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| HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 1/10 H3842S HIGH PERFORMANCE CURRENT MODE CONTROLERS Description The H3842S is high performance fixed frequency current mode controllers. That is specifically designed for OffLine and DC To DC converter applications offering the designer a costeffective solution with minimal external components. These integrated circuits feature a trimmed oscillator for precise duty cycle control. A temperature compensated reference, high gain error amplifier, current sensing compara-tor, and a high current totem pole output ideally suited for driving a power MOSFET. Also included are protective features consisting of input and reference undervoltage lockouts each with hysteresis, cycle-by-cycle current limiting, programmable output deadtime, and a latch for single pulse metering. Features * Trimmed Oscillator for Precise Frequency Control * Oscillator Frequency Guaranteed at 250 kHz * Current Mode Operation to 500 kHz * Automatic Feed Forward Compensation * Latching PWM for Cycle-By-Cycle Current Limiting * Internally Trimmed Reference with Undervoltage Lockout * High Current Totem Pole Output * Undervoltage Lockout with Hysteresis * Low Startup and Operating Current Absolute Maximum Ratings Symbol Vi Vi Io Eo Parameter Supply Voltage (low impedance source) Supply Voltage (Ii<30mA) Output Current Output Energy (capacitive load) Analog Inputs (pin 2, 3) Error Amplifier Output Sink Current Power Dissipation at Tamb25oC Storage Temperature Range Junction Operating Temperature Lead Temperature (soldering 10s) Value 30 Self Limiting 1 5 -0.3 to 5.5 10 800 -65 to 150 -40 to 150 300 Unit V A uJ V mA mW o C o C o C Ptot Tstg TJ TL Block Diagram Vcc 7 34V Ground 5 2.50V VREF Good Logic T 2R R S R 1V Current Sense Comparator UVLO S/R 5V REF Internal Bias 6 8 VREF 5V 50mA RT/CT 4 Error AMP. + - OSC Output VFB COMP Current Sense 2 1 3 PWM Latch H3842S HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Pin Connection (Top View) SOP-8P Function Pin1: Compensation Pin2: Voltage Feedback Pin3: Current Sense Pin4: RT/CT 1 2 3 4 Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 2/10 8 7 6 5 Pin5: Ground Pin6: Output Pin7: Vcc Pin8: Vref Description This pin is the Error Amplifier output and is made available for loop compensation. This is the inverting input of the Error Amplifier. It's normally connected to the switching power supply output through a resistor divider. A voltage proportional to inductor current is connected to this input. The PWM uses this information to terminate the output switch conduction. The oscillator frequency and maximum output duty cycle are programmed by connecting resistor RT to Vref and cpacitor CT to ground. Operation to 500kHz is possible. This pin is the combined control circuitry and power ground. This output directly drives the gate of a power MOSFET. Peak currents up to 1A are sourced and sunk by this pin. This pin is the positive supply of the control IC. This is the reference output. It provides charging current for capacitor CT through resistor RT. Thermal Data Symbol Rth j-amb Description Thermal Resistance Junction-ambient Max. 100 o Units C/W Electrical Specifications Parameter Under-Voltage Lockout Section Start Threshold Min. Operating Voltage After Turn On 14.5 8.5 16 10 17.5 11.5 V V Test Conditions Min. Typ. Max. Units Electrical Characteristics Unless otherwise stated, specifications apply for 0Ta70C Vcc =15V (Note 1); RT=680, CT=0.022uF for triangular mode, RT=10k, CT=3.3nf for sawtooth mode Parameter Reference Section Reference Output Voltage Line Regulation Load Regulation Temperature. Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short current Oscillator Section Frequency Frequency Chnge with Temperature Frequency Change with Temperature Oscillator Voltage Swing Discharge Current H3842S Test Conditions Tj=25C,Io=1mA 12VVin25V 1mAIo20mA (Note 2) Min. 4.90 4.82 -30 47 46 7.8 7.2 Typ. 5 2.0 3.0 0.2 50 5 -100 52 52 0.2 5 0.5 1.7 8.3 - Max. 5.1 20 25 5.18 -180 57 60 1 9.3 9.5 Units V mV mV mV/C V uV mV mA KHz KHz % % % V mA mA Line , Load , Temp (Note 2) 10Hzf10kHz,Tj=25C (Note 2) Ta=125C,1000Hrs (Note 2) Ta=25C Tj=25C TlowTaThigh 12VVcc25V TlowTaThigh (Note 2) Tj=25C Peak to Peak Tj=25C TlowTaThigh HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Parameter Oscillator Section Frequency Frequency Chnge with Temperature Frequency Change with Temperature Oscillator Voltage Swing Discharge Current Error Amplifier Section Voltage Feedback Input Input Bias Current Open Loop Voltage Gain Unity Gain Bandwidth Power Supply Rejection Ratio Output Current Output Voltage Swing High State Low State Current Sense Section Current Sense Input Voltage Gain Maximum Current Sense Input Thresold Ppwer Supply Rejection Ratio Input Bias Current Propagation Delay Output Section Output Voltage Output Voltage Rise Time Output Voltage Fall Time Output Voltage with UVLO Activated Total Device Start-Up Current Operating Supply Current Vcc Zener Voltage Vpin2=Vpin3=0, RT=10K, CT=3.3nF Icc=25 mA Low State (Isink=20mA) Low State (Isink=200mA) High State (Isource=20mA) High State (Isource=200mA) Tj=25C, CL=1.0nF (Note 2) Tj=25C, CL=1.0nF (Note 2) Vcc=6V , Isink=1.0mA 13 12 (Notes 3 & 4) (Note 3) Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 3/10 Test Conditions Tj=25C TlowTaThigh 12VVcc25V TlowTaThigh (Note 2) Tj=25C Peak to Peak Tj=25C TlowTaThigh Vo=2.5V VFB=5.0V 2Vo4 V Tj=25C (Note 2) 12VVcc25V Sink (Vo=1.1V, VFB=2.7V) Source (Vo=5.0V, VFB=2.3V) VFB=2.3V, RL=15K to ground VFB=2.7V, RL=15K to Vref Min. 47 46 7.8 7.2 2.42 65 0.7 60 2.0 -0.5 5 2.85 0.9 - Typ. 52 52 0.2 5 0.5 1.7 8.3 2.50 -0.1 90 1.0 70 12 -1.0 6 0.7 3.0 1.0 70 -2.0 150 0.1 1.5 13.5 13.4 50 50 -0.1 0.1 11 34 Max. 57 60 1 9.3 9.5 2.58 -2.0 1.1 3.15 1.1 -10 300 0.4 2.2 150 150 -1.1 0.5 17 - Units KHz KHz % % % V mA mA V uA dB MHz dB mA mA V V V/V V dB uA nS V V V V nS nS V mA mA V 12VVcc25V (Note 3) Tj=25C (Note 2) Note 1: Adjust Vcc above the start threshold before setting at 15V. Note 2: These parameters, although guaranteed are not 100% tested in production. Note 3: Parameter measured at trip point of latch with Vpin2=0. Note 4: Gain defined as: A=Vpin1/Vpin3, 0Vpin30.8V H3842S HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Characteristics Curve Oscillator Frequency & Timing Resistance 10000K 100 Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 4/10 Maximum Duty Cycle & Timing Resistance 80 