Datasheet KA3S1265RF Datasheet (Fairchild Semiconductor)

©2001 Fairchild Semiconductor Corporation

www.fairchildsemi.com

Rev.1.0.2

Features

• Wide operatimg frequency range up to (150kHz)

• Pulse by pulse over current limiting

• Over load protection

• Over voltage protecton (Min. 23V)

• Internal thermal shutdown function

• Under voltage lockout

• Internal high voltage sense FET

• External sync terminal

• Auto Restart Mode

Description

The Fairchild Power Switch(FPS) product family is specially
designed for an off line SMPS with minimal extern al
components. The Fairchild Power Switch(FPS) consist of
high voltage power SenseFET and current mode PWM IC.
Included control IC features a trimmed oscillator, under
voltage lock-out, 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

CC

switching converter 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 C-TV power supply.

TO-3P-5L

1. DRAIN 2. GND 3. Vcc 4. FB 5. Sync

TO-3PF-5L

1

1

Internal Block Diagram

#3 V

CC

32V

2

µ

A

5V

2.5R
1R

1mA

0.1V

+

−

OVER VOLTAGE S/D

+

−

7.5V

25V

Thermal S/D

S
R

Q

Power on reset

+

−

L.E.B

S
R

Q

OSC

5V

Vref

Internal

bias

Good

logic

SFET

#1 DRAIN

#2 GND

#4 FB

#5 Sync

9V

+

−

6.4V

KA3S1265R/KA3S1265RF/
KA3S1265RD

Fairchild Power S witch(FPS)

KA3S1265R/KA3S1265RF/KA3S1265RD

2

Absolute Maximum Ratings

Note:

1. Tj=25°C to 150°C

2. Repetitive rating: Pulse width limited by maximum juncti on temperature

3. L=10mH, V

DD=

50V, RG=27Ω, starting Tj=25 °C

Characteristic Symbol Value Unit

Maximum drain voltage

(1)

V

D,MAX

650 V

Drain-gate voltage (R

GS

=1MΩ)

V

DGR

650 V

Gate-source (GND) voltage

V

GS

±30 V

Drain current pulsed

(2)

I

DM

48.0 A

DC

Single pulsed avalanche energy

(3)

E

AS

785 mJ

Continuous drain current (T

C

=25°C)

I

D

12 A

DC

Continuous drain current (TC=100°C)

I

D

8.4 A

DC

Maximum supply voltage

V

CC,MAX

30 V

Input voltage range

V

FB

−0.3 to V

SD

V

Total power dissipation

P

D

269 W

Derating

2.17 W/°C

Operating ambient temperature

T

A

−25 to +85 °C

Storage temperature

T

STG

−55 to +150 °C

KA3S1265R/KA3S1265RF/KA3S1265RD

3

Electrical Characteristics (SFET part)

(Ta = 25°C unless otherwise specified)

Note:

Pulse test: P ulse width ≤ 300µS, duty cycle ≤ 2%

Characteristic Symbol Test condition Min. Typ. Max. Unit

Drain-source breakdown voltage BV

DSS

VGS=0V, ID=50µA 650 - - V

Zero gate voltage drain current I

DSS

VDS=Max., Rating,
V

GS

=0V

--50µA

V

DS

=0.8Max., Rating,

V

GS

=0V, TC=125°C

- - 200 mA

Static drain-source on resistance

(note)

R

DS(ON)VGS

=10V, ID=6.0A - 0.72 - W

Forward transconductance

(note)

gfs VDS=50V, ID=6.0A 5.7 - - S

Input capacitance Ciss

V

GS

=0V, VDS=25V,

f=1MHz

- 2700 ­pFOutput capacitance Coss - 300 -

Reverse transfer capacitance Crss - 61 ­Turn on delay time t

d(on)

VDD=0.5BV

DSS

, ID=12.0A
(MOSFET switching
time are essentially
independent of
operating temperature)

-18-

nS

Rise time tr - 37 ­Turn off delay time t

d(off)

