Contax SW II - REV 4.01 Uživatelský manuál Strana 1

REJ03G1782-0401 Rev.4.01 Page 1 of 27 Jun 17, 2010 Target Specification Datasheet R2J20702NP Peak Current Mode Synchronous Buck Controller wi

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 10 of 27 Jun 17, 2010 Oscillator and Pulse Generator The frequency of oscillation

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 11 of 27 Jun 17, 2010 Application Example Start-up Settings Case 1) Standalone o

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 12 of 27 Jun 17, 2010 Case 3) Retiometric tracking The TRS-SS of channel two is

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 13 of 27 Jun 17, 2010 Case 4) Current sharing or two-phase operation In the case

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 14 of 27 Jun 17, 2010 Output Voltage Setting The error amplifier of the device ha

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 15 of 27 Jun 17, 2010 R2R1VoutAmplifier output: to current-sense comparator50 kΩ5

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 16 of 27 Jun 17, 2010 Equation (3) A0 = ……(3)2 × Nt / RCS × L × Vin × FswSQRT {V

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 17 of 27 Jun 17, 2010 Study of Vout Accuracy The nominal output voltage is calcul

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 18 of 27 Jun 17, 2010 The accuracy of Vout can be estimated by using equation (10

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 19 of 27 Jun 17, 2010 Current Sharing Simply tie the Ishare pins togetherVOUTDevi

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 2 of 27 Jun 17, 2010 Application Circuit Example VINPGNDSWBOOTREG5ON/OFFSYNCIREFC

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 20 of 27 Jun 17, 2010 Current Sharing and Synchronization Tie the Ishare and SYNC

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 21 of 27 Jun 17, 2010 Timing Chart Peak Current Control (EO-Vbe) / 2(Internal sig

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 22 of 27 Jun 17, 2010 Oscillator and Pulse Generator 1. Standalone operation or

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 23 of 27 Jun 17, 2010 2. Operation as a slave chip (simple synchronous operation

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 24 of 27 Jun 17, 2010 Hiccup Operation when the Over-Current Limit (OCL) is Reach

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 25 of 27 Jun 17, 2010 Main Characteristics 6.76.86.97.07.17.27.37.47.57.67.7–50 –

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 26 of 27 Jun 17, 2010 1.451.401.351.301.251.201.151.101.0543044045046047048049050

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 27 of 27 Jun 17, 2010 Package Dimensions yAZELp3.00.0ZDA1cc114151563.00.028294342

Notice1. All information included in this document is current as of the date this document is issued. Such information, however, is subject to change

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 3 of 27 Jun 17, 2010 Block Diagram 50 k50 kActivecurrentsensingSRQQOCP comparator

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 4 of 27 Jun 17, 2010 Pin Arrangement (Top view)FBIshareEOIREFREG5SGNDVCINBOOTSWVI

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 5 of 27 Jun 17, 2010 Pin Description Pin Name Pin No. Description Remarks VIN

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 6 of 27 Jun 17, 2010 Absolute Maximum Ratings (Ta = 25°C) Item Symbol Rating Unit

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 7 of 27 Jun 17, 2010 Electrical Characteristics (Ta = 25°C, VIN = VCIN = 12 V, un

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 8 of 27 Jun 17, 2010 (Ta = 25°C, VIN = VCIN = 12 V, unless otherwise specified) I

R2J20702NP Target Specification REJ03G1782-0401 Rev.4.01 Page 9 of 27 Jun 17, 2010 Description of Operation Peak Current Control The control IC