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參數資料
| 型號： | FS6X1220RTTU |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Fairchild Power Switch (FPS) |
| 中文描述： | 32.8 A SWITCHING REGULATOR, PSFM5 |
| 封裝： | TO-220F, 5 PIN |
| 文件頁數： | 8/16頁 |
| 文件大?。?/td> | 471K |
| 代理商： | FS6X1220RTTU |
FS6X1220R
8
Functional Description
1.
Startup
: To guarantee stable operation of the control IC,
Vcc has under voltage lockout (UVLO) with 6V hysteresis.
Figure 1 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 resistor. 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 1. Relation between supply current and voltage
2. Feedback Control
: The FS6X1220R employs current
mode control. The voltage of the feedback pin is compared
with the current sense voltage for pulse width modulation
(PWM). Figure 2 illustrates the simplified PWM block. The
feedback voltage determines the peak drain current of the
SenseFET. Usually opto-coupler along with TL431 are used
to implement feedback network. The collector of the opto-
coupler transistor is connected to feedback pin and the
emitter is connected to the ground pin. When the voltage of
the reference pin of TL431 exceeds the internal reference
voltage of 2.5V, the opto-coupler diode current increases,
pulling down the feedback voltage.
Figure 2. Pulse width modulation (PWM) circuit
3. Protection Circuit
: Besides pulse-by-pulse current limit,
the FS6X1220R has 3 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 can be improved. In the event of these fault
conditions, FS6X1220R enters into auto-restart operation.
Once the fault condition occurs, switching operation is
terminated and 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, FS6X1220R resumes its
normal operation 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 illustrated in figure 3.
Figure 3. Auto restart operation after protection
3.1 Pulse-by-pulse current limit
: As shown in figure 2, 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 voltage
(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
occurs
Fault
removed
Fault
operation
Normal
operation
on
Normal
Power
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