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KA3S0680RB/KA3S0680RFB
Fairchild Power Switch(FPS)
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 external
components. The Fairchild Power Switch(FPS) consist of
high voltage power SenseFET and current mode PWM
controller IC. controller 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
TO-3PF-5L
1
1
1.DRAIN 2.GND 3.V
CC
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
−
+
OSC
S
R
L.E.B
0.1V
S
R
Q
#2 GND
Q
Good
logic
Internal
bias
#1 DRAIN
SFET
#5 Sync
Power on reset
Rev.1.0.2
©2001 Fairchild Semiconductor Corporation
KA3S0680RB/KA3S0680RFB
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
(watt H/S)
Derating
T
A
T
STG
Value
800
800
±30
24.0
455
6.0
4.0
30
−0.3
to V
SD
150
1.21
−25
to +85
−55
to +150
Unit
V
V
V
A
DC
mJ
A
DC
A
DC
V
V
W
W/°C
°C
°C
Note:
1. Tj=25°C to 150°C
2. Repetitive rating: Pulse width limited by maximum junction temperature
3. L=24mH, starting Tj=25
°C
2
KA3S0680RB/KA3S0680RFB
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 cycle
≤
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
= 6.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
V
GS
=10V, I
D
= 6.0A,
V
DS
= 0.5BV
DSS
(MOSFET
switching time are
essentially independent of
operating temperature)
Min.
800
-
-
-
1.5
-
-
-
-
-
-
-
-
-
-
Typ.
-
-
-
1.6
2.5
1600
140
42
60
150
300
130
70
16
27
Max.
-
50
200
2.0
-
-
-
-
-
-
-
-
-
-
-
Unit
V
µA
mA
W
S
pF
nS
nC
3
KA3S0680RB/KA3S0680RFB
Electrical Charcteristics (SFET part) (Continued)
(Ta = 25°C unless otherwise specified)
Characteristic
Symbol
UVLO SECTION
Start threshold voltage
V
START
Stop operating voltage
V
STOP
OSCILLATOR SECTION
Initial accuracy
F
OSC
Frequency change with temperature
(2)
∆F/∆T
Maximum duty cycle
D
MAX
FEEDBACK SECTION
Feedback source current
I
FB
Shutdown Feedback voltage
V
SD
Shutdown delay current
I
delay
SYNC. & SOFT START SECTION
Soft start voltage
V
SS
Soft start current
I
SS
(3)
V
SYTH
Sync threshold voltage
REFERENCE SECTION
Vref
Output voltage
(1)
(1)(2)
Vref/∆T
Temperature Stability
CURRENT LIMIT (SELF-PROTECTION) SECTION
Peak Current Limit
I
OVER
PROTECTION SECTION
T
SD
Thermal shutdown temperature (Tj)
(1)
Over voltage protection voltage
V
OVP
TOTAL DEVICE SECTION
Start Up current
I
START
Operating supply current
I
OP
(control part only)
V
CC
zener voltage
V
Z
Test condition
-
After turn on
Ta = 25°C
−25°C ≤
Ta
≤
+85°C
-
Ta = 25°C, Vfb = GND
-
Ta = 25°C, 5V
≤
Vfb
≤V
SD
V
FB
= 2V
Sync & S/S = GND
Vfb = 5V
Ta = 25°C
−25°C ≤
Ta
≤
+85°C
Max. inductor current
-
-
V
CC
= 14V
Ta = 25°C
I
CC
= 20mA
Min.
14
9
18
-
92
0.7
6.9
1.4
4.7
0.8
6.0
4.80
-
3.52
140
23
0.1
6
30
Typ.
15
10
20
±5
95
0.9
7.5
1.8
5.0
1.0
6.4
5.00
0.3
4.00
160
25
0.3
12
32.5
Max.
16
11
22
±10
98
1.1
8.1
2.2
5.3
1.2
6.8
Unit
V
V
kHz
%
%
mA
V
µA
V
mA
V
5.20
V
0.6 mV/°C
4.48
-
28
0.55
18
35
A
°C
V
mA
mA
V
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
KA3S0680RB/KA3S0680RFB
Typical Performance Characteristics (control part)
(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
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
Ipeak
1
I
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
Istart
1.1
0.9
0.7
0.5
-25
Vstart
1
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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