Ricoh RH5RH12B Applications Manual Download Page 1 | Manualshive

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ELECTRONIC DEVICES DIVISION

PWM STEP-UP DC/DC CONVERTER

RH5RH

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1A/

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2B/

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3B SERIES

APPLICATION MANUAL

NO.EA-023-9803

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Summary of Contents for RH5RH12B

Page 1: ...ELECTRONIC DEVICES DIVISION PWM STEP UP DC DC CONVERTER RH5RH 1A 2B 3B SERIES APPLICATION MANUAL NO EA 023 9803...

Page 2: ...ent computer equipment measuring instruments consumer electronic products amusement equipment etc Those customers intending to use a product in an application requiring extreme quality and reliability...

Page 3: ...t 25 C 16 6 Output Voltage vs Temperature 17 7 Start up Voltage vs Temperature 18 8 Hold on Voltage vs Temperature 18 9 Supply Current 1 vs Temperature 18 10 Supply Current 2 vs Temperature 18 11 Lx S...

Page 4: ...23 RH5RH 1A 23 RH5RH 2B 23 RH5RH 3B 24 CE pin Drive Circuit 22 APPLICATION CIRCUITS 26 12V Step up Circuit 26 Step down Circuit 26 Step up Step down Circuit with Flyback 27 PACKAGE DIMENSIONS 28 TAPI...

Page 5: ...o vided with a drive pin EXT for an external transistor Because of the use of the drive pin EXT an external transistor with a low saturation voltage can be used so that a large current can be caused t...

Page 6: ...Tr Driver Oscillator Frequency 100kHz 3B Internal Tr External Tr selectively available Oscillator Frequency 100kHz with chip enable function Designation of Taping Type c Ex SOT 89 T1 T2 SOT 89 5 T1 T...

Page 7: ...B 2B 3B 1 1 5 2 2 2 3 4 3 3 1 1 2 3 mark side 1 2 3 mark side 5 4 RH5RH Symbol Description VSS Ground Pin OUT Step up Output Pin Power Supply for device itself Lx Switching Pin Nch Open Drain EXT Exte...

Page 8: ...mA Note2 500 mW 30 to 80 C 55 to 125 C 260 C 10s Note 1 Applicable to RH5RH 1A and RH5RH 3B Note 2 Applicable to RH5RH 2B and RH5RH 3B Note 3 Applicable to RH5RH 3B Vss 0V Absolute Maximum ratings are...

Page 9: ...0 8 1 0 V Note2 VOUT 3 0V RH5RH Unless otherwise provided VIN 1 8V VSS 0V IOUT 10mA Topt 25 C and use External Circuit of Typical Application FIG 1 Note 1 Soft Start Circuit is operated in the follow...

Page 10: ...Note 2 ILX is gradually increased after Lx Switch is turned ON In accordance with the increase of ILX VLX is also increased When VLX reaches VLXlim Lx Switch is turned OFF by an Lx Switch Protection...

Page 11: ...ed VIN 1 8V Vss 0V IOUT 10mA Topt 25 C and use External Circuit of Typical Application FIG 2 RH5RH502B VOUT 5 0V Unless otherwise provided VIN 3V Vss 0V IOUT 10mA Topt 25 C and use External Circuit of...

Page 12: ...A 80 100 120 kHz on VLX L side 70 80 90 Time required for the rising 0 5 2 0 ms Note1 of VOUT up to 3V Lx Switch ON 0 65 0 8 1 0 V Note2 VOUT 3 0V Unless otherwise provided VIN 1 8V VSS 0V IOUT 10mA...

Page 13: ...eaches VLXlim Lx Switch is turned OFF by an Lx Switch Protection Circuit Symbol Item VOUT Output Voltage VIN Input Voltage Vstart Start up Voltage Vhold Hold on Voltage Efficiency IDD1 Supply Current...

Page 14: ...s ILmin 0 after a time period of topen so that SD is turned OFF However in the case of a continuous mode which will be mentioned later the time period toff runs out before IL reaches ILmin 0 so that L...

Page 15: ...ode is the continuous mode Output Current in Discontinuous Mode In the discontinuous mode when LxTr is on the energy PON charged in the inductor is provided by Equation 3 as follows PON 0 ton VIN IL t...

Page 16: ...d ILmin and the smaller the value of ILmax Therefore when the load current is the same the larger the value of L the easier the selection of peripheral components with a small allowable current become...

Page 17: ...0V RH5RH501A L 120 H VIN 1 0V Output Current IOUT mA Output Voltage V OUT V 3 0V 4 0V 0 50 100 150 4 0 4 2 4 4 4 6 4 8 5 0 5 2 2 0V RH5RH302B L 28 H Output Current IOUT mA Output Voltage V OUT V 2 5V...

Page 18: ...RH501A L 120 H VIN 1 0V 3 0V 4 0V 0 50 100 150 90 100 80 70 60 50 40 Output Current IOUT mA Efficiency 2 0V RH5RH302B L 28 H VIN 0 9V 2 0V 2 5V 0 200 400 600 80 100 60 40 20 0 Output Current IOUT mA E...

