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参数资料
| 型号： | FSQ0765RS |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, ZFM6 |
| 封装： | GREEN, TO-220F, 6 PIN |
| 文件页数： | 5/16页 |
| 文件大小： | 3224K |
| 代理商： | FSQ0765RS |
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
13
The switching frequency is the combination of blank time
(tB) and detection time window (tW). In case of a heavy
load, the sync voltage remains flat after tB and waits for
valley detection during tW. 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 Vsync remains flat higher than 4.4V at the end of tB
which is instant tX, the next switching cycle starts after
internal delay time from tX. In the second case, the next
switching occurs on the valley when the Vsync goes below
4.4V within tB. Once Vsync detects the first valley in tB, the
other switching cycle follows classical QRC operation.
Figure 25. Vsync > 4.4V at tX
Figure 26. Vsync < 4.4V at tX
Figure 27. After Vsync 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,
switching is terminated and the SenseFET remains off.
This causes VCC to fall. When VCC falls down to the
Under-Voltage Lockout (UVLO) stop voltage of 8V, the
protection is reset and the startup circuit charges the
VCC capacitor. When the VCC reaches the start voltage
of 12V, normal operation resumes. If the fault condition is
not removed, the SenseFET remains off and VCC drops
to stop voltage again. In this manner, the auto-restart can
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, the reliability is
improved without increasing cost.
Figure 28. Auto-Restart Protection Waveforms
t
B=15μs
I
DS
V
DS
V
sync
internal delay
I
DS
4.4V
1.2V
1.0V
t
X
FSQ0765R Rev. 00
t
B=15μs
I
DS
V
DS
V
sync
internal delay
I
DS
4.4V
1.2V
1.0V
t
X
FSQ0765R Rev. 00
t
B=15μs
I
DS
I
DS
V
DS
V
sync
internal delay
4.4V
1.2V
1.0V
ingnore
t
X
FSQ0765R Rev. 00
Fault
situation
8V
12V
V
CC
V
DS
t
Fault
occurs
Fault
removed
Normal
operation
Normal
operation
Power
on
FSQ0765R Rev. 00
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