參數(shù)資料
型號(hào)： FS7M0680YDTU
廠商： FAIRCHILD SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： Fairchild Power Switch(FPS)
中文描述： 24 A SWITCHING REGULATOR, PZFM5
封裝： TO-3P, 5 PIN
文件頁(yè)數(shù)： 5/16頁(yè)
文件大小： 1598K
代理商： FS7M0680YDTU
FS7M0680
5
General Application
In general, the FPS consists of several functional sections:
under voltage lockout circuit (UVLO), reference voltage,
oscillator (OSC), pulse width modulation (PWM) block, pro-
tection circuits and gate drive circuit.
Start-Up
The minimum current that FPS requires for the start-up is
80
μ
A. This current can be provided by the DC link bulk
capacitor (DC start-up) or directly by the AC line (AC start-
up).
DC start-up
Assuming wide range input voltage (85-265V), the maxi-
mum value of Rstart is calculated with the minimum input
voltage as follows:
The maximum power dissipation in Rstart is calculated with
the maximum input voltage as follows:
AC start-up
When the start-up current is provided directly by the AC line
through a single rectifier diode, the maximum value of Rstart
is calculated with the minimum input voltage as follows:
The maximum power dissipation in Rstart is calculated with
the maximum input voltage as follows:
π
∫
The current provided through the starting resistor charges the
Vcc capacitor. When Vcc becomes higher than the threshold
voltage, the FPS starts the switching operation of the built-in
power MOSFET. Then, the current required by the control
IC is suddenly increased to 7mA, which makes it difficult for
FPS to operate with the current provided through Rstart.
Therefore, after FPS starts, the auxiliary winding of the
transformer should supply most of the power required by the
FPS. It is suitable to use an appropriately sized V
CC
capaci-
tor, generally about 33
μ
F, because the starting time can be
delayed if it is too large. This operation is described in figure
2. Although V
CC
needs to be set only above 9V during the
normal operation, it should be set to such an extent that over
voltage protection (OVP) is not activated during an overload
condition. For full load, about 18~20V is appropriate for
V
CC
and for no load, about 13~14V is suitable.
Protection
The FPS has not only pulse by pulse current limit circuit, but
also several self-protection circuits. These protection circuits
are fully integrated and do not require external components.
After the protection circuits are activated, the FPS com-
pletely stops the SMPS (Latch Mode Protection) until the
power on reset circuit is activated by removing and restoring
input power, or restarts the SMPS automatically (Auto
Restart Mode Protection).
These two operations are user-selected operations, so the
user can select proper device according to the shutdown
mode. The operations principle and applications for each
protection are described as follows.
Figure 2. Variation of Icc according to Vcc
Rstart
80
μ
A
----------------–
1.3M
=
=
Ploss
1.3M
----------------------–
)
2
0.1 W
)
=
=
265V
85V
Va
RStart
-------------------------–
π
2
π
80
μ
A
(
)
÷
=
380k
=
Va rms
)
2
π
------
Vp
t
sin
15
–
(
)
2dt
o
=
177V Vp
265 2
=
)
2
=
Ploss
Rstart
2
--------------------------
380k
-----------------
=
=
82 mW
)
=
Figure 1. Undervoltage lockout (UVLO) circuit
5V
Vref
Good Logic
Good Logic
Power on
Reset
Latch
Comparator
DC
LINK
Rstart
3
FPS
Vz
15V/9V
6V
UVLO
Vcc
Fig 2
< Start-up Waveform >
Vcc
Vz
15V
9V
20
Icc
[mA]
[V]
0.1
6V
Power On Reset
Range
7
相關(guān)PDF資料
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