HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 1/10 MICROELECTRONICS CORP. 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 Ptot Tstg TJ TL 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 Tamb≤25oC 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 Block Diagram Vcc 7 UVLO 34V Ground S/R 5 VFB COMP Current Sense H3842S 4 Error AMP. + - 2 1 3 VREF 5V 50mA Internal Bias 2.50V RT/CT 8 5V REF VREF Good Logic 6 T OSC 2R R S R 1V Output PWM Latch Current Sense Comparator HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 2/10 MICROELECTRONICS CORP. Pin Connection (Top View) SOP-8P Function Pin1: Compensation Pin2: Voltage Feedback 8 7 6 5 Pin3: Current Sense Pin4: RT/CT 1 2 3 4 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 Units C/W o Electrical Specifications Parameter Test Conditions Min. Typ. Max. Units 14.5 8.5 16 10 17.5 11.5 V V Under-Voltage Lockout Section Start Threshold Min. Operating Voltage After Turn On Electrical Characteristics Unless otherwise stated, specifications apply for 0≤Ta≤70°C Vcc =15V (Note 1); RT=680Ω, CT=0.022uF for triangular mode, RT=10k, CT=3.3nf for sawtooth mode Parameter Test Conditions Min. Typ. Max. Units Line , Load , Temp (Note 2) 10Hz≤f≤10kHz,Tj=25°C (Note 2) Ta=125°C,1000Hrs (Note 2) Ta=25°C 4.90 4.82 -30 5 2.0 3.0 0.2 50 5 -100 5.1 20 25 5.18 -180 V mV mV mV/°C V uV mV mA Tj=25°C Tlow≤Ta≤Thigh 12V≤Vcc≤25V Tlow≤Ta≤Thigh (Note 2) Tj=25°C Peak to Peak Tj=25°C Tlow≤Ta≤Thigh 47 46 7.8 7.2 52 52 0.2 5 0.5 1.7 8.3 - 57 60 1 9.3 9.5 KHz KHz % % % V mA mA Reference Section Reference Output Voltage Line Regulation Load Regulation Temperature. Stability Total Output Variation Output Noise Voltage Long Term Stability Output Short current Tj=25°C,Io=1mA 12V≤Vin≤25V 1mA≤Io≤20mA (Note 2) Oscillator Section Frequency Frequency Chnge with Temperature Frequency Change with Temperature Oscillator Voltage Swing Discharge Current H3842S HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 3/10 MICROELECTRONICS CORP. Parameter Test Conditions Min. Typ. Max. Units Tj=25°C Tlow≤Ta≤Thigh 12V≤Vcc≤25V Tlow≤Ta≤Thigh (Note 2) Tj=25°C Peak to Peak Tj=25°C Tlow≤Ta≤Thigh 47 46 7.8 7.2 52 52 0.2 5 0.5 1.7 8.3 - 57 60 1 9.3 9.5 KHz KHz % % % V mA mA Vo=2.5V VFB=5.0V 2≤Vo≤4 V Tj=25°C (Note 2) 12V≤Vcc≤25V Sink (Vo=1.1V, VFB=2.7V) Source (Vo=5.0V, VFB=2.3V) 2.42 65 0.7 60 2.0 -0.5 2.50 -0.1 90 1.0 70 12 -1.0 2.58 -2.0 - V uA dB MHz dB mA mA VFB=2.3V, RL=15K to ground 5 6 - V VFB=2.7V, RL=15K to Vref - 0.7 1.1 V 2.85 3.0 3.15 V/V 0.9 1.0 1.1 V - 70 -2.0 150 -10 300 dB uA nS 13 12 - 0.1 1.5 13.5 13.4 50 50 -0.1 0.4 2.2 150 150 -1.1 V V V V nS nS V - 0.1 11 34 0.5 17 - mA mA V 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 (Notes 3 & 4) (Note 3) 12V≤Vcc≤25V (Note 3) Tj=25°C (Note 2) Output Section Output Voltage Output Voltage Rise Time Output Voltage Fall Time Output Voltage with UVLO Activated Low State (Isink=20mA) Low State (Isink=200mA) High State (Isource=20mA) High State (Isource=200mA) Tj=25°C, CL=1.0nF (Note 2) Tj=25°C, CL=1.0nF (Note 2) Vcc=6V , Isink=1.0mA Total Device Start-Up Current Operating Supply Current Vcc Zener Voltage Vpin2=Vpin3=0, RT=10K, CT=3.3nF Icc=25 mA 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, 0≤Vpin3≤0.8V H3842S HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 4/10 MICROELECTRONICS CORP. Characteristics Curve Oscillator Frequency & Timing Resistance Maximum Duty Cycle & Timing Resistance 100 10000K 80 1000K CT=1.0nF 60 CT=4.7nF fo(Hz) fo(Hz) CT=2.2nF 100K 40 10K 20 1K 100 1000 10000 0 100 100000 1000 RT(Ω) 10000 100000 RT(Ω) Oscillator Discharge Current & Temperate Error Amp Open-Loop Gain and Phase & Frequency 9 Φ 100 Vi=15V Vosc=2V 80 Gain 30 60 8 (dB) Idischg (mA) 8.5 Vcc=15V Vo=2V to 4V RL=100K o Ta=25 C 60 40 90 Phase 20 120 0 150 7.5 7 180 -20 -50 -25 0 25 50 75 100 125 10 o 100 1000 TA ( C) 10000 100000 1000000 10000000 f (Hz) Current Sense Input Threshold & Error Amp Output Voltage Reference Voltage Change & Source Current 60 1.2 Vcc=15V 50 1 Vcc=15V 40 Vth (V) 0.8 30 o 0.6 Ta=25 C o 0.4 20 o Ta=125 C Ta=-40 C o Ta=125 C o o Ta=25 C Ta=-40 C 10 0.2 0 0 0 2 4 Vo (V) H3842S 6 8 0 