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參數(shù)資料
| 型號： | M30218FCFP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 16-BIT, FLASH, 10 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | PLASTIC, QFP-100 |
| 文件頁數(shù)： | 8/19頁 |
| 文件大小： | 2576K |
| 代理商： | M30218FCFP |
F
S
Q0
765RS
—
Green-Mo
de
F
airchild
P
o
wer
Sw
itch
(FPS)
for
Qu
asi-Re
sonant
Operation
2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSQ0765RS Rev. 1.0.0
16
Figure 33. QRC Operation with Limited Frequency
8. AVS (Alternating Valley Switching): Due to the
quasi-resonant operation with limited frequency, the
switching frequency varies depending on input voltage,
load transition, and so on. At high input voltage, the
switching on time is relatively small compared to low
input voltage. The input voltage variance is small and the
switching-frequency modulation width becomes small. To
improve the EMI performance, AVS is enabled when
input voltage is high and the switching on time is small.
Internally, quasi-resonant operation is divided into two
categories; one is first valley switching and the other is
second-valley switching after blanking time. In AVS, two
successive occurrences of first-valley switching and the
other two successive occurrences of second-valley
switching is alternatively selected to maximize frequency
modulation. As depicted in Figure 34, the switching
frequency hops when the input voltage is high. The
internal timing diagram of AVS is described in Figure 35.
Figure 34. Switching Frequency Range
Figure 35. Alternating Valley Switching (AVS)
t
s
max=21
μs
t
s
max=21
μs
t
B=15μs
t
s
t
B=15μs
t
s
t
s
I
DS
I
DS
I
DS
I
DS
I
DS
I
DS
I
DS
I
DS
A
B
C
D
t
W=6μs
t
B=15μs
t
B=15μs
FSQ0765R Rev. 00
53kHz
67kHz
59kHz
Constant
frequency
Vin
Assume the resonant period is 2 s
fs
s
μ
21
1
s
μ
15
1
s
μ
17
1
AVS trigger point
48kHz
s
19
1
μ
AVS region
CCM
DCM
Variable frequency within limited range
DB
CA
FSQ0765R Rev.00
μ
1st or 2nd is dependent on GateX2
2nd valley switching
1st valley switching
V
gate
GateX2
GateX2: Counting V
gate every 2 pulses independent on other signals.
One-shot
AVS
fixed
triggering
fixed
de-triggering
t
B
t
B
V
DS
t
B
V
gate continued 2 pulses
V
gate continued another 2 pulses
1st valley switching
t
B
t
B
1st valley- 2nd valley frequency modulation.
Modulation frequency is approximately 17kHz.
V
gate continued 2 pulses
1st or 2nd is depend on GateX2
S
yn
chr
onize
S
ynch
ron
iz
e
FSQ0765R Rev. 00
t
B
triggering
fixed
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