Summary of Contents for Ricoh RH5RH12B
- Page 1 PWM STEP-UP DC/DC CONVERTER RH5RH 3B SERIES APPLICATION MANUAL ELECTRONIC DEVICES DIVISION NO.EA-023-9803...
- Page 2 The release of such information is not to be construed as a warranty of or a grant of license under Ricoh's or any third party's intellectual property rights or any other rights. 5. The products listed in this document are intended and designed for use as general electronic components in standard applications (office equipment, computer equipment, measuring instruments, consumer electronic products, amusement equipment etc.).
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Page 3: Table Of Contents
RH5RH SERIES APPLICATION MANUAL CONTENTS OUTLINE FEATURES APPLICATIONS BLOCK DIAGRAM SELECTION GUIDE PIN CONFIGURATION PIN DESCRIPTION ABSOLUTE MAXIMUM RATINGS ELECTRICAL CHARACTERITICS OPERATION OF STEP-UP DC/DC CONVERTER TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current 2) Efficiency vs. Output Current 3) Supply Current (No Load) vs. Input Voltage 4) Output Current vs. - Page 4 TYPICAL APPLICATIONS • RH5RH • RH5RH • RH5RH • CE pin Drive Circuit APPLICATION CIRCUITS • 12V Step-up Circuit • Step-down Circuit • Step-up/Step-down Circuit with Flyback PACKAGE DIMENSIONS TAPING SPECIFICATIONS...
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Page 5: Outline
RH5RH OUTLINE The RH5RH 3B Series are PWM Step-up DC/DC converter ICs by CMOS process. The RH5RH 1A IC consists of an oscillator, a PWM control circuit, a driver transistor (Lx switch), a refer- ence voltage unit, an error amplifier, a phase compensation circuit, resistors for voltage detection, a soft-start cir- cuit, and an Lx switch protection circuit. -
Page 6: Block Diagram
RH5RH BLOCK DIAGRAM Error Amp. (Error Amplifier) has a DC gain of 80dB, and Phase Comp. (Phase Compensation Circuit) provides the frequency characteristics including the 1st pole (fp=0.25Hz) and the zero point (fz=2.5kHz). Furthermore, another zero point (fz=1.0kHz) is also obtained by the resistors and a capacitor connected to the OUT pin. -
Page 7: Pin Configuration
PIN DESCRIPTION Pin No. — — — — • Symbol Ground Pin Step-up Output Pin, Power Supply (for device itself) Switching Pin (Nch Open Drain) External Tr. Drive Pin (CMOS Output) Chip Enable Pin (Active Low) RH5RH SOT-89-5 (mark side) Description... -
Page 8: Absolute Maximum Ratings
RH5RH ABSOLUTE MAXIMUM RATINGS Symbol Output Pin Voltage Lx Pin Voltage EXT Pin Voltage CE Pin Voltage Lx Pin Output Current EXT Pin Current Power Dissipation Topt Operating Temperature Range Tstg Storage Temperature Range Tsolder Lead Temperature(Soldering) (Note 1) Applicable to RH5RH 1A and RH5RH (Note 3) Applicable to RH5RH Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any... -
Page 9: Electrical Characteritics
ELECTRICAL CHARACTERISTICS • RH5RH301A Symbol Item Output Voltage Input Voltage Vstart Start-up Voltage Vhold Hold-on Voltage Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current LX leak fosc Oscillator Frequency Oscillator Maximum Duty Maxdty Cycle Efficiency start Soft-Start Time Voltage Limit Unless otherwise provided, V... - Page 10 RH5RH • RH5RH501A Symbol Item Output Voltage Input Voltage Vstart Start-up Voltage Vhold Hold-on Voltage Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current LX leak fosc Oscillator Frequency Oscillator Maximum Duty Maxdty Cycle Efficiency start Soft-Start Time Voltage Limit Unless otherwise provided, V Application (FIG.
- Page 11 • RH5RH302B Symbol Item Output Voltage Input Voltage Vstart Oscillator Start-up Voltage Supply Current 1 Supply Current 2 EXT “H” Output Current EXTH EXT “L” Output Current EXTL fosc Oscillator Frequency Oscillator Maximum Duty Maxdty Cycle start Soft-Start Time Unless otherwise provided, V =1.8V, Vss=0V, I Application (FIG.
- Page 12 RH5RH • RH5RH303B Symbol Item Output Voltage Input Voltage Vstart Start-up Voltage Vhold Hold-on Voltage Efficiency Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current LX leak EXT “H” Output Current EXTH EXT “L” Output Current EXTL CE “H”...
