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KA2S0680B
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) www.DataSheet4U.com • 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 Controller 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 voltage 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 reliability. It has a basic platform well suited for cost effective design in monitor power supply.
TO-3P-5L
1. DRAIN 2. GND 3. VCC 4. FB 5. Sync
Internal Block Diagram
#3 VCC 32V 5V Vref − 5V + 6.4V #4 FB − 1mA 2.5R 1R 9V + 7.5V − + 25V − Thermal S/D OVER VOLTAGE S/D + OSC S R 2µA 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
KA2S0680B
Absolute Maximum Ratings
Parameter Maximum Drain voltage
(1)
Symbol VD,MAX VDGR VGS IDM
(3)
Value 800 800 ±30 24.0 455 20 6.0 4.0 30 −0.3 to VSD 150 1.21 −25 to +85 −55 to +150
Unit V V V ADC mJ A ADC ADC V V W W/°C °C °C
Drain-Gate voltage (RGS=1MΩ) Gate-source (GND) voltage Drain current pulsed Avalanche current(4)
(2)
Single pulsed avalanche energy
EAS IAS ID ID VCC,MAX VFB PD Derating TA TSTG
Continuous drain current (TC=25°C) Continuous drain current (TC=100°C)
www.DataSheet4U.com 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, VDD=50V, RG=25Ω, starting Tj=25°C 4. L=13µH, starting Tj=25°C
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KA2S0680B
Electrical Characteristics (SFET part)
(Ta=25°C unless otherwise specified) Parameter Drain-source breakdown voltage Symbol BVDSS Condition VGS=0V, ID=50µA VDS=Max., Rating, VGS=0V VDS=0.8Max., Rating, VGS=0V, TC=125°C VGS=10V, ID=4.0A VDS=15V, ID=4.0A VGS=0V, VDS=25V, f=1MHz VDD=0.5BVDSS, ID=6.0A (MOSFET switching time are essentially independent of operating temperature) VGS=10V, ID=6.0A, VDS=0.5BVDSS (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 Input capacitance www.DataSheet4U.com 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
(note)
IDSS
RDS(ON) gfs Ciss Coss Crss td(on) tr td(off) tf Qg Qgs Qgd
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KA2S0680B
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 Maximum duty cycle
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(2)
Symbol VSTART VSTOP FOSC ∆F/∆T Dmax IFB VSD Idelay VSS ISS
Condition After turn on Ta=25°C −25°C≤Ta≤+85°C Ta=25°C, Vfb=GND Ta=25°C, 5V≤Vfb≤VSD VFB=2V Sync & S/S=GND Vfb=5V Ta=25°C −25°C≤Ta≤+85°C Max. inductor current VCC=14V Ta=25°C ICC=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 5.20 0.6 4.48 28 0.55 18 35
Unit V V kHz % % mA V µA V mA V V mV/°C A °C V mA mA V
FEEDBACK SECTION Feedback source current
Shutdown Feedback voltage Shutdown delay current SYNC. & SOFT START SECTION Soft start voltage Soft start current Sync threshold voltage Output voltage (1) Temperature Stability 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) VCC zener voltage
(1)(2) (3)
VSYTH Vref Vref/∆T IOVER TSD VOVP ISTART IOP VZ
REFERENCE SECTION
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.
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KA2S0.