TSM007IDT

TSM007 Primary PWM Controller s s s s s s Current-mode PWM Controller Internal Under Voltage Protection Programmable Under Voltage High-current Output Drive Suitable for Power Mosfet Programmable Soft Start 2kV ESD Protection DESCRIPTION The TSM007 integrated circuit incorporates all circuitry to implement off line or DC-DC power supply applications using a fixed frequency current mode control. Based on a standard current mode PWM controller, this device includes additional features for higher integration. N DIP-8 (Plastic Package) D SO-8 (Plastic Package) PIN CONNECTIONS (top view) 1 Comp 2 Brnout 3 CS 4 CT Ss Vin Out 8 7 6 APPLICATION s PC SMPS Gnd 5 ORDER CODE Part Number TSM007IN TSM007ID TSM007IDT Temperature Range 0, +95°C Package DIP SO SO Packaging Tube Tube Tape & Reel June 2004 1/12 TSM007 1 Block Diagram Block Diagram Vin 50µA Internal UVLO Standby Vref 2 Brnout Vin Brown_Out Vref_Status 725µA 28V 2R 1V R Comp_Cs Cs_Latch 1 Comp R S Q !Q Vin 7 3 CS Vref LEB 400µA Start up_Latch R S Q !Q Out 6 4 CT CT Comp_Osc 1mA Gnd 5 Vref 10µA 8 SS Css 4mA Soft start PIN DESCRIPTION Name COMP BRNOUT CS CT GND OUT VIN SS Pin 1 2 3 4 5 6 7 8 Type Analog input Analog input Analog input Timing capacitor Power supply Analog output Power supply Timing capacitor Function Current comparator for current mode control. Undervoltage. Current sense. Sets the oscillator frequency. Signal ground. Totem pole output to direct drive a power MOSFET. Supply input voltage. Soft start. 2/12 Absolute Maximum Ratings 2 Absolute Maximum Ratings Symbol Vin Io Iopeak Vcomp Isinkcomp VBrnout Vcs Vct Vout Vss Pt Tstg Tj ESD DC Supply Voltage DC Supply Voltage 1 DC output current Peak output current COMP terminal voltage COMP terminal sink current Brown out terminal voltage CS terminal voltage CT terminal voltage OUT terminal voltage SS terminal voltage Power dissipation at 25°C Storage temperature Junction temperature Electrostatic Discharge Value -0.3 to 25 0.1 1 -0.3 to 5.5 6 -0.3 to Vin -0.3 to 6.3 -0.3 to 5.0 -0.3 to Vin -0.3 to 6.4 500 -40 to 150 150 2 TSM007 Unit V A A V mA V V V V V mW °C °C kV 1) All voltage values, except differential voltage are with respect to network ground terminal (GND). OPERATING CONDITIONS Symbol Vcc Toper Parameter DC Supply Conditions Operating Free Air Temperature Range Value 12 to 25 0 to 95 Unit V °C 3/12 TSM007 3 Electrical Characteristics Symbol Oscillator Fosc Foscmax ∆fosc1 ∆fosc2 Ici Icd Vthct Vtlct ∆Vct Brown out Vbr Ibr-on Vbrin Comp Icomp Avcs Vthcs PSRR Ibcs Source surrent Gain Maximum sensing voltage Power supply voltage rejection ratio Input bias current Vcomp=5V 0V ≤ Vcs ≤ 0.8V Vcomp=5V 12V ≤ Vin ≤ 25V Vcs=2V Vcs = 0 to 1 V Vcomp = 2 V Iosink=20mA Iosink=200mA Iosource=20mA Iosource=200mA CL=1nF, 10% to 90% CL=1nF, 90% to 10% Vin=5V, Iosink=1mA Threshold voltage Brown out terminal source current Input voltage Vbr=3V, 0°C≤T≤ 70°C Oscillating frequency Maximum oscillating frequency Typical oscillating voltage stability Typical oscillating temperature stability Charge current Discharge current Upper trip point Lower trip point Amplitude Parameter Test Condition Electrical Characteristics Tamb = 25°C, Vin=12V, Ct=1.5nF unless otherwise specified Min Typ Max Unit 84 500 12V ≤ Vin ≤ 25V 0°C ≤ Ta ≤ 70°C Vct=2V Vct=2V 100 116 336 504 ±0.5 ±10 400 600 3.0 1.4 1.6 2.50 50 ±2.0 464 696 kHz kHz % % µA µA V V V V µA V µA 