- Page 13 • RH5RH503B Symbol Item Output Voltage Input Voltage Vstart Start-up Voltage Vhold Hold-on Voltage Efficiency Supply Current 1 Supply Current 2 Lx Switching Current Lx Leakage Current LX leak EXT “H” Output Current EXTH EXT “L” Output Current EXTL CE “H” Level 1 CE “L”...
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Page 14: Operation Of Step-Up Dc/Dc Converter
RH5RH OPERATION OF STEP-UP DC/DC CONVERTER 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. - Page 15 When the output current (I ) is relatively small, topen<toff as illustrated in the above diagram. In this case, the energy charged in the inductor during the time period of ton is discharged in its entirely during the time peri- od of toff, so that ILmin becomes zero (ILmin=0).
- Page 16 RH5RH Therefore it is necessary that the setting of the input/output conditions and the selection of peripheral compo- nents should be made with ILmax taken into consideration. Output Current in Continuous Conduction Mode • When the operation enters into the continuous conduction mode by increasing the I to Iconst (>...
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Page 17: Typical Characteristics
TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current RH5RH301A 1.5V =1.0V Output Current I RH5RH501A 2.0V 3.0V 1.0V Output Current I RH5RH302B 2.0V 1.5V =0.9V Output Current I L=120µH 2.0V (mA) L=120µH 4.0V (mA) L=28µH 2.5V (mA) RH5RH RH5RH301A L= 270µH 1.5V =1.0V 2.0V... -
Page 18: Efficiency Vs. Output Current
RH5RH 2) Efficiency vs. Output Current RH5RH301A =1.0V Output Current I RH5RH501A 3.0V 2.0V =1.0V Output Current I RH5RH302B 1.5V =0.9V Output Current I L=120µH 2.0V 1.5V (mA) L=120µH 4.0V (mA) L = 28µH 2.5V 2.0V (mA) RH5RH301A L=270µH 2.0V =1.0V 1.5V Output Current I... -
Page 19: Supply Current (No Load) Vs. Input Voltage
3) Supply Curret (No Load) vs. Input Voltage RH5RH301A Input Voltage V RH5RH501A Input Voltage V 4) Output Current vs.Ripple Voltage RH5RH301A 2.0V =0.9V 5 10 20 30 40 50 60 70 80 90 100 Output Current I L=120µH L=120µH L=120µH 3.0V =0.9V... -
Page 20: Start-Up/Hold-On Voltage Vs. Output Current (Topt=25˚C)
RH5RH RH5RH301A =0.9V 2.0V Output Current I RH5RH302B =0.9V Output Current I 5) Start-up/Hold-on Voltage vs. Output Current (Topt=25˚C) RH5RH301A Vstart Vhold Output Current I L=270µH 3.0V (mA) L=28µH 2.0V 3.0V (mA) L=120µH (mA) RH5RH501A L=270µH 4.0V 3.0V 2.0V =0.9V Output Current I (mA) RH5RH502B... -
Page 21: Output Voltage Vs.temperature
RH5RH302B Vstart Vhold Output Current I 6) Output Voltage vs.Temperature RH5RH301A –40 –20 Temperature Topt(˚C) RH5RH302B –40 –20 Temperature Topt(˚C) L=28µH Vstart Vhold (mA) =10mA L=120µH –40 –20 =10mA L=28µH –40 –20 RH5RH RH5RH502B L=28µH Output Current I (mA) =10mA RH5RH501A L=120µH Temperature Topt(˚C) -
Page 22: Start-Up Voltage Vs. Temperature
RH5RH 7) Start-up Voltage vs. Temperature RH5RH501A –40 –20 Temperature Topt(˚C) 9) Supply Current 1 vs.Temperature RH5RH501A –40 –20 Temperature Topt(˚C) 11) Lx Switching Current vs.Temperature RH5RH501A –40 –20 Temperature Topt(˚C) 8) Hold-on Voltage vs. Temperature –40 10) Supply Current 2 vs.Temperature –40 12) Lx Leakage Current vs.Temperature –40... -
Page 23: Oscillator Frequency Vs. Temperature
13) Oscillator Frequency vs. Temperature RH5RH301A –20 –40 Temperature Topt(˚C) RH5RH302B –40 –20 Temperature Topt(˚C) 14) Oscillator Duty Cycle vs. Temperature RH5RH301A –40 –20 Temperature Topt(˚C) =10mA L=120µH –40 –20 =10mA L=28µH –40 –20 =10mA L=120µH –40 –20 RH5RH =10mA RH5RH501A L=120µH Temperature Topt(˚C) -