Page 19: ...A RH5RH501A L 120 H 1 2 3 4 200 150 100 50 0 Input Voltage VIN V Supply Current I IN A RH5RH301A L 120 H 1 5 10 20 30 40 50 60 70 80 90 100 50 60 70 80 40 30 20 10 0 Output Current IOUT mA Ripple Vol...

Page 20: ...RH302B L 28 H 1 50 100 150 200 50 60 70 40 30 20 10 0 Output Current IOUT mA Ripple Voltage Vr mV p p VIN 0 9V 2 0V 3 0V RH5RH301A L 120 H 0 10 20 30 1 0 1 2 1 4 0 8 0 6 0 4 0 2 0 Output Current IOUT...

Page 21: ...ld RH5RH301A IOUT 10mA VIN 2V L 120 H 40 20 0 20 40 60 80 100 3 1 3 0 3 2 2 9 2 8 2 7 Temperature Topt C Output Voltage V OUT V RH5RH302B IOUT 10mA VIN 2V L 28 H 3 1 3 2 3 0 2 9 2 8 2 7 40 20 0 20 40...

Page 22: ...pply Current 1 I DD1 A RH5RH501A 40 20 0 20 40 60 80 Temperature Topt C 100 125 150 75 50 25 0 Lx Switching Current I LX mA RH5RH501A RH5RH501A 40 20 0 20 40 60 80 Temperature Topt C 4 5 3 2 1 0 Suppl...

Page 23: ...0 100 40 30 20 10 0 RH5RH302B IOUT 10mA VIN 2V L 28 H 40 20 0 20 40 60 80 100 Temperature Topt C Oscillator Frequency fosc kHz 60 80 100 120 140 40 20 0 RH5RH301A IOUT 10mA VIN 2V L 120 H 40 20 0 20 4...

Page 24: ...Oscillator Duty Cycle Maxdty 70 80 90 100 60 50 RH5RH501A 40 20 0 20 40 60 80 Temperature Topt C V LX Voltage Limit V LXlim V 0 4 0 6 0 8 1 0 1 2 0 2 0 0 RH5RH501A 40 20 0 20 40 60 80 Temperature Top...

Page 25: ...3 5 3 0 Output Voltage V OUT V 150 180 210 240 120 90 60 30 0 Output Current I OUT mA Output Voltage Output Current RH5RH302B IOUT 1mA 30mA VIN 2V L 28 H 0 20 40 60 80 Time t ms 3 0 3 5 4 0 4 5 5 0 2...

Page 26: ...5 04 5 06 5 02 5 04 5 00 5 02 4 98 5 00 4 96 4 98 4 94 4 96 4 92 4 94 4 90 4 92 4 88 4 90 4 86 4 88 4 84 4 86 4 82 4 84 4 80 4 82 RH5RH501A 20 Distribution of Oscillator Frequency 0 5 10 15 20 25 Dis...

Page 27: ...tsushita Electronics Corporation Schottky Type Capacitor CL 22 F Tantalum Type FIG 1 VIN Inductor Diode OUT Vss VOUT Capacitor Cb Rb Tr EXT Components Inductor L 28 H Troidal Core Diode D HRP22 Hitach...

Page 28: ...ita Electronics Corporation Schottky Type Capacitor CL 22 F Tantalum Type FIG 3 VIN Inductor Diode Lx OUT Vss VOUT Capacitor Cb Rb Tr EXT CE NC Components Inductor L 28 H Troidal Core Diode D HRP22 Hi...

Page 29: ...25 VIN Inductor Diode Lx OUT Vss VOUT Capacitor EXT CE NC RH5RH 3B Pull up resistor Tr CE RH5RH CE pin Drive Circuit FIG 5...

Page 30: ...le use the Rzd for flowing the bias current through the Zener diode ZD FIG 6 VIN Inductor Diode OUT Vss VOUT Capacitor RH5RH 1A Tr PNP Lx Rb1 Rb2 Starter Circuit Note When the LX pin Voltage is over t...

Page 31: ...ide VOUT side VIN side VIN side Starter Circuit Starter Circuit ZDst 2 5V ZDst Designation of Output Voltage Rst Input Bias Current of ZDst and Tr several k to several hundreds k Step up Step down Cir...

Page 32: ...8 1 0 1 2 3 0 42 0 47 0 42 4 5 0 1 1 5 0 1 0 4 0 1 0 4 0 1 1 6 0 2 1 5 0 1 1 5 0 1 0 1 0 1 0 1 2 5 0 1 0 42 0 1 1 0 5 4 1 2 3 0 4 0 9 MIN 0 5 0 3 4 5 0 42 0 47 0 42 User Direction of Feed T 1 T 2 8 0...

Page 33: ...ith a soft start circuit However there may be the case where the overshoot of the out put voltage takes place depending upon the peripheral circuits employed and the input output condi tions In partic...

Page 34: ...53 6011 YOKOHAMA OFFICE International Sales 3 2 3 Shin Yokohama Kohoku ku Yokohama City Kanagawa 222 8530 JAPAN Phone 81 45 477 1697 Fax 81 45 477 1694 1695 http www ricoh co jp LSI english RICOH CORP...

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