参数资料
| 型号： | FSQ500N |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC PWM/SENSEFET 130KHZ 8-MDIP |
| 标准包装： | 50 |
| 系列： | FPS™ |
| 输出隔离： | 隔离 |
| 频率范围： | 120kHz ~ 140kHz |
| 输入电压： | 5.5 V ~ 10 V |
| 输出电压： | 700V |
| 功率（瓦特）： | 6.5W |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-DIP |
| 包装： | 管件 |
3.1 Overload Protection (OLP) : Overload is defined
as the load current exceeding its normal level due to
V DS
Power
on
TSD
occurs
TSD
removed
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
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 after a specified time to determine
whether the situation is transient or a true overload.
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
V CC
6.5V
6.0V
5.7V
restricted with a given input voltage. If the output
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,
which also reduces the opto-coupler transistor
Normal Fault Normal
operation situation operation
Figure 19. Over-Temperature Protection (OTP)
t
current, thus increasing the feedback voltage (V FB ). If
V FB exceeds 2.7V, D1 is blocked and the 5μA current
source starts to charge C B slowly up to V CC . In this
condition, V FB continues increasing until it reaches
4.5V, when the switching operation is terminated, as
shown in Figure 18. The delay time for shutdown is
the time required to charge C B from 2.7V to 4.5V with
5μA. In general, a 10 ~ 50ms delay is typical for most
applications. This protection is implemented in auto-
restart mode.
V FB Overload protection
4.5V
2.7V
4. Soft-Start : The soft-start time is tuned by an external
V CC capacitor (C A ), which increases PWM comparator
non-inverting input voltage together with the senseFET
current slowly after it starts. Before V CC reaches V START ,
C A is charged by the current I CH -I START , where I CH and
I START are described in Figure 15. After V CC reaches
V START , all internal blocks are activated, so that the
current consuming inside IC becomes I OP . Therefore,
C A is charged by the current I CH -I OP , which makes the
increasing slope of V CC become sluggish. V CC is shifted
by 6.0V negatively (it is performed in soft-start block in
Figure 2), then V CC -6.0V is an input of one of the input
terminals of the PWM comparator. The drain current
follows V CC -6.0V instead of the V FB * because of the
low-dominant feature of the PWM comparator. The soft-
start time can be made long or short by selecting C A , as
described in Figure 20. During t S/S , I DELAY is disabled to
avoid unwanted OLP. Typically, t S/S is around 4.6ms
with 27μF of C A .
V CC t S/S
T 12 = C B *(4.5-2.7)/I DELAY
6.5V
6V
V CCREG
V START
T 1
T 2
t
Figure 18.
Overload Protection
5V
V STOP
3.2 Thermal Shutdown (TSD): The senseFET and
the control IC in one package makes it easy for the
t 1
t 2
t
control IC to detect an abnormal over temperature of
the senseFET. When the temperature exceeds
~140 ° C, the thermal shutdown triggers. When TSD
t 1 =C A ×6V/(I CH -I START )
t S/S =C A ×0.5V/(I CH -I OP )
triggers, delay current is disabled, switching operation
stops, and V CC through the internal high-voltage
current source is set to 5.7V from 6.5V, as shown in
Figure 19. Since the TSD signal prohibits the
senseFET from switching, there is no switching until
the junction temperature decreases sufficiently. If the
junction temperature is lower than 60°C typically,
TSD signal is removed and V CC is set to 6.5V again.
While V CC increases from 5.7V to 6.5V, the soft-start
function makes the senseFET turn on and off with no
voltage and/or current stress.
? 2009 Fairchild Semiconductor Corporation
FSQ500N ? Rev. 1.0.0
9
Figure 20. Soft-Start Function
The peak value of the drain current of the power
switching device is progressively increased to establish
the correct working conditions for transformers,
inductors, and capacitors. The voltage on the output
capacitors is progressively increased with the intention
of smoothly establishing the required output voltage. It
also helps to prevent transformer saturation and reduce
stress on the secondary diode during startup.
www.fairchildsemi.com
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