SIEMENS Controi ICs for Switched-Mode Power Supplies Features Direct control of the switching transistor @ Low start-up current Reversing linear overload characteristic Base current drive proportional to collector current Protective circuit in case of disturbance TDA 4601 Bipolar IC Type Ordering Code Package TDA 4601 Q67000-A2379 P-SIP-9 TDA 4601-D Q67000-A2390 P-DIP-18 L9 (pin 6 and pins 10 to 18 grounded) The integrated circuit TDA 4601/D is designed for driving, controlling and protecting the switching transistor in self-oscillating flyback converter power supplies as well as for protecting the overall power supply unit. In case of disturbance, the rise of the secondary voltage is prevented. In addition to the ICs application range including TV receivers, video tape recorders, hifi devices and active loudspeakers, it can also be used in power supply units for professional applications due to its wide control range and high voltage stability during increased load changes. www.chipinfo.ru 464 Be sure to visit CHIPINFO web site for more information. 01.90www.chipinfo.ru TDA 4601 Absolute Maximum Ratings Parameter Symbol Limit Values | Unit min. max. Supply voltage Vo 0 20 Vv Voltages Reference output V1 0 6 V Zero passage identification Ve 0.6 0.6 V Control amplifier V3 0 3 V Collector current simulation Va 0 8 V Blocking input Vs 0 8 V Base current cut-off point V7 0 Vo Vv Base current amplifier output Vs 0 Vo V Currents Zero passage identification hie -5 5 mA Control amplifier lis -3 3 mA Collector current simulation fia 0 5 mA Blocking input hs 0 5 mA Base current cut-off point a7 -1 1.5 A Base current amplifier output Tas -1.5 0 A Junction temperature Tj 125 C Storage temperature range Tstg 40 125 Cc Thermal resistances: system-air TDA 4601 Rinsa 70 K/W system-case TDA 4601 Rinsc 15 K/W system-air TDA 4601 D Rihsa 60 K/W system-air? TDA 4601 D Rtnsa 44 K/W Operating Range Supply voltage Vo 7.8 18 V Case temperature TDA 4601 Te 0 85 C Ambient temperature range? TDA 4601 D Ta 0 70 C 1) Case soldered on PC board without cocling surface 2) Case soldered on PC board with copper-clad 35 ym iayer, cooling surface 25 cm? 3) Rthsai = 44 K/W and Pv=1W Siemens Aktiengesellschaft Be sure to visit CHIPINFO web site for more information.www.chipinfo.ru TDA 4601 Characteristics Ta=25 C according to measurement circuit 1 and diagram Parameter Symbol Limit Values Unit min. | typ. | max. Start Operation Current consumption (Vi not yet switched on) Vo=2V Ig 0.5 mA Vo= 5V Ig 1.5 2.0 mA Vs=10V Ig 2.4 3.2 mA Switching point for V: Ve 11.0 14.8 12.3 Vv Normal Operation Vo = 10 V; Voont = -10 V3 Velok = +0.5 V; f= 20 kHz; duty cycle 1:2 after switch-on Current consumption Veont = -10 V Is 110 135 160 mA Voon = 0 V Io 50 75 100 mA Reference voltage 1<0.1mA Vi 4.0 4.2 4.5 V 11=5mA Vs 4.0 4.2 4.4 V Temperature coefficient of reference voltage TC: 10 1/K Control voltage Voon: = 0 V V3 2.3 2.6 2.9 V Collector current simulation voltage Voon = 0 V Va") 1.8 2.2 2.5 V Voom = OV 10 V AV4") 0.3 0.4 0.5 V Clamping voltage V5 6.0 7.0 8.0 V Output voltages Vicon = OV Var") 2.7 3.3 4.0 Vv Voon = 0 V Vas*) 2.7 3.4 4.0 Vv Veon = 0 V/- 10 V AVas 1.6 2.0 2.4 V Feedback voltage V2") 0.2 V *) DC component only siemens Aktiengesellschaft 466 Be sure to visit CHIPINFO web site for more information.TDA 4601 Protective Operation Vo = 10 V3 Veont = 10 Vi Velock = + 0.5 V; f= 20 kHz; duty cycle 1:2 Parameter Symbol Limit Values Unit min. typ. max. Current consumption Vs<1.9V Ig 14 22 28 mA Switch-off voltage Vs<1.9V Vo7 1.3 1.5 1.8 V Switch-off voltage Vs<1.9V Va 1.8 2.1 2.5 V Blocking input Blocking voltage Vane 0V Vs 570A] 5 V Supply voltage blocked for Vs Vo 6.7 7.4 7.8 Vv Voor = OV V1 off (with further reduction of Vs) AV 0.3 0.6 1.0 V Characteristics Ta = 25 C; according to measurement circuit 2 Parameter Symbol Limit Values Unit min. typ- max. Switching time (secondary voltage) fon 350 450 ms