DW Packages
IAC
CRMS
MOUT
VREF
CA鈥?/div>
CAO
VA鈥?/div>
VAO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
OUT
VDD
RT
CT
FBM
SYNC
FBL
UCC1858
UCC2858
UCC3858
DESCRIPTION (cont.)
Controller improvements include an onboard peak detec-
tor for the input line RMS voltage, an integrated
overcurrent shutdown, overvoltage shutdown and signifi-
cantly lower quiescent operating current. The peak de-
tector eliminates an external 2-pole low pass filter for
RMS detection. This simplifies the converter design as
well as providing an approximate 6X improvement in in-
put line transient response. The current signal is ex-
tracted from the current error amplifier input to provide a
cycle-by-cycle peak current limit. Low startup and oper-
ating currents which are achieved through the use of
Unitrode鈥檚 BCDMOS process simplify the bootstrap
supply design as well as minimize losses in the control
circuit. A transconductance voltage error amplifier allows
output voltage sensing for internal overvoltage protection.
Additional features include: undervoltage lockout for reli-
able off-line startup, a precision 7.5V reference, and a
precision RMS detection and signal conditioning circuit.
Chip shutdown can be attained by bringing the FBL pin
below 0.5V.
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
Overall
Supply Current, Off
Supply Current, On
VDD Turn-On Threshold
VDD Turn-Off Threshold
UVLO Hysteresis
Voltage Amplifier
Input Voltage
Over Voltage Protection
VA鈥?Bias Current
Open Loop Gain
VAO High
VAO Low
Output Source Current
Output Sink Current
Transconductance
V
OUT
= 2V to 5V
Load = 鈥?5碌A(chǔ)
Load = 25碌A(chǔ)
V
VA
鈥?= 2.8V
V
VA
鈥?= 3.2V
I
OUT
=
鹵
50
碌
A
50
400
600
1000
45
5.7
T
A
= 25擄C
Volts Above VA鈥?Input Voltage
2.95
0.12
3
0.14
鈥?.5
50
6
0.3
6.3
0.5
鈥?0
3.05
0.16
鈥?
V
V
碌A(chǔ)
dB
V
V
碌A(chǔ)
碌A(chǔ)
碌S
3.2
V
CAO
, V
VAO
= 0V, V
DD
= UVLO 鈥?0.3V
FBL = 0V
2
12
100
3.5
13.5
10
3.5
3.8
250
5
15.5
碌A(chǔ)
mA
V
V
V
TEST CONDITIONS
MIN
TYP
MAX UNITS
2

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