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PDF FS8S0765RCBTU Datasheet ( Hoja de datos )

Número de pieza FS8S0765RCBTU
Descripción Fairchild Power Switch(FPS)
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo
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FS8S0765RCBTU datasheet

1 Page

FS8S0765RCBTU pdf
Electrical Characteristics (SenseFET part)
(TA = 25°C unless otherwise specified)
Symbol
Parameter
BVDSS Drain Source Breakdown Voltage
IDSS Zero Gate Voltage Drain Current
RDS(ON)
gfs
Ciss
Coss
Crss
td (on)
tr
td (off)
tf
Qg
Qgs
Qgd
Static Drain Source On Resistance (1)
Forward Transconductance
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
Condition
VGS=0V, ID=250μA
VDS=650V, VGS=0V
VDS=520V
VGS=0V, TC=125°C
VGS=10V, ID=3.5A
VDS=40V, ID=3.5A
VGS=0V, VDS=25V,
f = 1MHz
VDD=325V, ID=6.5A (2)
Min.
650
-
-
-
-
-
-
-
-
-
-
-
VVGDSS==31205VV, I(D2=) 6.5A,
-
-
-
Note:
1. Pulse test: Pulse width 300μS, duty 2%
2. MOSFET switching time is essentially independent of operating temperature.
Typ.
-
-
-
1.4
8
1415
100
15
25
60
115
65
40
7
12
Max.
-
200
300
1.6
-
-
-
-
-
-
-
-
-
-
-
Unit
V
μA
μA
W
mho
pF
nS
nC
FS8S0765RCB Rev. 1.0.2
5
www.fairchildsemi.com

5 Page

FS8S0765RCBTU arduino
Functional Description
1. Start up: To guarantee stable operation of the control
IC, FS8S0765RCB has UVLO circuit with 6V hysteresis
band. Figure 22 shows the relation between the supply
current (Icc) and the supply voltage (Vcc). Before Vcc
reaches 15V, the FPS consumes only startup current of
80mA, which is usually provided by the DC link through
the start-up resistor. When Vcc reaches 15V, the FPS
begins operation and the operating current increases to
15mA as shown. Once the control IC starts operation, it
continues normal operation until Vcc goes below the
stop voltage of 9V.
Icc
15mA
80uA
Vstop=9V
Vstart=15V
OVP
Vcc
Figure 22. High Voltage Current Source
2. Feedback Control: FS8S0765RCB employs primary
side regulation, which permits elimination of feedback
circuit components in the secondary side, such as opto-
coupler and TL431. Figure 23 shows the primary side
control circuit. The primary side regulation voltage (Vpsr)
is controlled to the breakdown voltage of zener diode
(Dz). Because current mode control is employed, the
drain current of the power MOSFET is limited by the
inverting input of PWM comparator (Vfb*). When
MOSFET turns on, usually there exists high current
spike in the MOSFET current caused by primary-side
capacitance and secondary-side rectifier reverse
recovery. To prevent premature termination of the
switching pulse due to the current spike, the FPS
employs leading edge blanking (LEB). The leading edge
blanking circuit inhibits the PWM comparator for a short
time after the MOSFET is turned on.
Vpsr
Vcc Vref
2uA
Vfb FB
4
DZ Cfb
D1
0.9m
A
OSC
D2
2.5R
Vfb*
R
RZ
Gate
driver
VSD OLP
Figure 23. Pulse-Width Modulation (PWM)
Circuit
3. Protection function: FS8S0765RCB has four self-
protective functions such as abnormal over current
protection (AOCP), overload 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 without cost increase. In the event of these
fault conditions, the FPS enters into auto-restart
operation. Once the fault condition occurs, switching
operation is terminated and MOSFET remains off, which
forces Vcc to be reduced. When Vcc reaches 9V, the
protection is reset and the supply current reduces to 80
μA. Then, Vcc begin to increase with the current
provided through the start-up resistor. When Vcc
reaches 15V, the FPS resumes 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 24.
Protection is activated
(OCP,OLP,OVP or TSD)
V
Vds
V
Vcc
15V
9V
Vcc
time
Auto restart
time
Figure 24. Auto restart operation after
protection
3.1 Abnormal Over Current Protection (AOCP): When
the secondary rectifying diodes or the transformer pins
are shorted, a steep current with extremely high di/dt can
flow during the LEB time. Therefore, the abnormal over-
current protection (AOCP) block is added to ensure the
reliability, as shown in Figure 25. It turns off the
SenseFET within 300ns after the abnormal over-current
condition is sensed.
OVP
OLP
S Q'
GATE
DRIVER
TSD
R
UVLO
PWMComp
SenseFE
T
AOCP COMP.
Vsense : 1V
Figure 25. AOCP block
FS8S0765RCB Rev. 1.0.2
11
www.fairchildsemi.com

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