TSM007 Primary PWM Controller ■ ■ ■ ■ ■ ■ 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. N DIP-8 (Plastic Package) PIN CONNECTIONS (top view) Based on a standard current mode PWM controller, this device includes additional features for higher integration. APPLICATION ■ D SO-8 (Plastic Package) 1 Comp Ss 8 2 Brnout Vin 7 3 CS Out 6 4 CT Gnd 5 PC SMPS ORDER CODE Part Number TSM007IN TSM007ID TSM007IDT June 2004 Temperature Range Package Packaging 0, +95°C DIP SO SO Tube Tube Tape & Reel 1/12 TSM007 1 Block Diagram Block Diagram Vin Internal UVLO 50µA 2 Brnout Standby Vref Brown_Out Vin Vref_Status 28V 725µA 2R 1 Comp Comp_Cs Cs_Latch 1V R 3 CS R Q S !Q Vin 7 Start up_Latch Vref R Q S !Q LEB 400µA 4 CT Out 6 Comp_Osc CT 1mA Gnd 5 Vref 10µA Soft start 8 SS Css 4mA PIN DESCRIPTION Name COMP BRNOUT CS CT GND OUT VIN SS 2/12 Pin Type 1 2 3 4 5 6 7 8 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. Absolute Maximum Ratings 2 TSM007 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 Unit -0.3 to 25 V 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 A A V mA V V V V V mW °C °C kV Value Unit 12 to 25 0 to 95 V °C 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 3/12 TSM007 3 Electrical Characteristics Electrical Characteristics Tamb = 25°C, Vin=12V, Ct=1.5nF unless otherwise specified Symbol Parameter Test Condition Min Typ Max Unit 84 500 100 116 ±0.5 ±10 400 600 3.0 1.4 1.6 ±2.0 kHz kHz % % µA µA V V V Oscillator Fosc Foscmax ∆fosc1 ∆fosc2 Ici Icd Vthct Vtlct ∆Vct Oscillating frequency Maximum oscillating frequency Typical oscillating voltage stability Typical oscillating temperature stability Charge current Discharge current Upper trip point Lower trip point Amplitude 12V ≤ Vin ≤ 25V 0°C ≤ Ta ≤ 70°C Vct=2V Vct=2V 336 504 464 696 Brown out Vbr Ibr-on Vbrin Threshold voltage Brown out terminal source current Input voltage Vbr=3V, 0°C≤T≤ 70°C 2.42 42 -0.3 2.50 50 2.58 58 Vin V µA V Vcomp=5V 0.5 0.725 0.950 µA 0V ≤ Vcs ≤ 0.8V Vcomp=5V 12V ≤ Vin ≤ 25V Vcs=2V 2.85 0.9 3.00 1.0 70 0.5 3.15 1.1 Comp Icomp Source surrent Current sense Avcs Vthcs PSRR Ibcs Gain Maximum sensing voltage Power supply voltage rejection ratio Input bias current 10 V dB µA Leading edge blanking LEB Delay to output Vcs = 0 to 1 V Vcomp = 2 V 280 ns Output VOL1 VOL2 VOH1 VOH2 tr tf VOL3 Dmax 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 Iosink=20mA Iosink=200mA Iosource=20mA Iosource=200mA CL=1nF, 10% to 90% CL=1nF, 90% to 10% Vin=5V, Iosink=1mA Source current Temperature stability Sink current Clamp voltage Low voltage Vss=2V 0°C ≤ Ta ≤ 70°C Vss=2V, Vbr=2V 0.1 0.8 Vin-2.0 Vin-1.5 Vin-3.0 Vin-1.7 100 30 0.05 54 60 1.5 2.2 150 60 1.1 66 V V V V ns ns V % Soft start Iiss dIiss Idss VHss VLss 8 7 4 4.2 10 10 Vbr=2V 12 13 0.2 µA µA mA V V Internal Under Voltage Lockout (UVLO) VH VL dVuvlo UVLO top threshold UVLO bottom threshold UVLO hysteresis voltage 8.9 7.3 10.1 8.5 dVuvlo=VH-VL 9.5 7.9 1.6 V V V CL=3.3nF, Vin=12V Vbr ≤ 1V, Vin=12V 10 250 13 350 mA µA Total current consumption Iin Istby 4/12 Operating current Supply current in standby mode Functional Description 4 TSM007 Functional Description TSM007: PWM Controller IC Vref 1.4V_3.0V Comp_osc Internal UVLO function 400µA The Under Voltage Lock Out function disables the whole device when supply voltage is lower than the threshold. CT Vin CT 725µA 1mA Vref block Cs Latch 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. Comp VF VF CS !Q R Q Comp_Cs Startup latch 2R 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 S R 1V Out UVLO Out Vref_Status Vref Oscillator Vref 1.4V_3.0V Comp_osc A capacitor from the CT pin to GND sets the oscillating frequency. 