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BM1P061FJ-E2 Datasheet(PDF) 11 Page - Rohm |
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BM1P061FJ-E2 Datasheet(HTML) 11 Page - Rohm |
11 / 30 page 11/26 Datasheet Datasheet BM1P107FJ TSZ02201-0F2F0A200170-1-2 2.Oct.2013.Rev.001 © 2013 ROHM Co., Ltd. All rights reserved. www.rohm.com TSZ22111・15・001 (4) DC/DC driver (PWM comparator, frequency hopping, slope compensation, OSC, burst) (4-1) PWM basic operations Figure 13 shows a PWM basic block diagram and Figure 14 illustrates PWM basic operations. Figure 13. Block Diagram of IC Internal PWM Operations Figure 14. PWM Basic Operations A: A SET signal is output from the oscillator in the IC, and the MOSFET is turned ON. At that time, the capacitance between the MOSFET drain and source becomes discharged, and noise is generated at the CS pin. This noise is called the leading edge. This IC has a built-in filter for this noise. (See (5).) As a result of this filter and delay time, the minimum pulse width of the IC is 400 ns (typ). Afterward, current flow to the MOSFET and the Vcs = Rs * Ip voltage is applied to the CS pin. B: When CS pin voltage rises to become greater than the FB pin voltage/Gain (typ = 4) or the overcurrent detection voltage Vcs, the RESET signal is output and OUT is turned off. C: There is a delay time Tondelay between time point B and actual turn-off. This time is the result of differences in maximum power that occur based on the AC voltage. This IC includes a function that suppresses these differences. (See (4-4).) D: The energy that accumulates in the transformer during Ton status is discharged to the secondary side, and the drain voltage starts to oscillate freely based on the transformer Lp value and the MOSFET Cds (drain-source capacitance). E: Since the switching frequency within the IC is predetermined, SET signal output from the internal oscillator occurs for a set period starting from point A, and the MOSFET is turned on. Ip |
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