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LTC4124 Datasheet(PDF) 21 Page - Analog Devices |
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LTC4124 Datasheet(HTML) 21 Page - Analog Devices |
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21 / 30 page  LTC4124 21 Rev. A For more information www.analog.com APPLICATIONS INFORMATION DESIGN EXAMPLE 2: LTC4124 100mA CHARGER RECEIVER WITH LTC4125 AutoResonant® TRANSMITTER Figure 18 shows a complete schematic of a wireless bat- tery charger application showcasing the LTC4124 charg- ing at 100mA. The transmitter circuit uses the LTC4125 AutoResonant Wireless Power Transmitter IC. The LTC4125 drives a series LC network connected to its switch pins at its resonant frequency. The LTC4125 auto resonant drive ensures that the voltage across its SW1 and SW2 pins is always in phase with the current in the transmitter series LC network as shown in Figure 19. The LTC4125 also pulse width modulates the voltage across its SW1 and SW2 pins in order to control the amount of transmit coil current. Figure 20 shows the transmitter LC tank current and voltage waveforms when the drive pulse width results in a duty cycle less than 50%. Figure 18. CTX 33nF x2 RNTCRX FTH PTHM IS– IS+ PTH1 PTH2 EN NTC SW1 SW2 FB LTC4124 4124 F18 RPTHM2 21k RFTH2 100k RFTH1 3.24k 2.2k 680pF DIMON CIMON 10nF 1µF 47µF x 2 RIN 374 RIS 180m IIN 15nF 1nF CFB1 0.1µF DC1 DT2 DT1 RFB1 100k RIMON 100k RFB2 16.5k LTX 6.5µH VIN VIN RPTHM1 100k 4.5V TO 5V 100k RNTCTX VCC VSEL1 VSEL2 ISEL1 ISEL2 PRECHG LBSEL CHRG ACIN DCIN GND BAT NTC DRX CRX 33nF LRX 13µH + AIR GAP 3mm ±1mm LTC4125 IMON CTD CTS GND STAT IN DTH IN1 IN2 LTX: 760308101104 CTX: 2x C2012C0G2A333J125AC CFB1: GRM188R72A104KA35D DC1: CDBQR70 DIMON: ADR510ARTZ DT1: SML-LX0603S1W-TR DT2: BAS521-7 RNTCTX: NTC G064EF104F LRX: 760308101220 CRX: GRM155R71H333KE14D DRX: APG0603VGC RNTCRX: NTC G064EF104F LTC4124 100mA Charger Receiver with LTC4125 AutoResonant Transmitter Figure 19. 4124 F19 VL IL VSW1,SW2 Transmitter Series LC Tank Voltage and Current Waveforms with VSW1,SW2 at 50% Duty Cycle Figure 20. 4124 F20 VL IL VSW1,SW2 Transmitter Series LC Tank Voltage and Current Waveforms with VSW1,SW2 at Less Than 50% Duty Cycle |
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