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| 型号： | FSQ0465RUWDTU |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC SWIT PWM GREEN UVLO HV TO220F |
| 产品变化通告： | Product Discontinuation 27/Feb/2012 |
| 标准包装： | 400 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 59.6kHz ~ 75.8kHz |
| 输入电压： | 8.5 V ~ 21 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 60W |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | TO-220FL |
| 供应商设备封装： | TO-220F-6L（成形） |
| 包装： | 管件 |
| 产品目录页面： | 1222 (CN2011-ZH PDF) |
The switching frequency is the combination of blank time
(t B ) and detection time window (t W ). In case of a heavy
load, the sync voltage remains flat after t B and waits for
valley detection during t W . This leads to a low switching
frequency not suitable for heavy loads. To correct this
drawback, additional timing is used. The timing
conditions are described in Figures 25, 26, and 27. When
the V sync remains flat higher than 4.4V at the end of t B
which is instant t X , the next switching cycle starts after
I D S
t B =15μs
V DS
t X
I DS
internal delay time from t X . In the second case, the next
switching occurs on the valley when the V sync goes below
4.4V within t B . Once V sync detects the first valley in t B , the
other switching cycle follows classical QRC operation.
V sync
ingnore
4.4V
1.2V
1.0V
t B =15μs
t X
internal delay
FS Q 0465 R ev.00
I DS
V DS
I DS
Figure 27. After V sync Finds First Valley
4. Protection Circuits : The FSQ-series has several self-
protective functions, such as Overload Protection (OLP),
Abnormal Over-Current Protection (AOCP), Over-
Voltage Protection (OVP), and Thermal Shutdown
(TSD). All the protections are implemented as auto-
restart mode. Once the fault condition is detected,
4.4V
V sync
1.2V
1.0V
FSQ 0465 Rev.00
internal delay
Figure 25. V sync > 4.4V at t X
switching is terminated and the SenseFET remains off.
This causes V CC to fall. When V CC falls down to the
Under-Voltage Lockout (UVLO) stop voltage of 8V, the
protection is reset and the startup circuit charges the
V CC capacitor. When the V CC reaches the start voltage
of 12V, normal operation resumes. If the fault condition is
not removed, the SenseFET remains off and V CC drops
to stop voltage again. In this manner, the auto-restart can
t B =15μs
t X
alternately enable and disable the switching of the power
SenseFET until the fault condition is eliminated.
Because these protection circuits are fully integrated into
the IC without external components, reliability is
improved without increasing cost.
I DS
I DS
V DS
Power
on
Fault
occurs
Fault
rem oved
V DS
4.4V
V CC
V sync
1.2V
1.0V
12V
internal delay
FSQ0465 Rev.00
8V
t
Figure 26. V sync < 4.4V at t X
FSQ0465 Rev.00
Norm al
operation
Fault
situation
Norm al
operation
Figure 28. Auto Restart Protection Waveforms
? 2009 Fairchild Semiconductor Corporation
FSQ0465RU Rev. 1.0.0
13
www.fairchildsemi.com
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