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AN026 Datasheet(PDF) 5 Page - Analog Intergrations Corporation |
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AN026 Datasheet(HTML) 5 Page - Analog Intergrations Corporation |
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5 / 7 page  AN026 and 47µF/50V. B. Circuit Structure and Performance Fig. 9 shows the complete charger circuit. During charging, there is a voltage from the ICON pin of AIC1781 to turns the transistor Q3 on. At this while, RREF2 connect to ground, there is a constant current from SEPIC and start fast charging. After fast charging, ICON will deliver a low signal to turns Q3 OFF. At this while, RREF2 is floating and the voltage between RREF1 are equal to each other. Then the voltage flows into FB pin is bigger than the internal reference voltage 1.22V, and terminate charging. It can support a discharge route by SW1, and selectable charge protect functions by SW2~SW5. Fig. 10 is the recommended layout. Fig. 11 and 12 show the current and voltage waveforms during SEPIC turns ON and OFF respectively. VIN 1 VREF 2 SHDN 3 FB 4 GND 5 DLO 6 DHI 7 CL 8 AIC1628 + C4 47 µF + C6 330 µF + C1 330 µF/25V Rlimit 30m Q1 CEM4410 L1 33 µH L2 33 µH D1 1N5820 REF1 33K REF2 3. 3K C2 47nF Vin BAT1 + C3 1 µF + C5 100uF/10V BAT1 R4 RA 430K RB 68K R 100K + C7 4.7 µF C9 47nF C8 0.1 µF Q2 MPS2222A LED1 YELLOW R6 270 R5 200 PEAK 1 VBT 2 DIS 3 VTS 4 VCC 5 ADJ 6 SEL3 7 TMR 8 MODE 9 SEL2 10 SEL1 11 GND 12 LED1 13 LED2 14 ICON 15 DSW 16 AIC1781 R9 680 Ry 551.1K C1 0. 1 µF Rx1 10.1K Q3 MMBT2222A R15 680 R16 680 LED2 GREEN LED3 RED R12 100K R14 100K + C1 C11 0.1 µF R11 200K R13 50K Battery GND N1Battery N2 GND Battery GND SW1 SW PB N4 GND SW2 SW SPDT SW3 SW SPDT SW4 SW SPDT SW5 SW SPDT VOUT 3 VIN 1 GND 2 U2 78L05 Fig. 9 The Complete Charger Circuit (Top Layer) (Bottom Layer) 5 |
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