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| 型号： | FSQ0765RSLDTU |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 16/19页 |
| 文件大小： | 0K |
| 描述： | IC PWM/SENSEFET QRC TO-220F-6L |
| 标准包装： | 400 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 48kHz ~ 67kHz |
| 输入电压： | 9 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 90W |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | TO-220-6 成形引线 |
| 供应商设备封装： | TO-220F-6L（L 型） |
| 包装： | 管件 |
8. AVS (Alternating Valley Switching): Due to the
I DS
t smax =21 μ s
t B =15 μ s
t s
I DS
t B =15 μ s
t s
I DS
I DS
A
B
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.
I DS
I DS
t B =15 μ s
I DS
t s
I DS
C
f s
67kHz
59kHz
53kHz
48kHz
Constant
frequency
CCM
Assume the resonant period is 2 μ s
AVS trigger point
Variable frequency within limited range
DCM
AVS region
1
15 μ s
1
17 μ s
1
19 μ s
1
21 μ s
t B =15 μ s
t W =6 μ s
D
D C
FSQ0765R Rev.00
B
A
V in
t s
max =21 μ s
FSQ0765R Rev. 00
Figure 42. QRC Operation with Limited Frequency
V gate
Figure 43. Switching Frequency Range
V gate continued 2 pulses
V gate continued another 2 pulses
V gate continued 2 pulses
GateX2
1st valley switching
2nd valley switching
1st valley switching
One-shot
fixed
fixed
fixed
fixed
fixed
fixed
AVS
triggering
1st or 2nd is depend on GateX2
de-triggering triggering
1st or 2nd is dependent on GateX2
V DS
t B
t B
t B
t B
t B
t B
GateX2 : Counting V gate every 2 pulses independent on other signals.
FSQ0765R Rev. 00
1st valley- 2nd valley frequency modulation.
Modulation frequency is approximately 17kHz.
Figure 44. Alternating Valley Switching (AVS)
? 2008 Fairchild Semiconductor Corporation
FSQ0765RS ? Rev. 1.0.2
16
www.fairchildsemi.com
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