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參數資料
| 型號： | FSES0765RGWDTU |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Green Mode Fairchild Power Switch (FPS) for Green Mode Fairchild Power Switch (FPSTM) for |
| 中文描述： | 15 A SWITCHING REGULATOR, 130 kHz SWITCHING FREQ-MAX, PZFM6 |
| 封裝： | TO-220, 6 PIN |
| 文件頁數： | 12/18頁 |
| 文件大小： | 249K |
| 代理商： | FSES0765RGWDTU |
FSES0765RG
12
Figure 6. Auto restart operation
3.1 Over Load Protection (OLP) :
Overload occurs when
the load current exceeds a pre-set level due to an unexpected
event. In this situation, the protection circuit should be
activated in order to protect the SMPS. However, even when
the SMPS is in the normal operation, the over load protection
circuit can be activated during the load transition. In order to
avoid this undesired operation, the over load protection
circuit is designed to be activated after a specified time to
determine whether it is a transient or overload situation.
Because of the pulse-by-pulse current limit capability, the
maximum peak current through the Sense FET is limited,
and therefore the maximum input power is restricted with a
given input voltage. If the output consumes beyond this
maximum power, the output voltage (Vo) 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 2.5V, D1 is blocked and the 2uA current source
(I
delay
) starts to charge C
B
slowly up to Vcc. In this
condition, Vfb continues increasing until it reaches 7.5V,
then the switching operation is terminated as shown in figure
7. The delay time for shutdown is the time required to charge
C
B
from 2.5V to 7.5V with 2uA. In general, a 10 ~ 50 ms
delay time is typical for most applications.
Figure 7. Over Load Protection
3.2 Abnormal Over Current Protection (AOCP)
: Even
though the FPS has OLP (Over Load Protection) and current
mode PWM feedback, these protections are not enough to
protect the FPS when a secondary side diode short or a
transformer pin short occurs. The FPS has an internal AOCP
(Abnormal Over Current Protection) circuit, as shown in
figure 8. When the gate turn-on signal is applied to the power
Sense FET, the AOCP block is enabled and monitors the
current through the sensing resistor. The voltage across the
resistor is then compared with a preset AOCP level. If the
sensing resistor voltage is greater than the AOCP level, the
reset signal is applied to the latch, resulting in the shutdown
of SMPS.
Figure 8. AOCP Block
3.3 Over Voltage Protection (OVP)
: If the secondary side
feedback circuit malfunctions or a solder defect causes an
open in the feedback path, the current through the opto-
coupler transistor becomes almost zero. Then, Vfb climbs up
in a manner similar to the over load situation, forcing the
preset maximum current to be supplied to the SMPS until the
over load protection is activated. Because more energy than
required is provided to the output, the output voltage may
Fault
situation
9V
12V
Vcc
Vds
t
Fault
occurs
Fault
removed
Normal
operation
Normal
operation
Power
on
V
FB
t
2.5V
7.5V
Over load protection
T
12
= Cfb*(7.5-2.5)/I
delay
T
1
T
2
2
S
Q
Q
R
OSC
R
2.5R
GND
Gate
driver
LEB
PWM
+
-
Vaocp
AOCP
R
sense
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