Voitage variation S3 = closed AN3 = 20 W AV 2 sec 100 500 mV Voltage deviation S2 = closed AN2 = 15W AV 2 sec 500 1000 | mV Standby operation Si = open secondary useful load = 3 W AV 2sec 20 30 V f 70 75 kHz The cooling conditions have to be optimized with regard to maximum ratings (Ta; Tj; Rinuc} Rensa). Siemens Aktiengesellschaft 467 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Circuit Description The TDA 4601 is designed for driving, controlling and protecting the switching transistor in flyback converter power supplies during start-up, normal and overload operations as well as during disturbed operation. In case of disturbance the drive of the switching transistor is inhibited and a secondary voltage rise is prevented. I. Start-Up The start-up procedures (on-mode) include three consecutive operating phases as follows: 1. Build-Up of Internal Reference Voltage The internal reference voltage supplies the voltage regulator and effects charging of the coupling electrolytic capacitor connected to the switching transistor. Current consumption will remain at /s < 3.2 mA with a supply voltage up to Vs approx. 12 V. 2. Enabling of Internal Voltage - Reference Voltage V: = 4 V Simultaneously with Vs reaching approx. 12 V, an internal voltage becomes available, providing all component elements, with the exception of the control logic, with a thermally stable and overload-resistant current supply. 3. Enabling of Control Logic In conjunction with the generation of the reference voltage, the current supply for the control logic is activated by means of an additional stabilization circuit. The integrated circuit is then ready for operation. The start-up phase above described are necessary for ensuring the charging of the coupling electrolytic capacitor, which in turn supplies the switching transistor. Only then is it possible to ensure that the transistor switches accurately. ll. Normal Operating Mode / Control Operating Mode At the input of pin 2 the zero passages of the frequency provided by the feedback coil are registered and forwarded to the control logic. Pin 3 (control input, overload and standby identification) receives the rectified amplitude fluctuations of the feedback coil. The control amplifier operates with an input voltage of approx. 2 V and a current of approx. 1.4 mA. Depending on the internal voltage reference, the overload identification limits inconjunction with collector current simulator pin 4 the operating Siemens Aktiengeselischaft 468 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 range of the control amplifier. The collector current is simulated by an external RC combination present at pin 4 and internally set threshold voltages. The largest possible collector current applicable to the switching transistor (point of return} increases in proportion to the increased capacitance (10 nF). Thus the required operating range of the control amplifier is established. The range of control lies between a DC voltage clamped at 2 V and a sawtooth - shaped rising AC voltage, which can vary up to a max. amplitude of 4 V (reference voltage). During secondary load reduction to approx. 20 W, the switching frequency is increased (approx. 50 kHz) at an almost constant pulse duty factor (1:3). During additional secondary load decreases to approx. 1 W, the switching frequency increases to approx. 70 kHz and pulse duty factor to approx. 