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參數(shù)資料
| 型號： | FSGM0465RWDTU |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, ZFM6 |
| 封裝： | LEAD FREE, TO-220, 6 PIN |
| 文件頁數(shù)： | 3/18頁 |
| 文件大?。?/td> | 903K |
| 代理商： | FSGM0465RWDTU |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSGM0465R Rev. 1.0.2
11
FSGM
0465R
—
Green-
M
ode
Fairchild
Power
Swit
ch
(
F
PS)
4.3. Output-Short Protection (OSP): If the output is
shorted, steep current with extremely high di/dt can
flow through the SenseFET during the minimum turn-
on time. Such a steep current brings high-voltage
stress on the drain of the SenseFET when turned off.
To protect the device from this abnormal condition,
OSP is included. It is comprised of detecting VFB and
SenseFET turn-on time. When the VFB is higher than
2V and the SenseFET turn-on time is lower than
1.2μs, the FSGM0465R recognizes this condition as
an abnormal error and shuts down PWM switching
until VCC reaches VSTART again. An abnormal
condition output short is shown in Figure 22.
Figure 22. Output-Short Protection
4.4
Over-Voltage
Protection
(OVP):
If
the
secondary-side feedback circuit malfunctions or a
solder defect causes an opening in the feedback
path, the current through the opto-coupler transistor
becomes almost zero. Then VFB climbs up in a similar
manner to the overload situation, forcing the preset
maximum current to be supplied to the SMPS until
the overload protection is triggered. Because more
energy than required is provided to the output, the
output voltage may exceed the rated voltage before
the overload protection is triggered, resulting in the
breakdown of the devices in the secondary side. To
prevent this situation, an OVP circuit is employed. In
general, the VCC is proportional to the output voltage
and the FSGM0465R uses VCC instead of directly
monitoring the output voltage. If VCC exceeds 24.5V,
an OVP circuit is triggered, resulting in the
termination of the switching operation. To avoid
undesired activation of OVP during normal operation,
VCC should be designed to be below 24.5V.
4.5 Thermal Shutdown (TSD): The SenseFET and
the control IC on a die in one package makes it
easier for the control IC to detect the over
temperature of the SenseFET. If the temperature
exceeds ~140
°C, the thermal shutdown is triggered
and
the
FSGM0465R
stops
operation.
The
FSGM0465R operates in auto-restart mode until the
temperature decreases to around 110
°C, when
normal operation resumes.
5. Soft Burst-Mode Operation: To minimize power
dissipation in standby mode, the FSGM0465R enters
burst-mode operation. As the load decreases, the
feedback voltage decreases. As shown in Figure 23,
the device automatically enters burst mode when the
feedback voltage drops below VBURL (500mV). At this
point, switching stops and the output voltages start to
drop at a rate dependent on standby current load. This
causes the feedback voltage to rise. Once it passes
VBURH (700mV), switching resumes. At this point, the
drain current peak increases gradually. This soft burst-
mode can reduce audible noise during burst-mode
operation. The feedback voltage then falls and the
process repeats. Burst-mode operation alternately
enables and disables switching of the SenseFET,
thereby reducing switching loss in standby mode.
VFB
VDS
0.50V
0.70V
IDS
VO
t
Switching
disabled
t1
t2 t3
Switching
disabled
t4
t
Soft Burst
Figure 23. Burst-Mode Operation
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FSGM0565R | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPS?) |
| FSGM0565RB | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch |
| FSGM0565RBLDTU | 功能描述:電源開關(guān) IC - 配電 SMPS PWR SW, 5A 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 |
| FSGM0565RBUDTU | 功能描述:電源開關(guān) IC - 配電 SMPS PWR SW, 5A 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 |
| FSGM0565RBWDTU | 功能描述:電源開關(guān) IC - 配電 SMPS PWR SW, 5A 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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