2.42 42 -0.3 0.5 2.85 0.9 2.58 58 Vin 0.950 3.15 1.1 10 0.725 3.00 1.0 70 0.5 Current sense V dB µA Leading edge blanking LEB Output VOL1 VOL2 VOH1 VOH2 tr tf VOL3 Dmax Soft start Iiss dIiss Idss VHss VLss VH VL dVuvlo Iin Istby 4/12 Source current Temperature stability Sink current Clamp voltage Low voltage UVLO top threshold UVLO bottom threshold UVLO hysteresis voltage Operating current Supply current in standby mode Vss=2V 0°C ≤ Ta ≤ 70°C Vss=2V, Vbr=2V Vbr=2V 8.9 7.3 dVuvlo=VH-VL CL=3.3nF, Vin=12V Vbr ≤ 1V, Vin=12V 9.5 7.9 1.6 10 250 8 7 4 4.2 10 10 12 13 Output low voltage 1 Output low voltage 2 Output high voltage 1 Output high voltage 2 Rise time Fall time UVLO saturation Maximum duty cycle 0.1 0.8 Vin-2.0 Vin-1.5 Vin-3.0 Vin-1.7 100 30 0.05 54 60 1.5 2.2 V V V V ns ns V % Delay to output 280 ns 150 60 1.1 66 0.2 10.1 8.5 µA µA mA V V V V V mA µA Internal Under Voltage Lockout (UVLO) Total current consumption 13 350 Functional Description 4 Functional Description Vref 1.4V_3.0V TSM007 TSM007: PWM Controller IC Internal UVLO function The Under Voltage Lock Out function disables the whole device when supply voltage is lower than the threshold. CT Comp_osc 400µA Vin CT 725µA 1mA Cs Latch Comp VF Vref block The Vref block provides an internal 5V reference voltage to the IC. An internal Vref status signal is active when Vref is lower than 4.7V and is used to drive the output driver low when Vref is not valid. S R !Q Q VF CS Comp_Cs 2R Startup latch The startup latch is set when the IC exits from standby mode or UVLO state. It is reset when the CT capacitor is discharged for the first time. Vcc R 1V UVLO Out Vref_Status Out Vref Vref 1.4V_3.0V Comp_osc 400µA Oscillator A capacitor from the CT pin to GND sets the oscillating frequency. Startup Latch CT CT 1mA S R !Q Q VCT 3V Ici=400µA 1.4V Icd=600µA Out Out Tc Td Vref 400µA Vref 400µA CT Icd Current sense input A voltage proportional to the transformer primary winding current is applied to the CS pin. The control IC uses this information to perform current mode control. The PWM function will be stopped if the CS pin voltage is greater than 1.0V. T = Tc+Td T = CT∆Vct/Ici + CT∆Vct/Icd Let’s assume F = 1/T =100KHz ==> CT = (IcixIcd) / (Fx∆Vct(Ici+Icd)) ==> CT = 1.5nF CT Ici 1mA CT CT 1mA 5/12 TSM007 Soft start A capacitor from the SS pin to GND provides the soft start function. The capacitor starts to charge when VIN reaches the UVLO threshold and Vref is good.The soft start block enables the IC to start with a progessive PWM duty cycle. The soft start period is set by the external capacitor Css. The soft start comparator drives the output driver low when the SS pin voltage is greater than the CT pin voltage minus one VF voltage.. Cs_latch CT CT VF Comp_osc Functional Description Brown out A voltage proportionnal to the Bulk capacitor voltage is applied to the BRNOUT pin. When this pin signal is less than 2.5V, the IC is disabled: SS and CT pins go low, Vref is disabled and the IC goes to standby mode. All bias currents are switched off. The 2.5V voltage at the negative input of comparator Comp_Brown out is still active. When Brown out voltage goes higher than 2.5V, Vref is enabled again. A startup period is started, and then a soft start occurs.. filtered Vin R S Q !Q R1 Ibr = 50µA 2.50V Ibr Brown out Vcc Comp_brown out Vref 1.4V_3.0V UVLO Iiss 10µA SS Iiss Css Idss 4mA Comp_SS R2 Vref_Status