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Ricoh RV5VH Bedienungsanleitung

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Inhaltsverzeichnis der Gebrauchsanleitungen

  • Seite 1

    APPLICA TION MANU AL DC/DC CONVER TER CONTR OLLER R V5VH SERIES NO . EA-049-9803 ELECTR ONIC DEVICES DIVISION[...]

  • Seite 2

    NO TICE 1. The products and the product specifications described in this application manual are subject to change or discontinuation of production without notice for reasons such as improvement. Therefore, before deciding to use the products, please refer to Ricoh sales representatives for the latest information thereon. 2. This application manual [...]

  • Seite 3

    RV5VH SERIES APPLICA TION MANU AL CONTENTS OUTLINE ...................................................................................................... 1 FEA TURES ................................................................................................... 1 APPLICA TIONS ....................................................................[...]

  • Seite 4

    13) DC/DC2 F eed Back V oltage vs. T emperature ................................................... 30 14) EXT2 Output Current vs. T emperature ........................................................... 30 15) EXT2 Oscillator F requency vs. T emperature .................................................... 31 16) EXT2 Oscillator Duty Cycle vs. T em[...]

  • Seite 5

    1 DC/DC CONVER TER CONTROLLER R V5VH SERIES OUTLINE The RV5VH series are dual output CMOS DC/DC converter ICs integrating Step-up and inverting DC/DC converters. The RV5VH3 × × series ICs consist of an oscillator, two VFM control circuits, control transistors(EXT switches), a phase shift circuit, a voltage reference unit, an error amplifier, and [...]

  • Seite 6

    2 BLOCK DIA GRAM + – + – CSW V SEN V OUT1 L X1 D OUT FB EXT2 GND Vref Error Amp.1 Error Amp.2 1 2 3 4 8 7 6 5 VFM2 V LX lim. VFM1 OSC p_ shift + – DC/DC CONVER TER CONTROLLER (BOOST / INVER TING) R V5VH1 × × / RV5VH2 × × + – + – CSW V SEN V OUT1 EXT1 D OUT FB EXT2 GND Vref Error Amp.1 Error Amp.2 1 2 3 4 8 7 6 5 VFM2 VFM1 OSC p_ shift[...]

  • Seite 7

    3 R V5VH1 ×× /R V5VH2 ×× PIN CONFIGURA TION 1 2 3 4 8 7 6 5 • 8 pin SSOP (0.65mm pitch) PIN DESCRIPTION • RV5VH1 ×× Pin No. Symbol Description 1 CSW Control switch for DC/DC2 2 V SEN Sensing Pin for Voltage Detector 3 V OUT1 Output for DC/DC1, Power supply for the device 4 L X1 Output for DC/DC1, switching (Nch Open-Drain) 5 GND Ground 6 [...]

  • Seite 8

    R V5VH1 ×× /R V5VH2 ×× 4 ABSOLUTE MAXIMUM RA TINGS • RV5VH1 ×× Symbol Item Ratings Unit V OUT1 V OUT1 Pin Voltage 12 V V LX1 L X1 Pin Voltage 12 V V SEN V SEN Pin Voltage 12 V D OUT D OUT Pin Voltage 12 V V CSW CSW Pin Voltage –0.3 to V OUT1 +0.3 V V EXT2 EXT2 Pin Voltage –0.3 to V OUT1 +0.3 V V FB FB Pin Voltage –0.3 to V OUT1 +0.3 V[...]

  • Seite 9

    5 R V5VH1 ×× /R V5VH2 ×× ABSOLUTE MAXIMUM RATINGS Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation or permanent damage to the devi[...]

  • Seite 10

    R V5VH1 ×× /R V5VH2 ×× 6 ELECTRICAL CHARA CTERISTICS • RV5VH101 DC/DC Converter 1 * ) V IN =1.2V, I OUT =10mA, Topt=25˚C, unless otherwise specified. (See Typical Application) * 1 ) This value only shows the supply current of DC/DC1, not include the supply current of Voltage Detector and external resisto rs. Symbol Item Conditions MIN. TYP. [...]

