www.fairchildsemi.com
KA1M0765R/KA1M0765RC
Fairchild Power Switch(FPS)
Features
•
•
•
•
•
•
•
•
•
Precision fixed operating frequency (67kHz)
Pulse by pulse current limiting
Over load protection
Over voltage protecton (Min. 23V)
Internal thermal shutdown function
Under voltage lockout
Internal high voltage sense FET
Auto restart
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
frequency oscillator, under voltage lock out, leading edge
blanking, optimized gate turn-on/turn-off driver, thermal
shutdown protection, over voltage protection, temperature
compensated precision current sources for loop
compensation and fault protection circuit. compared to
discrete MOSFET and PWM controller or R
CC
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
TO-220-5L
1
1
1. DRAIN 2. GND 3. Vcc 4. FB 5. S/S
Internal Block Diagram
#3 V
CC
32V
5V
Vref
Good
logic
#5 Soft Start
5V
OSC
S
R
#4 FB
5µA
1mA 2.5R
1R
9V
+
7.5V
−
+
25V
−
Thermal S/D
OVER VOLTAGE S/D
−
+
L.E.B
0.1V
S
R
Q
#2 GND
Q
Internal
bias
#1 DRAIN
SFET
Power on reset
Rev.1.0.2
©2001 Fairchild Semiconductor Corporation
KA1M0765R/KA1M0765RC
Absolute Maximum Ratings
Characteristic
Maximum Drain voltage
(1)
Drain-Gate voltage (R
GS
=1MΩ)
Gate-source (GND) voltage
Drain current pulsed
(2)
Single pulsed avalanche energy
(3)
Continuous drain current (T
C
=25°C)
Continuous drain current (T
C
=100°C)
Maximum Supply voltage
Input voltage range
Total power dissipation
Operating ambient temperature
Storage temperature
Symbol
V
D,MAX
V
DGR
V
GS
I
DM
E
AS
I
D
I
D
V
CC,MAX
V
FB
P
D
Derating
T
A
T
STG
Value
650
650
±30
28.0
570
7.0
5.6
30
−0.3
to V
SD
140
1.11
−25
to +85
−55
to +150
Unit
V
V
V
A
DC
mJ
A
DC
A
DC
V
V
W
W/°C
°C
°C
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
=25Ω, starting Tj=25°C
2
KA1M0765R/KA1M0765RC
Electrical Characteristics (SFET part)
(Ta = 25°C unless otherwise specified)
Characteristic
Drain-source breakdown voltage
Zero gate voltage drain current
Static drain-source on resistance
(note)
Forward transconductance
(note)
Input capacitance
Output capacitance
Reverse transfer capacitance
Turn on delay time
Rise time
Turn off delay time
Fall time
Total gate charge
(gate-source+gate-drain)
Gate source charge
Gate drain (Miller) charge
Note:
Pulse test: Pulse width < 300µS, duty < 2%
1
S
= ---
-
R
Symbol
BV
DSS
I
DSS
R
DS(ON)
gfs
Ciss
Coss
Crss
t
d(on)
tr
t
d(off)
tf
Qg
Qgs
Qgd
Test condition
V
GS
=0V, I
D
=50µA
V
DS
=Max., Rating,
V
GS
=0V
V
DS
=0.8Max., Rating,
V
GS
=0V, T
C
=125°C
V
GS
=10V, I
D
=4.0A
V
DS
=15V, I
D
=4.0A
V
GS
=0V, V
DS
=25V,
f=1MHz
V
DD
=0.5BV
DSS
, I
D
=7.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
V
GS
=10V, I
D
=7.0A,
V
DS
=0.5BV
DSS
(MOSFET
switching time are
essentially independent of
operating temperature)
Min.
650
-
-
-
3.0
-
-
-
-
-
-
-
-
-
-
Typ.
-
-
-
1.25
-
1600
310
120
25
55
80
50
-
9.3
29.3
Max.