-88­Fall time tf - 36 ­Total gate charge

(gate-source+gate-drain)

Qg

V

GS

=10V, ID=12.0A,

V

DS

=0.5BV

DSS

(MOSFET
switching time are
essentially independent of
operating temperature)

- - 140
nC

Gate-source charge Qgs - 20 ­Gate-drain (Miller) charge Qgd - 69 -

S

1

R

--- -=

KA3S1265R/KA3S1265RF/KA3S1265RD

4

Electrical Charcteristics (CONTROL part)

(Ta = 25°C unless otherwise specified)

Note:

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

2. These parameters, although guaranteed, are tested in EDS(water test) process

3.The amplitude of the sync. pulse is recommended to be between 2V and 3V for stable sync. function.

Characteristic Symbol Test condition Min. Typ. Max. Unit

UVLO SECTION

Start threshold voltage V

START

-141516V

Stop threshold voltage V

STOP

After turn on 9 10 11 V

OSCILLATOR SECTION

Initial accuracy FOSC Ta=25°C182022kHz
Frequency change with temperature

(2)

∆F/∆T −25°C ≤ Ta ≤ +85°C-±5 ±10 %

Maximum duty cycle Dmax - 92 95 98 %

FEEDBACK SECTION

Feedback source current I

FB

Ta=25°C, Vfb=GND 0.8 1 1.2 mA

Shutdown feedback voltage V

SD

-6.97.58.1V

Shutdown delay current I

delay

Ta=25°C, 5V ≤ Vfb ≤ V

SD

1.4 1.8 2.2 µA

SYNC. & SOFT START SECTION

Soft start voltage V

SS

VFB=2V 4.7 5.0 5.4 V

Soft start current I

SS

Sync & S/S=GND 0.8 - - mA

Sync threshold voltage V

SYTH

KA3S1265R,KA3S1265RF 6.0 6.4 6.8

VSync threshold voltage(ON)

(3)

V

SYTH(ON)

KA3S1265RD

6.86 7.23 7.60

Sync threshold voltage(OFF)

(3)

V

SYTH(OFF)

5.92 6.23 6.54

REFERENCE SECTION

Output voltage

(1)

Vref Ta=25°C 4.80 5.00 5.20 V

Temperature stability

(1)(2)

Vref/∆T −25°C ≤ Ta ≤ +85°C-0.30.6mV/°C

CURRENT LIMIT (SELF-PROTECTION) SECTION

Peak Current Limit I

OVER

Max. inductor current 7.04 8.00 8.96 A

PROTECTION SECTION

Thermal shutdown temperature (Tj)

(1)

T

SD

- 140 160 - °C

TOTAL DEVICE SECTION

Start Up current I

START

VCC=14V 0.1 0.3 0.55 mA

Operating supply current
(Control Part Only)

I

OP

Ta=25°C 6 12 18 mA

V

cc

Zener voltage V

Z

ICC=20mA 30 32.5 35 V

KA3S1265R/KA3S1265RF/KA3S1265RD

5

Typical Performance Characteristics

(These characteristic graphs are normalized at Ta = 25°C)

Fig. 1 O p era t ing F r equenc y

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

1.2

-25 0 25 50 75 100 125 150

Fosc

Fig.2 Feedback Sourc e Current

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

1.2

-25 0 25 50 75 100 125 150

Ifb

Fig.3 Operating Cur rent

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

1.2

-25 0 25 50 75 100 125 150

Iop

Fig.4 Max Inductor Current

0.8

0.85

0.9

0.95

1

1.05

1.1

-25 0 25 50 75 100 125 150

Ipeak

Fig.5 Start up Current

0.5

0.7

0.9

1.1

1.3

1.5

-25 0 25 50 75 100 125 150

Istart

Fig.6 Star t Threshold Voltage

0.85

0.9

0.95

1

1.05

1.1

1.15

-25 0 25 50 75 100 125 150

Vstart

Temperature [°C] Temperature [°C]

Temperature [

°

C

] Temperature [

°

C

]