  • Seite 11

    7 R V5VH1 ×× /R V5VH2 ×× DC/DC Converter 2 Symbol Item Conditions MIN. TYP. MAX. Unit V SET Set Output Voltage * 1 0 V V FB Feed Back Voltage –20 0 20 mV V IN Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage I OUT =1mA 1.8 V I SS2 Supply Current2 CSW= “H” at No Load 10 µA Istandby Standby Current CSW=“L” 0.3 µA I EXT2H[...]

  • Seite 12

    R V5VH1 ×× /R V5VH2 ×× 8 Symbol Item Conditions MIN. TYP. MAX. Unit V DET Detector Threshold 2.633 2.700 2.767 V V HYS Detector Threshold Hysteresis 0.081 0.135 0.189 V I SS3 Supply Current3 1.2 µA V IN max Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage 1.8 V I OUT Output Current V DS =0.5V, V OUT1 =1.5V 1.0 2.0 mA V DS =0.5V, [...]

  • Seite 13

    9 R V5VH1 ×× /R V5VH2 ×× • RV5VH102 DC/DC Converter 1 * ) V IN =1.2V, I OUT =10mA, Topt=25˚C, unless otherwise specified. (See Typical Application) * 1 ) This value only shows the supply current of DC/DC1, not include the supply current of Voltage Detector and external resisto rs. V OUT1 =5.0V, Topt=25˚C Symbol Item Conditions MIN. TYP. MAX[...]

  • Seite 14

    R V5VH1 ×× /R V5VH2 ×× 10 DC/DC Converter 2 V OUT1 =5.0V, Topt=25˚C Symbol Item Conditions MIN. TYP. MAX. Unit V SET Set Output Voltage * 1 –3.000 0 V V FB Feed Back Voltage 0 mV V IN Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage I OUT =1mA 1.8 V I SS2 Supply Current2 CSW= “H” at No Load 25 µA Istandby Standby Current C[...]

  • Seite 15

    11 R V5VH1 ×× /R V5VH2 ×× Voltage Detector V OUT1 =5.0V, Topt=25˚C Symbol Item Conditions MIN. TYP. MAX. Unit V DET Detector Threshold 4.388 4.500 4.612 V V HYS Detector Threshold Hysteresis 0.135 0.225 0.315 V I SS3 Supply Current3* 1 1.8 µA V IN max Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage* 2 1.8 V I OUT Output Current[...]

  • Seite 16

    R V5VH1 ×× /R V5VH2 ×× 12 Symbol Item Conditions MIN. TYP. MAX. Unit V OUT1 Step-up Output Voltage I OUT =0mA 2.925 3.000 3.075 V V IN max Maximum Input Voltage 10 V Vstart Oscillator Start-up Voltage No Load 0.7 0.8 V Vhold Hold-on Input Voltage I OUT =1mA 0.7 V I SS1 Supply Current1 * 1 I OUT =0mA, CSW=“L” 80 µA I EXT1H EXT1 “H” Outp[...]

  • Seite 17

    13 R V5VH1 ×× /R V5VH2 ×× Symbol Item Conditions MIN. TYP. MAX. Unit V SET Output Voltage Setting Range * 1 0 V V FB Feed Back Voltage –20 0 20 mV V IN Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage* 2 I OUT =1mA 1.8 V I SS2 Supply Current2* 3 CSW= “H” I OUT =0mA 10 µA Istandby Standby Current CSW=“L” 0.3 µA I EXT2H [...]

  • Seite 18

    R V5VH1 ×× /R V5VH2 ×× 14 Voltage Detector V OUT1 =3.0V, Topt=25˚C Symbol Item Conditions MIN. TYP. MAX. Unit V DET Detector Threshold 2.633 2.700 2.767 V V HYS Detector Threshold Hysteresis 0.081 0.135 0.189 V I SS3 Supply Current3* 1 1.2 µA V IN max Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage* 2 1.8 V I OUT Output Current[...]

  • Seite 19

    15 R V5VH1 ×× /R V5VH2 ×× • RV5VH202 DC/DC Converter 1 V OUT1 =5.0V, Topt=25˚C * ) V IN =3.0V, I OUT =10mA : unless otherwise specified. (See Typical Application) * 1 ) This value only shows the supply current of DC/DC1, does not include the supply current of Voltage Detector and external re sistors. Symbol Item Conditions MIN. TYP. MAX. Uni[...]