Page 24: Vlx Voltage Limit Vs. Temperature
RH5RH RH5RH302B –40 –20 Temperature Topt(˚C) 15) V Voltage Limit vs. Temperature RH5RH501A –40 –20 Temperature Topt(˚C) 16) EXT “H” Output Current vs. Temperature RH5RH501A –40 –20 Temperature Topt(˚C) =10mA L=28µH –40 17) EXT “L” Output Current vs. Temperature –40 RH5RH502B L=28µH –20... -
Page 25: Load Transient Response
18) Load Transient Response RH5RH301A L=120µH Output Voltage Output Voltage Output Current Time t(ms) RH5RH302B L=28µH Output Voltage Output Current Time t(ms) =1mA-30mA =1mA-30mA RH5RH RH5RH501A =1mA-30mA L=120µH Output Voltage Output Current Time t(ms) RH5RH502B =1mA-30mA L=28µH Output Voltage Output Current Time t(ms) -
Page 26: Distribution Of Output Voltage
RH5RH 19) Distribution of Output Voltage 5.18~5.20 5.16~5.18 5.14~5.16 5.12~5.14 5.10~5.12 5.08~5.10 5.06~5.08 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 20) Distribution of Oscillator Frequency 59~60 58~59 57~58 56~57 55~56 54~55 53~54 52~53 51~52 50~51 49~50 48~49... -
Page 27: Typical Applications
TYPICAL APPLICATIONS • RH5RH Components Inductor (L) Diode (D) Capacitor (C • RH5RH Inductor Components Inductor (L) Diode (D) Capacitor (C Transistor (Tr) Base Resistor (Rb) Base Capacitor (Cb) : 0.01µF Diode Inductor : 120µH (Sumida Electric Co., Ltd.) : MA721 (Matsushita Electronics Corporation, Schottky Type) : 22µF (Tantalum Type) FIG. -
Page 28: Rh5Rh 3B
RH5RH RH5RH • Components Inductor (L) Diode (D) Capacitor (C Inductor Components Inductor (L) Diode (D) Capacitor (C Transistor (Tr) Base Resistor (Rb) Base Capacitor (Cb) : 0.01µF Diode Inductor : 120µH (Sumida Electric Co., Ltd.) : MA721 (Matsushita Electronics Corporation, Schottky Type) : 22µF (Tantalum Type) FIG. -
Page 29: Ce Pin Drive Circuit
• CE pin Drive Circuit Inductor Diode RH5RH FIG. 5 RH5RH Pull-up resistor Capacitor... -
Page 30: Application Circuits
RH5RH APPLICATION CIRCUITS • 12V Step-up Circuit Inductor (Note) When the Output Current is small or the Output Voltage is unstable,use the Rzd for flowing the bias current through the Zener diode ZD. • Step-down Circuit (Note) When the L pin Voltage is over the rating at the time PNP Tr is OFF,use a RH5RH Diode RH5RH502B... -
Page 31: Step-Up/Step-Down Circuit With Flyback
• Step-up/Step-down Circuit with Flyback Trance1:1 (Note) Use a RH5RH 2B,depend on the Output Current. * The Starter Circuit is necessary for all above circuits. 1.for Step-up Circuit. Starter Circuit 2.for Step-down and Step-up/Step-down Circuit. Starter Circuit Diode RH5RH Starter Circuit FIG. -
Page 32: Package Dimensions
RH5RH PACKAGE DIMENSIONS • SOT-89 4.5±0.1 1.6±0.2 ø1.0 0.42 0.4 7 0.42 ±0.1 ±0.1 ±0.1 1.5±0.1 1.5±0.1 TAPING SPECIFICATIONS • SOT-89 0.3±0.1 2.5MAX. • SOT-89-5 0.3±0.1 2.5MAX. (Unit: mm) • SOT-89-5 1.5±0.1 0.4±0.1 0.4±0.1 1.5 0.1 (Unit: mm) +0.1 ø 4.0±0.1 –0 2.0±0.05... - Page 33 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 OUT Pin, make minimum connection with the capacitor.
- Page 34 RICOH COMPANY, LTD. ELECTRONIC DEVICES DIVISION HEADQUARTERS 13-1, Himemuro-cho, Ikeda City, Osaka 563-8501, JAPAN Phone 81-727-53-1111 Fax 81-727-53-6011 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 CORPORATION ELECTRONIC DEVICES DIVISION SAN JOSE OFFICE 3001 Orchard Parkway, San Jose, CA 95134-2088, U.S.A.