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PDF FSDM311L Datasheet ( Hoja de datos )

Número de pieza FSDM311L
Descripción Green Mode Fairchild Power Switch (FPS)
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo
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FSDM311L datasheet

1 Page

FSDM311L pdf
FSDM311
Electrical Characteristics (Sense FET Part)
(Ta = 25°C unless otherwise specified)
Parameter
Sense FET SECTION
Drain-Source Breakdown Voltage
Zero Gate Voltage Drain Current
Static Drain-Source on Resistance
(Note)
Forward Trans conductance (Note)
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
Condition
Min. Typ. Max. Unit
BVDSS
IDSS
VGS=0V, ID=50µA
VDS=Max. Rating,
VGS=0V
VDS=0.8Max. Rating,
VGS=0V, TC=125°C
650 720
--
-
25
- - 200
RDS(ON) VGS=10V, ID=0.5A
- 14 19
gfs
CISS
COSS
CRSS
td(on)
tr
td(off)
tf
Qg
Qgs
Qgd
VDS=50V, ID=0.5A
VGS=0V, VDS=25V,
f=1MHz
VDD=0.5B VDSS,
ID=1.0A
(MOSFET switching time
is essentially
independent of
operating temperature)
VGS=10V, ID=1.0A,
VDS=0.5B VDSS
(MOSFET switching time
is essentially
independent of operating
temperature)
1.0
-
-
-
-
-
-
-
-
-
-
1.3
162
18
3.8
9.5
19
33
42
7.0
3.1
0.4
-
-
-
-
-
-
-
-
-
-
-
V
µA
µA
S
pF
ns
nC
Note:
1. Pulse test: Pulse width 300µS, duty 2%
2. S = -1--
R
5

5 Page

FSDM311L arduino
FSDM311
OSC
Vfb
Vfb
4
Cfb
5uA 400uA
+
-
R 3V
OLP
RESET
Vth 4.5V
TSD
SQ
R
GATE
DRIVER
SQ
R
A/R
FSDM311
OLP, TSD
Protection Block
OLP
4.5V
3V
FPS Switching Area
Idelay (5uA) charges Cfb
IC Reset
Figure 7. Protection block
4.1 Over Load Protection (OLP) : Overload is a load cur-
rent that exceeds a pre-set level due to an abnormal situation.
If this occurs, the protection circuit should be triggered to
protect the SMPS. It is possible that a short term load tran-
sient can occur under normal operation. If this occurs the
system should not shut down. In order to avoid false shut-
downs, the over load protection circuit is designed to trigger
after a delay. Therefore the device can discriminate between
transient overloads and true fault conditions. The device is
pulse-by-pulse current limited and therefore, for a given
input voltage, the maximum input power is limited. If the
load tries to draw more than this, the output voltage will drop
below its set value. This reduces the opto-coupler LED cur-
rent which in turn will reduce the photo-transistor current.
Therefore, the 400uA current source will charge the feed-
back pin capacitor, Cfb, and the feedback voltage, Vfb, will
increase. The input to the feedback comparator is clamped at
around 3V. Therefore, once Vfb reaches 3V, the device is
switching at maximum power. At this point the 400uA cur-
rent source is blocked and the 5uA source continues to
charge Cfb. Once Vfb reaches 4.5V, switching stops. There-
fore the shutdown delay time is set by the time required to
charge Cfb from 3V to 4.5V with 5uA as shown in Fig. 5.
t1 t2
t1<<t2, t3
t1 = -1/RCΧ ln( 1-v(t1)/R )
t2 = CΧ [v(t1+t2)-v(t1)]Χ Idelay
t3
v(t1)=3V
t
Figure 8. Over load protection delay
5. Soft Start : The FPS has an internal soft start circuit that
increases the drain current limit together with the MOSFET
current slowly after it starts up. The soft start time is typical
15msec as shown in figure 9. It progressively increases dur-
ing the start-up phase. The pulse width to the power switch-
ing devices is progressively increased to establish the correct
working conditions for transformers, inductors, and capaci-
tors. The voltage on the output capacitors is progressively
increased with the intention of smoothly establishing the
required output voltage. Consequently it prevents the trans-
former’s saturation and the secondary diodes’s stress.
0.55A
Drain current
[A]
2mS
7steps
4.2 Thermal Shutdown (TSD) : The Sense FET and the
control IC are assembled in one package. This makes it easy
for the control IC to detect the temperature of the Sense FET.
When the temperature exceeds approximately 145°C, ther-
mal shutdown is activated.
0.31A
Figure 9. Internal Soft Start
t
11

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