Fairchild Semiconductor KA3S0765RF-YDTU, KA3S0765RF-TU, KA3S0765R-YDTU, KA3S0765R-TU Datasheet
KA3S0765R/KA3S0765RF
Fairchild Power Switch(SPS)
www.fairchildsemi.com
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 I C features a trimmed oscillator, under
voltage lock-out, leading edge blanking, optimized gate turnon/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 component 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
1
TO-3PF-5L
1
Internal Block Diagram
#3 V
CC
32V
#5 Sync
5V
#4 FB
©2001 Fairchild Semiconductor Corporation
µ
2
7.5V
25V
A
−
+
6.4V
2.5R
1mA
1R
9V
+
−
+
−
Thermal S/D
OVER VOLTAGE S/D
−
+
5V
Vref
OSC
L.E.B
0.1V
Good
logic
S
R
1. DRAIN 2. GND 3. Vcc 4. FB 5. Sync
Internal
bias
Q
S
R
Power on reset
Q
SFET
#1 DRAIN
#2 GND
Rev.1.0.1
KA3S0765R/KA3S0765RF
Absolute Maximum Ratings
Characteristic Symbol Value Unit
GS
(2)
(1)
=1MΩ)
C
=25°C)
Maximum drain voltage
Drain-gate voltage (R
Gate-source (GND) Voltage
Drain current pulsed
Avalanche current
Continuous drain current (T
Continuous drain current (TC=100°C)
Maximum supply voltage
Input voltage range
Total power dissipation
Operating ambient temperature
Storage temperature
V
D,MAX
V
DGR
V
I
DM
I
V
CC,MAX
V
(watt H/S)
P
D
Derating
T
T
STG
GS
AS
I
D
I
D
FB
650 V
650 V
±30 V
28.0 A
DC
20 A
7.0 A
5.6 A
DC
DC
30 V
−0.3 to V
SD
V
140 W
1.11 W/°C
A
−25 to +85 °C
−55 to +150 °C
Notes:
1. Tj=25°C to 150°C
2. Repetiti ve rating: Pulse width limi ted by maximum junction temp erature
3. L=24mH, V
=50V, RG=25Ω, starting Tj=25 °C
DD
2
Electrical Characteristics (SFET part)
(Ta = 25°C unless otherwise specified)
Characteristic Symbol Test condition Min. Typ. Max. Unit
Drain-source breakdown voltage BV
Zero gate voltage drain current I
Static drain-source on resistance
Forward transconductance
(note)
(note)
DSS
DSS
R
DS(ON)VGS
gfs VDS=15V, ID=4.0A
Input capacitance Ciss
Output capacitance Coss
Reverse transfer capacitance Crss
Turn on delay time t
d(on)
Rise time tr
Turn off delay time t
d(off)
Fall time tf
Total gate charge
(gate-source+gate-drain)
Qg
Gate-source charge Qgs
Gate-drain (Miller) charge Qgd
VGS=0V, ID=50µA
VDS=Max., Rating,
V
V
V
V
f=1MHz
VDD=0.5BV
(MOSFET switching
time are essentially
independent of
operating temperature)
V
V
switching time are
essentially independent of
operating temperature)
=0V
GS
=0.8Max., Rating,
DS
=0V, TC=125°C
GS
=10V, ID=4.0A
=0V, VDS=25V,
GS
DSS
=10V, ID=7.0A,
GS
=0.5BV
DS
DSS
, ID=7.0A
(MOSFET
KA3S0765R/KA3S0765RF
650 - - V
--50µA
- - 200 mA
- 1.25 1.6 W
3.0 - - S
- 1600 - pF
- 310 -
- 120 -
-25-nS
-55-
-80-
-50-
- - 72 nC
-9.3-
- 29.3 -
Note:
Pulse test: Pulse width <
1
S
--- -=
R
300µS, duty cycle < 2%
3
KA3S0765R/KA3S0765RF
Electrical Charcteristics (CONTROL part)
(Ta = 25°C unless otherwise specified)
Characteristic Symbol Test condition Min. Typ. Max. Unit
UVLO SECTION
Start threshold voltage V
Stop threshold voltage V
START
STOP
After turn on 9 10 11 V
OSCILLATOR SECTION
Initial accuracy F
Frequency change with temperature
(2)
OSC
∆F/∆T −25°C≤Ta≤+85°C-±5 ±10 %
Ta=25°C182022kHz
Maximum duty cycle Dmax - 92 95 98 %
FEEDBACK SECTION
Feedback source current I
Shutdown Feedback voltage V
Shutdown delay current I
FB
SD
delay
Ta=25°C, Vfb=GND 0.7 0.9 1.1 mA
Ta=25°C, 5V≤Vfb≤V
SYNC. & SOFT START SECTION
Soft start voltage V
Soft start current I
Sync threshold voltage
(3)
V
SS
SS
SYTH
VFB=2V 4.7 5.0 5.3 V
Sync & S/S=GND 0.8 1.0 1.2 mA
Vfb=5V 6.0 6.4 6.8 V
REFERENCE SECTION
Output voltage
Temperature Stability
(1)
(1)(2)
V
ref
V
ref/
Ta=25°C 4.80 5.00 5.20 V
∆T −25°C≤Ta≤+85°C-0.30.6mV/°C
CURRENT LIMIT (SELF-PROTECTION) SECTION
Peak Current Limit I
OVER
Max. inductor current 4.40 5.00 5.60 A
PROTECTION SECTION
Thermal shutdown temperature (Tj)
(1)
Over voltage protection voltage V
T
SD
OVP
TOTAL DEVICE SECTION
Start Up current I
Operating supply current
(control part only)
V
zener voltage V
CC
START
I
OP
Z
VCC=14V 0.1 0.3 0.55 mA
Ta=25°C 6 12 18 mA
ICC=20mA 30 32.5 35 V
-141516V
-6.97.58.1V
SD
1.4 1.8 2.2 µA
- 140 160 - °C
-232528V
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
Typical Performance Characteristics
(These characteristic graphs are normalized at Ta = 25°C)
KA3S0765R/KA3S0765RF
Fig.2 Feedback Sourc e Current
1.2
1.1
1
0.9
0.8
-25 0 25 50 75 100 125 150
Fosc
Fig.1 O per at ing Fr eque nc y
1.2
1.15
1.1
1.05
1
0.95
0.9
0.85
0.8
-25 0 25 50 75 100 125 150
Ifb
IFB
1.15
1.05
0.95
0.85
Temperature [°C] Temperature [°C]
Figure 1. Operating Frequency Figure 2. Feedback Source Current
1.2
1.15
1.1
1.05
Iop
1
0.95
0.9
0.85
0.8
-25 0 25 50 75 100 125 150
Temperature [
Fig.3 Operating Cur rent
1.1
1.05
I
over
Ipeak
0.95
0.9
0.85
0.8
] Temperature [
C
°
Fig.4 Max Inductor Current
1
-25 0 25 50 75 100 125 150
]
C
°
Figure 3. Operating Supply Current Figure 4. Peak Current Limit
I
ST
Istart
1.5
1.3
1.1
0.9
0.7
0.5
Fig.5 Start up Current
-25 0 25 50 75 100 125 150
V
th(H)
Vstart
Fig.6 Star t Threshold Voltage
1.15
1.1
1.05
1
0.95
0.9
0.85
-25 0 25 50 75 100 125 150
Temperature [°
Figure 5. Start up Current Figure 6. Start Threshold Voltage
]Temperature [°C]
C
5
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