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參數(shù)資料
| 型號： | UCC18502 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | BiCMOS PFC/PWM Combination Controller |
| 中文描述： | 的BiCMOS PFC / PWM組合控制器 |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 91K |
| 代理商： | UCC18502 |
UCC18500/1/2/3
UCC28500/1/2/3
UCC38500/1/2/3
PRELIMINARY
DESCRIPTION
The UCC18500 family provides all of the functions necessary for an ac-
tive power factor corrected preregulator and a second stage DC-to-DC
converter. The controller achieves near-unity power factor by shaping
the AC input line current waveform to correspond to the AC input line
voltage using average current mode control. The DC-to-DC converter
uses peak current mode control to perform the step down power con-
version.
The PFC stage is leading edge modulated while the second stage is
trailing edge synchronized to allow for minimum overlap between the
boost and PWM switches. This reduces ripple current in the bulk output
capacitor.
In order to operate with a three to one range of input line voltages, a
line feedforward (V
FF
) in used to keep input power constant with vary-
ing input voltage. Generation of V
FF
is done using I
AC
in conjunction
with an external single pole filter. This not only reduces external parts
count, but avoids the use of high voltage components offering a lower
cost solution. The multiplier then divides the line current by the square
of V
FF
.
(continued)
BiCMOS PFC/PWM Combination Controller
FEATURES
Combines PFC and 2
nd
Stage Down
Converter Function
Controls Boost PWM to Near-unity Power
Factor
Accurate Power Limiting
Average Current Mode Control in PFC
Stage
Peak Current Mode Control in Second
Stage
Programmable Oscillator
Leading Edge/Trailing Edge Modulation
for Reduced Output Ripple Using
SmartSync
Low Startup Supply Current
Synchronized Second Stage Start-up,
with Programmable Soft-start
Programmable Second Stage Shut-down
SLUS419 - AUGUST 1999
VREF
20
14
12
11
9
4
17
16
GT1
PWRGND
ISENSE1
VCC
OVP/ENBL
VAOUT
1.5V
PKLMT
7.5V
REFERENCE
UVLO
16V/10
+
–
VCC
15
OSCILLATOR
2
RT
5
CT
S
Q
R
PWM
LATCH
–
+
CAOUT
+
–
+
–
+
–
SS2
VOLTAGE
ERROR AMP
8.0V
13
1
3
VSENSE
VFF
19
IAC
18
MOUT
MIRROR
2:1
+
–
7.5V
ENABLE
PFCOVP
÷
X
X
MULT
CLK1
CURRENT AMP
6.75V
6
GND
10
GT2
VCC
7
8
SECOND STAGE
SOFT START
CLK2
1.5V 1.3V
R
I
LIMIT
CLK2
OSC
CLK1
CLK2
VERR ISENSE2
I
LIMIT
S
Q
R
R
UVLO2
PWM
+
–
0.25V
(V
FF
)
2
ZERO
POWER
BLOCK DIAGRAM
UDG-98189
相關PDF資料 |
PDF描述 |
|---|---|
| UCC18503 | BiCMOS PFC/PWM Combination Controller |
| UCC28502 | BiCMOS PFC/PWM Combination Controller |
| UCC1858 | High Efficiency, High Power Factor Preregulator |
| UCC1884 | Frequency Foldback Current Mode PWM Controller |
| UCC2884 | Frequency Foldback Current Mode PWM Controller |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UCC18503 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BiCMOS PFC/PWM Combination Controller |
| UCC1857 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Isolated Boost PFC Preregulator Controller |
| UCC1858 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High Efficiency, High Power Factor Preregulator |
| UCC1858DW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Factor Controller |
| UCC1858DWTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Power Factor Controller |
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