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參數(shù)資料
| 型號(hào)： | UCC81510N |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Transition-mode PFC controller |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 5/10頁(yè) |
| 文件大?。?/td> | 196K |
| 代理商： | UCC81510N |
SLUS457B – JULY 2000 - REVISED OCTOBER 2000
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
9
8
5
4
13
12
10
6
7
3
2
1
16
15
14
VIN
VIN
VIN
VOUT
VOUT
VOUT
SHTDWN
FAULT
CT
HEAT SINK GND
PINS
GND
IFAULT
IMAX
R
IMAX
R
IFAULT
C
T
C
SD
R
SD
V
IN
S6
R
L
C
OUT
V
OUT
C
IN
D1
R1
V
IN
UDG–00102
Figure 1. Typical Application
protecting the UCC2918 from voltage transients
The parasitic inductance associated with the power distribution can cause a voltage spike at V
IN
if the load
current is suddenly interrupted by the UCC2918. It is important to limit the peak of this spike to less than 6 V
to prevent damage to the UCC2918 This voltage spike can be minimized by:
Reducing the power distribution inductance (e.g., twist the positive + and negative – leads of the power
supply feeding V
IN
, locate the power supply close to the UCC2918 or use a PCB ground plane).
Decoupling V
IN
with a capacitor, C
IN
(refer to Figure 1), located close to the VIN pin. This capacitor is
typically less than 1
μ
F to limit the inrush current.
Clamping the voltage at V
IN
below 6 V with a Zener diode, D1 (refer to Figure 1), located close to the VIN
pin.
estimating maximum load capacitance
For circuit breaker applications, the rate at which the total output capacitance can be charged depends on the
maximum output current available and the nature of the load. For a constant-current current-limited circuit
breaker, the output comes up if the load requires less than the maximum available short-circuit current.
To ensure recovery of a duty-cycle of the current-limited circuit breaker from a short-circuited load condition,
there is a maximum total output capacitance that can be charged for a given unit ON time (fault time). The design
value of ON or fault time can be adjusted by changing the timing capacitor C
T
.
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