1:11. At the same time collector peak current is reduced to < 1 A. The output levels of the control amplifier as well as those of the overload identification and collector current simulator are compared in the trigger and forwarded to the control logic. Via pin 5 it is possible to externally inhibit the operations of the IC. The output at pin . . oe V pin 8 will be inhibited when voltages of < > 0.1 V are present pin at 5. Flipflops for controlling the base current amplifier and the base current shut-down are set in the control logic depending on the start-up circuit, the zero passage identification as well as on the enabling by the trigger. The base current amplifier forwards the sawtooth- spahed V4 voltage to the output of pin 8. A current feedback with an external resistor {(R = 0.68 Q) is present between pin 8 and pin 7. The applied value of the resistor determines the max. amplitude of the base driving current for the switching transistor. Ill. Protective Operating Mode The base current shut-down activated by the control logic clamps the output of pin 7 to 1.6 V. As a result, the drive of the switching transistor is inhibited. This protective measure is enabled if the supply voltage at pin 9 reaches a value < 6.7 V or if voltages of Mast 0.1 V are present at pin 5. s In case of short-circuits occurring in the secondary windings of the switched-mode power supply, the integrated circuit continuously monitors the fault conditions. During secondary, completely load-free operation only a small pulse duty factor is set. As a result the total power consumption of the power supply is held at N = 6...10 W during both operating modes. After the output has been inhibited for a voltage supply of < 6.7 V, the reference voltage (4 V) is switched off if the voltage supply is further reduced by AVs = 0.6 V. Protective Operating Mode at Pin 5 in Case of Disturbance The protection against disturbances such as primary undervoltages and/or secondary over- voltages (e.g. by changes in the component parameters for the switched-mode power supply) is realized as follows: Siemens Aktiengesellschaft 469 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Protective Operating Mode with Continuous Fault Condition Monitoring In case of disturbance the output pulses at pin 8 are inhibited by falling below the protective threshold Vs, with a typical value of V :/2. As a result current consumption is reduced (/9= 14 mA at Vo = 10 V). With a corresponding high-impedance start-up resistor), supply voltage Vs will fall below the minimum shut-down threshoid (5.7 V) for reference voltage V1. V: will be switched off and current consumption is further reduced to /s < 3.2 mA at Vas 10 V. Because of these reductions in current consumption, the supply voltage can rise again to reach the switch-on threshold of Vs = 12.3 V. The protective threshold at pin 5 is released and the power supply is again ready for operation. In case of continuing problems of disturbance (Vs < V 1/2 -0.1 V) the switch-on mode is interrupted by the periodic protective operating mode described above, i.e. pin 8 is inhibited and V is falling, etc. Block Diagram L Control + Base Current Start-Up Amplifier = i Amplifier incuit rigger Circui Start Standby =| Hold Coupling -C~ t Operation Charging Voltage Circuit Control 1 Overload . Control Base Current Identification| | Logic Shut-Down Reference Zero Passage Collector Current Ext. Blocking Voltage Identification Simulation Alternatives 7 1 2 3 4 5 6 uews? 7 8 9 ) in application circuit 1 10 ka/3 W Siemens Aktiengesellschaft 470 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 IV. Switch-On in the Wide Range Power Supply (90 Vac to 270 Vac) (application circuit 2} Self-oscillating flyback-converters designed as wide range power supplies require a power source independent of the rectified line voltage for TDA 4601. Therefore the winding polarity of winding 11/13 corresponds to the secondary side of the flyback converter transformer. Start-up is not as smooth as with an immediately available supply voltage, because TDA 4607 has to be supplied by the start-up circuit until the entire secondary load has been charged. This leads to long switch-on times, especially if low line voltages are applied. However, the switch-on time can be shortened by applying the special start-up circuit (dotted line). The uncontrolled phase of feedback control winding 15/9 is used for activating