20 40 60 80 100 120 Iref (mA) HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 5/10 MICROELECTRONICS CORP. Reference Short Circuit Current &Temperature Supply Current & Supply Voltage 110 25 100 Vcc=15V RL≤ 0.1Ω RT=10K CT=3.3nF 20 15 Ii (mA) Isc (mA) 90 80 10 70 5 60 50 0 -50 -25 0 25 o 50 75 100 125 0 10 20 TA ( C) 30 40 Vi (V) Output Saturation Voltage & Load Current Output Saturation Voltage & Load Current 0 4 Source Saturation (Load to Ground) Sink Saturation (Load to Vcc) -1 3 o Vsat (V) Vsat (V) Ta=25 C -2 o Ta=-40 C o Ta=-40 C 2 o Ta=25 C -3 1 Vcc=15V 80us Pulsed Load 120Hz Rate -4 Vcc=15V 80us Pulsed Load 120Hz Rate 0 0 H3842S 200 400 Io (mA) 600 800 0 200 400 Io (mA) 600 800 HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 6/10 MICROELECTRONICS CORP. Application Information Open Loop Test Circuit Vref 4.7KΩ RT 100KΩ COMP 1KΩ 2 I SENSE I SENSE Adjust 5KΩ 8 1 V FB Error Amp. Adjust A V REF HPN2222A 3 RT/CT Vcc 7 H3842 Output 6 1W 1KΩ 0.1uF Output Ground 5 4 Vcc 0.1uF 4.7KΩ 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 5KΩ potentiometerare used to samplethe oscillator waveform and apply an adjustable ramp to pin3. Oscillator and Output Waveforms Vcc 7 8 5V REG PWM CT 1 3 2 6 Output Clock RT 4 Output Oscillator Large RT / Small CT Id CT CT 5 GND Output Small RT / Large CT Error Amp Configuration Under Voltage Lockout 2.5V + V FB Zi Vi 7 ON/OFF Command To Rest Of IC COMP 1 Icc <17mA 2 - Zf 1mA Von Voff H3842 16V 10V <0.5mA Voff H3842S Von Vcc HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 7/10 MICROELECTRONICS CORP. Current Sense Circuit Error Ampl. 2R Current Sense Comparator COMP 1 Is R Rs R 3 C 1V Current Sense 5 GND 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 V REG V REG 8 RT RT/CT Is RT I SENSE R1 Rs RT/CT 4 CT R SLOPE 8 Is H3842 3 CT R SLOPE H3842 I SENSE 5 R1 Rs GND 4 3 5 GND Isolated MOSFET Drive and Current Transformer Sensing Vin Vcc 7 Isolation Boundary + 5.0Vref - Q1 VGS Waveforms 6 + - + 0 - S R + Q 50%DC 25%DC Ipk=((Vpin1-1.4)/3Rs)(Ns/Np) COMP/Latch R 3 C H3842S + 0 - Rs Ns Np HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 8/10 MICROELECTRONICS CORP. Latched Shutdown 4 OSC 8 R BIAS + R 1mA + - 2 1 2R EA R 5 2N3905 2N3903 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 From Vo 2R - EA 5 + Cf Rf 1mA + 2 Rd Error Amp compensation circuit for stabilizing any current-mode topology except for boost and flyback converters operating with continuous inductor current R 1 2.5V Rp Cp 1mA + 2 Ri + 2.5V 2R - Error Amp compensation circuit for stabilizing current-mode boost and flyback topologies operating with continuous inductor current. R EA 1 5 External Clock Synchronization Vref 8 R RT R 4 OSC + CT External Sync Input + 0.01uF 2 47Ω H3842S BIAS 1 - 2R EA R 5 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 HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 9/10 MICROELECTRONICS CORP. External Duty Cycle Clamp and Multi Unit Synchronization Vref 8 RA RB R 4 8 BIAS 5KΩ 6 R + 5 3 R 5KΩ 2 OSC 7 Q + 4 + S - + 2 - 5KΩ C 1 NE555 2R EA 1 R 5 To Additional H3842 f=1.44/((RA+2RB)C), Dmax=RB/(RA+2RB) Soft-Start Circuit 5Vref 8 + R - BIAS R 4 OSC + + 2 1MΩ - S 1mA Q + 2R EA R 1 - 1V R 5 C Soft-Start and Error Amplifier Output Duty Cycle Clamp Vcc Vin 7 5Vref R R 4 1mA + R2 1 - EA + - BIAS 7 OSC + 2 + 8 6 Q1 S Vclamp Q 2R R 1V + R 5 Comp/Latch 5 C R1 Rs BC109 Vclamp=R1/(R1+R2) where 0<Vclamp<1V, Ipk(max)=Vclamp/RS H3842S HSMC Product Specification HI-SINCERITY Spec. No. : HS200203 Issued Date : 2001.04.01 Revised Date : 2002.12.03 Page No. : 10/10 MICROELECTRONICS CORP. SO-8 Dimension Top View Right side View G A Marking: 8 7 6 5 H3 8 4 2S I C B Date Code 1 H 2 3 4 8-Lead SO-8 Plastic Package HSMC Package Code: S J E D Front View Part A Part A F Inches DIM Min. 0.1909 0.1515 0.2283 0.0480 0.0145 0.1472 0.0570 0.1889 A B C D E F G H K Max. 0.2007 0.1555 0.2441 0.0519 0.0185 0.1527 0.0649 0.2007 M L N O 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 *: 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 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 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