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參數資料
| 型號： | FS7M0880 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Fairchild Power Switch(FPS) |
| 中文描述： | 飛兆半導體功率開關（FPS） |
| 文件頁數： | 5/12頁 |
| 文件大小： | 277K |
| 代理商： | FS7M0880 |
FS7M0880
5
Block Diagram
It can be divided into several large, functional sections:
under voltage lockout circuitry (UVLO); reference voltage;
oscillator (OSC); pulse width modulation (PWM) block;
protection circuits; and gate driving circuits.
Start Up
Input voltage range: 85 ~ 265 V (AC)
When Vac is minimum and it is started by the DC Link bulk
capacitor, the starting resistance is calculated as follows:
When Vac is maximum and it is started by the DC Link Bulk
capacitor, the power loss is calculated as follows:
)
2
1.3M
When it is started by the one-phase of the AC-Lines and Vac
is minimum, the starting resistance is calculated as follows:
When it is started bythe one-phase of the AC_Line and Vac
is maximum, the power loss is calculated as follows:
The starting current across the starting resistor charges the
SPS V
CC
capacitor. When the V
CC
becomes greater than the
starting voltage, the SPS starts to switch the built-in
MOSFET. Once it starts, the current in the SPS control IC
abruptly is increased to 7mA, makes it difficult to operate
with the current through the starting resistor. Therefore, after
it starts, the auxiliary winding of the transformer supplies
most of the power to SPS. It is best to use an appropriate size
V
CC
power capacitor, generally about 33
μ
F, because if it is
too large, the starting time can be delayed. This operation is
described in Fig 2. Although V
CC
only needs to be set above
9V during operation, it should be set such that OVP does not
execute during an overload condition. For a full load, about
18~20V is appropriate for the V
CC
voltage and for no load,
about 13~14V.
Protection
The FPS has several self-protection circuits, which can
operate without additional external components, thereby
acquiring reliability without increase in cost. After a
protection circuit comes on, it can completely stop the SMPS
until the cutoff AC power is reconnected (Latch Mode
Protection) or it can make the SMPS operate above the
UVLO by unlatching the control voltage below the ULVO
(Auto Restart Mode Protection).
These two operations are user-command operations, so the
user can select the
operation from the IC or by carefully controlling circuit
constants. The operation and applications for each protection
are described below.
Figure 2. Start-up Waveform
Over Load Protection
In abnormal status of SMPS over load is distinguished from
load short. This happens when a load exceeds a pre-set load
during normal operation. That is, the FPS overload
protection circuit stops the FPS if an instantaneous load
increases and becomes greater than 50W during normal
operation, when the maximum SMPS output had been
pre-set to 30W. In this type of protection, the protection
Rstart
80
μ
A
----------------–
1.3M
=
=
Ploss
--------------------–
(
0.1 W
)
=
=
265V
85V
Va
RStart
-------------------------–
π
2
π
80
μ
A
(
)
÷
=
38M
=
Va rms
)
2
π
------
Vp
t
sin
15
–
(
)
2dt
o
π
∫
=
177V Vp
265 2
=
)
2
=
Ploss
82 mW
2
--------------------------
-----------------
=
=
)
=
Figure 1. Detail of the undervoltage lockout (UVLO)
circuitry in a Fairchild Power Switch. The gate
operating circuit holds in a
low
state during UVL
thereby maintaining the SenseFET at turnoff.
UVLO
Fig 2
< Start-up Waveform >
V
cc
V
z
1
5V
9
V
2
0
I cc
[ mA]
[
V
]
0. 1
6V
Pa
O
n Reset
R
nge
7
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| FS7M0880TU | 功能描述:電流型 PWM 控制器 8a/800V Power Switch 70kHz RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| FS7M0880TU | 制造商:Fairchild Semiconductor Corporation 功能描述:Power Supply IC |
| FS7M0880YDTU | 功能描述:電流型 PWM 控制器 8a/800V Power Switch 70kHz RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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| FS7SM-12 | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:MITSUBISHI Nch POWER MOSFET |
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