參數(shù)資料
型號： UCC2888
廠商： Texas Instruments, Inc.
英文描述： Off-line Power Supply Controller
中文描述： 脫機(jī)電源控制器
文件頁數(shù)： 4/6頁
文件大?。?/td> 299K
代理商： UCC2888
ADJ:
The ADJ pin is used to provide a 5V regulated sup-
ply without additional external components. Other output
voltages can be obtained by connecting a resistor divider
between V
OUT
, ADJ and GND. Use the formula
V
OUT
=
2.5V
R1
+
R2
R2
where R1 is connected between V
OUT
and ADJ, and R2
is connected between ADJ and GND. R1 || R2 should be
less than 1k
to minimize the effect of the temperature
coefficient of the internal 30k resistors which also connect
to V
OUT
, ADJ, and GND. See Block Diagram.
C
T
(timing capacitor):
The signal voltage at C
T
has a
peak-to-peak swing of 3.7V for 9V V
CC
. As the voltage at
C
T
crosses the oscillator upper threshold, DRIVE goes
low. As the voltage on C
T
crosses the oscillator lower
threshold, DRIVE goes high.
DRIVE:
This output is a CMOS stage capable of sinking
200mA peak and sourcing 150mA peak. The output volt-
age swing is 0 to V
CC
.
GND (chip ground):
All voltages are measured with re-
spect to GND.
T
OFF
(regulated output control):
T
OFF
sets the dis-
charge current of the timing capacitor through an external
resistor connected between V
OUT
and T
OFF
.
T
ON
(line voltage control):
T
ON
serves three functions.
When C
T
is discharging (off time), the current through
T
ON
is routed to V
CC.
When C
T
is charging (on time), the
current through T
ON
is split 80% to set the C
T
charge
time and 20% to sense minimum line voltage which oc-
curs for a T
ON
current of 220
μ
A. For a minimum line volt-
age of 80V, R
ON
is 330k
.
The C
T
voltage slightly affects the value of the charge
current during the on time. During this time, the voltage at
the T
ON
pin increases from 2.5V to 6.5V.
V
CC
(chip supply voltage):
The supply voltage of the
device at pin V
CC
is internally clamped at 9V. The device
needs an external supply, from a source such as the rec-
tified AC line or derived from the switching circuit. Pre-
cautions must be taken to ensure that total I
CC
does not
exceed 8mA.
V
OUT
(regulated output):
The V
OUT
pin is directly con-
nected to the power supply output voltage. When V
OUT
is
greater than V
CC
, V
OUT
bootstraps V
CC
.
UCC1888
UCC2888
UCC3888
PIN DESCRIPTIONS
BLOCK DIAGRAM
UDG-96015
4
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