Datasheet KA5P0680C Datasheet (Fairchild Semiconductor)

KA5P0680C

Fairchi ld Pow er Sw itch( FP S)

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 voltag e power SenseFET an d 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 tempe rature
compensated precision current sources for loop
compensation and fault protection circuitry. compared to dis­crete MOSFET and cont r o l l e r or R
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

1

1. Drain 2. GND 3. VCC 4. FB 5. CT

switching

CC

Internal Block Diagram

Vcc

3

Ct

5

5uA

Feedback

©2003 Fairchild Semiconductor Corporation

4

SOFT-START
(5mS)/( 0 ~ 5V )

OLP
(Vfb=7V)

OVP
(Vcc=27V)

15V/9V

VREFVCC

2V

0.7V

UVLO

900uA

2.5R

AUTO
RESTART

Drain

1

VCC

VG
LIMIT
CIRCUIT

5uA

Shutdown Latch

OCL
(Vs=1.1V)

S
R

VG

OUTPUT OFF

Q

SenseFET

Vs

Rsense

GND

2

Vref

2.5V

OSC

CLK

R

S
R

0.4V/0.6V

S
R

0.5V

Q

Q

LEB

VZ

OUTPUT OFF

BIAS

GOOD LOGIC

SRQ

PS MODE

1mS

TSD

(Tj=170 ℃)
POWER-ON
RESET

Rev.1.0.3

KA5P0680C

Absolute Maximum Ratings

(Ta=25°C, unless otherwise specified)

Parameter Symbol Value Unit

Drain-Gate Voltage (R

=1MΩ)V

GS

Gate-Source (GND) Voltage V
Drain Current Pulsed

(2)

Single Pulsed Avalanche Energy
Avalanche Current
Continuous Drain Current (T

(4)

=25°C) I

C

(3)

I

E

Continuous Drain Current (TC=100°C) I
Maximum Supply Voltage V

CC,MAX

Input Voltage Range V
Total Power Dissipation

Darting 1.21 W/°C
Operating Ambient Temperature T
Storage Temperature T

DGR

GS

DM

AS

I

AS

D
D

FB

P

D

A

STG

800 V
±30 V

24.0 A
455 mJ

27 A

6.0 A

4.0 A
30 V

-0.3 to 7V V
150 W

-25 to +85 °C

-55 to +150 °C

DC

DC
DC

Note:

1. T

= 25°C to 150°C

j

2. Repetitive rating: Pulse width limited by maximum junction temperature

3. L = 24mH, starting T

4. L = 13µH, starting T

= 25°C

j

= 25°C

j

2

KA5P0680C

Electrical Characteristics (SFET Part)

(Ta=25°C unless otherwise specified)

Parameter Symbol Condition Min. Typ. Max. Unit

Drain-Source Breakdown Voltage BV

Zero Gate Voltage Drain Current I

Static Drain-Source on Resistance
Forward Transconductance

(Note)

(Note)

DSS

DSS

R

DS(ON)VGS

gfs VDS=15V, ID=4.0A 1.5 2.5 - S

Input Capacitance Ciss

Reverse Transfer Capacitance Crss - 42 ­Turn on Delay Time td(on) V
Rise Time tr - 150 ­Turn Off Delay Time td(off) - 300 ­Fall Time tf - 130 ­Total Gate Charge

(Gate-Source+Gate-Drain)

Qg

Gate-Source Charge Qgs - 16 ­Gate-Drain (Miller) Charge Qgd - 27 -

VGS=0V, ID=50µA 800 - - V
VDS=Max., Rating,

V

=0V

GS

=0.8Max., Rating,

V

DS

V

=0V, TC=125°C

GS

--50µA

- - 200 µA

=10V, ID=4.0A - 1.6 2.0 Ω

- 1600 -

=0V, VDS=25V,

V

GS

f=1MHz

DD

=0.5BV

DSS

, ID=7.0A

-60­(MOSFET swi tching
time are essentially
independent of
operating temperature)

V

=10V, ID=7.0A,

V

GS
DS

=0.5BV

(MOSFET

DSS

-70­switching time are

essentially independent of
operating temperature)

pFOutput Capacitance Coss - 140 -

nS

nC

Note:

1. Pulse test: Pulse width ≤ 300µS, duty ≤ 2%

2.

