DataSheet.es FS7M0880 Hoja de datos PDF


PDF FS7M0880 Datasheet ( Hoja de datos )

Número de pieza FS7M0880
Descripción Fairchild Power Switch(FPS)
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo
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FS7M0880 datasheet

1 Page

FS7M0880 pdf
FS7M0680, FS7M0880
Electrical Characteristics (SenseFET Part)
(Ta=25°C unless otherwise specified)
FS7M0680
Parameter
Drain-Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain-Source On Resistance (note1)
Input Capacitance
Output Capacitance
Reverse Transfer Capacitance
Turn On Delay Time
Rise Time
Turn Off Delay Time
Fall Time
Total Gate Charge
(Gate-Source+Gate-Drain)
Gate-Source Charge
Gate-Drain (Miller) Charge
Symbol
BVDSS
IDSS
RDS(ON)
Ciss
Coss
Crss
td(on)
tr
td(off)
tf
Qg
Qgs
Qgd
Condition
VGS=0V, ID=50µA
VDS=Max., Rating,
VGS=0V
VDS=0.8Max., Rating,
VGS=0V, TC=125°C
VGS=10V, ID=5.0A
VGS=0V, VDS=25V,
f=1MHz
VDD=0.5BVDSS, ID=8.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
VGS=10V, ID=8.0A,
VDS=0.5BVDSS (MOSFET
switching time are
essentially independent of
operating temperature)
Min.
800
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ. Max.
--
- 50
- 200
1.6
1600
140
42
60
150
300
130
2.0
-
-
-
-
-
-
-
70 -
16 -
27 -
Unit
V
µA
µA
pF
nS
nC
FS7M0880
Parameter
Drain-Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain-Source On Resistance (note1)
Input Capacitance
Output Capacitance
Reverse Transfer Capacitance
Turn On Delay Time
Rise Time
Turn Off Delay Time
Fall Time
Total Gate Charge
(Gate-Source+Gate-Drain)
Gate-Source Charge
Gate-Drain (Miller) Charge
Symbol
BVDSS
IDSS
RDS(ON)
Ciss
Coss
Crss
td(on)
tr
td(off)
tf
Qg
Qgs
Qgd
Condition
VGS=0V, ID=50µA
VDS=Max., Rating,
VGS=0V
VDS=0.8Max., Rating,
VGS=0V, TC=125°C
VGS=10V, ID=5.0A
VGS=0V, VDS=25V,
f=1MHz
VDD=0.5BVDSS, ID=8.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
VGS=10V, ID=8.0A,
VDS=0.5BVDSS (MOSFET
switching time are
essentially independent of
operating temperature)
Min.
800
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ. Max.
--
- 50
- 200
1.2
2460
210
64
-
95
150
60
1.5
-
-
-
90
200
450
150
- 150
20 -
70 -
Unit
V
µA
µA
pF
nS
nC
Note:
1. Pulse test: Pulse width 300µS, duty cycle 2%
5

5 Page

FS7M0880 arduino
FS7M0680, FS7M0880
Functional Description
1. Startup : Figure 4 shows the typical startup circuit and
transformer auxiliary winding for FS7M-series. Because all
the protections are implemented as latch mode, AC startup is
typically used to provide a fast reset as shown in Figure 4.
Before FPS begins switching operation, only startup current
(typically 40uA) is consumed and the current supplied from
the AC line charges the external capacitor (Ca) that is
connected to the Vcc pin. When Vcc reaches start voltage of
15V (VSTART), FPS begins switching, and the current
consumed by FPS increases to 8mA. Then, FPS continues its
normal switching operation and the power required for this
device is supplied from the transformer auxiliary winding,
unless Vcc drops below the stop voltage of 9V (VSTOP). To
guarantee the stable operation of the control IC, Vcc has
under voltage lockout (UVLO) with 6V hysteresis. Figure 5
shows the relation between the FPS operating supply current
and the supply voltage (Vcc).
The minimum average of the current supplied from the AC is
given by
Isu
a
p
v
g
=
-----2-------V-----a---c--m-----i-n-
π
V-----s-2-t--a---r--t
R----1-s---t-r
where Vacmin is the minimum input voltage, Vstart is the Vcc
start voltage (15V) and Rstr is the startup resistor. The
startup resistor should be chosen so that Isupavg is larger than
the maximum startup current (80uA).
Once the resistor value is determined, the maximum loss in
the startup resistor is obtained as
Loss
=
R----1-s---t-r
(---V----a---c---m----a---x---)--22----+------V----s--t--a---r--t-2-
-2-------2--------V-----s--t--a-π--r--t------V----a---c--m-----a--x-
where Vacmax is the maximum input voltage. The startup
resistor should have proper rated dissipation wattage.
CDC
AC line
(Va
m
c
i
n
- Vacm ax)
Rs tr
1N4007
Is up
FS7M -series
Vcc
Ca
Da
Figure 4. Startup circuit
Icc
8mA
Power Down
Power Up
40uA
Vstop=9V Vstart=15V
Vcc
Vz
Figure 5. Relation between operating supply current and
Vcc voltage
2. Feedback Control : FS7M-series employs current mode
control, as shown in Figure 6. An opto-coupler (such as the
H11A817A) and shunt regulator (such as the KA431) are
typically used to implement the feedback network.
Comparing the feedback voltage with the voltage across the
Rsense resistor plus an offset voltage makes it possible to
control the switching duty cycle. When the reference pin
voltage of the KA431 exceeds the internal reference voltage
of 2.5V, the H11A817A LED current increases, thus pulling
down the feedback voltage and reducing the duty cycle. This
event typically happens when the input voltage is increased
or the output load is decreased.
2.1 Pulse-by-pulse current limit: Because current mode
control is employed, the peak current through the Sense FET
is limited by the inverting input of PWM comparator (Vfb*)
as shown in Figure 6. The feedback current (IFB) and
internal resistors are designed so that the maximum cathode
voltage of diode D2 is about 2.8V, which occurs when all IFB
flows through the internal resistors. Since D1 is blocked
when the feedback voltage (Vfb) exceeds 2.8V, the
maximum voltage of the cathode of D2 is clamped at this
voltage, thus clamping Vfb*. Therefore, the peak value of
the current through the Sense FET is limited.
2.2 Leading edge blanking (LEB) : At the instant the
internal Sense FET is turned on, there usually exists a high
current spike through the Sense FET, caused by external
resonant capacitor across the MOSFET and secondary-side
rectifier reverse recovery. Excessive voltage across the
Rsense resistor would lead to incorrect feedback operation in
the current mode PWM control. To counter this effect, the
FPS employs a leading edge blanking (LEB) circuit. This
circuit inhibits the PWM comparator for a short time (TLEB)
after the Sense FET is turned on.
10

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