400µA CT Startup Latch CT S !Q VCT 3V 1mA R Ici=400µA Q Icd=600µA 1.4V Out Tc Out Td Vref Vref 400µA 400µA Current sense input CT 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. CT Ici Icd 1mA CT 1mA CT 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 5/12 TSM007 Functional Description Soft start Brown out 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.. 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.. Cs_latch CT Comp_osc CT VF R Q S !Q filtered R1 Ibr = 50µA Comp_brown out 2.50V Ibr Vref Vin Brown out 1.4V_3.0V Vcc UVLO R2 Iiss 10µA Vref_Status SS Vref Iiss Idss 4mA Css Comp_SS Vref 1.4V_3.0V Comp_osc 400µA CT Out 2.4V 0.8V Startup Latch Out VCT-VF CT S !Q R Q 1mA Iiss=10µA SS Out Out Out Brown out 2.5V Ibr=50µA Tss = Soft start period Tss = Cssx(Vthct-VF)/Iiss Let’s assume BRNOUT acts for Vfiltered = 200V Let’s assume Tss = 50ms R2 = 15KΩ ==> Css = TssxIiss/(Vthct-VF) R1 = R2(Vfiltered - UVLO) / UVLO ==> Css = 210nF 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 TSM007 COMP input Output driver 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. 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 .. Out Rb VFiltered Gnd R1 Rp Raux D1 + 7 Cd R2 2 Brnout 8 Ss 4 CT 5 Gnd Vin Out 6 TSM007 CS 3 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 Functional Description Fig. 1: Detailed Internal Schematic Vin Ibr 50µA Internal UVLO Standby Vref Comp_Brown out 2 Brnout Vin 28V 2.5V Vref_Status Icomp 725µA 1 2R Comp_Cs Cs_Latch Comp 1V R R Q S !Q Vin 3 CSVref 7 Start up_Latch R Q S !Q LEB Ici 400µA 4 CT Comp_Ocs CT Out 6 Rb Icd 1mA 3 - 1.4V Gnd 5 Vref Iiss 10µA 8 SS Css 8/12 Idss 4mA Comp_SS Functional Description TSM007 Timing for PWM function Timing for Soft Start function CT CT (COMP-2VF)/3 Comp CT-VF CS SS OUT Out Timing at Vref rise up and shut down Timing at UVLO rise up and shut down Vin Vin VH VL 9.5V 7.9V 2V Internal UVLO VH VL 9.5V 7.9V 2V Internal UVLO Vref Brnout 4.7V 2.5V VrefStatus Vref 4.7V CT Startup OUT 3V 1.4V VrefStatus CT 3V 1.4V Startup OUT 9/12 TSM007 Functional Description Fig. 2: Application schematic Vfiltered R7 C6 F1 T1 R4 L1 C1 D1 C5 + Vout+ L2 D2 Rp C3 R5 + C9 D5 C4 + C10 Gnd D3 Raux R6 + C7 D4 R1 R12 R13 R14 Q1 7 C2 Css R2 10/12 Vin 2 Brnout 8 Ss Out 6 4 CS U1 CT TSM007 5 Gnd 3 U2 R8 R9 R16 Comp 1 C11 U3 TL431 Ct R11 C8 R10 R15 Package Mechanical Data 5 TSM007 Package Mechanical Data Plastic DIP-8 MECHANICAL DATA mm. inch DIM. MIN. A MAX. MIN. 3.3 a1 0.7 B 1.39 B1 0.91 b b1 TYP TYP. 0.130 0.028 1.65 0.055 1.04 0.036 0.5 0.38 0.065 0.041 0.020 0.5 D 0.015 0.020 9.8 E 0.386 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 I Z 0.280 4.8 L 0.189 3.3 0.44 MAX. 0.130 1.6 0.017 0.063 P001F 11/12 TSM007 Package Mechanical Data SO-8 MECHANICAL DATA DIM. mm. MIN. TYP inch MAX. MIN. TYP. MAX. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8˚ (max.) 0.1 0.04 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