-
50
200
1.6
-
-
-
-
-
-
-
-
72
-
-
Unit
V
µA
mA
W
S
pF
nS
nC
3
KA1M0765R/KA1M0765RC
Electrical Charcteristics (CONTROL part)
(Ta = 25°C unless otherwise specified)
Characteristic
UVLO SECTION
Start threshold voltage
Stop threshold voltage
OSCILLATOR SECTION
Initial accuracy
Frequency change with temperature
(2)
Maximum duty cycle
FEEDBACK SECTION
Feedback source current
Shutdown Feedback voltage
Shutdown delay current
SOFT START SECTION
Soft Start Voltage
Soft Start Current
REFERENCE SECTION
Output voltage
(1)
Vref
Ta = 25°C
(1)(2)
Vref/∆T
−25°C ≤
Ta
≤
+85°C
Temperature Stability
CURRENT LIMIT (SELF-PROTECTION) SECTION
Max. inductor current
Peak Current Limit
I
OVER
PROTECTION SECTION
Thermal shutdown temperature (Tj)
(1)
Over voltage protection voltage
TOTAL DEVICE SECTION
Start Up current
Operating supply current
(control part only)
V
CC
zener voltage
I
START
I
OP
V
Z
V
CC
=14V
Ta=25°C
I
CC
=20mA
0.1
6
30
0.3
12
32.5
0.4
18
35
mA
mA
V
T
SD
V
OVP
-
-
140
23
160
25
-
28
°C
V
4.80
-
4.40
5.00
0.3
5.00
5.20
0.6
5.60
V
mV/°C
A
I
FB
V
SD
Idelay
V
SS
I
SS
Ta=25°C, 0V
≤Vfb ≤
3V
-
Ta=25°C, 5V
≤
Vfb
≤
V
SD
V
FB
=2V
Sync & S/S=GND
0.7
6.9
4.0
4.7
0.8
0.9
7.5
5.0
5.0
1.0
1.1
8.1
6.0
5.3
1.2
mA
V
µA
V
mA
F
OSC
∆F/∆T
Dmax
Ta=25°C
−25°C ≤
Ta
≤
+85°C
-
61
-
74
67
±5
77
73
±10
80
kHz
%
%
V
START
V
STOP
-
After turn on
14
9
15
10
16
11
V
V
Symbol
Test condition
Min.
Typ.
Max.
Unit
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.
4
KA1M0765R/KA1M0765RC
Typical Performance Characteristics
(These characteristic graphs are normalized at Ta = 25°C)
Fig.1 Operating Frequency
1.2
1.15
1.1
1.05
Fosc
1
0.95
0.9
0.85
0.8
-25
0
25
50
75
100 125 150
1.2
1.15
1.1
1.05
Ifb
IFB
1
0.95
0.9
0.85
0.8
-25
Fig.2 Feedback Source Current
0
25
50
75
100
125 150
Temperature [°
C
]
Temperature [°
C
]
Figure 1. Operating Frequency
Figure 2. Feedback Source Current
Fig.3 Operating Current
1.2
1.15
1.1
1.05
l
Iop
1
OP
0.95
0.9
0.85
0.8
-25
1.1
1.05
Fig.4 Max Inductor Current
I
Ipeak
1
over
0.95
0.9
0.85
0
25
50
75
100 125 150
0.8
-25
0
25
100 125 150
Temperature [°
C
]
50
75
Temperature [°
C
]
Figure 3. Operating Supply Current
Figure 4. Peak Current Limit
1.5
1.3
Fig.5 Start up Current
1.15
1.1
1.05
Fig.6 Start Threshold Voltage
I
ST
Istart
1.1
0.9
0.7
0.5
-25
V
th(H)
1
Vstart
0.95
0.9
0
25
50
75
100 125 150
0.85
-25
0
25
100 125 150
Temperature [°
C
]
50
75
Temperature [°
C
]
Figure 5. Start up Current
Figure 6. Start Threshold Voltage
5
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