purposes. Subsequent to activation, the transistor T1 begins to block when winding 11/13 generates the current supply for TDA 4601. Therefore, the control circuit cannot be influenced during operation. Pin Functions Pin No. Function 1 Vrer output 2 Zero passage identification 3 Input control amplifier, overload amplifier 4 Collector current simulation 5 Connection for additional protective circuit 6 Ground (rigidly connected to substrate mounting plate) 7 DC output for charging coupling capacitor 8 Pulse output - driving of switching transistor 9 Supply voltage Siemens Aktiengesellschaft 474 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Circuit Diagram 3 a 3 | ja e an Siemens Aktiengesellschaft 472 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Test and Measurement Circuit 1 / \ O TDA 4601 2 2B ane i 7 ~~ q , , a oa > 22k | 100k V ID | J20KH | WR | == 10pF er 1N 4003 == 0nF | h : y 10 pF ml mT Vetock Veontrol UE 1389 V, Test Diagram: Overload Operation Vv Vetock ; [5 0 + + + ps 10 20730 40 60 70780 _-} -054 _ cont =~ 10V M, 3) ase ont = 0 2 1- 0 Hs Ve + ft | ft i I 1 i 1 ! 0 ps 1 7} UE 1399 Siemens Aktiengesellschaft 473 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Application Circuit 1 Test and Measurement Circuit 2 220 Vac - / Lane deme O ani a i) prof} i. a TDA 4601 r + | Bl 7 TEE 5 a ZN 4007 ht I 2202 1 oF 109 | 0.689 IN 22 12kQ | fo th ! | 100 pF/ p25 10kQ/3W 220 pF 100pF ev [0 Fi 1H 4 Si 1.258 270k LIKOLJka| 10nF > 100 pF/M6V | my ye 5 2) (|{1N 4007 3 1 uF /35V we :| y ZABY 258/200 8 5 1472-K 2| 7 BY 295/450 | | 10y nF | 8 2nF ry Wadi BU 208 : | It p fh dint 4.007 9 Oak n | : : [}oos 560 4 jt 1} | 4 | | i 2 eed 1 * . . { i i__bine Isolation AN 270 pF 1) Limits Jc max of BU 208 if the permissible output power is exceeded 2) Adjustment of secondary voltage 3) Must be discharged before iC change ~L_ Fay 258/600 470 pF - t+ 470 UF mM, 61-IC BY 258/800 eee eae i es ee Vy, sec Vasec V3 Sec - Protective circuit against rise of secondary voltage in case of disturbance Siemens Aktiengesellschaft www.chipinfo.ru 474 Be sure to visit CHIPINFO web site for more information. Vj secTDA 4601 Notes on application circuit 1 Protective Circuit against Secondary Voltage Rise even in Case of Disturbance During standby this circuit type is necessary only under certain conditions. If switch $1 is open and the secondary side is loaded with no more than 1 to 5 W, a secondary voltage overshoot of approx. 20% will occur. In case of disturbance (e.g. if the potentiometer is loosely contacted resulting in 10 kQ (2}, if the capacitor exhibits a 1 uF loss in capacitance, or if the 2 kQ resistor increases to a high-impedance value of 32 ka), the protective effect of the standard turn-off is not active before the point of return has been reached. The result is that energy is pumped into the secondary side during disturbance, which will not ease off before is reached the point of return at worst and, entails an instantaneous doubling of the voltage to 300 V (endangering the secondary electrolytic capacitors). This additional protective circuit, which identifies the energy surge as voltage overshoot, is directly active at control winding 9/15. Through the 56 resistor and the 1N4001 rectifier the negative portion is deducted and stored in the 10 uF capacitor. !f the amplitude exceeds the voltage of Z-diode BZX 83/39, pin 5 is drawn below the turn-off threshold, inhibiting further control pulses at pin 8. During disturbance conditions the voltage overshoot on the secondary side will assume maximum values of approx. 30%. Siemens Aktiengesellschaft 475 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Supplements to Test and Measurement Circuit 2 Efficiency versus output power kHz 100 UE 1392 80 . a 60 3 N a N\ ub. NN 40 <= | Pe ae 20 0 0 20 40 60 80 100 120 W Output Power 9 Efficiency versus output power % UE B93 100 yr t pe 80 t - ! : anf ee | a | = 60 ; at ee | : a : : i i f i. i _ 40 Wp ep 4 | 20 +o 4 | Top i | 0 | | po | 0 20 40 60 80 100 120 W Output Power * Siemens Aktiengesellschaft 476 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Supplements to Test and Measurement Circuit 2 Load characteristics V2sec = f (F2sec) 160 UE 1394 V 140 p) 120 A , > a Ly a 100 r 7 1 om , A, A Ve 250V > 80 - ? 