Vref Vref 1.4V_3.0V Comp_osc 400µA Out CT Out VCT-VF Iiss=10µA Startup Latch CT 1mA S R !Q Q 2.4V 0.8V Out SS Out Brown out 2.5V Ibr=50µA Out Tss = Soft start period Tss = Cssx(Vthct-VF)/Iiss Let’s assume Tss = 50ms ==> Css = TssxIiss/(Vthct-VF) ==> Css = 210nF Let’s assume BRNOUT acts for Vfiltered = 200V R2 = 15KΩ R1 = R2(Vfiltered - UVLO) / UVLO When BRNOUT is bellow 2.5V IR2 = Vfiltered(R1+R2) When BRNOUT is above 2.5V IR2 = Ibr + Vfiltered(R1+R2) BRNOUT = R2x(Ibr + Vfiltered(R1+R2)) R1 = 1185KΩ R2 = 167µA When BRNOUT is above 2.5V IR2 = 237µA BRNOUT = 3.55V 6/12 Functional Description COMP input This pin is connected to the current comparator for current mode control. The pin should be connected to the collector (primary side) of an optocoupler which anode (secondary side) is driven by the output of error amplifier. The COMP input is used to set the reference level for the current sense comparator. The current sense threshold is set to (Vcomp - 2 * Vbe ) / 3. TSM007 Output driver The OUT totem pole output is capable to sink and source more than 1.0A (peak) in order to direct drive a power MOSFET.. 28V Vin Standby consumption The low current value supply in stand by mode reduces the consumption .. VFiltered Gnd Out Rb R1 Rp Raux Cd D1 + 2 R2 Brnout Ss Vin 7 Out 6 8 4 5 TSM007 CS 3 CT Gnd Comp 1 Brnout 2.5V Out Istby Iin Istby When Brnout is below 2.5V, Vflitered below 200V the PWM is off. ==> Icc = Istby. RP = (Vfiltered-Vz)/Istby In normal mode, the Vfiltered voltage can go up to 400V. ==> Rpmax dissipation = (Vfiltered-Vin)²/Rp The Iin current is provided by the auxiliary winding. Let’s assume Vfiltered = 200V Rp = 620KΩ Rpmax dissipation = 220mW 7/12 TSM007 Fig. 1: Detailed Internal Schematic Functional Description Vin Ibr 50µA Internal UVLO Standby Vref 2 Brnout Vin 2.5V Comp_Brown out 28V Vref_Status Icomp 725µA 1 Comp 2R R Comp_Cs Cs_Latch 1V R S Q Vin !Q Q !Q Rb 7 3 CSVref LEB Ici 400µA Start up_Latch R S Comp_Ocs Icd 1mA Out 6 4 CT CT 3 - 1.4V Gnd 5 Vref Iiss 10µA Comp_SS 8 SS Css Idss 4mA 8/12 Functional Description Timing for PWM function CT TSM007 Timing for Soft Start function CT (COMP-2VF)/3 CT-VF CS Comp SS OUT Out Timing at Vref rise up and shut down Vin VH VL 9.5V 7.9V 2V Timing at UVLO rise up and shut down Vin VH VL 9.5V 7.9V 2V Internal UVLO Internal UVLO Vref 4.7V Brnout 2.5V VrefStatus Vref 4.7V CT 3V 1.4V VrefStatus Startup CT 3V 1.4V OUT Startup OUT 9/12 TSM007 Fig. 2: Application schematic Vfiltered R7 T1 R4 C1 L1 D1 C5 + D2 Rp R5 C3 C4 Functional Description F1 C6 L2 D5 Vout+ + C9 + C10 Gnd D3 R6 Raux + C7 R1 C2 D4 Q1 R12 R13 R14 2 8 4 5 Css R2 Ct Brnout Ss Vin 7 Out 6 U2 R8 R9 R16 U3 TL431 R11 C8 R10 R15 C11 CS U1 CT TSM007 Gnd 3 Comp 1 10/12 Package Mechanical Data 5 Package Mechanical Data TSM007 Plastic DIP-8 MECHANICAL DATA mm. DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 TYP 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. TYP. 0.130 MAX. inch P001F 11/12 TSM007 Package Mechanical Data SO-8 MECHANICAL DATA DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 8˚ (max.) 0.04 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0016023/C 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. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners © 2004 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Repubic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States www.st.com 12/12