  • Seite 20

    R V5VH1 ×× /R V5VH2 ×× 16 DC/DC Converter 2 * ) V OUT1 =5.0V, V OUT2 =–3.0V, I OUT2 =1mA : unless otherwise specified. (See Typical Application) * 1 ) Adjustable by external resistors to -30V. * 2 ) “Minimum Operating Voltage”means a voltage for the “V OUT1 ” pin. * 3 ) This value shows only the supply current of DC/DC2, not include t[...]

  • Seite 21

    17 R V5VH1 ×× /R V5VH2 ×× Voltage Detector V OUT1 =5.0V, Topt=25˚C * ) V OUT1 =5.0V : unless otherwise specified. (See Typical Application) * 1 ) This value only shows the supply current of voltage detector. * 2 ) “Minimum Operating Voltage”means a voltage for the “V OUT1 ” pin. Symbol Item Conditions MIN. TYP. MAX. Unit V DET Detector[...]

  • Seite 22

    R V5VH1 ×× /R V5VH2 ×× 18 OPERA TION • DC/DC Converter 1 The DC/DC1 uses input voltage as an initial power supply, once boost operation is started the boost output will be used for the power supply of device itself. A change in the V OUT1 will feed back to the internal error amplifier through external volt- age setting resistors and internal [...]

  • Seite 23

    19 R V5VH1 ×× /R V5VH2 ×× C1 L FB V OUT2 V OUT1 EXT2 + – RV5VH1 ×× /RV5VH2 ×× Error Amp.2 VFM2 CSW 6 1 7 S B D + PMOS OSC C2 R2 R1 The DC/DC2 can operate by a voltage of “V OUT1 ”. A change in the V OUT2 will feed back to the internal error amplifier through external voltage setting resistors. The reference voltage should be provided [...]

  • Seite 24

    R V5VH1 ×× /R V5VH2 ×× 20 V SEN D OUT RV5VH1 ×× /RV5VH2 ×× Pull-up Output Tr. – + Vref Ra Rb Rc Tr.1 2 8 The VD can operate by the voltage of “V OUT1 ”. The detector threshold and the reset voltage are internally adjusted by trimmed resistors and the VD monitors V SEN pin voltage. The D OUT is Nch-opendrain output and a pull up resist[...]

  • Seite 25

    21 R V5VH1 ×× /R V5VH2 ×× OPERA TION OF STEP-UP DC/DC CONVER TER Step-up DC/DC Converter charges energy in the inductor when Lx Transistor (LxTr) is on, and discharges the energy with the addition of the energy from Input Power Source thereto, so that a higher output voltage than the input voltage is obtained. The operation will be explained wi[...]

  • Seite 26

    R V5VH1 ×× /R V5VH2 ×× 22 The above explanation is directed to the calculation in an ideal case where it is supposed that there is no energy loss in the external components and LxSW. In an actual case, the maximum output current will be 50 to 80% of the above calculated maximum output current. In particular, care must be taken because V IN is d[...]

  • Seite 27

    23 R V5VH1 ×× /R V5VH2 ×× <Components> Coils L1 : 27µH, L2 : 220µH Diodes Schottky type Capacitors C1 : 47µF(tantalum type), C2 : 22µF(tantalum type) C3 : 0.01µF(ceramic type) C4 : 0.01µF(ceramic type) PMOS 2SJ238(TOSHIBA), etc. NPN Tr. 2SD1628G(SANYO), etc. Resistors R1 : 100K Ω R2 : 0-500K Ω R3 : 100K Ω R4 : 300 Ω TYPICAL [...]

  • Seite 28

    R V5VH1 ×× /R V5VH2 ×× 24 TEST CIRCUITS CSW D OUT FB EXT2 L1=100 µ H,220 µ H GND V SEN V OUT1 L X1 L1 V 22 µ F A Fig.1 Test Circuit 1 CSW D OUT FB EXT2 GND V SEN V OUT1 L X1 (EXT1) 100k Ω 150 Ω A V V 5 Ω (150 Ω ) Oscilloscope * EXT1 * Fig.2 Test Circuit 2 CSW D OUT FB EXT2 GND V SEN V OUT1 L X1 A 0.5V Fig.3 Test Circuit 3[...]