1 3 OP Ving 220V 5 60 . to. o 40 Lp} 20 ? |__| a : ! oo (| 0 100 200 300 400 500 600 700 800 900 1000 mA 1200 Output Current Ig2se Output voltage V 2sec (Line change) UE 1395 151; sep 150 \ Output Voltage V, z ~O i \ 1468 i I 147 | 150 160 170 180 #190 200 210 220 230 240 250 V 260 Line Voltage = Siemens Aktiengesellschaft 477 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Application Circuit 2 Wide range from 80 to 270 Vac BOV to 270Vac o o | ( O ) roel usm B250/ | h C 1000 C2540 i a TDA 4601 K 231 - Pot_ + - . w 1 > 2B - 61) 819 PIC..-429 100 pF 6.8kQ HIN22 | 2202 +44 +OoH [gare " + , 1.2kQ C18 27kQ | s70pF 3) 1 re 100pF/25V C4 1} | 100 pF/6V \ | Si1.25A Li Lo] | ane I : 270 K2 Il 2x == OOpF/25V r+ x "TN 4007 10kQ2) 1pF/35V fll ul 15yH 8.2nF Y By 360 272 IL 4 I 270k2 Lg ci a BU208 = PRBY 360 | > , BD 139 | BY 231 1 pF/00V [Js Ka ) Bi rl BY 299 | 1002 ZNBY 360. ry 47nF 339 4h ae * 0 9 _| | [Line Jselation u > azv_ -+ :w + a! + mm, 2210 16 1 2 |" 019 270 pF BY 299 1) Limits Jc max of BU 208, r if permissible output power is exceeded. 270 pf== Weyw 29 270 pF == BY 298 56k? 2) Adjustment ot , secondary voltage. 4000 pF 470 pF 22pyF 3} Must be discharged }+ +--+ [+ before IC change. 4 rH 4 }-o 5 o V3 V; V, UE1396 Siemens Aktiengesellschaft 478 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Notes on application circuit 2 Wide Range SMPS Filtering of the rectified AC voltage has been increased up to 470 uF to ensure a constant and hum-free supply at V tne = 80 V AC. The stabilized phase is tapped for supplying the IC. In order to ensure good start-up conditions for the SMPS in the low voltage range, the non-stabitized phase of winding 13/15 is used as a starting aid (BD 139), which is turned off after start-up by means of Z-diode C12. In comparison to the 220 Vac standard circuit, however, the collector-emitter circuit had to be altered to improve the switching behavior of BU 208 for the entire voltage range (80 to 270 Vac). Diode BY 231 is necessary to prevent inverse operation of BU 208 and may be integrated for switching times with a secondary power < 75 W (BU 208 D). Compared to the IC TDA 4600-2, the TDA 4601 has been improved in turn-off during under- voltage at pin 5. The TDA 4601 is additionally provided with a differential amplifier input at pin 5, enabling precise turn-off at the output of pin 8 accompanied by hysteresis. For wide range SMPS, TDA 4601 is recommendable instead of TDA 4600-2. If a constant quality standard equal to that of the standard circuit is to be maintained, wide range SMPS (80 to 270 Vac) with secondary power of 120 W can only be implemented at the expense of time. Siemens Aktiengesellschaft 479 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Thermal Resistance TDA 4601 D Standardized, ambient-related thermal resistance Rin sai versus length | of a square copper-clad cooling area (35 um copper cladding) Rinsa (1 = 0) = 60 K/W Ta =70C Po =1W PC board in vertical position Circuit in vertical position Still air 10 WE 1397 Renate Renjati=o) | 09 0.8 Rensas = f tl } thia Example 0.6 0 50 mm 100 ee { Siemens Aktiengesellschaft 480 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Further Application Circuits Application Circuit 3 90V-270V ac 9 9 (" O thro 8250/ | C 1000 C2540 | TDA 4601 jenny . 1 PI 2 ye 15 16 7 8 79 4 . i an WIN 22 27K0[ 15 kQ 100pF SKN {_220nF*Y 270k} 6.2kO 100 pF/28V l +|+ oa 32/09 ==100pF/16V = Ls 150k? 10kQ Si124 cc Taemnt nm x m 4 270 kN Line Isolation 1pF/35V fl 1) Limits fc max of BU 208 if permissible output Si 2A aKa power is exceeded. 