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參數(shù)資料
| 型號(hào)： | FS6X1220RJ |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Fairchild Power Switch (FPSTM) |
| 中文描述： | 23.7 A SWITCHING REGULATOR, PSSO6 |
| 封裝： | LEAD FREE, D2-PAK, 6 PIN |
| 文件頁(yè)數(shù)： | 9/15頁(yè) |
| 文件大?。?/td> | 739K |
| 代理商： | FS6X1220RJ |
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www.fairchildsemi.com
FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Rev. 1.0.1
F
Applications Information
1. Startup
To guarantee stable operation of the control IC, Vcc has under
voltage lockout (UVLO) with 6V hysteresis. Figure 16 shows the
relation between the supply current (Icc) and the supply voltage
(Vcc). Before Vcc reaches 15V, the start-up current is 60
μ
A,
which is usually provided by the DC link through start-up resis-
tor. When Vcc reaches 15V, the control IC begins operation and
the operating current increases to 10mA as shown. Once the
control IC starts operation, it continues its normal operation
unless Vcc goes below the stop voltage of 9V.
Figure 16. Relation between Supply Current and
Voltage
2. Feedback Control
The FS6X-Series employs current mode control. The voltage of
the feedback pin is compared with the current sense voltage for
pulse width modulation (PWM). Figure 17 illustrates the simpli-
fied PWM block. The feedback voltage determines the peak
drain current of the SenseFET. Usually, an opto-coupler, along
with the TL431(shunt regulator) are used to implement the feed-
back network. The collector of the opto-coupler transistor is
connected to the feedback pin and the emitter is connected to
the ground pin. When the voltage of the reference pin of the
TL431 exceeds the internal reference voltage of 2.5V, the opto-
coupler diode current increases, pulling down the feedback volt-
age.
Figure 17. Pulse Width Modulation (PWM) Cir-
cuit
3. Protection Circuit
Besides pulse-by-pulse current limit, the FS6X-Series has the
following self protection functions: over load protection (OLP),
over voltage protection (OVP), and thermal shutdown (TSD).
Because these protection circuits are fully integrated into the IC
without external components, the reliability is improved. In the
event of a fault condition, FS6X-Series enters into auto-restart
operation. Once the fault condition occurs, switching operation
is terminated, and the MOSFET remains off, which causes Vcc
to be reduced. When Vcc reaches 9V, the protection is reset
and the supply current reduces to 60uA. Then, Vcc begin to
increase with the current provided through the start-up resistor.
When Vcc reaches 15V, FS6X-Series resumes its normal oper-
ation if the fault condition is removed. In this manner, the auto-
restart alternately enables and disables the switching of the
power MOSFET until the fault condition is eliminated as illus-
trated in Figure 18.
Figure 18. Auto Restart Operation After Protec-
tion
3.1 Pulse-by-pulse Current Limit
As shown in Figure 17, the drain current of the power MOSFET
is limited by the inverting input of PWM comparator (Vfb*).
Assuming that the 0.9mA current source flows only through the
internal resistor (28R +R= 2.9k), the cathode voltage of diode
D2 is about 2.6V. Since D1 is blocked when the feedback volt-
age (Vfb) exceeds 2.6V, the maximum voltage of the cathode of
D2 is 2.6V. Therefore, the maximum value of Vfb* is about 0.1V,
which limits the peak value of the power MOSFET drain current.
Icc
Vcc
Vstop=9V
60uA
10mA
Vstart=15V
Vz
4
OSC
Vcc
Vref
5uA
0.9mA
V
SD
R
28R
FB
Gate
Driver
OLP
D1
D2
Vfb*
Vfb
431
Cfb
Vo
situation
Fault
9V
15V
Vcc
Vds
Icc
10mA
60uA
t
occurs
Fault
removed
Fault
operation
Normal
operation
on
Normal
Power
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| FS6X1220RJX | 功能描述:電流型 PWM 控制器 POWER_CONVERSION RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| FS6X1220RTTU | 功能描述:電源開(kāi)關(guān) IC - 配電 RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FS6X1220RTYDTU | 功能描述:電源開(kāi)關(guān) IC - 配電 Offline Power Switch 12a/200V DC/DC RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
| FS6X4LG6 | 功能描述:電線導(dǎo)管 Solid Raceway,PVC,6"X4"X6’,LGRY RoHS:否 制造商:Panduit 類型:Slotted SideWall Open finger design wiring cut 材料:Polypropylene 顏色:Light Gray 大小: 最大光束直徑: 抗拉強(qiáng)度: 外部導(dǎo)管寬度:25 mm 外部導(dǎo)管高度:25 mm |
| FS6X4LG6-A | 功能描述:電線導(dǎo)管 Solid Raceway,PVC,6"X4"X6’,LGRY,ADH RoHS:否 制造商:Panduit 類型:Slotted SideWall Open finger design wiring cut 材料:Polypropylene 顏色:Light Gray 大小: 最大光束直徑: 抗拉強(qiáng)度: 外部導(dǎo)管寬度:25 mm 外部導(dǎo)管高度:25 mm |
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