1000K CT=1.0nF CT=2.2nF 60 fo(Hz) 100K fo(Hz) 40 20 0 100 CT=4.7nF 10K 1K 100 1000 10000 100000 1000 10000 100000 RT() RT() Oscillator Discharge Current & Temperate 9 100 Vi=15V Vosc=2V 80 Error Amp Open-Loop Gain and Phase & Frequency Vcc=15V Vo=2V to 4V RL=100K o Ta=25 C 30 60 Phase 90 120 150 180 10 100 1000 10000 100000 1000000 10000000 8.5 Gain 60 Idischg (mA) (dB) -50 -25 0 25 o 8 40 20 7.5 0 7 50 75 100 125 -20 TA ( C) f (Hz) Current Sense Input Threshold & Error Amp Output Voltage 1.2 Vcc=15V 1 Reference Voltage Change & Source Current 60 50 Vcc=15V 40 0.8 Vth (V) 0.6 0.4 0.2 0 0 Ta=25 C Ta=125 C o o 30 Ta=-40 C o 20 Ta=125 C 10 o Ta=25 C o Ta=-40 C o 0 2 4 6 8 0 20 40 60 80 100 120 Vo (V) Iref (mA) H3842S HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 5/10 Reference Short Circuit Current &Temperature 110 25 Supply Current & Supply Voltage 100 Vcc=15V RL0.1 20 RT=10K CT=3.3nF 90 Isc (mA) 15 80 Ii (mA) 10 5 0 -50 -25 0 25 50 75 100 125 0 70 60 50 TA ( C) o 10 20 30 40 Vi (V) Output Saturation Voltage & Load Current 0 Source Saturation (Load to Ground) -1 Ta=25 C o Output Saturation Voltage & Load Current 4 Sink Saturation (Load to Vcc) 3 Vsat (V) Vsat (V) Ta=-40 C 2 Ta=25 C o o -2 Ta=-40 C o -3 Vcc=15V 80us Pulsed Load 120Hz Rate 1 Vcc=15V 80us Pulsed Load 120Hz Rate -4 0 200 0 Io (mA) 400 600 800 0 200 Io (mA) 400 600 800 H3842S HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Application Information Open Loop Test Circuit Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 6/10 Vref 4.7K HPN2222A 100K Error Amp. Adjust 1K COMP VFB I SENSE Adjust I SENSE 5K RT/CT 1 2 3 4 RT V REF 8 7 6 5 Vcc Output Ground A 0.1uF 0.1uF 1W 1K Vcc H3842 Output 4.7K Ground CT High peak currents associated with capacitive loads necessitate careful grounding techniques. Timing and bypass capacitors should be connected close to pin5 in a single point ground. The transistor and 5K potentiometerare used to samplethe oscillator waveform and apply an adjustable ramp to pin3. Oscillator and Output Waveforms Vcc 7 8 PWM RT 4 Id CT CT 5 GND Output Small RT / Large CT Clock Oscillator 5V REG 1 3 2 CT 6 Output Output Large RT / Small CT Error Amp Configuration Under Voltage Lockout 2.5V + V FB 2 COMP 1 Zf 1mA Vi 7 ON/OFF Command To Rest Of IC Icc Zi <17mA Von Voff H3842 16V 10V <0.5mA Voff Von Vcc H3842S HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 7/10 Current Sense Circuit Error Ampl. Is R Rs C Current Sense 5 GND COMP 1 3 R 1V 2R Current Sense Comparator Peak current (Is) is determined by the formula Is(max.) 1V/Rs A small RC filter may be required to suppress switch transients. Slope Compensation Techniques VREG RT RT/CT Is R SLOPE R1 Rs CT ISENSE 8 RT 4 H3842 3 VREG 8 RT/CT Is R SLOPE R1 GND Rs CT ISENSE 5 4 H3842 3 5 GND Isolated MOSFET Drive and Current Transformer Sensing Vcc 7 5.0Vref + Vin 6 Isolation Boundary Q1 VGS Waveforms + 0 50%DC 3 C R Rs Ns Np + 0 25%DC Ipk=((Vpin1-1.4)/3Rs)(Ns/Np) + S R + Q COMP/Latch H3842S HSMC Product Specification HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 8/10 Latched Shutdown 4 8 R R + + 1mA 2 1 2R EA R 5 2N3905 2N3903 BIAS OSC SCR must be selected for a holding current of less than 0.5mA at TA(min). The simple two transistor circuit can be