 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| MC34063A, MC33063A DC-to-DC Converter Control Circuits The MC34063A Series is a monolithic control circuit containing the primary functions required for DC-to-DC converters. These devices consist of an internal temperature compensated reference, comparator, controlled duty cycle oscillator with an active current limit circuit, driver and high current output switch. This series was specifically designed to be incorporated in Step-Down and Step-Up and Voltage-Inverting applications with a minimum number of external components. Refer to Application Notes AN920A/D and AN954/D for additional design information. http://onsemi.com 8 1 PDIP-8 P, P1 SUFFIX CASE 626 * * * * * * * Operation from 3.0 V to 40 V Input Low Standby Current Current Limiting Output Switch Current to 1.5 A Output Voltage Adjustable Frequency Operation to 100 kHz Precision 2% Reference 8 1 SO-8 D SUFFIX CASE 751 8 1 SOEIAJ-8 M SUFFIX CASE 968 PIN CONNECTIONS Switch Collector Switch Emitter Driver Collector Ipk Sense VCC Comparator Inverting Input 1 2 3 4 (Top View) 8 7 6 5 Representative Schematic Diagram Drive 8 Collector SQ Ipk 7 Sense R 100 Q2 Q1 2 Switch Emitter 1 Switch Collector Timing Capacitor Gnd ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 11 of this data sheet. Ipk Oscillator CT VCC 6 Comparator + Comparator 5 Inverting Input 1.25 V Reference Regulator 4 (Bottom View) 3 Timing Capacitor DEVICE MARKING INFORMATION See general marking information in the device marking section on page 11 of this data sheet. Gnd This device contains 51 active transistors. (c) Semiconductor Components Industries, LLC, 2000 1 August, 2000 - Rev. 6 Publication Order Number: MC34063A/D MC34063A, MC33063A MAXIMUM RATINGS Rating Power Supply Voltage Comparator Input Voltage Range Switch Collector Voltage Switch Emitter Voltage (VPin 1 = 40 V) Switch Collector to Emitter Voltage Driver Collector Voltage Driver Collector Current (Note 1.) Switch Current Power Dissipation and Thermal Characteristics Plastic Package, P, P1 Suffix TA = 25C Thermal Resistance SOIC Package, D Suffix TA = 25C Thermal Resistance Operating Junction Temperature Operating Ambient Temperature Range MC34063A MC33063AV MC33063A Storage Temperature Range 1. Maximum package power dissipation limits must be observed. 2. ESD data available upon request. Symbol VCC VIR VC(switch) VE(switch) VCE(switch) VC(driver) IC(driver) ISW Value 40 -0.3 to +40 40 40 40 40 100 1.5 Unit Vdc Vdc Vdc Vdc Vdc Vdc mA A PD RJA PD RJA TJ TA 1.25 100 625 160 +150 0 to +70 -40 to +125 -40 to +85 W C/W W C/W C C Tstg -65 to +150 C http://onsemi.com 2 MC34063A, MC33063A ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, TA = Tlow to Thigh [Note 3.], unless otherwise specified.) Characteristics OSCILLATOR Frequency (VPin 5 = 0 V, CT = 1.0 nF, TA = 25C) Charge Current (VCC = 5.0 V to 40 V, TA = 25C) Discharge Current (VCC = 5.0 V to 40 V, TA = 25C) Discharge to Charge Current Ratio (Pin 7 to VCC, TA = 25C) Current Limit Sense Voltage (Ichg = Idischg, TA = 25C) OUTPUT SWITCH (Note 4.) Saturation