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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC3552 датащи(PDF) 13 Page - Linear Technology |
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LTC3552 датащи(HTML) 13 Page - Linear Technology |
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13 / 24 page  LTC3552 13 3552f APPLICATIO S I FOR ATIO A typical LTC3552 application circuit is shown in Figure 2. External component selection is driven by the charging requirements and the switching regulators load requirements. Programming Charge Current The charge current is programmed using a single resistor from the PROG pin to ground. The charge current out of the BAT pin is 1000 times the current out of the PROG pin. The program resistor and the charge current are calculated using the following equations: R V I I V R PROG CHG CHG PROG == 1000 1000 , Charge current out of the BAT pin can be determined anytime by monitoring the PROG pin voltage and using the following equation: I V R BAT PROG PROG = • 1000 Programming Charge Termination The charge cycle terminates when the charge current falls below the programmed termination threshold. This thresh- old is set by connecting an external resistor, RTERM, from Figure 2. LTC3552 Basic Application Circuit * Any external sources that hold the ITERM pin above 100mV will prevent the LTC3552 from terminating a charge cycle. ** These equations apply only when the ITERM pin is shorted to the PROG pin. the ITERM pin to ground. The charge termination current threshold (ITERM) is set by the following equation: I V R IR R R TERM TERM CHG PROG TERM TERM == = 100 10 100 •, V V ITERM The termination condition is detected by using an internal filtered comparator to monitor the ITERM pin. When the ITERM pin voltage drops below 100mV* for longer than tTERM (typically 1ms), charging is terminated. The charge current is latched off and the charger enters standby mode where the input supply current drops to 200µA. (Note: Termination is disabled in trickle charging and thermal limiting modes). ITERM can be set to one tenth of ICHG by shorting the ITERM pin to the PROG pin, thus eliminating the need for external resistor RTERM. When configured in this way, ITERM is always set to ICHG/10, and the programmed charge current is set by the equation: I V R R V I CHG PROG PROG CHG == 500 500 , ** VIN 4.5V TO 6.5V VOUT2 2.5V/400mA VOUT1 1.8V/800mA 3552 F02 LTC3552 VIN GND COUT2 4.7 µF CER COUT1 10 µF CER ITERM PROG SW2 RUN1 RUN2 BAT VCC SW1 800mA VFB2 VFB1 CFF2 68pF R4 887k R3 280k CFF1 33pF 4.7 µH 1 µF 10 µF 2.2 µH CHRG PWR EN POR MODE/SYNC 619 Ω 1.24k + 4.2V 1-CELL Li-Ion BATTERY R2 604k R1 301k |
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