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KA3S0765R/KA3S0765RF
Fairchild Power Switch(SPS)
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 SPS product family is specially designed for an offline
SMPS with minimal external components. The SPS 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 volt-
age protection, temperature compensated precision current
sources for loop compensation and fault protection circuit.
Compared to discrete MOSFET and controller or RCC
switching converter solution, a SPS can reduce total compo-
nent count, design size, weight and at the same time increase
& efficiency, productivity, and system reliabilit. It has a
basic platform well suited for cost-effective C-TV power
supply.
TO-3P-5L
TO-3PF-5L
1
1
1. DRAIN 2. GND 3. Vcc 4. FB 5. Sync
Internal Block Diagram
#3 V
CC
32V
5V
Vref
−
5V
+
6.4V
#4 FB
2µA
1mA 2.5R
1R
9V
+
7.5V
−
+
25V
−
Thermal S/D
OVER VOLTAGE S/D
−
+
0.1V
S
R
Q
#2 GND
OSC
S
R
L.E.B
Q
Good
logic
Internal
bias
#1 DRAIN
SFET
#5 Sync
Power on reset
Rev.1.0.1
©2001 Fairchild Semiconductor Corporation
KA3S0765R/KA3S0765RF
Absolute Maximum Ratings
Characteristic
Maximum drain voltage
(1)
Drain-gate voltage (R
GS
=1MΩ)
Gate-source (GND) Voltage
Drain current pulsed
(2)
Avalanche current
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
I
AS
I
D
I
D
V
CC
,
MAX
V
FB
P
D
(watt H/S)
Derating
T
A
T
STG
Value
650
650
±30
28.0
20
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
A
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
KA3S0765R/KA3S0765RF
Electrical Characteristics (SFET part)
(Ta = 25°C
unless otherwise specified)
Characteristic
Drain-source breakdown voltage
Symbol
BV
DSS
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
-
-
nC
nS
Unit
V
µA
mA
W
S
pF
Zero gate voltage drain current
I
DSS
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
R
DS(ON)
gfs
Ciss
Coss
Crss
t
d(on)
tr
t
d(off)
tf
Qg
Qgs
Qgd
Note:
Pulse test: Pulse width < 300µS, duty cycle < 2%
1
S
= ---
-
R
3
KA3S0765R/KA3S0765RF
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
SYNC. & SOFT START SECTION
Soft start voltage
Soft start current
Sync threshold voltage
(3)
REFERENCE SECTION
Output voltage
(1)
V
ref
Ta=25°C
V
ref/
∆T
Temperature Stability
(1)(2)
−25°C≤Ta≤+85°C
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
0.55
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
V
SS
I
SS
V
SYTH
V
FB
=2V
Sync & S/S=GND
Vfb=5V
4.7
0.8
6.0
5.0
1.0
6.4
5.3
1.2
6.8
V
mA
V
I
FB
V
SD
I
delay
Ta=25°C, Vfb=GND
-
Ta=25°C, 5V≤Vfb≤V
SD
0.7
6.9
1.4
0.9
7.5
1.8
1.1
8.1
2.2
mA
V
µA
F
OSC
∆F/∆T
Dmax
Ta=25°C
−25°C≤Ta≤+85°C
-
18
-
92
20
±5
95
22
±10
98
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
KA3S0765R/KA3S0765RF
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
Iop
1
0.95
0.9
0.85
0.8
-25
1.1
1.05
Fig.4 Max Inductor Current
IIpeak
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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