1 I {_}_+ 2} Adjustment of secondary voltage. we 4 7 pF 3) Must be discharged before IC change. +_||_-+ Oo ViiSV yf BSV 4/36.5V UE1398 Siemens Aktiengesellschaft 481 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Notes on application circuit 3 Fully Insulated, Clamp-contacted PTC Thermistor Suitable for SMPS Applications at Increased Start-Up Currents The newly developed PTC thermistor Q63100-P2462-J29 is designed for applications in SMPS as well as in various other electronic circuits, which, for example, receive the supply voltage directly from the rectified line voltage and require an increased current during turn-on. Used in the flyback converter power supply of TV sets, an application proved millions of times over, the new PTC thermistor in the auxiliary circuit branch has resulted in a power saving of no less than 2 W. This increase in efficiency has a highly favorable effect on the standby operation of TV sets. The required turn-on current needs only 6 to 8 s until the operating temperature of the PTC thermistor is reached. Low thermal capacitance of the PTC thermistor allows the circuit to be operated again after no more than 2 s. Another positive feature is the improved short- circuit strength. The clamp contacts permit more or less unlimited switching operations and thus guarantee high reliability. A flame-retardant plastic package and small dimensions are additional advantages of this newly developed PTC thermistor. Technical Data Parameter Symbol Limit Values Unit Breakdown voltage at Ta = 60 C Vaprms 350 V Resistance at Ta = 25 C Res 5 ko Resistance tolerance AR 25 25 % Trip current (typ.) Ik 20 mA Residual current at Vamax Ta 2 mA Max. application voltage V op max rms 265 V Reference temperature (typ) TREF 190 c Temperature coefficient (typ) TC 26 %olK Max. operating current Tmax 0.4 A Storage temperature range Tstg 25 to 125 Cc Siemens Aktiengesellschatt 482 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.www.chipinfo.ru TDA 4601 Application Circuit 4 1) Limits Jc max of BU 508 A if permissible output Line Isolation power is exceeded. 2) Adjustment of secondary voltag 3) Must be discharg before IC change. Siemens Aktiengesellschaft e. ed 002 562 483 Be sure to visit CHIPINFO web site for more information. 220 Vac ? 9 ( O , GIF _qyeInF 8350/ Ty C1000 ij ney TDA 4601 | 27 ' 1 2 B 4 1s 6 7 8 19 ic -12 100pF Iuzz | 220 pF3) 2202 +-| 100 0 | 9680 | +||-4 1.2k9 C62 27kD : {HH | 100 pF/6V 56 T00pF/25v | Si 125aF] 10 Kal ] 1 4h | lo e carr == 100pF/25V 270kQ | 10kQ2) | Wee b 5 1672-K | | I B78108 = By 258/200 ! Wy 295/450 | | a aT BU SOBA Lys i sy 200V UET399TDA 4601 Notes on application circuit 4 improved Load Control and Short-Circuit Characteristics Turn-on is the same as for circuit 3. To make the price more attractive, switching transistor BU 508 A was selected. To ensure optimum standby conditions, the capacitance between pins 2 and 3 was increased to 100 pF. Z- diode C 6.2 transfers control voltage aVcon directly to pin 3 resulting in improved load control. Design and coupling conditions of various flyback transformers were sometimes a reason for overshoot spectra, which, despite the RC attenuating element 33 0 x 22 nF and the 10 kQ resistor, even penetrated across the feedback winding 9/15 to the zero passage indicator input (pin 2) and activated double and multiple pulses in the IC. Double and multiple pulses, however, lead to magnetic saturation in the flyback transformer and thus increase the risk of damaging the switched-mode power supply. The larger the quantities of power to be passed, the more easily overshoots are generated. This can be observed around the point of return. The switched-mode power supply, however, reduces its own power to a minimum in all cases of overload or short- circuit. A series resonant circuit, whose resonance corresponds to the transformer's self- oscillation, was created by combination of the 4.7 wH inductance and the 22 nF capacitance. This resonant circuit short-circuits overshoots via a 33 resistor. Siemens Aktiengesellschaft 484 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Application Circuit 5 1) Limits /c max of BU 508 A if permissible output voltage is exceeded. 