Voltage, Darlington Connection ( ISW = 1.0 A, Pins 1, 8 connected) Saturation Voltage (Note 5.) (ISW = 1.0 A, RPin 8 = 82 to VCC, Forced ] 20) DC Current Gain (ISW = 1.0 A, VCE = 5.0 V, TA = 25C) Collector Off-State Current (VCE = 40 V) COMPARATOR Threshold Voltage TA = 25C TA = Tlow to Thigh Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) MC33063A, MC34063A MC33363AV Input Bias Current (Vin = 0 V) TOTAL DEVICE Supply Current (VCC = 5.0 V to 40 V, CT = 1.0 nF, Pin 7 = VCC, VPin 5 > Vth, Pin 2 = Gnd, remaining pins open) ICC - - 4.0 mA Vth 1.225 1.21 Regline - - IIB - 1.4 1.4 -20 5.0 6.0 -400 nA 1.25 - 1.275 1.29 mV V VCE(sat) VCE(sat) hFE IC(off) - - 50 - 1.0 0.45 75 0.01 1.3 0.7 - 100 V V - A fosc Ichg Idischg Idischg/Ichg Vipk(sense) 24 24 140 5.2 250 33 35 220 6.5 300 42 42 260 7.5 350 kHz A A - mV Symbol Min Typ Max Unit 3. Tlow = 0C for MC34063A, -40C for MC33063A, AV Thigh = +70C for MC34063A, +85C for MC33063A, +125C for MC33063AV 4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. 5. If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents ( 300 mA) and high driver currents ( 30 mA), it may take up to 2.0 s for it to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended: IC output Forced b of output switch : w 10 IC driver - 7.0 mA * * The 100 resistor in the emitter of the driver device requires about 7.0 mA before the output switch conducts. http://onsemi.com 3 MC34063A, MC33063A t on-off , OUTPUT SWITCH ON OFF TIME ( s) 1000 V OSC, OSCILLATOR VOLTAGE (V) 500 200 100 50 20 10 5.0 2.0 1.0 0.01 0.02 toff VCC = 5.0 V Pin 7 = VCC Pin 5 = Gnd TA = 25C ton VCC = 5.0 V Pin 7 = VCC Pin 2 = Gnd Pins 1, 5, 8 = Open CT = 1.0 nF TA = 25C 10 s/DIV 0.05 0.1 0.2 0.5 1.0 2.0 CT, OSCILLATOR TIMING CAPACITOR (nF) 5.0 10 Figure 1. Output Switch On-Off Time versus Oscillator Timing Capacitor 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0 0.2 0.4 VCC = 5.0 V Pins 1, 7, 8 = VCC Pins 3, 5 = Gnd TA = 25C (See Note 6.) 0.6 0.8 1.0 1.2 IE, EMITTER CURRENT (A) 1.4 1.6 VCE(sat), SATURATION VOLTAGE (V) VCE(sat), SATURATION VOLTAGE (V) 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 Figure 2. Timing Capacitor Waveform Darlington Connection VCC = 5.0 V Pin 7 = VCC Pins 2, 3, 5 = Gnd TA = 25C (See Note 6.) Forced = 20 0 0.2 0.4 0.6 0.8 1.0 1.2 IC, COLLECTOR CURRENT(A) 1.4 1.6 Figure 3. Emitter Follower Configuration Output Saturation Voltage versus Emitter Current VIPK(sense), CURRENT LIMIT SENSE VOLTAGE (V) Figure 4. Common Emitter Configuration Output Switch Saturation Voltage versus Collector Current 3.6 400 380 360 340 320 300 280 260 240 220 200 -55 -25 0 25 50 75 TA, AMBIENT TEMPERATURE (C) 100 125 I CC, SUPPLY CURRENT (mA) VCC = 5.0 V Ichg = Idischg 3.2 2.8 2.4 2.0 1.6 1.2 0.8 0.4 0 0 5.0 10 CT = 1.0 nF Pin 7 = VCC Pin 2 = Gnd 15 20 25 30 VCC, SUPPLY VOLTAGE (V) 35 40 Figure 5. Current Limit Sense Voltage versus Temperature Figure 6. Standby Supply Current versus Supply Voltage 6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible. http://onsemi.com 4 200 mV/DIV MC34063A, MC33063A 170 H L 8 180 SQ R 7 Rsc 0.22 Vin 12 V + 6 