参数资料
| 型号： | FSQ311L |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 13/21页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH FPS LOW EMI HE 8-LSOP |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 输入电压： | 9 V ~ 20 V |
| 输出电压： | 650V |
| 功率（瓦特）： | 10W |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SMD，鸥翼型 |
| 供应商设备封装： | 8-LSOP |
| 包装： | 管件 |
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.
V FB
6.0V
FSQ0365RN Rev.00
Overload protection
V DS
Power
on
Fault
occurs
Fault
removed
2.8V
t 12 = C FB *(6.0-2.8)/I delay
t 1
Figure 24. Overload Protection
t 2
t
V CC
12V
8V
t
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 LEB time.
Even though the FSQ-series has Overload Protection
(OLP), it is not enough to protect the FSQ-series in that
abnormal case, since severe current stress is imposed
on the SenseFET until OLP triggers. The FSQ-series
has an internal Abnormal Over-Current Protection
FSQ0365RN Rev. 00
Normal
operation
Fault
situation
Normal
operation
(AOCP) circuit as shown in Figure 25. When the gate
turn-on signal is applied to the power SenseFET, the
AOCP block is enabled and monitors the current
Figure 23. 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 the normal
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 latch, resulting in the
shutdown of the SMPS.
operation, the overload protection circuit can be
triggered during load transition. To avoid this undesired
3R
OSC
operation, the overload protection circuit is designed to
PWM
S
Q
trigger only after a specified time to determine whether it
is a transient situation or a true overload situation.
LEB
200ns
R
Q
Gate
driver
Because of the pulse-by-pulse current limit capability,
the maximum peak current through the SenseFET is
R
limited, and therefore the maximum input power is
restricted with a given input voltage. If the output
R sense
1
consumes more than this maximum power, the output
voltage (V O ) decreases below the set voltage. This
reduces the current through the opto-coupler LED,
AOCP
FSQ0365RN Rev.00
V OCP
GND
which also reduces the opto-coupler transistor current,
thus increasing the feedback voltage (V FB ). If V FB
exceeds 2.8V, D1 is blocked and the 5μA current source
starts to charge CB slowly up to V CC . In this condition,
V FB continues increasing until it reaches 6V, when the
switching operation is terminated, as shown in Figure
24. The delay for shutdown is the time required to
charge CB from 2.8V to 6V with 5μA. A 20 ~ 50ms delay
is typical for most applications.
? 2007 Fairchild Semiconductor Corporation
FSQ0365, FSQ0265, FSQ0165, FSQ321 ? Rev. 1.0.6
13
Figure 25. Abnormal Over-Current Protection
www.fairchildsemi.com
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