1

S

--- -=

R

3

KA5P0680C

Electrical Characteristics (Control Part)

(Continued)

(Ta=25°C unless otherwise specified)

Parameter Symbol Test Condition Min. Typ. Max. Unit
UVLO SECTION

Start Threshold Voltage V
Min.Operating Voltage After Turn On V

START

STOP

-141516V

- 8.4 9 9.6 V

OSCILLATOR SECTION

Initial Frequency F
Temperature Stability

(Note 1)

∆F

Maximum Duty Cycle D

OSC

OSC

MAX

CT=2n 61 67 73 kHz

-25°C < Ta ≤ 85°C0±5±10%
RT=21kΩ 85 88 91 %

Offset Voltage Voffset - 0.5 0.55 0.6 %

FEEDBACK SECTION

Feedback Source Current I
Shutdown Feedback Voltage V
Shutdown Delay Current I

DELAY

FB

sd

V

= 0V 0.9 1.1 1.3 mA

sc

V

≥ 6V 6.3 6.9 7.5 V

fb

4V ≤ Vfb ≤ V

sd

456µA

CURRENT LIMIT (SELF-PROTECTION) SECTION

Peak Current Limit I

OVER

Max. inductor current 3.52 4 4.48 A

PROTECTION SECTION

Over Voltage Protection V
Thermal Shutdown Temp. T

OVP

SD

Vcc ≥ 22V 25 27 29 V

- 150 170 - °C

POWER-SAVING MODE SECTION

Power Saving Mode Feedback Volt. V
Power Saving Reset Feedback Volt. V
Power Saving Current I
Power Saving Mode Fb Current I

F(PS)
F(RE)

PS
pfb

VCC=16V 0.3 0.4 0.5 V
VCC=16V 0.5 0.6 0.7 V
VCC=16V - 0.3 0.4 mA
VCC=16V 3 4 5 uA

TOTAL DEVICE SECTION

Start Up Current Istart Vcc=14V - 0.1 0.2 mA
Operating Supply Current I

OP

Vcc ≤ 28V - 10 18 mA

Note:

1. These parameters, although guaranteed, are not 100% tested in production

4

Typical Performance Characteristics

KA5P0680C

vstart

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

vstop

9.60

9.30

V

9.00

8.70

mA

V

Istart

0.15

0.12

0.09

0.06

0.03

-25 0 25 50 75 100 125 150
temp

Figure 2. Stop Threshold Voltage

Vovp

29.00

28.00

27.00

26.00

8.40

-25 0 25 50 75 100 125 150

Figure 3. Start Up Current Figure 4. Over Voltage Protection

Ifb

1.10

1.00

0.90

m

A

0.80

0.70

-25 0 25 50 75 10 0 125 150

Figure 5. Feedback Source Current

temp

temp

25.00

-25 0 25 50 75 100 125 150

Idelay

6.00

5.50

uA

5.00

4.50

4.00

-25 0 25 50 75 100 125 150

Figure 6. Shutdown Delay Current

temp

temp

5

KA5P0680C

Typical Performance Characteristics

Vsd

7.50

7.20

6.90

V

6.60

6.30

-25 0 25 50 75 100 125 150
temp

Figure 7. Shutdown Feedback Voltage

VF(RE)

0.70

0.65

(Continued)

4.50

4.25

A

4.00

3.75

3.50

Iov er

-25 0 25 50 75 100 125 150
temp

Figure 9. Pe ak Current Lim it

Ipf b

6

5

V

0.60

0.55

0.50

-25 0 25 50 75 100 125 150
temp

Figure 9. Power-Saving Reset Feedback Voltage

uA

Ips

400

300

200

100

0

-25 0 25 50 75 100 125 150
temp

4

uA

3

2

-25 0 25 50 75 100 125 150
temp

Figure 10. Powe r-Saving Mode Feedback Curre nt

VF(PS)

0.50

0.45

V

0.40

0.35

0.30

-25 0 25 50 75 100 125 150
temp

Figure 11. Power-Saving Current

Figure 12. Power-S aving Mode Feedbac k Voltage

6

KA5P0680C

Typical Performance Characteristics

Fosc

73.00

70.00

Khz

67.00

64.00

61.00

-25 0 25 50 75 100 125 150
temp

Figure 13. Operating Freguency

(Continued)

%

Dmax

91.00

89.50

88.00

86.50

85.00

-25 0 25 50 75 100 125 150
temp

Figure 14. Maximum Duty Cycle

7

Package Dimensions

KA5P0680C

TO-220-5L

8

KA5P0680C

Package Dimensions

(Continued)

TO-220-5L(Forming)

9

KA5P0680C

Ordering Information

Product Number Package Rating Topr (°C)

KA5P0680CTU TO-220-5L
KA5P0680CYDTU TO-220-5L(Forming)

TU : Non Forming Type
YDTU : Forming Type

800V, 6A -25°C to +85°C

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHA NGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH ILD 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 IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.

LIFE SUPPORT POL I CY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:

1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with

2. A critical component in any component of a life support
device or sy stem whose failure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .

instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.

www.fairchildsemi.com

8/25/03 0.0m 001

 2003 Fairchild Semiconductor Corporation

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