www.fairchildsemi.com
KA1M0680B/KA1M0680RB/
KA1H0680B/KA1H0680RFB
Fairchild Power Switch(FPS)
Features
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Precision fixed operating frequency
KA1M0680B,KA1M0680RB (67KHz)
KA1H0680B,KA1H0680RFB (100KHz)
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 (KA1M0680B,KA1H0680B)
Auto restart (KA1M0680RB,KA1H0680RFB)
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
TO-3PF-5L
1
1
1.DRAIN 2.GND 3.V
CC
4.FB 5.Soft Start
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
KA1M0680B/KA1M0680RB/KA1H0680B/KA1H0680RFB
Absolute Maximum Ratings
Parameter
Maximum Drain voltage
(1)
Drain Gate voltage (R
GS
=1MΩ)
Gate source (GND) voltage
Drain current pulsed
Avalanche current
(4)
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
(2)
Symbol
V
D,MAX
V
DGR
V
GS
I
DM
E
AS
I
AS
I
D
I
D
V
CC,MAX
V
FB
P
D
Derating
T
A
T
STG
Value
800
800
±30
24.0
455
16
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
A
DC
A
DC
V
V
W
W/°C
°C
°C
Single pulsed avalanche energy
(3)
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
4. L=13µH, starting Tj=25°C
2
KA1M0680B/KA1M0680RB/KA1H0680B/KA1H0680RFB
Electrical Characteristics (SFET part)
(Ta=25°C unless otherwise specified)
Parameter
Drain source breakdown voltage
Symbol
BV
DSS
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
-
-
-
-
-
-
-
-
-
-
-
nC
nS
pF
Unit
V
µA
µA
Ω
S
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
I
DSS
R
DS(ON)
gfs
Ciss
Coss
Crss
t
d(on)
tr
t
d(off)
tf
Qg
Qgs
Qgd
3
KA1M0680B/KA1M0680RB/KA1H0680B/KA1H0680RFB
Electrical Characteristics (CONTROL part)
(Ta=25°C unless otherwise specified)
Parameter
UVLO SECTION
Start threshold voltage
Stop threshold voltage
OSCILLATOR SECTION
KA1M0680B
Initial accuracy
F
OSC
KA1M0680RB
KA1H0680B
KA1H0680RFB
Frequency change with temperature
(2)
∆F/∆T
−25°C ≤
Ta
≤
+85°C
KA1M0680B
Maximum duty cycle
Dmax
KA1M0680RB
KA1H0680B
KA1H0680RFB
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)
Temperature Stability
(1)(2)
Peak Current Limit
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
0.45
18
35
mA
mA
V
T
SD
V
OVP
-
-
140
23
160
25
-
28
°C
V
Vref
Vref/∆T
I
OVER
Ta=25°C
−25°C ≤
Ta
≤
+85°C
Max. inductor current
4.80
-
3.52
5.00
0.3
4.00
5.20
0.6
4.48
V
mV/°C
A
V
SS
I
SS
V
FB
=2V
Sync & S/S=GND
4.7
0.8
5.0
1.0
5.3
1.2
V
mA
I
FB
V
SD
Idelay
Ta=25°C, 0V
≤
Vfb
≤
3V
-
Ta=25°C, 5V
≤
Vfb
≤
V
SD
0.7
6.9
4.0
0.9
7.5
5.0
1.1
8.1
6.0
mA
V
µA
61
61
90
90
-
74
74
64
64
67
67
100
100
±5
77
77
67
67
73
73
110
110
±10
80
80
70
70
%
%
kHz
V
START
V
STOP
-
After turn on
14
9
15
10
16
11
V
V
Symbol
Condition
Min.
Typ.
Max.
Unit
CURRENT LIMIT (SELF-PROTECTION) SECTION
Note:
1. These parameters, although guaranteed, are not 100% tested in production
2. These parameters, although guaranteed, are tested in EDS (wafer test) process
4
KA1M0680B/KA1M0680RB/KA1H0680B/KA1H0680RFB
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
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
IIop
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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