2001 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev.1.0.2
Features
Precision fixed operating frequency
KA1L0880B(50KHz),KA1M0880B(67KHz)
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
Latch up mode
Soft start
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 controller IC.
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, 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 design in either a
flyback converter or a forward converter.
TO-3P-5L
1. DRAIN 2. GND 3. V
CC
4. FB 5. S/S
1
Internal Block Diagram
#3 V
CC
32V
5
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 Soft Start
9V
KA1L0880B/KA1M0880B
Fairchild Power Switch(FPS)
KA1L0880B/KA1M0880B
2
Absolute Maximum Ratings
Notes:
1. Tj=25
C to 150
C
2. Repetitive rating: Pulse width limited by maximum junction temperature
3. L=24mH, V
DD
=50V, R
G
=25
, starting Tj=25
C
4. L=13
H, starting Tj=25
C
Parameter
Symbol
Value
Unit
Maximum Drain voltage
(1)
V
D,Max
800
V
Drain-Gate voltage (R
GS
=1M
)
V
DGR
800
V
Gate-source (GND) voltage
V
GS
30
V
Drain current pulsed
(2)
I
DM
32.0
A
DC
Single pulsed avalanche energy
(3)
E
AS
810
mJ
Avalanche current
(4)
I
AS
15
A
Continuous drain current (T
C
=25
C)
I
D
8.0
A
DC
Continuous drain current (T
C
=100
C)
I
D
5.6
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
190
W
Derating
1.54
W/
C
Operating ambient temperature
T
A
-
25 to +85
C
Storage temperature
T
STG
-
55 to +150
C
KA1L0880B/KA1M0880B
3
Electrical Characteristics (SFET part)
(Ta=25
C unless otherwise specified)
Note:
Pulse test: Pulse width
300
S, duty cycle
2%
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Drain source breakdown voltage
BV
DSS
V
GS
=0V, I
D
=50
A
800
-
-
V
Zero gate voltage drain current
I
DSS
V
DS
=Max., Rating,
V
GS
=0V
-
-
50
A
V
DS
=0.8Max., Rating,
V
GS
=0V, T
C
=125
C
-
-
200
A
Static drain source on resistance
(note)
R
DS(ON)
V
GS
=10V, I
D
=5.0A
-
1.2
1.5
Forward transconductance
(note)
gfs
V
DS
=15V, I
D
=5.0A
1.5
2.5
-
S
Input capacitance
Ciss
V
GS
=0V, V
DS
=25V,
f=1MHz
-
2460
-
pF
Output capacitance
Coss
-
210
-
Reverse transfer capacitance
Crss
-
64
-
Turn on delay time
t
d(on)
V
DD
=0.5BV
DSS
, I
D
=8.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
-
-
90
nS
Rise time
tr
-
95
200
Turn off delay time
t
d(off)
-
150
450
Fall time
tf
-
60
150
Total gate charge
(gate-source+gate-drain)
Qg
V
GS
=10V, I
D
=8.0A,
V
DS
=0.5BV
DSS
(MOSFET
switching time are
essentially independent of
operating temperature)
-
-
150
nC
Gate source charge
Qgs
-
20
-
Gate drain (Miller) charge
Qgd
-
70
-
S
1
R
----
=
KA1L0880B/KA1M0880B
4
Electrical Characteristics (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 (wafer test) process
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
UVLO SECTION
Start threshold voltage
V
START
-
14
15
16
V
Stop threshold voltage
V
STOP
After turn on
9
10
11
V
OSCILLATOR SECTION
Initial accuracy
F
OSC
KA1L0880B
45
50
55
kHz
KA1M0880B
61
67
73
Frequency change with temperature
(2)
F/
T
-
25
C
Ta
+85
C
-
5
10
%
Maximum duty cycle
Dmax
74
77
80
%
FEEDBACK SECTION
Feedback source current
I
FB
Ta=25
C, 0V
Vfb
3V
0.7
0.9
1.1
mA
Shutdown Feedback voltage
V
SD
-
6.9
7.5
8.1
V
Shutdown delay current
Idelay
Ta=25
C, 5V
Vfb
V
SD
4.0
5.0
6.0
A
SOFT START SECTION
Soft Start Voltage
V
SS
V
FB
=2V
4.7
5.0
5.3
V
Soft Start Current
I
SS
Sync & S/S=GND
0.8
1.0
1.2
mA
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
-
0.3
0.6
mV/
C
CURRENT LIMIT (SELF-PROTECTION) SECTION
Peak Current Limit
I
OVER
Max. inductor current
4.40
5.00
5.60
A
PROTECTION SECTION
Thermal shutdown temperature (Tj)
(1)
T
SD
-
140
160
-
C
Over voltage protection voltage
V
OVP
-
23
25
28
V
TOTAL DEVICE SECTION
Start Up current
I
START
V
CC
=14V
0.1
0.3
0.45
mA
Operating supply current
(control part only)
I
OP
Ta=25
C
6
12
18
mA
V
CC
zener voltage
V
Z
I
CC
=20mA
30
32.5
35
V
KA1L0880B/KA1M0880B
5
Typical Performance Characteristics
(These characteristic graphs are normalized at Ta=25
C)
Fig.1 Operating Frequency
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 Source 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 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
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 Start 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
I
over
I
ST
V
th(H)
I
OP
KA1L0880B/KA1M0880B
6
Typical Performance Characteristics
(Continued)
(These characteristic graphs are normalized at Ta=25
C)
Fig.7 Stop Threshold Voltage
0.85
0.9
0.95
1
1.05
1.1
1.15
-25
0
25
50
75
100 125 150
Vstop
Fig.8 Maximum Duty Cycle
0.85
0.9
0.95
1
1.05
1.1
1.15
-25
0
25
50
75 100 125 150
Dmax
Fig.9 Vcc 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 Shutdown Feedback Voltage
0.85
0.9
0.95
1
1.05
1.1
1.15
-25
0
25
50
75
100 125 150
Vsd
Fig.11 Shutdown 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)
KA1L0880B/KA1M0880B
7
Typical Performance Characteristics
(Continued)
(These characteristic grahps are normalized at Ta=25
C)
Figure 13. 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
Temperature [
C
]
Temperature [
C
]
(
)
KA1L0880B/KA1M0880B
8
Package Dimensions
TO-3P-5L
KA1L0880B/KA1M0880B
9
Package Dimensions
TO-3P-5L (Forming)
KA1L0880B/KA1M0880B
10/17/01 0.0m 001
Stock#DSxxxxxxxx
2001 Fairchild Semiconductor Corporation
LIFE SUPPORT POLICY
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 system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
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.
Ordering Information
TU : Non Forming Type
YDTU : Forming type
Product Number
Package
Rating
Fosc
KA1L0880B-TU
TO-3P-5L
800V, 8A
50kHz
KA1L0880B-YDTU
TO-3P-5L(Forming)
KA1M0880B-TU
TO-3P-5L
800V, 8A
67kHz
KA1M0880B-YDTU
TO-3P-5L(Forming)
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