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参数资料
| 型号： | FSGM0465RWDTU |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, ZFM6 |
| 封装： | LEAD FREE, TO-220, 6 PIN |
| 文件页数： | 2/18页 |
| 文件大小： | 903K |
| 代理商： | FSGM0465RWDTU |
2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FSGM0465R Rev. 1.0.2
10
FSGM
0465R
—
Green-
M
ode
Fairchild
Power
Swit
ch
(
F
PS)
4. Protection Circuits: The FSGM0465R has several
self-protective functions, such as Overload Protection
(OLP), Abnormal Over-Current Protection (AOCP),
Output-Short Protection (OSP), Over-Voltage Protection
(OVP),
and
Thermal
Shutdown (TSD). All the
protections are implemented as auto-restart. Once the
fault condition is detected, switching is terminated and
the SenseFET remains off. This causes VCC to fall.
When V
B
CC
B
falls to the Under-Voltage Lockout (UVLO)
stop voltage of 7.5V, the protection is reset and the
startup circuit charges the VCC capacitor. When VCC
reaches the start voltage of 12.0V, the FSGM0465R
resumes normal operation. 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 19. Auto-Restart Protection Waveforms
4.1 Overload Protection (OLP): Overload is defined
as the load current exceeding its normal level due to
an unexpected abnormal event. In this situation, the
protection circuit should trigger to protect the SMPS.
However, even when the SMPS is in normal
operation, the overload protection circuit can be
triggered during the load transition. To avoid this
undesired operation, the overload protection circuit is
designed to trigger only after a specified time to
determine whether it is a transient situation or a true
overload situation. Because of the pulse-by-pulse
current limit capability, the maximum peak current
through the SenseFET is limited and, therefore, the
maximum input power is restricted with a given input
voltage. If the output consumes more than this
maximum power, the output voltage (VOUT) decreases
below the set voltage. This reduces the current
through the opto-coupler LED, which also reduces
the opto-coupler transistor current, thus increasing
the feedback voltage (VFB). If VFB exceeds 2.4V, D1 is
blocked and the 3.3A current source starts to charge
CFB slowly up. In this condition, VFB continues
increasing until it reaches 6.0V, when the switching
operation is terminated, as shown in Figure 20. The
delay time for shutdown is the time required to charge
CFB from 2.4V to 6.0V with 3.3A. A 25 ~ 50ms delay
is typical for most applications. This protection is
implemented in auto-restart mode.
Figure 20. Overload Protection
4.2 Abnormal Over-Current Protection (AOCP):
When
the
secondary rectifier diodes or the
transformer pins are shorted, a steep current with
extremely high di/dt can flow through the SenseFET
during the minimum turn-on time. Even though the
FSGM0465R has overload protection, it is not
enough to protect the FSGM0465R in that abnormal
case; since severe current stress is imposed on the
SenseFET until OLP is triggered. The FSGM0465R
internal AOCP circuit is shown in Figure 21. When
the gate turn-on signal is applied to the power
SenseFET, the AOCP block is enabled and monitors
the current through the sensing resistor. The voltage
across the resistor is compared with a preset AOCP
level. If the sensing resistor voltage is greater than
the AOCP level, the set signal is applied to the S-R
latch, resulting in the shutdown of the SMPS.
Figure 21. Abnormal Over-Current Protection
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相关代理商/技术参数 |
参数描述 |
|---|---|
| FSGM0565R | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch (FPS?) |
| FSGM0565RB | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:Green-Mode Fairchild Power Switch |
| FSGM0565RBLDTU | 功能描述:电源开关 IC - 配电 SMPS PWR SW, 5A 650V RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSGM0565RBUDTU | 功能描述:电源开关 IC - 配电 SMPS PWR SW, 5A 650V RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| FSGM0565RBWDTU | 功能描述:电源开关 IC - 配电 SMPS PWR SW, 5A 650V RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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