  • Seite 29

    25 R V5VH1 ×× /R V5VH2 ×× Test Circuit 1: Typical Characteristics 1), 3), 5), 10), 11) Test Circuit 2: Typical Characteristics 6), 7), 8), 9), 13), 14), 15), 16), 17), 18), 19), 21) Test Circuit 3: Typical Characteristics 20) Test Circuit 4: Typical Characteristics 22) Test Circuit 5: Typical Characteristics 2), 4) Typical Application : Typical[...]

  • Seite 30

    R V5VH1 ×× /R V5VH2 ×× 26 TYPICAL CHARA CTERISTICS • DC/DC Converter 1 1) Output Voltage vs. Output Current (RV5VH1 ×× ) RV5VH101 3.6 3.4 3.2 2.8 3.0 2.4 2.6 2.2 2.0 Output Current I OUT (mA) Output Voltage V OUT1 (V) 0 20 40 60 80 100 140 120 V IN =0.9V V IN =1.2V V IN =1.5V V IN =2.0V Topt=25˚ C L1=100 µ H C1=22 µ F RV5VH101 3.6 3.4 3.[...]

  • Seite 31

    27 R V5VH1 ×× /R V5VH2 ×× 3) Efficiency vs. Output Current (RV5VH1 ×× ) RV5VH101 100 75 80 85 90 95 65 70 55 60 50 Output Current I OUT (mA) Efficiency η (%) 0.01 0.1 1 10 100 Topt=25˚ C L1=100 µ H C1=22 µ F V IN =0.9V V IN =1.2V V IN =2.0V V IN =1.5V RV5VH101 100 75 80 85 90 95 65 70 55 60 50 Output Current I OUT (mA) Efficiency η (%) 0[...]

  • Seite 32

    R V5VH1 ×× /R V5VH2 ×× 28 5) DC/DC1 Output Voltage vs. Temperature RV5VH1 × × / 2 × × 3.3 3.0 3.2 3.1 2.9 2.8 2.7 Temperature Topt(˚ C) Output Voltage V OUT (V) –60 –40 –20 0 20 40 60 80 100 V IN =1.2V L1=100 µ H C1=22 µ F I OUT =10mA I OUT =5mA I OUT =0A RV5VH1 × × / 2 × × 5.3 5.0 5.2 5.1 4.9 4.8 4.7 Temperature Topt(˚ C) Out[...]

  • Seite 33

    29 R V5VH1 ×× /R V5VH2 ×× 8) On Resistance of LX vs. Supply Voltage RV5VH1 × × 5.0 4.0 4.5 2.5 3.0 2.0 3.5 0.0 1.5 1.0 0.5 Supply Voltage V OUT1 (V) On Resistance Ron ( Ω ) 0.0 1.0 2.0 3.0 4.0 5.0 6.0 85˚ C 25˚ C –40˚ C RV5VH201 18 12 10 8 16 14 0 6 4 2 Temperature Topt(˚ C) Output Current I OUT (mA) –60 –40 –20 0 20 40 60 80 10[...]

  • Seite 34

    R V5VH1 ×× /R V5VH2 ×× 30 12) Output Voltage vs. Output Current RV5VH101 0 –2 –4 –6 –14 –10 –12 –8 Output Current I OUT (mA) Output Voltage V OUT (V) 0 4 8 6 10 12 2 14 Topt=25˚ C V IN =1.2V V OUT1 =3V V SET –6V V SET –9V V SET –12V V SET –3V RV5VH1 × × / 2 × × 0.010 –0.010 –0.004 –0.002 0.000 0.002 0.004 0.006 [...]

  • Seite 35

    31 R V5VH1 ×× /R V5VH2 ×× 15) EXT2 Oscillator Frequency vs. Temperature RV5VH1 × × / 2 × × 150 100 115 120 125 130 135 140 145 110 105 Temperature Topt(˚ C) Oscillator Frequency fosc(kH Z ) –60 –40 –20 0 20 40 60 80 100 V OUT1 =3V RV5VH1 × × / 2 × × 150 100 115 120 125 130 135 140 145 110 105 Temperature Topt(˚ C) Oscillator Fre[...]

