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PDF FSD1000 Data sheet ( Hoja de datos )
| Número de pieza | FSD1000 | |
| Descripción | Combo Fairchild Power Switch (FPS) | |
| Fabricantes | Fairchild Semiconductor | |
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www.fairchildsemi.com
FSD1000
Combo Fairchild Power Switch (FPSTM)
Features
• Current Mode Control for Main Power
• Voltage Mode Control for Auxiliary Power
• Synchronized switching of Main and Auxiliary Power
(70kHz)
• Internal Start-up Circuit
• Internal Soft Start for Auxiliary Power
• User Defined Soft Start for Main Power
• Pulse by Pulse Current Limiting
• Over Load Protection (Main : Latch Mode, Aux : Auto
Restart Mode)
• Internal Over Temperature Protection
• Vcc Under Voltage Lockout
• Line Under voltage/ Over Voltage Lockout
• Burst Mode Operation for auxiliary power to reduce the
Power Consumption in the Standby Mode
• Internal High Voltage SenseFET for auxiliary power
Application
• SMPS for PC power
• LCD TV Power Supply
Description
FSD1000 is a Fairchild Power Switch (FPS) that is specially
designed for SMPS of personal computer. This device is a
high voltage power SenseFET combined with two PWM
controllers in a single monolithic device; One is for main power
and the other is for auxiliary power. The PWM controllers
feature integrated oscillator, under voltage lockout,
optimized gate driver and temperature compensated precise
current sources for the loop compensation. This device also
includes various fault protection circuits such as line under/
over voltage lock out, over voltage protection, over load
protection and over temperature protection. Compared with
discrete MOSFET and PWM controller solution, FSD1000
can reduce total cost, component count, size and weight
simultaneously increasing efficiency, productivity and
system reliability
Typical Circuit
Main Output
VSTR
AC
IN Output
LS2
Main
PWM
Isense
LS1
S/S
VFB.aux
Aux
PWM
VFB.main
Drain
GND
ILIM
Vcc
Main Off
Aux Output
Figure 1. Typical Application circuit
©2004 Fairchild Semiconductor Corporation
Rev.1.0.2
1 page  
Absolute Maximum Ratings
(Ta=25°C, unless otherwise specified)
Parameter
Maximum Vstr Pin Voltage
Continuous SenseFET Drain Current (TC=25°C)
Maximum Supply Voltage
Input Voltage Range
Operating Ambient Temperature
Storage Temperature Range
Symbol
VSTR,MAX
ID
VCC,MAX
VFB,MAIN / VFB,AUX
TA
TSTG
Value
700
2
20
-0.3 to VSD
-25 to +85
-55 to +150
FSD1000
Unit
V
ADC
V
V
°C
°C
5
5 Page 
switching operation. In this manner, the burst operation
alternately enables and disables the switching of the power
MOSFET to reduce the switching loss in the standby mode.
Vo
Vo set
VFB
0.70V
0.50V
Ids
Vds
time
Figure 9. Waveforms of burst operation
5. Sequence of start-up and shutdown : FSD1000 has a
sequence of the startup and shutdown operation between
main and auxiliary powers. As can be seen in Figure 11,
main power starts up with 30 ms time delay after auxiliary
power starts up. When the AC line is powered off, the main
power shuts down first as the voltage of LS1 pin drops below
1.4V. The auxiliary power shuts down when the voltage of
LS1 drops below 0.8V. Figure 12 shows the shutdown and
restart sequence in the case of auto restart mode protection.
When the protection is triggered, main and auxiliary powers
shut down together. When FSD1000 restarts, the auxiliary
power starts up first and the main power starts up after 30ms.
Figure 13 shows the shutdown and restart sequence in the
case of latch mode protection. When the protection is
triggered, main and auxiliary powers shut down together and
Vcc continues being charged and discharged until Vcc is
fully discharged. The protection is reset when Vcc is
discharged below 6V by unplugging the AC line. Figure 14
shows the remote ON/OFF of the main power. The remote
ON/OFF of the main power is easily implemented using a
transistor connected to the cathode of KA431 in the main
power feedback network as shown in Figure 10. When the
transistor is turned on, the current through the opto-coupler
increases pulling down the feedback voltage to almost zero.
The main starts up with soft-start when the transistor is
turned off.
FSD1000
Main Output
Main Off
Aux Output
Figure 10. Remote ON/OFF of Main power
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet FSD1000.PDF ] | |
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