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參數(shù)資料
| 型號(hào)： | FSQ0765RQ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 3.92 A SWITCHING CONTROLLER, 75.8 kHz SWITCHING FREQ-MAX, ZFM6 |
| 封裝： | ROHS COMPLIANT, TO-220F, 6 PIN |
| 文件頁(yè)數(shù)： | 8/19頁(yè) |
| 文件大?。?/td> | 3321K |
| 代理商： | FSQ0765RQ |
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F
S
Q0
765RQ
—
Green
-Mode
Farich
ild
P
o
we
rSw
itch
(FPS)
for
Quasi
-Resonant
Operatio
n
2008 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSQ0765RQ Rev. 1.0.1
16
If no valley is found during tW, the internal SenseFET is
forced to turn on at the end of tW (Case D). Therefore,
the devices have a minimum switching frequency of
48kHz and a maximum switching frequency of 67kHz.
Figure 34. 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 35, the switching
frequency hops when the input voltage is high. The
internal timing diagram of AVS is described in Figure 36.
Figure 35. Switching Frequency Range
Figure 36. 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
V
in
Assume the resonant period is 2us
f
s
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
1st or 2nd is dependent on GateX2
2nd valley switching
1st valley switching
Vgate
GateX2
GateX2: Counting Vgate every 2 pulses independent on other signals.
One-shot
AVS
fixed
triggering
fixed
de-triggering
tB
VDS
tB
Vgate continued 2 pulses
Vgate continued another 2 pulses
1st valley switching
tB
1st valley- 2nd valley frequency modulation.
Modulation frequency is approximately 17kHz.
Vgate continued 2 pulses
1st or 2nd is depend on GateX2
S
ync
hr
on
iz
e
Syn
ch
roni
ze
FSQ0765R Rev. 00
tB
triggering
fixed
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| FSQ0765RS | 制造商:FAIRCHILD 制造商全稱(chēng):Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPS) for Quasi-Resonant Operation - Low EMI and High Efficiency |
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