  • Seite 36

    R V5VH1 ×× /R V5VH2 ×× 32 18) Detector Threshold Voltage vs. Temperature RV5VH1 × × / 2 × × 3.0 2.5 2.7 2.8 2.9 2.6 Temperature Topt(˚ C) Detector Threshold Voltage V DET (V) –60 –40 –20 0 20 40 60 80 100 +V DET –V DET RV5VH1 × × / 2 × × 5.0 4.5 0.0 2.0 1.5 3.0 2.5 4.0 3.5 1.0 0.5 V OUT1 Output Voltage V OUT1 (V) Output Current[...]

  • Seite 37

    33 BLOCK DIA GRAM + – + – CSW FB1 V DD EXT1 D OUT FB2 EXT2 GND Vref Error Amp.1 Error Amp.2 1 2 3 4 8 7 6 5 VFM2 VFM1 OSC p_ shift + – DC/DC CONVER TER CONTROLLER (BOOST / INVER TING OUTPUT FOR LCD) R V5VH3 × × PIN CONFIGURA TION 1 2 3 4 8 7 6 5 • 8 pin SSOP (0.65mm pitch)[...]

  • Seite 38

    R V5VH3 ×× 34 PIN DESCRIPTION ABSOLUTE MAXIMUM RATINGS Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation above these absolute maximum ratings may cause degradation or permanent damage to the d[...]

  • Seite 39

    35 R V5VH3 ×× Symbol Item Conditions MIN. TYP. MAX. Unit V SET1 Output Voltage Setting 1 2.05 * 1 V V FB1 Feed Back Volatage 1 1.950 2.000 2.050 V V IN max Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage Specified as a V DD 1.8 V Voltage for Device Operation I SS11 Supply Current11* 2 CSW=“H”, FB1=1.9V 15 60 µA I SS12 Supply C[...]

  • Seite 40

    R V5VH3 ×× 36 DC/DC Converter 2 Symbol Item Conditions MIN. TYP. MAX. Unit V SET2 Output Voltage Setting 1 * 1 0 V V FB2 Feed Back Volatage 1 –20 0 20 mV V IN max Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage Specified as the V DD 1.8 V Voltage for Device Operation I SS21 Supply Current21* 2 CSW=“H”, FB2=0.1V 15 60 µA I SS[...]

  • Seite 41

    37 R V5VH3 ×× Voltage Detector Symbol Item Conditions MIN. TYP. MAX. Unit V DET Detector Threshold 2.633 2.700 2.767 V V HYS Detector Threshold Hysteresis 0.081 0.135 0.189 V I SS3 Supply Current3* 1 1.2 µA V IN max Maximum Input Voltage 10 V V OPT min Minimum Operating Voltage Specified as the V DD 1.8 V Voltage for Device Operation I OUT Outpu[...]

  • Seite 42

    R V5VH3 ×× 38 OPERA TION • DC/DC Converter 1 The DC/DC1 can operate by an input voltage to the V DD pin. A change in the V OUT1 will feed back to the internal error amplifier through external voltage setting resistors and internal feed back resistors. When the feed back voltage is lower than the reference voltage the error amplifier enables osc[...]

  • Seite 43

    39 R V5VH3 ×× • DC/DC Converter 2 The DC/DC2 can operate by an input voltage to the V DD pin. A change in the V OUT2 will feed back to the internal error amplifier through external voltage setting resistors. The V REF voltage should be provided from externally fixed power sup- ply such as V OUT1 . When the feed back voltage to the Error Amp.2 i[...]

  • Seite 44

    R V5VH3 ×× 40 D OUT RV5VH3 ×× Pull-up Output Tr. – + Vref R1 R2 R3 Tr.1 3 8 V DD The Voltage Detector can operate by an input voltage to the V DD pin. The detector threshold and the reset voltage are internally adjusted by trimmed resistors and the VD monitors V DD pin voltage. The D OUT is Nch-opendrain output and a pull up resistor is neces[...]

