SPW3842D SECOS | Alldatasheet
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Technical content
Features
consisting of input and reference undervoltages lockouts each with The SPW3842D is high performance fixed frequency current mode controllers. This is specifically designed for Off-Line and DC TO DC converter applications offering the designer a cost-effective solution with min. external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature compensated reference, high gain Error amplifier, current sensing comparator, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features hysteresis, cycle-by-cycle current limiting, proprammable output deadtime, and latch for single pulse metering.
Description
01-Jun-2002 Rev. A Page 1 of 10 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual R o H S C o m p l i a n t P r o d u c t L A SEATING PLANE eb ZZ E D c SECTION Z - Z b GAUGE PLANE DIP-8 A - 0.5334 c1 0.203 0.279 A1 0.381 - D 9.017 10.16 A2 2.921 4.953 E 6.096 7.112 b 0.356 0.559 E1 7.620 8.255 b1 0.356 0.508 e 2.540 BSC b2 1.143 1.778 HE - 10.92 b3 0.762 1.143 L 2.921 3.810 c 0.203 0.356 DIP-8L Function Description Pin1:Compensation This pin is the Error Amplifier output and is made available for loop compensation. Pin2:Voltage Feedback This is the inverting input of the Error Amplifier. It’s normally connected to the Switching power supply output through a resistor divider. Pin3:Current Sense A voltage proportional to inductor current is connected to this input .The PWM uses this information to terminate the output switch conduction. Pin4:RT/CT The oscillator frequency and maximum output duty cycle are programmed by rogrammed by connecting resistor RT to Vref and capacitor CT to ground. Operation 500kHz pacitor CT to ground .Operation 500kHz is possible. Pin5:Ground This pin is the combined control circuitry and power ground. Pin6:Output This output directly drives the gate of a power MOSFET. Peak currents up to nts up to 1 A are sourced and sunk by this pin. Pin7:Vcc This pin is the positive supply of the control IC. Pin8:Vref This is the reference output .It provides charging current for capacitor CT through resistor RT. This is the reference output. It provides charging current for capacitor CT
http://www.SeCoSGmbH.com/ Elektronische Bauelemente Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 2 of 10 Absolute Maximum Ratings at Ta = 25:: :: Parameter Symbol VALUE Unit Total power Supply and Zener current (ICC+Iz) 30 mA Output current,source or sink(note1) Io 1.0 A Output energy(capacitive load per cycle) W 5.0 J Current sense and voltage feedback inputs Vin -0.3 to 5.5 V Error Amplifier Output Sink Current Io 10 mA Power Dissipation at Thermal characteristics PD PJA 702 178 mW :/W Storage Temperature Range Tstg -65 to 150 : Operating Junction Temperature TJ +150 : Operating ambient Temperature TA 0~+70 : Parameter SYMBOL Test Conditions Min Typ. Max. Unit Reference Section Output Voltage VREF Tj=25:,Io=1mA 4.90 5 5.1 V Line Regulation Regline Vcc=12V to 25V 2.0 20 mV Load Regulation Regload Io=1mA to 20mA 3.0 25 mV Temperature. Stability Ts 0.2 - mV/: Total Output Variation VREF Line, Load, Temperature 4.82 - 5.18 V Output Noise Voltage Vn F=10kHz to 10Hz,Tj=25: - 50 - V Long Term Stability S TA=125:,1000Hrs - 5 - mV Output Short Circuit current ISC -30 -85 -180 mA Oscillator Section Tj=25: 49 52 55 TA=0: to 70: 48 56 Frequency Tj=25:(RT=6.2k,CT=1.0nF) 225 250 275 KHz Frequency Change with Voltage fosc/V Vcc=12V to 25V 0.2 1.0 % Frequency Change with Temperature fosc/T TA = 0: to 70 : 0.5 % Oscillator Voltage Swing(Peak to Peak) VOSC 1.6 V Discharge Current Idischg Tj=25: TA = 0: to 70: 7.8 7.6 8.3 8.8 8.8 mA Error Amplifier Section Voltage Feedback Input VFB Vo =2.5V 2.42 2.50 2.58 V Input Bias Current IIB VFB=5.0V -0.1 -2.0 A Open Loop Voltage Gain AVOL Vo=2V to 4V 65 90 dB Unity Gain Bandwidth BW Tj=25: 0.7 1.0 MHz Power Supply Rejection Ratio PSRR Vcc=12V to 25V 60 70 dB Output Sink Current Isink Vo=1.1V,VFB=2.7V 2.0 12 mA Output Source Current Isource Vo=5.0V,VFB=2.3V -0.5 -1.0 mA Output Voltage Swing High State VoH VFB=2.3V,RL=15K to GND 5.0 6.2 V Output Voltage Swing Low State VOL VFB=2.7V,RL=15K to Vref 0.8 1.1 V SPW3842D High Performance Current Mode Controlers
01-Jun-2002 Rev. A Page 3 of 10 ht tp://www.SeCoSGmbH.com/ A ny changing of specification will not be informed individual Elektronische Bauelemente Current Sense section Current Sense Input Voltage gain Av (Note 3,4) 2.85 3.0 3.15 V/V Maximum Current Sense Input Threshold Vth (Note 3) 0.9 1.0 1.1 V Power Supply Rejection Ratio PSRR VCC= 12 to 25V (Note 3) 70 dB Input Bias Current IIB -2 -10 A Propagation Delay Tplh(in/out) Current Sense Input to Output 150 300 ns Isink=20mA 0.1 0.4 V Output Low Voltage VOL Isink=200mA 1.6 2.2 V Isource=20mA 13 13.5 V Output High Level VOH Isource=200mA 12 13.4 V VCC=6.0V,Isink=1.0mA 0.1 1.1 V Output Voltage with UVLO Activated VOL (UVLO) Output Voltage Rise Time tr Tj=25:,CL=1nF 50 150 ns Output Voltage Fall Time tr Tj=25:,CL=1nF 50 150 ns AV V Output Compensation V Current Sense Input Under-Voltage Lockout Section Startup Threshold Vth 14.5 16 17.5 V Min. Operating Voltage After Turn-on(VCC) VCC(min) 8.5 10 11.5 V PWM Section Maximum Duty Cycle DC(MAX) 94 96 % Minimum Duty Cycle DC(MIN) 0 % Total Device Power Startup Supply Current ICC+IC VCC=14V 0.3 0.5 mA Power Operating Supply Current ICC+IC Note 2 12 17 mA Power Supply Zener Voltage Vz ICC=25mA 30 36 V Note 1: Maximum Package power dissipation limits must be observed. Note 2: Adject Vcc above the Startup threshold before setting to 15V. Note 3: This parameter is measured at the latch trip point with VFB=0V. Note 4: Comparator gain is defined as:: Characteristics Curve SPW3842D High Performance Current Mode Controlers
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Application Information
High Performance Current Mode Controlers
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 7 of 10 Elektronische Bauelemente SPW3842D High Performance Current Mode Controlers
http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual 01-Jun-2002 Rev. A Page 8 of 10 Elektronische Bauelemente SPW3842D High Performance Current Mode Controlers
01-Jun-2002 Rev. A Page 9 of 10 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual SPW3842D High Performance Current Mode Controlers
01-Jun-2002 Rev. A Page 10 of 10 http://www.SeCoSGmbH.com/ Any changing of specification will not be informed individual Elektronische Bauelemente SPW3842D High Performance Current Mode Controlers