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PDF DM0465R Data sheet ( Hoja de datos )
| Número de pieza | DM0465R | |
| Descripción | FSDM0465R | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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 1. Green Mode Fairchild Power Switch  Hay una vista previa y un enlace de descarga de DM0465R (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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FSCM0465R
Green Mode Fairchild Power Switch (FPS™)
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Features
Internal Avalanche Rugged SenseFET
Low Start-up Current (max. 40µA)
Low Power Consumption; under 1W at 240VAC and
0.4W Load
Precise Fixed Operating Frequency (66kHz)
Frequency Modulation for Low EMI
Pulse-by-Pulse Current Limiting (Adjustable)
Over-Voltage Protection (OVP)
Overload Protection (OLP)
Thermal Shutdown Function (TSD)
Auto-Restart Mode
Under-Voltage Lock Out (UVLO) with Hysteresis
Built-in Soft-Start (15ms)
Applications
SMPS for VCR, SVR, STB, DVD, and DVCD
Adaptor
SMPS for LCD Monitor
Description
The FSCM0465R is an integrated Pulse-Width
Modulator (PWM) and SenseFET specifically designed
for high-performance offline Switch Mode Power
Supplies (SMPS) with minimal external components.
This device is an integrated high-voltage power-
switching regulator that combines an avalanche rugged
SenseFET with a current mode PWM control block. The
PWM controller includes an integrated fixed-frequency
oscillator, under-voltage lockout, leading edge blanking
(LEB), optimized gate driver, internal soft-start,
temperature-compensated precise current sources for a
loop compensation, and self-protection circuitry.
Compared with a discrete MOSFET and PWM controller
solution, it can reduce total cost, component count, size,
and weight while simultaneously increasing efficiency,
productivity, and system reliability. This device is a basic
platform well suited for cost-effective designs of flyback
converters.
Related Application Notes
AN-4137: Design Guidelines for Off-line Flyback
Converters Using Fairchild Power Switch (FPS)
AN-4140: Transformer Design Consideration for
Off-line Flyback Converters using Fairchild Power
Switch
AN-4141: Troubleshooting and Design Tips for
Fairchild Power Switch Flyback Applications
AN-4148: Audible Noise Reduction Techniques for
FPS Applications
Ordering Information
Product Number Package Pb-Free Marking Code
FSCM0465RJ
D2-PAK-6L Yes
FSCM0465RJX
D2-PAK-6L
FSCM0465RIWDTU(1) I2-PAK-6L
FSCM0465RGWDTU(1) TO-220-6L
Yes
Yes
Yes
CM0465R
Note:
1. WDTU: Forming Type
FPSTM is a trademark of Fairchild Semiconductor Corporation.
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
1
BVDSS
650V
RDS(ON) Max.
2.6 Ω
Packing
Method
Tube
Tape & Reel
Tube
Tube
www.fairchildsemi.com
1 page  
Absolute Maximum Ratings
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guawrawntwee.Dd.atTahSeheet4U.com
device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables
are not guaranteed at the absolute maximum ratings.
TA = 25°C unless otherwise specified.