  • Seite 45

    41 R V5VH3 ×× TYPICAL APPLICA TION 1 CSW FB1 V DD EXT1 D OUT FB2 EXT2 GND Output DC/DC 2 Output DC/DC 1 C2 L2 PMOS R3 R1 R2 C3 SBD C1 NPN Tr. SBD R6 R4 C4 R5 C5 L1 CoiI L1 : 100µH, L2 : 100µH Diode Schottky type capacitor C1 : 22µF(Ta), C2 : 22µF(Ta) C3 : 0.01µF (ceramic) C4 : 0.01µF (ceramic) C5 : 0.01µF (ceramic) PMOS 2SJ238 (TOSHIBA) NM[...]

  • Seite 46

    R V5VH3 ×× 42 CSW FB1 V DD EXT1 D OUT FB2 EXT2 GND C2 L2 PMOS R3 R1 V IN R2 C3 SBD C1 NPN Tr. SBD R6 R4 C4 R5 C5 L1 Output DC/DC 2 Output DC/DC 1 TYPICAL APPLICA TION 2 CoiI L1 : 100µH, L2 : 100µH Diode Schottky type capacitor C1 : 22µF(Ta), C2 : 22µF(Ta) C3 : 0.01µF (ceramic) C4 : 0.01µF (ceramic) C5 : 0.01µF (ceramic) PMOS 2SJ238 (TOSHIB[...]

  • Seite 47

    43 R V5VH3 ×× CSW FB1 V DD EXT1 D OUT FB2 EXT2 GND C2 L2 R3 R1 R2 C3 SBD3 C1 PNP Tr. SBD1 R6 R5 C5 L1 R4 C4 NMOS PMOS V IN SBD2 Output DC/DC 2 Output DC/DC 1 R1 : 820k Ω , R2 : 820k Ω , R3 : 100k Ω , R4 : 1k Ω , R5 : 750k Ω (AdjustabIe) R6 : 100k Ω L1 : 68µH, L2 : 27µH C1 : 22µF, C2 : 22µF, C3 : 1000pF, C4 : 2200pF, C5 : 1000pF PM[...]

  • Seite 48

    R V5VH3 ×× 44 TYPICAL CHARA CTERISTICS 1) Output Voltage vs. Output Current 25 15 10 5 –5 –15 –20 –10 20 0 –25 Output Current I OUT (mA) Output Voltage V OUT (V) 0 10 20 V IN =3.6V 100 90 80 70 60 50 40 30 20 Output Current I OUT (A) Efficiency η (%) 0.0001 0.001 0.01 0.1 V IN =3.6V ± 20V ± 15V ± 10V V OUT ± 5.0V 2) Efficiency vs. [...]

  • Seite 49

    45 R V5VH3 ×× SELECTION GUIDE The output voltage, the type of DC/DC1 and the taping type for the ICs can be selected at the user's request. The selection can be made by designating the part number as shown below: RV5VH × × × – × × ← Part Number ↑ ↑ ↑ a b c } } Code Contents DC/DC1 type a 1 : Internal L X Driver Transister Type[...]

  • Seite 50

    R V5VH3 ×× 46 P A CKA GE DIMENSIONS (Unit : mm) T APING SPECIFICA TION (Unit : mm) • 8 pin SSOP (0.65mm pitch) 0.575 TYP. 3.1 ± 0.3 6.4 ± 0.3 4.4 ± 0.2 0.22 ± 0.1 0.5 ± 0.3 1.15 ± 0.1 0.1 ± 0.1 0.65 0.15 0.15 M 0.15 +0.1 –0.05 User Direction of Feed E1 E2 2.7MAX. 0.3 ± 0.1 4.0 ± 0.1 2.0 ± 0.05 8.0 ± 0.1 3.7 6.9 ø1.5 +0.1 –0 5.5 [...]

  • Seite 51

    47 R V5VH3 ×× APPLICATION HINTS When using these ICs, be sure to take care of the following points. • Set external components as close as possible to the IC and minimize the connection between the components and the IC. In particular, when an external component is connected to VOUT Pin, make minimum connection with the capacitor. • Make suffi[...]

  • Seite 52

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