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PDF KA5P0680C Data sheet ( Hoja de datos )

Número de pieza KA5P0680C
Descripción Fairchild Power Switch(FPS)
Fabricantes Fairchild 
Logotipo Fairchild Logotipo



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KA5P0680C
Fairchild Power Switch(FPS)
www.fairchildsemi.com
Features
• Adjustable Switching Frequency
• Intelligent Power Saving Mode
• Pulse by Pulse Current Limiting
• Over Current Latch Protection
• Over Voltage Protection
• Internal Thermal Shutdown Function
• Built-in Soft Start Function
• Internal High Voltage Sense FET
• Auto-Restart Mode
Description
The Fairchild Power Switch(FPS) product family is specially
designed for an off-line SMPS with minimal external
components. The Fairchild Power Switch(FPS) consist of
high voltage power SenseFET and current mode PWM IC.
Included PWM controller features integrated fixed
oscillator, under voltage lock out, leading edge blanking,
optimized gate turn-on/turn-off driver, thermal shut down
protection, over voltage protection, and temperature
compensated precision current sources for loop
compensation and fault protection circuitry. compared to dis-
crete MOSFET and controller or RCC switching
converter solution, a Fairchild Power Switch(FPS) can
reduce total component count, design size, and weight and at
the same time increase efficiency, productivity, and system
reliability.It has a basic platform well suited for cost
effective design in PC SMPS with Power Saving function.
TO-220-5L
Internal Block Diagram
1
1. Drain 2. GND 3. VCC 4. FB 5. CT
Ct 5
Feedback 4
Vcc
3
UVLO
VCC
15V/9V
VREF
5uA 900uA
Vref
2.5V
OSC CLK
BIAS
GOOD LOGIC
VG
LIMIT
CIRCUIT
Drain
1
SenseFET
SQ
R
VG
2.5R
R
SOFT-START
(5mS)/( 0 ~ 5V )
2V
OLP
(Vfb=7V)
OVP
(Vcc=27V)
0.7V
AUTO
RESTART
0.5V
S
Q
R
0.4V/0.6V
S
Q
R
LEB
VZ
VCC
PS MODE
5uA
Vs
Rsense
2 GND
1mS
OCL
(Vs=1.1V)
OUTPUT OFF
TSD
(Tj=170 )
POWER-ON
RESET
S
Q
R
OUTPUT OFF
Shutdown Latch
©2003 Fairchild Semiconductor Corporation
Rev.1.0.3

1 page




KA5P0680C pdf
Typical Performance Characteristics
KA5P0680C
v s tar t
16.00
15.50
V 15.00
14.50
14.00
-25
0
25 50 75 100 125 150
temp
Figure 1. Start Threshhold Voltage
v s top
9.60
9.30
V 9.00
8.70
8.40
-25
0
25 50 75 100 125 150
temp
Figure 3. Start Up Current
If b
1.10
1.00
mA 0.90
0.80
0.70
-25
0
25 50 75 100 125 150
temp
Figure 5. Feedback Source Current
Is tart
0.15
0.12
mA
0.09
0.06
0.03
-25 0 25 50 75 100 125 150
temp
Figure 2. Stop Threshold Voltage
V ovp
29.00
28.00
V 27.00
26.00
25.00
-25
0
25 50 75 100 125 150
temp
Figure 4. Over Voltage Protection
Idelay
6.00
5.50
uA 5.00
4.50
4.00
-25 0 25 50 75 100 125 150
temp
Figure 6. Shutdown Delay Current
5

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