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| 型号： | FSQ0765RQUDTU |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC CONV QUASI-RES 650V TO-220F-6 |
| 标准包装： | 400 |
| 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-220-6L（成形） |
| 包装： | 管件 |
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
that is t X , the next switching cycle starts after internal
I DS
t B =15 μ s
V DS
t X
I DS
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 within t B , the
other switching cycle follows classical QRC operation.
V sync
ingnore
4.4V
1.2V
1.0V
t B =15 μ s
t X
internal delay
FSQ0765R Rev. 00
Figure 27. After V sync Finds First Valley
I DS
V DS
I DS
4.4V
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,
switching is terminated and the SenseFET remains off.
This causes V CC to fall. When V CC falls down to the
V sync
internal delay
1.2V
1.0V
FSQ0765R Rev. 00
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
Figure 25. V sync > 4.4V at t X
not removed, the SenseFET remains off and V CC drops
to stop voltage again. In this manner, the auto-restart can
alternately enable and disable the switching of the power
t B =15 μ s
t X
SenseFET until the fault condition is eliminated.
Because these protection circuits are fully integrated into
the IC without external components, the reliability is
improved without increasing cost.
I DS
I DS
V DS
Power
on
Fault
occurs
Fault
removed
V DS
V CC
V sync
4.4V
1.2V
1.0V
12V
8V
internal delay
FSQ0765R Rev. 00
FSQ0765R Rev. 00
Normal
operation
Fault
situation
Normal
operation
t
Figure 26. V sync < 4.4V at t X
? 2008 Fairchild Semiconductor Corporation
FSQ0765RQ Rev. 1.0.1
13
Figure 28. Auto Restart Protection Waveforms
www.fairchildsemi.com
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