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HA16120FP Datasheet(PDF) 8 Page - Renesas Technology Corp |
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HA16120FP Datasheet(HTML) 8 Page - Renesas Technology Corp |
8 / 38 page HA16114P/PJ/FP/FPJ, HA16120FP/FPJ Rev.2.0, Sep.18.2003, page 8 of 37 1.2 External Synchronization These ICs have a sync input pin so that they can be synchronized to a primary-control AC/DC converter. Pulses from the secondary winding of the switching transformer should be dropped through a resistor voltage divider to the sync input pin. Synchronization takes place at the falling edge, which is optimal for multiple-output power supplies that synchronize with a flyback AC/DC converter. The sync input pin ( SYNC) is connected internally through a synchronizing circuit to the sawtooth oscillator to synchronize the sawtooth waveform (see figure 1.2). • Synchronization is with the falling edge of the external sync signal. • The frequency of the external sync signal must be in the range f OSC < fSYNC < fOSC × 2. • The duty cycle of the external sync signal must be in the range 5% < t 1/t2 < 50% (t1 = 300 ns Min). • With external synchronization, V TH' can be calculated as follows. fOSC fSYNC VTH' = (VTH − VTL) × + VTL Note: When not using external synchronization, connect the SYNC pin to the Vref pin. Sawtooth wave (fOSC) SYNC pin (fSYNC) Synchronized at falling edge VTH (1.6 V typ) VTL (1.0 V typ) VTH' Vref 1 V t1 t2 Figure 1.2 External Synchronization |
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