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參數(shù)資料
| 型號： | UCC2857 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Isolated Boost PFC Preregulator Controller |
| 中文描述： | 隔離升壓PFC前置穩(wěn)壓器控制器 |
| 文件頁數(shù)： | 2/10頁 |
| 文件大?。?/td> | 127K |
| 代理商： | UCC2857 |
2
UCC1857
UCC2857
UCC3857
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (VIN, VD). . . . . . . . . . . . . . . . . . . . . . 18V
General Analog/Logic Inputs
(CRMS, MOUT, CA–, VA–, CT, RT, PKLMT)
(Maximum Forced Voltage). . . . . . . . . . . . . . . . –0.3V to 5V
IAC (Maximum Forced Current) . . . . . . . . . . . . . . . . . . . 300
μ
A
Reference Output Current . . . . . . . . . . . . . . . Internally Limited
Output Current (MOSDRV, IGDRV1, IGDRV2)
Pulsed. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Continuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200mA
Storage Temperature . . . . . . . . . . . . . . . . . . .
65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . . . . . .
55°C to +150°C
Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . . +300°C
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 500 s. Consult Packaging Section of
Databook for thermal limitations and considerations of pack-
ages.
3
18
17
16
IAC
1
2
20 19
15
14
4
5
6
7
8
9
11
10
12 13
CRMS
MOUT
CT
RT
IGDRV2
PGND
IGDRV1
VD
MOSDRV
VIN
VREF
AGND
CA–
CAO
PKLMT
DELAY
VAO
SS
VA–
DESCRIPTION (continued)
Controller improvements include an internal 6 bit A-D
converter for RMS input line voltage detection, a zero
load power circuit, and significantly lower quiescent op-
erating current. The A-D converter eliminates an external
2 pole low pass filter for RMS detection.
This simplifies the converter design, eliminates 2nd har-
monic ripple from the feedforward component, and pro-
vides an approximate 6 times improvement in input line
transient response. The zero load power comparator
prevents energy transfer during open load conditions
without compromising power factor at light loads. Low
startup and operating currents which are achieved
through the use of Unitrode's BCDMOS process simplify
the auxiliary bootstrap supply design.
Additional features include: under voltage lockout for reli-
able off-line startup, a programmable over current shut-
down, an auxiliary shutdown port, a precision 7.5V
reference, a high amplitude oscillator ramp for improved
noise immunity, softstart, and a low offset analog square,
multiple and divide circuit. Like previous Unitrode PFC
controllers, worldwide operation without range switches
is easily implemented.
IGDRV2
RT
CT
PGND
IGDRV1
MOSDRV
VD
PKLMT
1
2
3
4
5
6
7
8
20
19
18
17
16
15
14
13
CRMS
IAC
CAO
AGND
CA–
MOUT
VIN
VREF
9
10
VA–
SS
DELAY
VAO
12
11
CONNECTION DIAGRAMS
DIL-20, SOIC- 20 (Top View)
J, N and DW Packages
PLCC-20 (Top View)
L Package
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