used in place of the SCR as shown. All resistors are 10K. Error Amplifier Compensation From Vo Ri Rd Cf Rf 2.5V + EA + 1mA 2R R 5 + + EA 1mA 2R R 5 2 1 Error Amp compensation circuit for stabilizing any current-mode topology except for boost and flyback converters operating with continuous inductor current From Vo Rp Cp Ri Rd Cf Rf 2.5V 2 1 Error Amp compensation circuit for stabilizing current-mode boost and flyback topologies operating with continuous inductor current. External Clock Synchronization Vref 8 R RT R 4 CT External Sync Input 0.01uF 47 2 1 + EA 5 + BIAS OSC 2R R The diode clamp is required if the Sync amplitude is large enough to cause the bottom side of CT to go more than 300mV below ground HSMC Product Specification H3842S HI-SINCERITY MICROELECTRONICS CORP. Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 9/10 External Duty Cycle Clamp and Multi Unit Synchronization Vref RA RB 8 8 6 5 5K + 2 C 5K 1 NE555 1 To Additional H3842 S 2 5K + R Q 3 7 4 + + EA 2R 5 R 4 R BIAS R OSC f=1.44/((RA+2RB)C), Dmax=RB/(RA+2RB) Soft-Start Circuit 8 R BIAS R 4 + + 2 1M C 1 5 EA 1mA 2R + R 1V R OSC S 5Vref + - Q Soft-Start and Error Amplifier Output Duty Cycle Clamp 7 8 R R 4 + + 2 R2 C R1 1 EA 1mA BIAS OSC Vclamp 2R R 5 BC109 1V + S Q R Comp/Latch + Vcc Vin 5Vref + - 7 6 Q1 5 Rs Vclamp=R1/(R1+R2) where 0 HI-SINCERITY MICROELECTRONICS CORP. SO-8 Dimension Top View A Right side View G Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 10/10 Marking: 8 7 6 5 H3842S I B C H 1 2 3 4 Date Code 8-Lead SO-8 Plastic Package HSMC Package Code: S J D Front View Part A E Part A K L N O M F DIM A B C D E F G H Inches Min. 0.1909 0.1515 0.2283 0.0480 0.0145 0.1472 0.0570 0.1889 Max. 0.2007 0.1555 0.2441 0.0519 0.0185 0.1527 0.0649 0.2007 Millimeters Min. Max. 4.85 5.10 3.85 3.95 5.80 6.20 1.22 1.32 0.37 0.47 3.74 3.88 1.45 1.65 4.80 5.10 DIM I J K L M N O Inches Min. 0.0019 0.0118 0.0074 0.0145 0.0118 0.0031 0.0000 Max. 0.0078 0.0275 0.0098 0.0204 0.0197 0.0051 0.0059 *: Typical Millimeters Min. Max. 0.05 0.20 0.30 0.70 0.19 0.25 0.37 0.52 0.30 0.50 0.08 0.13 0.00 0.15 Notes: 1.Dimension and tolerance based on our Spec. dated Aug. 01,1999. 2.Controlling dimension: millimeters. 3.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material. 4.If there is any question with packing specification or packing method, please contact your local HSMC sales office. Material: * Lead: 42 Alloy; solder plating * Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0 Important Notice: * All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of HSMC. * HSMC reserves the right to make changes to its products without notice. * HSMC semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems. * HSMC assumes no liability for any consequence of customer product design, infringement of patents, or application assistance. Head Office And Factory: * Head Office (Hi-Sincerity Microelectronics Corp.): 10F.,No. 61, Sec. 2, Chung-Shan N. Rd. Taipei Taiwan R.O.C. Tel: 886-2-25212056 Fax: 886-2-25632712, 25368454 * Factory 1: No. 38, Kuang Fu S. Rd., Fu-Kou Hsin-Chu Industrial Park Hsin-Chu Taiwan. R.O.C Tel: 886-3-5983621~5 Fax: 886-3-5982931 H3842S HSMC Product Specification |
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