DataSheet.es FSGM0465RBWDTU Hoja de datos PDF


PDF FSGM0465RBWDTU Datasheet ( Hoja de datos )

Número de pieza FSGM0465RBWDTU
Descripción Green-Mode Fairchild Power Switch
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo
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FSGM0465RBWDTU datasheet

1 Page

FSGM0465RBWDTU pdf
Electrical Characteristics
TJ=25°C unless otherwise specified.
Symbol
Parameter
SenseFET Section
BVDSS
IDSS
RDS(ON)
CISS
COSS
tr
tf
td(on)
td(off)
Drain-Source Breakdown Voltage
Zero-Gate-Voltage Drain Current
Drain-Source On-State Resistance
Input Capacitance(13)
Output Capacitance(13)
Rise Time
Fall Time
Turn-on Delay Time
Turn-off Delay Time
Control Section
fS
ΔfS
DMAX
DMIN
IFB
VSTART
VSTOP
VOP
tS/S
Switching Frequency
Switching Frequency Variation(13)
Maximum Duty Ratio
Minimum Duty Ratio
Feedback Source Current
UVLO Threshold Voltage
VCC Operating Range
Internal Soft-Start Time
Burst-Mode Section
VBURH
VBURL
Hys
Burst-Mode Voltage
Protection Section
ILIM Peak Drain Current Limit
VSD Shutdown Feedback Voltage
IDELAY
tLEB
Shutdown Delay Current
Leading-Edge Blanking Time(13)(14)
VOVP Over-Voltage Protection
tOSP
www.DataSheeVt4OUSP.comOPruottpeucttiSohno(1r3t)
tOSP_FB
Threshold Time
Threshold VFB
VFB Blanking Time
TSD Thermal Shutdown Temperature(13)
Hys
Conditions
Min. Typ. Max.
VCC=0V, ID=250μA
650
VDS=520V, TA=+125°C
250
VGS=10V, ID=1A
2.1 2.6
VDS=25V, VGS=0V, f=1MHz
436
VDS=25V, VGS=0V, f=1MHz
65
VDS=325V, ID=4A, RG=25
24
VDS=325V, ID=4A, RG=25
24
VDS=325V, ID=4A, RG=25
13
VDS=325V, ID= 4A, RG=25
30
VCC=14V, VFB=4V,
-25°C < TJ < +125°C
VCC=14V, VFB=4V
VCC=14V, VFB=0V
VFB=0
VFB=0V, VCC Sweep
After Turn-on, VFB=0V
VSTR=40V, VCC Sweep
60 66 72
±5 ±10
65 70 75
0
160 210 260
11 12 13
7.0 7.5 8.0
13 23
15
VCC=14V, VFB Sweep
0.6 0.7 0.8
0.4 0.5 0.6
200
di/dt=300mA/μs
VCC=14V, VFB Sweep
VCC=14V, VFB=4V
VCC Sweep
OSP Triggered when
tON<tOSP & VFB>VOSP
(Lasts Longer than tOSP_FB)
Shutdown Temperature
Hysteresis
2.45
5.5
2.5
23.0
1.0
1.8
2.0
+130
2.70
6.0
3.3
300
24.5
1.2
2.0
2.5
+140
+30
2.95
6.5
4.1
26.0
1.4
2.2
3.0
+150
Unit
V
μA
pF
pF
ns
ns
ns
ns
kHz
%
%
%
μA
V
V
V
ms
V
V
mV
A
V
μA
ns
V
μs
V
μs
°C
°C
© 2009 Fairchild Semiconductor Corporation
FSGM0465RB • Rev. 1.0.2
Continued on the following page…
www.fairchildsemi.com
5

5 Page

FSGM0465RBWDTU arduino
4. Protection Circuits: The FSGM0465RB has several
self-protective functions, such as Overload Protection
(OLP), Abnormal Over-Current Protection (AOCP),
Output-Short Protection (OSP), Over-Voltage Protection
(OVP), and Thermal Shutdown (TSD). All the
protections are implemented as auto-restart. Once the
fault condition is detected, switching is terminated and
the SenseFET remains off. This causes VCC to fall.
When VCCB B falls to the Under-Voltage Lockout (UVLO)
stop voltage of 7.5V, the protection is reset and the
startup circuit charges the VCC capacitor. When VCC
reaches the start voltage of 12.0V, the FSGM0465RB
resumes normal operation. If the fault condition is not
removed, the SenseFET remains off and VCC drops to
stop voltage again. In this manner, the auto-restart can
alternately enable and disable the switching of the
power SenseFET until the fault condition is eliminated.
Because these protection circuits are fully integrated
into the IC without external components, the reliability is
improved without increasing cost.
Figure 19. Auto-Restart Protection Waveforms
increasing until it reaches 6.0V, when the switching
operation is terminated, as shown in Figure 20. The
delay time for shutdown is the time required to charge
CFB from 2.4V to 6.0V with 3.3µA. A 25 ~ 50ms delay
is typical for most applications. This protection is
implemented in auto-restart mode.
Figure 20. Overload Protection
4.2 Abnormal Over-Current Protection (AOCP):
When the secondary rectifier diodes or the
transformer pins are shorted, a steep current with
extremely high di/dt can flow through the SenseFET
during the minimum turn-on time. Even though the
FSGM0465RB has overload protection, it is not
enough to protect the FSGM0465RB in that abnormal
case; since severe current stress is imposed on the
SenseFET until OLP is triggered. The FSGM0465RB
internal AOCP circuit is shown in Figure 21. When
the gate turn-on signal is applied to the power
SenseFET, the AOCP block is enabled and monitors
the current through the sensing resistor. The voltage
across the resistor is compared with a preset AOCP
level. If the sensing resistor voltage is greater than
the AOCP level, the set signal is applied to the S-R
latch, resulting in the shutdown of the SMPS.
4.1 Overload Protection (OLP): Overload is defined
as the load current exceeding its normal level due to
an unexpected abnormal event. In this situation, the
protection circuit should trigger to protect the SMPS.
However, even when the SMPS is in normal
operation, the overload protection circuit can be
triggered during the load transition. To avoid this
undesired operation, the overload protection circuit is
designed to trigger only after a specified time to
determine whether it is a transient situation or a true
overload situation. Because of the pulse-by-pulse
current limit capability, the maximum peak current
through the SenseFET is limited and, therefore, the
www.DataShmeeatx4iUm.ucomminput power is restricted with a given input
voltage. If the output consumes more than this
maximum power, the output voltage (VOUT) decreases
below the set voltage. This reduces the current
through the opto-coupler LED, which also reduces
the opto-coupler transistor current, thus increasing
the feedback voltage (VFB). If VFB exceeds 2.4V, D1 is
blocked and the 3.3µA current source starts to charge
CFB slowly up. In this condition, VFB continues
© 2009 Fairchild Semiconductor Corporation
FSGM0465RB • Rev. 1.0.2
10
Figure 21. Abnormal Over-Current Protection
www.fairchildsemi.com

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