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参数资料
| 型号： | FSD146MRBN |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC FPS POWER SWITCH 650V 8-MDIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 61kHz ~ 73kHz |
| 输入电压： | 13 V ~ 23 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 35W |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
B B
4. Protection Circuits : The FSD146MRBN 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 V CC to fall.
When V CC falls to the Under-Voltage Lockout (UVLO)
stop voltage of 7.5V, the protection is reset and the
startup circuit charges the V CC capacitor. When V CC
reaches the start voltage of 12.0V, the FSD146MRBN
resumes normal operation. If the fault condition is 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 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.
continues increasing until it reaches 7.0V, when the
switching operation is terminated, as shown in Figure
20. The delay for shutdown is the time required to
charge C FB from 2.5V to 7.0V with 2.0μA. A 25 ~
50ms delay is typical for most applications. This
protection is implemented in auto-restart mode.
V DS
Power
on
Fault
occurs
Fault
removed
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
V CC
12.0V
7.5V
t
Normal Fault Normal
operation situation operation
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, in normal operation, the overload protection
circuit can be triggered during the load transition. To
FSD146MRBN has overload protection, it is not
enough to protect the FSD146MRBN in that abnormal
case; since severe current stress is imposed on the
SenseFET until OLP is triggered. The FSD146MRBN
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.
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 (V OUT )
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 (V FB ). If V FB exceeds
2.5V, D1 is blocked and the 2.0μA current source
starts to charge C FB slowly up . In this condition, V FB
? 2011 Fairchild Semiconductor Corporation
FSD146MRBN ? Rev. 1.0.0
10
Figure 21. Abnormal Over-Current Protection
www.fairchildsemi.com
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