100 VCC + - 1 Q2 Q1 2 Ipk Osc CT 3 CT 1.25 V Ref Reg 4 R2 1500 pF 1.0 H + Vout 100 1N5819 Comp. 5 R1 2.2 k 47 k 330 + Vout 28 V/175 mA CO Optional Filter Test Line Regulation Load Regulation Output Ripple Efficiency Output Ripple With Optional Filter Conditions Vin = 8.0 V to 16 V, IO = 175 mA Vin = 12 V, IO = 75 mA to 175 mA Vin = 12 V, IO = 175 mA Vin = 12 V, IO = 175 mA Vin = 12 V, IO = 175 mA Results 30 mV = 0.05% 10 mV = 0.017% 400 mVpp 87.7% 40 mVpp Figure 7. Step-Up Converter http://onsemi.com 5 MC34063A, MC33063A 8 1 Vout 8 1 R Vout 7 Rsc Vin 6 2 Rsc Vin 7 2 6 R 0 for constant Vin Figure 8. External Current Boost Connections for IC Peak Greater than 1.5 A 8a. External NPN Switch 8b. External NPN Saturated Switch (See Note 7.) 7. If the output switch is driven into hard saturation (non-Darlington configuration) at low switch currents ( 300 mA) and high driver currents ( 30 mA), it may take up to 2.0 s to come out of saturation. This condition will shorten the off time at frequencies 30 kHz, and is magnified at high temperatures. This condition does not occur with a Darlington configuration, since the output switch cannot saturate. If a non-Darlington configuration is used, the following output drive condition is recommended. http://onsemi.com 6 MC34063A, MC33063A 8 SQ R 7 Rsc 0.33 Vin 25 V 100 6 + VCC + - 1 Q2 Q1 2 Ipk Osc CT 1N5819 3 L CT 470 pF 1.0 H + Vout 100 220 H Comp. 1.25 V Ref Reg 5 R2 R1 1.2 k 3.6 k 4 470 + Vout 5.0 V/500 mA CO Optional Filter Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Conditions Vin = 15 V to 25 V, IO = 500 mA Vin = 25 V, IO = 50 mA to 500 mA Vin = 25 V, IO = 500 mA Vin = 25 V, RL = 0.1 Vin = 25 V, IO = 500 mA Vin = 25 V, IO = 500 mA Results 12 mV = 0.12% 3.0 mV = 0.03% 120 mVpp 1.1 A 83.7% 40 mVpp Figure 9. Step-Down Converter 8 1 1 8 V 7 Rsc Vin 6 2 Vout Rsc Vin 7 2 6 Figure 10. External Current Boost Connections for IC Peak Greater than 1.5 A 10a. External NPN Switch 10b. External PNP Saturated Switch http://onsemi.com 7 MC34063A, MC33063A 8 SQ R 7 Rsc 0.24 Vin 4.5 V to 6.0 V 100 6 + VCC + - 1 Q2 Q1 2 Ipk Osc CT 3 1.25 V Ref Reg 4 R1 Vout -12 V/100 mA 1000 f + CO 1.0 H Vout + 100 + 1500 pF 1N5819 L 88 H Comp. 5 R2 8.2 k 953 Optional Filter Test Line Regulation Load Regulation Output Ripple Short Circuit Current Efficiency Output Ripple With Optional Filter Conditions Vin = 4.5 V to 6.0 V, IO = 100 mA Vin = 5.0 V, IO = 10 mA to 100 mA Vin = 5.0 V, IO = 100 mA Vin = 5.0 V, RL = 0.1 Vin = 5.0 V, IO = 100 mA Vin = 5.0 V, IO = 100 mA Results 3.0 mV = 0.012% 0.022 V = 0.09% 500 mVpp 910 mA 62.2% 70 mVpp Figure 11. Voltage Inverting Converter 8 1 8 1 Vout 7 2 Vout 7 2 Vin 6 Vin 6 Figure 12. External Current Boost Connections for IC Peak Greater than 1.5 A 12a. External NPN Switch 12b. External PNP Saturated Switch http://onsemi.com 8 MC34063A, MC33063A 5.45 2.500 (Top view, copper foil as seen through the board from the component side) MC34063A MC34063A MC34063A (Top View, Component Side) *Optional Filter. Figure 13. Printed Circuit Board and Component Layout (Circuits of Figures 7, 9, 11) INDUCTOR DATA