220Vac 330IInF 47 mH | | 47mH 1 ol? tte ts siteOtsft2sdt sft Si2A a TDA 4601 AO 540 eb 1 2 B 4S 6 7 B19 leita 3kQ von HIN 22 3.3nF4) | 100pF3) 4702 oo ; | | 220pF/6v 40k +f} [ n 100 UF/25V eka /3W 2202 i | mor 1k9 6nF!)) == 100UF/I6V H {} 1 4N 4007 Z.2nF 150 yH 3.3pH BY 360 279 33nk 33091 | 270k0 [ Jzv0K0 | mt BU SOBA tt 2.2nF Line Isolation | 4 3072 Le 10) "1 "|? Hl yw RW BY 360 1000 pF a i. 1000 pF 2) Adjustment of secondary voltage. 3) Must be discharged before IC change. 4) Optional use, depending on safety class: Ky Safety class II 1 nF only } Safety class | with non-fused grounded conductor 3.3 nF only Siemens Aktiengesellschaft www.chipinfo.ru 485 a Be sure to visit CHIPINFO web site for more information. o12V duty E1600TDA 4601 Notes on application circuit 5 Highly Stable Secondary Side Power supplies for commercial purposes require highly constant low voltages and high currents which, on the basis of the flyback converter principle, can be realized only under certain conditions, but, on the other hand, are implemented for economical reasons. An electrically isolated flyback converter with a highly stable secondary side must receive the control information from this secondary side. There are only two possibilities for meeting this requirement: either through a transformer which is magnetically isolated from the flyback converter or by means of an optocoupler. The development of CNY 17 has enabled the manufacture of a component suitable for electrical isolation and characterized by high reliability and long-term stability. The IC TDA 4601 D is the sucessor of the TDA 4600 D. It is compatible with its predecessor in all operational functions and in the control of a self-oscillating flyback converter. Pin 3 is the input for the control information, where the latter is compared with the reference voltage prevailing at pin 1 and the control from the optocoupler and subsequently transformed into a frequency/pulse width control. The previous feedback and control information winding is not necessary. The feedback information (zero passage) is obtained from winding 3/4 - supply winding. The time constant chain 330 0/3.3 nF and 330 0/2.2 nF was implemented in series with 150 yH to prevent interference at pin 2. The LC element forms a series resonant circuit for overshoots of the flyback converter and short-circuits them. Siemens Aktiengeselischaftt 486 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Application Circuit 6 Non-Fused Grounded Conductor 90 to 260 Vac ? { | 47 mH fl 330 0F Bam | | ie [sft fa fr2__|t_ fo | | B250/ | C 1000 7 TDA 4601 ( 2540 | = + - | 1 2 [3 16 1S 6) 18 19 Mer. 13 | K 23) Wt 100 pF 56k | IN22 2202 + rity 398 | + 1.2k2 27kQ | 100 0F3! + I} p 100 pF/25V | 100 yF/6V | | 10 P12 4t+ | S105A k &7nF" 270kQ LKR LIka == 100pF/16V j _r hl a H 68 pH ql | 2,.2nF 2) pH } |; 10k | | iy IN 4007 | 1pF/35V > | fil 2.2pH | I | 3.3nF Wy 360 272 | { +1_H | 270k | LF ! C11 BY 360 +$t_ BUSO8A aoe ___ N22 1pF/100V === ]5 Turns ! 22nF | 100% | 33nF Low + | 1 | 2.2nF ALN L ___ 77 7196 4 + 11/12 10 270 pF == VY BYW 72 1) Limits /c max of BU 508 A Cd 2209 70 pF BY 360 if permissible output 2p l power is exceeded. 10pF 1000 pF 2) Adjustment of secondary voltage. t+-}-+ t- 3) Must be discharged b before iC change. - Vy &&V/10mA V, 12V/2A UE 1401 siemens Aktiengesellschaft 487 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Notes on application circuit 6 Wide Range Plug SMPS up to 30 W Due to their volume and weight, plug SMPS have so far been limited to a restricted primary voltage and a secondary power of no more than 6 W. The line-isolated wide range flyback converter presented here has a variable frequency and is capable of producing a secondary power of 30 W. It is characterized by a compact design with an approx. weight of 400 g. The entire line voltage range of 90 to 260 Vac is stabilized to +1.5% on the secondary side. Load fluctuations between 0.1 and 2 A are regulated to within 5%. The output (secondary side) is overload, short-circuit, and open- loop proof. Siemens Aktiengesellschaft 488 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Application Circuit 7 90 to 260 V ac 9 9 ( O Y Lr jee 9250 | | en TDA 4601 . x23 -KDt->- 7 73 Te TS 6 7 B19 Hoprc.-1 | tour 6 8k0 HN 22 | 470 uF 3) 2202 4H +{ ++ nat [ora . 4 4 12k | C4 27k 270k0 100 ,F/6V 100 pE/25V | 10. [72 ||-+ si 125aQ] [Ik KQ) | &7nFl == 100 pF/ EV mend IH. WKN 2) 1pF/35V C18 +||_ vy 1SpH 8.2nF 360 270 kQ aa LF (12 My, BU208 = AR BY 360 Ft + BC 639| 72 fe By 231 1pF/100V kQ Pt +| BY 299 100 2 ZRKBY 360 + 4 7nF | | | | | | | | | | | | , 332 W } * Sim 3 |. | j Line Isolation 7 _AZV__ 1) Limits Jc max of BU 508 A if permissible output power is exceeded. 2) Adjustment of secondary voltage. 3) Must be discharged before IC change. Siemens Aktiengesellschaft 489 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Notes on application circuit 7 Wide Range SMPS with Reducing Peak Collector Current Jc su 2s for Rising Line Voltage (variable point of return) Wide range SMPS have to be dimensioned at line voltages of 90 to 260 Vac. The difference between the maximum collector current /c BU 208 max and the largest possible limit current JC BU 208 limit which causes magnetic saturation of the flyback transformer and flows through the primary inductance winding 5/7 is to be determined at Vac min (/C BU 308 limit 2 1.2 x /C BU 208 max). Then, the transmissible power of the flyback transformer and its value at Vac max is to be determined. In the standard circuit the collector current /C BU 208 max is almost constant at the point of return independent of the line voltage. The transmissible power on the secondary side, however, increases at the point of return in proportion to the rising rectified line voltage applied (figures 1 and 2). In the wide range SMPS a line voltage ratio of 270/90 = 3/1 is obtained, causing doubling of the transmissible power on the secondary side, i.e. in the wide range SMPS a far too large flyback transformer had to be implemented. The point of return protecting the SMPS against overloads or short circuits, is derived from the time constant at pin 4 74 = 270 kQ x 4.7 nF. Thus, the largest possible pulse width is determined. With the introduction of the 33 kQ resistor this time constant is reduced as a function of the control voltage applied to winding 13/15, rectified by diode BY 360 and filtered by the 1 wF capacitance, which means that the pulse time becomes shorter. By means of the Z-diode C18 the line voltage level can be defined at which the influence of the time constant correction becomes noticeable. The change in the rectified voltage of winding 13/15 is proportiona! to the change in the rectified line voltage. At the point of return /c BU 208 the peak collector current has been reduced with the aid of the given values from 5.2 A at 90 Vac to 3.3 A at 270 Vac. The transmissible power at the point of return remains stabie between 125 and 270 Vac due to the set activation point of the point of return correction (unbroken curve in figure 2). Siemens Aktiengesellschaft 490 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.TDA 4601 Load Characteristics Figure 1 Vv 200 : ) 1 UE 1403 70 kHz Standby 100 ry : i 22 kHz Point of Return "60 St Control Ran See a 440 SSE > 50 kHz F< 18 kHz | 120 100 80 t Overload Range 6 Z | 40 Zo ircui fo 3k Hz Short Circuit y, 8 NN orn 6kHz 5 Ne" 0 02 04 06 08 10 12 1 16 A Te T5ec Figure 2 0 os 10 15 20 25 30 35 40 45 A Bec Siemens Aktiengesellschaft 491 www.chipinfo.ru Be sure to visit CHIPINFO web site for more information.