ka2s0680b Fairchild Semiconductor, ka2s0680b Datasheet

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ka2s0680b

Manufacturer Part Number
ka2s0680b
Description
Fairchild Power Switch Fps
Manufacturer
Fairchild Semiconductor
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ka2s0680b-FYDTU
Manufacturer:
Samsung/Fsc
Quantity:
20 678
Features
• Wide operating frequency range up to 150KHz
• Pulse by pulse over current limiting
• Over load protection
• Over voltage protection (Min. 23V)
• Internal thermal shutdown function
• Under voltage lockout
• Internal high voltage sense FET
• External sync terminal
• Latch up Mode
Internal Block Diagram
©2001 Fairchild Semiconductor Corporation
KA2S0680B
Fairchild Power Switch(FPS)
#5 Sync
#3 V
#4 FB
CC
5V
2 A
7.5V
25V
32V
1mA
+
+
9V
+
2.5R
OVER VOLTAGE S/D
1R
6.4V
Thermal S/D
+
OSC
Vref
5V
0.1V
L.E.B
Good
logic
S
R
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 SenseFETand current mode PWM controller IC.
PWM controller features integrated fixed oscillator, under
voltage lockout, leading edge blanking, optimized gate turn-on/
turn-off driver, thermal shut down protection, over voltage
protection, temperature compensated precision current sources
for loop compensation and fault protection circuit. compared to
discrete MOSFET and controller or R
solution, a Fairchild Power Switch(FPS) can reduce total
component count, design size, weight and at the same time
increase & efficiency, productivity, and system reliability. It has
a basic platform well suited for cost effective design in monitor
power supply.
1. DRAIN 2. GND 3. V
Q
Power on reset
Internal
TO-3P-5L
bias
S
R
1
Q
CC
SFET
4. FB 5. Sync
www.fairchildsemi.com
CC
#1 DRAIN
#2 GND
switching converter
Rev.1.0.2

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ka2s0680b Summary of contents

Page 1

... KA2S0680B Fairchild Power Switch(FPS) Features • Wide operating frequency range up to 150KHz • Pulse by pulse over current limiting • Over load protection • Over voltage protection (Min. 23V) • Internal thermal shutdown function • Under voltage lockout • Internal high voltage sense FET • ...

Page 2

... KA2S0680B Absolute Maximum Ratings Parameter (1) Maximum Drain voltage Drain Gate voltage (R = Gate source (GND) voltage (2) Drain current pulsed Single pulsed avalanche energy (4) Avalanche current Continuous drain current (T = Continuous drain current (T =100 C) C Maximum Supply voltage Input voltage range ...

Page 3

... GS DS Coss f=1MHz Crss t V =0.5BV d(on) DD DSS (MOSFET switching tr time are essentially t d(off) independent of tf operating temperature) V =10V, I =6.0A =0.5BV DS DSS switching time are Qgs essentially independent of Qgd operating temperature) 2% KA2S0680B Min. Typ. Max. 800 - - - - 200 - 1.6 2.0 1.5 2 1600 - - 140 - - =6. ...

Page 4

... KA2S0680B Electrical Characteristics (CONTROL part) (Ta=25 C unless otherwise specified) Parameter UVLO SECTION Start threshold voltage Stop threshold voltage OSCILLATOR SECTION Initial accuracy Frequency change with temperature Maximum duty cycle FEEDBACK SECTION Feedback source current Shutdown Feedback voltage Shutdown delay current SYNC. & SOFT START SECTION ...

Page 5

... C Figure 4. Peak Current Limit 1.15 1.1 1.05 V Vstart th(H) 1 0.95 0.9 0.85 100 125 150 ] C Figure 6. Start Threshold Voltage KA2S0680B Fig.2 Feedback Source Current 100 125 150 Temperature [ ] C Fig.4 Max Inductor Current 100 125 150 Temperature [ ] C Fig.6 Start Threshold Voltage ...

Page 6

... KA2S0680B Typical Performance Characteristics (These characteristic graphs are normalized at Ta=25 C) Fig.7 Stop Threshold Voltage 1.15 1.1 1.05 V Vstop th(L) 1 0.95 0.9 0.85 - Temperature [ Figure 7. Stop Threshold Voltage Fig.9 Vcc Zener Voltage 1.2 1.15 1.1 1. 0.95 0.9 0.85 0.8 - Temperature [ Figure 9. V Zener Voltage CC Fig.11 Shutdown Delay Current 1.2 1.15 1.1 1.05 Idelay 1 0.95 0.9 0.85 0.8 -25 ...

Page 7

... Ta=25 C) Fig.13 Soft Start Voltage 1.15 1.1 1.05 Vss 1 0.95 0.9 0.85 - Temperature [ Figure 13. Soft Start Voltage (Continued) 2.5 2 1.5 Rdson ( ) 1 0.5 0 100 125 150 ] C Figure 14. Static Drain-Source on Resistance Fig.14 Drain Source Turn-on Resistance - 100 125 150 Temperature [ ] C KA2S0680B 7 ...

Page 8

... KA2S0680B Package Dimensions 8 TO-3P-5L ...

Page 9

... Package Dimensions (Continued) TO-3P-5L (Forming) KA2S0680B 9 ...

Page 10

... KA2S0680B Ordering Information Product Number Package KA2S0680B-TU TO-3P-5L KA2S0680B-YDTU TO-3P-5L(Forming Non Forming Type YDTU : Forming Type DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS ...

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