Converter Step-Up Step-Down Voltage-Inverting Inductance (H) 170 220 88 Turns/Wire 38 Turns of #22 AWG 48 Turns of #22 AWG 28 Turns of #22 AWG All inductors are wound on Magnetics Inc. 55117 toroidal core. http://onsemi.com 9 MC34063A, MC33063A Calculation ton/toff Step-Up V out ) V V (ton + toff) toff in(min) * V sat in(min) 1 f t on ) t off ton )1 t off 10-5 F *V Step-Down F * V sat * V out in(min) 1 f t on ) t off ton )1 t off 10-5 V out ) V Voltage-Inverting |V out| ) V V in F * V sat 1 f t on ) t off ton )1 t off V ton CT Ipk(switch) 2I Rsc L(min) (V (ton + toff) - toff 4.0 x ton (ton + toff) - toff 4.0 x 2I ton 2I (ton + toff) - toff 4.0 x 10-5 ton t on )1 t off out(max) t on )1 t off out(max) out(max) 0.3/Ipk(switch) * V sat) in(min) I pk(switch) 9 I outt on V ripple(pp) (V t on(max) in(min) I I 0.3/Ipk(switch) * V sat * V out) pk(switch) (V t on(max) 0.3/Ipk(switch) * V sat) in(min) I pk(switch) 9 I outt on V ripple(pp) t on(max) CO (t )t ) pk(switch) on off 8V ripple(pp) Vsat = Saturation voltage of the output switch. VF = Forward voltage drop of the output rectifier. The following power supply characteristics must be chosen: Vin - Nominal input voltage. Vout - Desired output voltage, |V out| + 1.25 1 ) R2 R1 Iout - Desired output current. fmin - Minimum desired output switching frequency at the selected values of Vin and IO. Vripple(pp) - Desired peak-to-peak output ripple voltage. In practice, the calculated capacitor value will need to be increased due to its equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will directly affect the line and load regulation. NOTE: For further information refer to Application Note AN920A/D and AN954/D. Figure 14. Design Formula Table http://onsemi.com 10 MC34063A, MC33063A ORDERING INFORMATION Device MC33063AD MC33063ADR2 MC33063AP1 MC33063AVD MC33063AVDR2 MC33063AVP MC34063AD MC34063ADR2 MC34063AP1 MC34063BD MC34063BDR2 MC34063AM MC34063AMEL MC34063AML1 MC34063AML2 MC34063AMR1 MC34063AMR2 Package SO-8 SO-8 DIP-8 SO-8 SO-8 DIP-8 SO-8 SO-8 DIP-8 SO-8 SO-8 SOEIAJ-8 SOEIAJ-8 SOEIAJ-8 SOEIAJ-8 SOEIAJ-8 SOEIAJ-8 Shipping 98 Units / Rail 2500 Units / Tape & Reel 50 Units / Rail 98 Units / Rail 2500 Units / Tape & Reel 50 Units / Rail 98 Units / Rail 2500 Units / Tape & Reel 50 Units / Rail 98 Units / Rail 2500 Units / Tape & Reel 94 Units / Rail 1000 Units / Tape & Reel 1000 Units / Tape & Reel 2000 Units / Tape & Reel 1000 Units / Tape & Reel 2000 Units / Tape & Reel MARKING DIAGRAMS PDIP-8 P, P1 SUFFIX CASE 626 8 3x063AP1 AWL YYWW 1 PDIP-8 P, P1 SUFFIX CASE 626 8 33063AVP AWL YYWW 1 1 8 SO-8 D SUFFIX CASE 751 SO-8 D SUFFIX CASE 751 8 8 34063 ALYWz 1 1 SOEIAJ-8 M SUFFIX CASE 968 3x063 ALYWz M063A ALYW x z A WL, L YY, Y WW, W = 3 or 4 = A denotes AD suffix J denotes BD suffix = Assembly Location = Wafer Lot = Year = Work Week http://onsemi.com 11 MC34063A, MC33063A PACKAGE DIMENSIONS PDIP-8 P, P1 SUFFIX PLASTIC PACKAGE CASE 626-05 ISSUE K 8 5 -B- 1 4 F NOTE 2 -A- L NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.60 6.10 4.45 3.94 0.51 0.38 1.78 1.02 2.54 BSC 1.27 0.76 0.30 0.20 3.43 2.92 7.62 BSC 10 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC 10 0.030 0.040 C -T- SEATING PLANE J N D H G 0.13 (0.005) M K T A M M B M SO-8 D SUFFIX PLASTIC PACKAGE CASE 751-06 ISSUE T A 8 D 5 C E H 1 4 0.25 M B M h B C e A SEATING PLANE X 45 _ NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETER. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A A1 B C D E e H h L q MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_ q 0.10 A1 B 0.25 M L CB S A S http://onsemi.com 12 MC34063A, MC33063A SOEIAJ-8 M SUFFIX PLASTIC PACKAGE CASE 968-01 ISSUE O 8 5 LE Q1 E HE M 1 4 L DETAIL P Z D e P A NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER 3. DIMENSION D AND E DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS AND ARE MEASURED AT THE PARTING LINE. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 5. THE LEAD WIDTH DIMENSION (b) DOES NOT INCLUDE DAMBAR PROTUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE LEAD WIDTH DIMENSION AT MAXIMUM MATERIAL CONDITION. DAMBAR CANNOT BE LOCATED ON THE LOWER RADIUS OR THE FOOT MINIMUM SPACE BETWEEN PROTRUSIONS AND ADJACENT LEAD TO BE 0.46 (0.018). DIM A A1 b c D E e HE L LE M Q1 Z MILLIMETERS MIN MAX --2.05 0.05 0.20 0.35 0.50 0.18 0.27 5.10 5.50 5.10 5.45 1.27 BSC 7.40 8.20 0.50 0.85 1.10 1.50 0 10 0.70 0.90 --0.94 INCHES MIN MAX --0.081 0.002 0.008 0.014 0.020 0.007 0.011 0.201 0.217 0.201 0.215 0.050 BSC 0.291 0.323 0.020 0.033 0.043 0.059 0 10 0.028 0.035 --0.037 b 0.13 (0.005) M A1 c 0.10 (0.004) http://onsemi.com 13 MC34063A, MC33063A Notes http://onsemi.com 14 MC34063A, MC33063A Notes http://onsemi.com 15 MC34063A, MC33063A ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. PUBLICATION ORDERING INFORMATION NORTH AMERICA Literature Fulfillment: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: ONlit@hibbertco.com Fax Response Line: 303-675-2167 or 800-344-3810 Toll Free USA/Canada N. American Technical Support: 800-282-9855 Toll Free USA/Canada EUROPE: LDC for ON Semiconductor - European Support German Phone: (+1) 303-308-7140 (Mon-Fri 2:30pm to 7:00pm CET) Email: ONlit-german@hibbertco.com French Phone: (+1) 303-308-7141 (Mon-Fri 2:00pm to 7:00pm CET) Email: ONlit-french@hibbertco.com English Phone: (+1) 303-308-7142 (Mon-Fri 12:00pm to 5:00pm GMT) Email: ONlit@hibbertco.com EUROPEAN TOLL-FREE ACCESS*: 00-800-4422-3781 *Available from Germany, France, Italy, UK, Ireland CENTRAL/SOUTH AMERICA: Spanish Phone: 303-308-7143 (Mon-Fri 8:00am to 5:00pm MST) Email: ONlit-spanish@hibbertco.com ASIA/PACIFIC: LDC for ON Semiconductor - Asia Support Phone: 303-675-2121 (Tue-Fri 9:00am to 1:00pm, Hong Kong Time) Toll Free from Hong Kong & Singapore: 001-800-4422-3781 Email: ONlit-asia@hibbertco.com JAPAN: ON Semiconductor, Japan Customer Focus Center 4-32-1 Nishi-Gotanda, Shinagawa-ku, Tokyo, Japan 141-0031 Phone: 81-3-5740-2745 Email: r14525@onsemi.com ON Semiconductor Website: http://onsemi.com For additional information, please contact your local Sales Representative. http://onsemi.com 16 MC34063A/D |
Price & Availability of MC33063ADR2
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |