www.fairchildsemi.com
KA1M0965R
Fairchild Power Switch(FPS)
Features
•
•
•
•
•
•
•
•
•
Precision Fixed Operating Frequency (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
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
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
1. DRAIN 2. GND 3. V
CC
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
5V
+
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.1.0.3
©2003 Fairchild Semiconductor Corporation
KA1M0965R
Absolute Maximum Ratings
Parameter
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
DGR
V
GS
I
DM
E
AS
I
D
I
D
V
CC,MAX
V
FB
P
D
Darting
T
A
T
STG
Value
650
±30
36.0
950
9.0
5.8
30
-0.3 to V
SD
170
1.33
-25 to +85
-55 to +150
Unit
V
V
A
DC
mJ
A
DC
A
DC
V
V
W
W/°C
°C
°C
Notes:
1. T
j
= 25°C to 150°C
2. Repetitive rating: Pulse width limited by maximum junction temperature
3. L = 20mH, V
DD
= 50V, R
G
= 27Ω, starting T
j
= 25°C
2
KA1M0965R
Electrical Characteristics (SFET part)
(Ta=25°C unless otherwise specified)
Parameter
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:
1. Pulse test: Pulse width
≤
300µS, duty cycle
≤
2%
1
2. 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
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
=4.5A
V
DS
=15V, I
D
=4.5A
V
GS
=0V, V
DS
=25V,
f=1MHz
V
DD
=0.5BV
DSS
, I
D
=9.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
V
GS
=10V, I
D
=9.0A,
V
DS
=0.5BV
DSS
(MOSFET
switching time are essentially
independent of
operating temperature)
Min. Typ. Max. Unit
650
-
-
-
5.0
-
-
-
-
-
-
-
-
-
-
-
-
-
0.96
-
1750
190
78
20
23
85
30
74
12
35.4
-
50
200
1.2
-
-
-
-
50
55
180
70
75
-
-
nC
nS
pF
V
µA
µA
Ω
S
3
KA1M0965R
Electrical Characteristics (Control Part)
(Continued)
(Ta=25°C unless otherwise specified)
Parameter
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)
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
0.4
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
-
5.28
5.00
0.3
6.00
5.20
0.6
6.72
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
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
Condition
Min.
Typ.
Max.
Unit
CURRENT LIMIT (SELF-PROTECTION) SECTION
Notes:
1. These parameters, although guaranteed, are not 100% tested in production
2. These parameters, although guaranteed, are tested in EDS (wafer test) process
3. The amplitude of the sync. pulse is recommended to be between 2V and 3V for stable sync. function.
4
KA1M0965R
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
IFB
0.95
0.9
0.85
0.8
-25
Fig.2 Feedback Source Current
0
25
50
75
100
125 150
Temperature [°
C
]
Figure 1. Operating Frequency
Temperature [°
C
]
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
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
50
75
100 125 150
Temperature [°
C
]
Figure 5. Start up Current
Temperature [°
C
]
Figure 6. Start Threshold Voltage
5
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