Symbol
BVDSS
VDGR
VGS
IDM
ID
VCC
VFB
PD
Derating
Parameter
Drain-Source Breakdown Voltage(1)
Drain-Gate Voltage (RGS=1MΩ)
Gate-Source (GND) Voltage
Drain Current Pulsed(2)
Continuous Drain Current
(TO-220-6L, I2-PAK-6L)
Continuous Drain Current
(D2-PAK-6L)
Supply Voltage
Feedback Voltage Range
TC = 25°C
TC = 100°C
TC = 25°C
TC = 100°C
Total Power Dissipation (TO-220-6L)
Value
650
650
±30
16
4.0
2.5
2.3
1.4
20
-0.3 to VCC
140
-1.1
PD
Derating
Total Power Dissipation (I2-PAK-6L)
75
-1.5
PD
Derating
Total Power Dissipation (D2-PAK-6L)
80
-0.64
TJ
TA
TSTG
Operating Junction Temperature
Operating Ambient Temperature
Storage Temperature
ESD Capability, HBM Model
(All pins except Vfb)
ESD Capability, Machine Model
(All pins except Vfb)
Internally limited
-25 to +85
-55 to +150
2.0
(GND-Vfb = 1.5kV)
(VCC-Vfb = 1.0kV)
300
(GND-Vfb = 250V)
(VCC-Vfb = 100V)
Notes:
1. Tj = 25°C to 150°C
2. Repetitive rating: Pulse-width limited by maximum junction temperature
3. TC: Case back surface temperature with infinite heat sink
Unit
V
V
V
ADC
ADC
ADC
ADC
ADC
V
V
W
W/°C
W
W/°C
W
W/°C
°C
°C
°C
kV
V
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
5
www.fairchildsemi.com
5 Page 
2.2 Constant Power Limit Circuit: Due to the circuit
delay of FPS, the pulse-by-pulse limit current increases
a little bit when the input voltage increases. This means
unwanted excessive power is delivered to the secondary
side. To compensate, the auxiliary power compensation
network in Figure 19 can be used. RLIM can adjust pulse-
by-pulse current by absorbing internal current source
(IFB: typical value is 0.9mA), depending on the ratio
between resistors. With the suggested compensation
circuit, additional current from IFB is absorbed more
proportionally to the input voltage (VDC) and achieves
constant power in wide input range. Choose RLIM for
proper current to the application, then check the pulse-
by-pulse current difference between minimum and
maximum input voltage. To eliminate the difference (to
gain constant power), Ry can be calculated by:
Ry
≅
Ilim_spec
× Vdc
×
Na
Np
Ifb × ΔIlim_comp
(3)
where, Ilim_spec is the limit current stated on the
specification; Na and Np are the number of turns for VCC
and primary side, respectively; Ifb is the internal current
source at feedback pin with a typical value of 0.9mA; and
ΔIlim_comp is the current difference which must be
eliminated. In case of capacitor in the circuit 1µF, 100V is
good choice for all applications.
2.3 Leading Edge Blanking (LEB): At the instant the
internal SenseFET is turned on, a high-cwuwrrewn.tDsaptaikSeheet4U.com
through the SenseFET usually occurs, caused by
primary-side capacitance and secondary-side rectifier
reverse recovery. Excessive voltage across the Rsense
resistor can lead to incorrect feedback operation in the
current mode PWM control. To counter this effect, the
FSCM0465R employs a leading edge blanking (LEB)
circuit. This circuit inhibits the PWM comparator for a
short time after the SenseFET is turned on.
3. Protection Circuit: The FSCM0465R has several
self-protective functions, such as 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 is improved without increasing cost. Once
the fault condition occurs, switching is terminated and
the SenseFET remains off. This causes VCC to fall.
When VCC reaches the UVLO stop voltage of 8V, the
current consumed by the FSCM0465R decreases to the
startup current (typically 20µA) and the current supplied
from the DC link charges the external capacitor (Ca)
connected to the VCC pin. When VCC reaches the start
voltage of 12V, the FSCM0465R resumes normal
operation. In this manner, the auto-restart can alternately
enable and disable the switching of the power SenseFET
until the fault condition is eliminated (see Figure 20).
Vds Power
On
Fault
occurs
Fault
removed
VDC Np
L
Vfb Drain
Vcc
Na
RLIM
I_lim GND
FSCM0465R Rev. 00
RY
compensation
network
CY
-
+
Vy
=
VDC
×
Na
Np
Figure 19. Constant power limit circuit
Vcc
12V
8V
t
Normal
FSCM0465R Rev. 00 Operation
Fault
Situation
Normal
Operation
Figure 20. Auto Restart Operation
3.1 Overload Protection (OLP): Overload is defined as
the load current exceeding a preset level due to an
unexpected event. In this situation, the protection circuit
should be activated to protect the SMPS. However, even
when the SMPS is in the normal operation, the overload
protection circuit can be activated during the load
© 2006 Fairchild Semiconductor Corporation
FSCM0465R Rev. 1.0.1
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet DM0465R.PDF ] | |
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