UCC1858 Unitrode Semiconductor, UCC1858 Datasheet - Page 2

• Manufacturer Part Number: UCC1858
• Description: High Efficiency, High Power Factor Preregulator
• Manufacturer: Unitrode Semiconductor

DESCRIPTION (cont.)
extracted from the current error amplifier input to provide
a cycle-by-cycle peak current limit. Low startup and op-
erating currents which are achieved through the use of
Unitrode’s BCDMOS process simplify the bootstrap sup-
ply design as well as minimize losses in the control cir-
cuit. A transconductance voltage error amplifier allows
output voltage sensing for internal overvoltage protec-
tion.
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:
UCC3858, –40°C to +85°C for the UCC2858, and –55°C to +150°C for the UCC1858, VDD = 12V, RT = 24k, CT = 330pF, R
IAC = 100 A, T
Overall
Voltage Amplifier
Current Amplifier
Voltage Reference
Supply Current, Off
Supply Current, On
VDD Turn-On Threshold
VDD Turn-Off Threshold
UVLO Hysteresis
Input Voltage
Over Voltage Protection
VA– Bias Current
Open Loop Gain
VAO High
VAO Low
Output Source Current
Output Sink Current
Transconductance
Input Offset Voltage
Input Bias Current
Input Offset Current
Open Loop Gain
CMRR
CAO High
CAO Low
Maximum Output Source Current
Maximum Output Sink Current
Gain Bandwidth Product
Output Voltage
A
= T
PARAMETER
J
.
Unless otherwise stated, these specifications apply for T
CAO, VAO = 0V, VDD = UVLO – 0.3V
T
V
Load = –50 A
V
V
V
V
V
V
V
V
V
I
Over Temperature, UCC3858
Over Temperature, UCC2858, UCC1858
Load = 50 A
REF
A
OUT
VA-
VA-
CM
CM
CM
CM
CM
CA–
CA–
= 25°C
= 0V, V
= 0V, V
= 0V, V
= 0V, V
= 0V to 1.5V, V
= 0mA, T
= 2.8V
= 3.2V
= 0V, V
= 1V, V
= 2V to 5V
CAO
CAO
CAO
CAO
MOUT
MOUT
TEST CONDITIONS
A
2
= 25°C
= 3V
= 3V
= 3V
= 2V to 5V
Unless otherwise indicated, voltages are reference to ground
and currents are positive into, negative out of the specified ter-
minal. 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 pack-
ages.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage V
Gate Drive Current
Input Voltage, CA–, MOUT, VA- . . . . . . . . . . . . . . . . . . . . . 11V
Input Current IAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA
Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature. . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . 55°C to +150°C
Lead Temperature (Soldering, 10 Sec.) . . . . . . . . . . . . +300°C
= 1V
= 0V
CAO
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.2A
Pulsed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mA
= 3V
DD
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V
9
2.95
3.1
–3
3
7.387
7.368
7.313
A
MIN
= 0°C to 70°C for the
60
3.5
13.75
10
TBD
3
3.15
1
60
6
0.3
–50
50
500
0
5
0.5
90
80
6
0.2
–150
1
5
7.5
7.5
7.5
TYP
15.5
3.05
3.2
0.5
3
7.6
7.631
7.687
MAX UNITS
UCC1858
UCC2858
UCC3858
FBM
mA
V
V
V
V
V
dB
V
V
mV
dB
dB
V
V
mA
MHz
V
V
V
= 96k,
A
A
A
A
S
A
A
A