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L99LD21 Datasheet(PDF) 15 Page - STMicroelectronics |
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L99LD21 Datasheet(HTML) 15 Page - STMicroelectronics |
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15 / 73 page  DS11130 Rev 5 15/73 L99LD21 Boost controller 72 The effective switching frequency is doubled and the ripple cancellation effect results in a reduction of the input and output current ripple. This allows small input and output capacitances. For an operation in dual-phase configuration, FB, COMP and SYNC_I/O pins must be respectively connected together as shown in Figure 5. Figure 5. Pin connections in dual-phase boost controller One of the L99LD21 must be configured as the master and the other device must be configured as the slave (see bit <1> on Table 15: CR#2: Control Register 2). The SYNC_I/O of the master acts as an output, whilst the slave one respectively as an input. The master boost provides a clock signal to the slave, in order to achieve an interleaved switching activity of the slave boost controller, which is 180° out of phase to that of the master. For a proper current balancing between the boost phases, the shunt resistors, which are placed in series to the source of the mosfets, and the inductors, must be identical. |
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