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參數(shù)資料
| 型號： | FSQ0765RQ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 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 |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 3321K |
| 代理商： | FSQ0765RQ |
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
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
that is 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 within 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSQ0765RQLDTU | 功能描述:電源開關(guān) IC - 配電 SMPS Power switch (QRC) 7A 650V RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FSQ0765RQUDTU | 功能描述:電源開關(guān) IC - 配電 SMPS Power SW (QRC) 7A 650V RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FSQ0765RQWDTU | 功能描述:電源開關(guān) IC - 配電 SMPS Power Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FSQ0765RS | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPS) for Quasi-Resonant Operation - Low EMI and High Efficiency |
| FSQ0765RSLDTU | 功能描述:電源開關(guān) IC - 配電 SMPS Power switch (QRC) 7A 650V RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時間（最大值）:400 us 關(guān)閉時間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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