www.fairchildsemi.com
KA2S0880B
Fairchild Power Switch(SPS)
Features
•
•
•
•
•
•
•
•
•
Wide operating frequency range up to 150KHz
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
External sync terminal
Latch up Mode
Description
The SPS product family is specially designed for an off-line
SMPS with minimal external components. The SPS consist of
high voltage power SenseFET and current mode PWM Control-
ler IC. PWM controller features integrated fixed oscillator,
under voltage lockout, 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 switch-
ing converter solution, a SPS 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 monitor power supply.
TO-3P-5L
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.1.0.1
©2001 Fairchild Semiconductor Corporation
KA2S0880B
Absolute Maximum Ratings
Parameter
Maximum Drain voltage
(1)
Drain-Gate voltage (R
GS
=1MΩ)
Gate-source (GND) voltage
Drain current pulsed
(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
32.0
810
25
8.0
5.6
30
−0.3
to V
SD
190
1.54
−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)
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
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
KA2S0880B
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
=5.0A
V
DS
=15V, I
D
=5.0A
V
GS
=0V, V
DS
=25V,
f=1MHz
V
DD
=0.5BV
DSS
, I
D
=8.0A
(MOSFET switching
time are essentially
independent of
operating temperature)
V
GS
=10V, I
D
=8.0A,
V
DS
=0.5BV
DSS
(MOSFET
switching time are
essentially independent of
operating temperature)
Min.
800
-
-
-
1.5
-
-
-
-
-
-
-
-
-
-
Typ.
-
-
-
1.2
2.5
2460
210
64
-
95
150
60
-
20
70
Max.
-
50
200
1.5
-
-
-
-
90
200
450
150
150
-
-
nC
nS
pF
Unit
V
µA
µA
Ω
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
td(on)
tr
td(off)
tf
Qg
Qgs
Qgd
S
3
KA2S0880B
Electrical Characteristics (CONTROL part)
(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
SYNC. & SOFT START SECTION
Soft start voltage
Soft start current
Sync threshold voltage
(3)
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
0.55
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
-
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
Idelay
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
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
KA2S0880B
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
lIop
1
OP
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
京公网安备 11010802033920号
EEWORLD
