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L6920DCTR Datasheet(PDF) 7 Page - STMicroelectronics |
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L6920DCTR Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 16 page L6920DC Detailed description 7/16 5 Detailed description The L6920DC is a high efficiency, low voltage step-up DC/DC converter particularly suitable for 1 to 3 cells (Li-Ion/ polymer, NiMH respectively) battery up conversion. These performances are achieved via a strong reduction of quiescent current (10 µA only) and adopting a synchronous rectification that implies also a reduced cost in the application (no external diode required). Operation is based on maximum ON time - minimum OFF time control. A simplified block diagram is shown here below. Figure 5. Simplified block diagram 5.1 Principle of operation In L6920DC the control is based on a comparator that continuously checks the status of output voltage. If the output voltage is lower than the expected value, the control function of the L6920DC directs the energy stored in the inductor to be transferred to the load. This is accomplished by alternating between two basic steps: ● TON phase: the energy is transferred from the battery to the inductor by shorting LX node to ground via the N-channel power switch. The switch is turned off if the current flowing in the inductor reaches the current limit or after a maximum on time set to 5 µs. ● TOFF phase: the energy stored in the inductor is transferred to the load through the synchronous switch for at least a minimum off time equal to 1 µs. After this, the synchronous switch is turned off as soon as the output voltage goes lower than the regulated voltage or the current flowing in the inductor goes down to zero. R Q S Ton max 5 µsec Toff min 1 µsec VBG VBG VBG A B C - + - + - + - + - + VOUT ZERO CROSSING OPAMP (CR) CURRENT LIMIT OUT FB GND VREF LBI LBO D99IN1041 SHDN LX VIN VOUT VOUT GND R1,R2 FB Y Y A B C - + |
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