Temperature [°

C

]Temperature [°C]

Figure 1. Operating Frequency Figure 2. Feedback Source Current

Figure 3. Operating Supply Current Figure 4. Peak Current Limit

Figure 5. Start up Current Figure 6. Start Threshold Voltage

Iover

I

ST

V

th(H)

IFB

KA3S1265R/KA3S1265RF/KA3S1265RD

6

Typical Performance Characteristics (Continued)

(These characteristic graphs are normalized at Ta = 25°C)

Fig.7 Stop Threshold V oltage

0.85

0.9

0.95

1

1.05

1.1

1.15

-25 0 25 50 75 100 125 150

Vstop

F i g .8 Maxi mum D u ty Cycl e

0.85

0.9

0.95

1

1.05

1.1

1.15

-25 0 25 50 75 100 125 150

Dmax

Fig.9 V c c Zener Voltage

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

1.2

-25 0 25 50 75 100 125 150

Vz

Fig.10 Shut dow n Feedback Voltag e

0.85

0.9

0.95

1

1.05

1.1

1.15

-25 0 25 50 75 100 125 150

Vsd

Fig.11 Shut do wn Delay Current

0.8

0.85

0.9

0.95

1

1.05

1.1

1.15

1.2

-25 0 25 50 75 100 125 150

Idelay

Fig.12 Over Voltage Protection

0.85

0.9

0.95

1

1.05

1.1

1.15

-25 0 25 50 75 100 125 150

Vovp

Temperature [°C] Temperature [°C]

Temperature [°

C

] Temperature [°C]

Temperature [°

C

]Temperature [°C]

Figure 7. Stop Threshold Voltage Figure 8. Maximum Duty Cycle

Figure 9. V

CC

Zener Voltage Figure 10. Shutdown Feedback Voltage

Figure 11. Shutdown Delay Current Figure 12. Over Voltage Protection

V

th(L)

KA3S1265R/KA3S1265RF/KA3S1265RD

7

Typical Performance Characteristics (Continued)

(These characteristic graphs are normalized at Ta = 25°C)

Figure13. Soft Start Voltage

Figure 14. Static Drain-Source on Resistance

Fig.13 Soft Start Voltage

0.85

0.9

0.95

1

1.05

1.1

1.15

-25 0 25 50 75 100 125 150

Vss

Fig.14 Drain Source Turn-on

Resistance

0

0.5

1

1.5

2

2.5

-25 0 25 50 75 100 125 150

Rdson

R

DS(on)

KA3S1265R/KA3S1265RF/KA3S1265RD

8

Package Dimensions

TO-3P-5L

KA3S1265R/KA3S1265RF/KA3S1265RD

9

Package Dimensions

(Continued)

TO-3P-5L (Forming)

KA3S1265R/KA3S1265RF/KA3S1265RD

10

Package Dimensions

(Continued)

TO-3PF-5L

KA3S1265R/KA3S1265RF/KA3S1265RD

11

Package Dimensions

(Continued)

TO-3PF-5L(Forming)

KA3S1265R/KA3S1265RF/KA3S1265RD

10/17/01 0.0m 001

Stock#DSxxxxxxxx

 2001 Fairchild Semiconductor Corporation

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

2. A critical component in any component of a life support
device or sys tem 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 tiveness.

www.fairchildsemi.com

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTION OR DES IGN. 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 RI GHTS OF OTHERS.

Ordering Information

TU : Non Forming Type
YDTU : Forming Type

Product Number Package Rating Operating Temperature

KA3S1265R-YDTU TO-3P-5L

650V, 12A -25°C to +85°C

KA3S1265R-TU TO-3P-5L(Forming)
KA3S1265RF-YDTU TO-3PF-5L

650V, 12A -25°C to +85°C

KA3S1265RF-TU TO-3PF-5L(Forming)
KA3S1265RD-YDTU TO-3P-5L

650V, 12A -25°C to +85°C

KA3S1265RD-TU TO-3P-5L(Forming)