STSR3 STMicroelectronics, STSR3 Datasheet
STSR3
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STSR3 Summary of contents
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... OPERATING FREQUENCY 750 KHz SMART TURN-OFF ANTICIPATION TIMING AUTOMATIC TURN OFF FOR DUTY CYCLE LESS THAN 14% POSSIBILITY TO OPERATE IN DISCONTINUOUS MODE DESCRIPTION STSR3 Smart Driver IC provides a high current outputs to properly drive secondary Power Mosfets used as Synchronous Rectifier in low output voltage, high efficiency Converters ...
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... TYPE STSR3 CONNECTION DIAGRAM (top view) 2/12 Parameter =105°C without heatsink A Pins 1, Pin 3 Parameter SO-8 STSR3CD Value Unit - 270 0.9 KV -55 to +150 °C -40 to +125 °C SO-8 Unit 40 °C/W 160 °C/W SO-8 (T&R) STSR3CD-TR ...
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... GATE level. Reference for power signals, this pin carries the full peak currents for the two outputs turning off the OUT ANT >V the OUT will be high for a INHIBIT H GATE ). In typical flyback converter application turning off ANT STSR3 It is GATE 3/12 ...
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... STSR3 ELECTRICAL CHARACTERISTICS (V to 125°C, unless otherwise specified.) Symbol Parameter SUPPLY INPUT AND UNDER VOLTAGE LOCK OUT V Start Threshold CCON V Turn OFF Threshold After CCOFF Start V Zener Voltage Z I Unloaded Supply Current CC GATE DRIVER OUTPUTS V Output Low Voltage OL V Output High Voltage ...
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... TIMING DIAGRAM APPLICATION INFORMATION: STSR3 IN FLYBACK CONVERTER SECONDARY SIDE Vin PWM NOTES 1) Ceramic Capacitors C1 and C2 must be placed very close to the IC and R2 set the anticipation time by partitioning the and resistor divider meant to provide the correct CK voltage range limits the current flowing through diode D2 when Freewheeling drain voltage is high; ...
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... STSR3 EXAMPLE OF COMPONENTS SELECTION FOR A FLYBACK CONVERTER Flyback Specification: V =36-72V IN V =3.3V OUT n=Np/Ns=4.5 R and R are calculated assuring a minimum voltage of 2. pin. At 36V input, the voltage on the 3 4 secondary winding is 36/4.5=8V. Choosing --------------------------------------------------------------- - – 2.8 R =1k is chosen. At 72V input the current at Ck pin is calculated as: ...
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... INHIBIT OPERATION OF OUT INHIBIT OPERATION OF OUT IN DISCONTINUOUS CONDUCTION MODE GATE GATE STSR3 7/12 ...
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... STSR3 TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified T Figure 1 : Zener Characteristics Figure 2 : Rise and Fall Time vs Load Capacitor Figure 3 : OUT vs Characteristics GATE 8/12 = 25°C j Figure 4 : Sink-Source ON Resistance vs Temperature Figure 5 : Clock Threshold Voltage vs Temperature Figure 6 : INHIBIT Threshold Voltage vs Temperature ...
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... Figure 7 : Supply Current vs Load Capacitor Figure 8 : Supply Current vs Clock Frequency Figure 9 : GATE ON Time vs Temperature Figure 10 : Duty Cycle Shut Down vs Temperature Figure 11 : Duty Cycle Turn ON After Shut Down vs Temperature Figure 12 : Clock Leakage Current vs Clock Voltage STSR3 9/12 ...
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... STSR3 DIM. MIN. A 1.35 A1 0.10 A2 1.10 B 0.33 C 0.19 D 4. 5.80 h 0.25 L 0.40 k ddd 10/12 SO-8 MECHANICAL DATA mm. TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 1.27 6.20 0.50 1.27 ˚ (max.) 8 0.1 inch MIN. TYP. MAX. 0.053 0.069 0.04 0.010 0.043 0.065 0.013 0.020 0.007 0.010 0.189 0.197 0.150 0.157 0.050 0.228 0.244 0.010 0.020 0.016 0.050 0016023/C ...
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... Tape & Reel SO-8 MECHANICAL DATA mm. DIM. MIN 12 8.1 Bo 5.5 Ko 2.1 Po 3.9 P 7.9 TYP MAX. MIN. 330 13.2 0.504 0.795 2.362 22.4 8.5 0.319 5.9 0.216 2.3 0.082 4.1 0.153 8.1 0.311 STSR3 inch TYP. MAX. 12.992 0.519 0.882 0.335 0.232 0.090 0.161 0.319 11/12 ...
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... STSR3 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...