Keywords: isolated power, H-bridge drivers, dc-blocking capacitors, isolation capacitors
XC = ½πfC = 1/(2 × 3.14 × 106 × 0.45 × 10-6) 0.35ΩComplementary square-wave drive signals from the IC (ST1 and ST2) are coupled by the isolation capacitors and full-wave rectified by the diodes to produce an isolated output voltage. The high switching frequency also allows use of a small output capacitor. Ignoring switching losses, the output voltage is:
VOUT = VIN - 2VCAP - 2VDIODE, where VCAP = IOUT × XC. Assuming IOUT = 500mAThis circuit suits applications for which the potential difference across the isolation barrier is fixed. (Capacitors provide isolation at dc, but not for ac signals.) With the component values shown and a 500mA load, ripple voltage is about 10% of the dc output level. You can reduce this ripple by increasing the value of the output capacitor. Other circuit performance includes the power-up response with 8Ω (~0.5A) load (Figure 2), the no-load power-up response (Figure 3), and the load-transient response obtained by connecting 8Ω to an unloaded output (Figure 4). (In Figures 2 to 4, Channel 3 is the +5V supply (VCC), and Channel 4 is the voltage across the output capacitor.)
VOUT = 5 - 2(0.5 × 0.35) - 2(0.5) = 5 - 0.35 - 1 3.7V
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APPLICATION NOTE 4553,AN4553, AN 4553, APP4553, Appnote4553, Appnote 4553
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